Eric Post
- Published in print:
- 2005
- Published Online:
- September 2007
- ISBN:
- 9780198507499
- eISBN:
- 9780191709845
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198507499.003.0015
- Subject:
- Biology, Aquatic Biology
Temporal lags in the response of populations to climatic variation associated with the NAO are widespread in both terrestrial and marine environments. The existence of both immediate and lagged ...
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Temporal lags in the response of populations to climatic variation associated with the NAO are widespread in both terrestrial and marine environments. The existence of both immediate and lagged responses to climate presents conceptual and analytical challenges to the study of the ecological consequences of large-scale climatic variability, as well as to the ability to forecast population responses to future climatic change. This chapter discusses the influence of atmospheric processes, life history, and trophic interactions on time lags. It argues that the existence of time lags in a multitude of systems can be exploited to one obvious advantage: prediction. Hence, an empirically-derived basis for improving conceptual and analytical understanding of lagged responses to climate should prove valuable in the pursuit of scientifically robust predictions of population and community response to future climate changes.Less
Temporal lags in the response of populations to climatic variation associated with the NAO are widespread in both terrestrial and marine environments. The existence of both immediate and lagged responses to climate presents conceptual and analytical challenges to the study of the ecological consequences of large-scale climatic variability, as well as to the ability to forecast population responses to future climatic change. This chapter discusses the influence of atmospheric processes, life history, and trophic interactions on time lags. It argues that the existence of time lags in a multitude of systems can be exploited to one obvious advantage: prediction. Hence, an empirically-derived basis for improving conceptual and analytical understanding of lagged responses to climate should prove valuable in the pursuit of scientifically robust predictions of population and community response to future climate changes.
Tony D. Williams
- Published in print:
- 2012
- Published Online:
- October 2017
- ISBN:
- 9780691139821
- eISBN:
- 9781400842797
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691139821.003.0007
- Subject:
- Biology, Ornithology
This chapter first reviews the evidence for interactions between life-history stages, centering this around reproduction itself: the intention is to put reproduction in the context of the complete ...
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This chapter first reviews the evidence for interactions between life-history stages, centering this around reproduction itself: the intention is to put reproduction in the context of the complete life-cycle. It considers how the wintering and pre-breeding period, including spring migration, can influence reproductive decisions, and in turn how reproductive decisions can influence subsequent post-breeding life stages such as molt, fall migration, and over-winter survival. It looks at the costs of reproduction, simply as a more specific example of general carry-over effects, especially from a mechanistic point of view, with potentially common underlying mechanisms. The chapter argues that short-term energy or nutrient “debts” and resource-allocation trade-offs provide unsatisfactory models for long-term carry-over effects or costs of reproduction; instead, it emphasizes potential “non-resource based” mechanisms.Less
This chapter first reviews the evidence for interactions between life-history stages, centering this around reproduction itself: the intention is to put reproduction in the context of the complete life-cycle. It considers how the wintering and pre-breeding period, including spring migration, can influence reproductive decisions, and in turn how reproductive decisions can influence subsequent post-breeding life stages such as molt, fall migration, and over-winter survival. It looks at the costs of reproduction, simply as a more specific example of general carry-over effects, especially from a mechanistic point of view, with potentially common underlying mechanisms. The chapter argues that short-term energy or nutrient “debts” and resource-allocation trade-offs provide unsatisfactory models for long-term carry-over effects or costs of reproduction; instead, it emphasizes potential “non-resource based” mechanisms.
Eric Post
- Published in print:
- 2013
- Published Online:
- October 2017
- ISBN:
- 9780691148472
- eISBN:
- 9781400846139
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691148472.003.0003
- Subject:
- Biology, Ecology
This chapter looks at examples illustrating patterns in phenological responses to observed and experimental climate change. The most commonly observed phenological response to recent climate change ...
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This chapter looks at examples illustrating patterns in phenological responses to observed and experimental climate change. The most commonly observed phenological response to recent climate change is an advance in the timing of early life history events such as migration, plant emergence or flowering, amphibian breeding, or egg-laying dates in birds. Patterns in satellite-derived images of primary productivity suggest a lengthening of the plant-growing season in recent decades, whereas data on plant phenological dynamics from studies conducted at plot and sublandscape scales indicate shortened phenophases, or phenological events, in response to warming. This contrast may be resolved by recognizing the difference between phenology in the context of individual life history strategies of disparate species and landscape-scale patterns of phenology, and by recognizing the difference between local, species-specific phenological dynamics and those occurring at the landscape scale.Less
This chapter looks at examples illustrating patterns in phenological responses to observed and experimental climate change. The most commonly observed phenological response to recent climate change is an advance in the timing of early life history events such as migration, plant emergence or flowering, amphibian breeding, or egg-laying dates in birds. Patterns in satellite-derived images of primary productivity suggest a lengthening of the plant-growing season in recent decades, whereas data on plant phenological dynamics from studies conducted at plot and sublandscape scales indicate shortened phenophases, or phenological events, in response to warming. This contrast may be resolved by recognizing the difference between phenology in the context of individual life history strategies of disparate species and landscape-scale patterns of phenology, and by recognizing the difference between local, species-specific phenological dynamics and those occurring at the landscape scale.
Michael Power, James D. Reist, and J. Brian Dempson
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199213887
- eISBN:
- 9780191707506
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213887.003.0014
- Subject:
- Biology, Ecology, Aquatic Biology
There is a limited freshwater fish fauna in the high Arctic, with Arctic char (Salvelinus alpinus) dominating in most aquatic systems. In the high Arctic, Arctic char are the only resident freshwater ...
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There is a limited freshwater fish fauna in the high Arctic, with Arctic char (Salvelinus alpinus) dominating in most aquatic systems. In the high Arctic, Arctic char are the only resident freshwater species, which display a complex variety of life-history tactics, varying in growth and feeding patterns to produce ecophenotypes that occupy distinctive niches. Anadromous Arctic char use lake habitats for critical life-history stages, including reproduction, juvenile growth, and over-wintering. Lakes, therefore, provide essential habitat for all Arctic char populations. Atlantic salmon (Salmo salar) also occur in the Arctic, and are an important food source where they occur. Most other species, with the exception of sticklebacks (Gasterosteus aculeatus and Pungitius pungitius), occur only as populations at the northern fringes of their distributional range. While their occurrence can complicate the ecology of any given lake, such species are not an integral part of most high Arctic lake environments.Less
There is a limited freshwater fish fauna in the high Arctic, with Arctic char (Salvelinus alpinus) dominating in most aquatic systems. In the high Arctic, Arctic char are the only resident freshwater species, which display a complex variety of life-history tactics, varying in growth and feeding patterns to produce ecophenotypes that occupy distinctive niches. Anadromous Arctic char use lake habitats for critical life-history stages, including reproduction, juvenile growth, and over-wintering. Lakes, therefore, provide essential habitat for all Arctic char populations. Atlantic salmon (Salmo salar) also occur in the Arctic, and are an important food source where they occur. Most other species, with the exception of sticklebacks (Gasterosteus aculeatus and Pungitius pungitius), occur only as populations at the northern fringes of their distributional range. While their occurrence can complicate the ecology of any given lake, such species are not an integral part of most high Arctic lake environments.
Kevin C. Karnes
- Published in print:
- 2008
- Published Online:
- September 2008
- ISBN:
- 9780195368666
- eISBN:
- 9780199867547
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195368666.003.0002
- Subject:
- Music, History, Western
This chapter offers a substantial reevaluation of Hanslick's work by situating it at the center of late 19th-century debates about the future of the discipline he helped to found. Hired by the ...
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This chapter offers a substantial reevaluation of Hanslick's work by situating it at the center of late 19th-century debates about the future of the discipline he helped to found. Hired by the University of Vienna in 1856 to advance an empiricist movement in art-historical study inspired by the work of the philosopher Johann Friedrich Herbart, Hanslick veered sharply from the Herbartian path within a decade of his appointment. Giving up his attempts to expand his formalist treatise On the Musically Beautiful into a systematic aesthetics in the 1860s, he determined to dedicate himself to the study of cultural history in the post-Hegelian tradition of August Wilhelm Ambros, as evidenced in his second book, History of Concert Life in Vienna (1869). The chapter concludes by arguing that it was Hanslick's abandonment of Herbartianism, rather than his early formalism, that defined his reputation among university colleagues during the final quarter of the century.Less
This chapter offers a substantial reevaluation of Hanslick's work by situating it at the center of late 19th-century debates about the future of the discipline he helped to found. Hired by the University of Vienna in 1856 to advance an empiricist movement in art-historical study inspired by the work of the philosopher Johann Friedrich Herbart, Hanslick veered sharply from the Herbartian path within a decade of his appointment. Giving up his attempts to expand his formalist treatise On the Musically Beautiful into a systematic aesthetics in the 1860s, he determined to dedicate himself to the study of cultural history in the post-Hegelian tradition of August Wilhelm Ambros, as evidenced in his second book, History of Concert Life in Vienna (1869). The chapter concludes by arguing that it was Hanslick's abandonment of Herbartianism, rather than his early formalism, that defined his reputation among university colleagues during the final quarter of the century.
Eric Post
- Published in print:
- 2019
- Published Online:
- May 2019
- ISBN:
- 9780691182353
- eISBN:
- 9780691185491
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691182353.003.0004
- Subject:
- Biology, Ecology
This chapter explores the role of time in ecology as a resource. In this framework, the established terms timing, rate, acceleration, and duration accrue more nuanced importance. Here, timing, rate, ...
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This chapter explores the role of time in ecology as a resource. In this framework, the established terms timing, rate, acceleration, and duration accrue more nuanced importance. Here, timing, rate, and duration refer to the onset of, progression through, and hence use of time in linked series of associated phenophases that comprise an individual organism's life history cycle. As with other resources, time available for allocation to such phenophases or life history stages is limited in supply, and it is in demand by conspecific and heterospecific competitors alike. The chapter then argues that time, much like space, varies in its scales of availability for use by the individual organism, and in its forms available for use by the individual organism.Less
This chapter explores the role of time in ecology as a resource. In this framework, the established terms timing, rate, acceleration, and duration accrue more nuanced importance. Here, timing, rate, and duration refer to the onset of, progression through, and hence use of time in linked series of associated phenophases that comprise an individual organism's life history cycle. As with other resources, time available for allocation to such phenophases or life history stages is limited in supply, and it is in demand by conspecific and heterospecific competitors alike. The chapter then argues that time, much like space, varies in its scales of availability for use by the individual organism, and in its forms available for use by the individual organism.
Graham Bell
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780198569725
- eISBN:
- 9780191717741
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198569725.003.0005
- Subject:
- Biology, Evolutionary Biology / Genetics
The development of multicellular organisms involves a balance between somatic and reproductive tissues. This chapter outlines how the action of selection is influenced by the age at which structures ...
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The development of multicellular organisms involves a balance between somatic and reproductive tissues. This chapter outlines how the action of selection is influenced by the age at which structures and behaviours are expressed. This chapter's first section is called Reproductive allocation and it explains all about the correlated response to selection; antagonism of fitness components; the evolution of genetic correlation; and the optimal allocation. The second section, entitled Life histories, details selection in age-structured populations; depreciation of later reproduction; artificial selection for early reproduction; senescence; soma and germ; the nature of senescence; the evolution of senescence; selection for delayed senescence in Drosophila; endogenous evolution; and the disposable soma.Less
The development of multicellular organisms involves a balance between somatic and reproductive tissues. This chapter outlines how the action of selection is influenced by the age at which structures and behaviours are expressed. This chapter's first section is called Reproductive allocation and it explains all about the correlated response to selection; antagonism of fitness components; the evolution of genetic correlation; and the optimal allocation. The second section, entitled Life histories, details selection in age-structured populations; depreciation of later reproduction; artificial selection for early reproduction; senescence; soma and germ; the nature of senescence; the evolution of senescence; selection for delayed senescence in Drosophila; endogenous evolution; and the disposable soma.
Eric Post
- Published in print:
- 2019
- Published Online:
- May 2019
- ISBN:
- 9780691182353
- eISBN:
- 9780691185491
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691182353.003.0007
- Subject:
- Biology, Ecology
This chapter addresses the role of time in horizontal species interactions. Horizontal, or lateral, species interactions are those involving individuals within a single trophic level in the same ...
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This chapter addresses the role of time in horizontal species interactions. Horizontal, or lateral, species interactions are those involving individuals within a single trophic level in the same local community or species assemblage. These involve primarily interference interactions such as competition for resources required by more than one member of the local assemblage. The chapter then considers the allocation of time within an individual organism's life history cycle. The use of time by the individual must address potentially strongly competing interests. In a competitive context, while earlier timing of life history events may in and of itself present a competitive advantage among conspecifics, its value as a strategy in interspecific competition relates to its effect on phenological duration. This is because duration determines overlap within the phenological community.Less
This chapter addresses the role of time in horizontal species interactions. Horizontal, or lateral, species interactions are those involving individuals within a single trophic level in the same local community or species assemblage. These involve primarily interference interactions such as competition for resources required by more than one member of the local assemblage. The chapter then considers the allocation of time within an individual organism's life history cycle. The use of time by the individual must address potentially strongly competing interests. In a competitive context, while earlier timing of life history events may in and of itself present a competitive advantage among conspecifics, its value as a strategy in interspecific competition relates to its effect on phenological duration. This is because duration determines overlap within the phenological community.
Joshua S. Weitz
- Published in print:
- 2016
- Published Online:
- October 2017
- ISBN:
- 9780691161549
- eISBN:
- 9781400873968
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691161549.003.0002
- Subject:
- Biology, Disease Ecology / Epidemiology
This chapter discusses a number of key commonalities and differences among viral life history traits. Viruses have two key life history stages: inside and outside a host cell. Viral infections of ...
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This chapter discusses a number of key commonalities and differences among viral life history traits. Viruses have two key life history stages: inside and outside a host cell. Viral infections of microbes often lead to the death of host cells and the release of viral progeny. Viral infections can also lead to the integration of viral genomes with those of their hosts; induction of these genomes can result in subsequent lysis and release of viral progeny. Viruses are distinguished not only by the host they infect but also by the quantitative rates and levels at which these interactions take place. Viral life history traits reflect the combined interactions of viruses and hosts; that is, they are not encoded solely by viral genomes. Viral life history traits can also vary by orders of magnitude, whether for time to lysis, burst size, probability of lysogeny, rate of induction, adsorption rate, or mortality rate.Less
This chapter discusses a number of key commonalities and differences among viral life history traits. Viruses have two key life history stages: inside and outside a host cell. Viral infections of microbes often lead to the death of host cells and the release of viral progeny. Viral infections can also lead to the integration of viral genomes with those of their hosts; induction of these genomes can result in subsequent lysis and release of viral progeny. Viruses are distinguished not only by the host they infect but also by the quantitative rates and levels at which these interactions take place. Viral life history traits reflect the combined interactions of viruses and hosts; that is, they are not encoded solely by viral genomes. Viral life history traits can also vary by orders of magnitude, whether for time to lysis, burst size, probability of lysogeny, rate of induction, adsorption rate, or mortality rate.
Frederick Rowe Davis
- Published in print:
- 2007
- Published Online:
- September 2007
- ISBN:
- 9780195310771
- eISBN:
- 9780199790098
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195310771.003.0001
- Subject:
- Biology, Aquatic Biology
Carr's use of narrative to understand nature set him apart from most other scientists. He incorporated local stories and myths in to his technical and popular writings. Everywhere he went in search ...
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Carr's use of narrative to understand nature set him apart from most other scientists. He incorporated local stories and myths in to his technical and popular writings. Everywhere he went in search of nature, Carr found culture, and the humorous and poignant stories of people eking out a living in distant and often desolate places added pathos to the narratives he related in his popular books. Unlike most scientists, Carr readily acknowledged non-expert contributions to his research. Moreover, natural history and ecology, as mastered by Carr, represent narrative exercises. One of Carr's central goals through much of his career was to complete life histories, which is to say the story of life from birth to death, for each of the turtle species of the world. Thus, Carr's use of narrative provides the theoretical tool with which to understand his life and work.Less
Carr's use of narrative to understand nature set him apart from most other scientists. He incorporated local stories and myths in to his technical and popular writings. Everywhere he went in search of nature, Carr found culture, and the humorous and poignant stories of people eking out a living in distant and often desolate places added pathos to the narratives he related in his popular books. Unlike most scientists, Carr readily acknowledged non-expert contributions to his research. Moreover, natural history and ecology, as mastered by Carr, represent narrative exercises. One of Carr's central goals through much of his career was to complete life histories, which is to say the story of life from birth to death, for each of the turtle species of the world. Thus, Carr's use of narrative provides the theoretical tool with which to understand his life and work.
Brad de Young, Francisco E. Werner, Harold Batchelder, François Carlotti, Øyvind Fiksen, Eileen E. Hofmann, Suam Kim, Michio J. Kishi, and Hidekatsu Yamazaki
- Published in print:
- 2010
- Published Online:
- May 2010
- ISBN:
- 9780199558025
- eISBN:
- 9780191721939
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199558025.003.0005
- Subject:
- Biology, Biodiversity / Conservation Biology, Aquatic Biology
GLOBEC studies have greatly expanded our understanding of the structure and functioning of marine ecosystems, in particular demonstrating the importance of life history dynamics in determining the ...
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GLOBEC studies have greatly expanded our understanding of the structure and functioning of marine ecosystems, in particular demonstrating the importance of life history dynamics in determining the influence of physical processes on organisms in the ocean. The linkages between physical and biological processes were explored through novel approaches to experimentation in the laboratory, in the field, and through biophysical models of the coupled dynamics. New observations and the development of realistic physical circulation models have made it possible to quantitatively explore the relation between advection by large‐scale hydrodynamic fields, motions of actively behaving organisms at the scale of the individuals, and the response of organisms to dynamically evolving predator—prey fields. Scale dependence has also been demonstrated through observations that cover a wide geographic range and models that allow high resolution ranging from continental shelf to oceanic basin scales. The complexity of the interactions in marine ecosystems has required consideration of as many factors as possible while at the same time focusing on the primary factors, given the challenges of disentangling the complexity. These ideas and approaches to biophysical coupling are reviewed through presentation of the research that has been carried out during the GLOBEC programme over the past two decades.Less
GLOBEC studies have greatly expanded our understanding of the structure and functioning of marine ecosystems, in particular demonstrating the importance of life history dynamics in determining the influence of physical processes on organisms in the ocean. The linkages between physical and biological processes were explored through novel approaches to experimentation in the laboratory, in the field, and through biophysical models of the coupled dynamics. New observations and the development of realistic physical circulation models have made it possible to quantitatively explore the relation between advection by large‐scale hydrodynamic fields, motions of actively behaving organisms at the scale of the individuals, and the response of organisms to dynamically evolving predator—prey fields. Scale dependence has also been demonstrated through observations that cover a wide geographic range and models that allow high resolution ranging from continental shelf to oceanic basin scales. The complexity of the interactions in marine ecosystems has required consideration of as many factors as possible while at the same time focusing on the primary factors, given the challenges of disentangling the complexity. These ideas and approaches to biophysical coupling are reviewed through presentation of the research that has been carried out during the GLOBEC programme over the past two decades.
Bonnie McElhinny, Valerie Damasco, Shirley Yeung, Angela F. De Ocampo, Monina Febria, Christianne Collantes, and Jason Salonga
- Published in print:
- 2009
- Published Online:
- January 2009
- ISBN:
- 9780195327359
- eISBN:
- 9780199870639
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195327359.003.0006
- Subject:
- Linguistics, Sociolinguistics / Anthropological Linguistics
For many immigrants to Canada, including Filipino Canadian immigrants, a discontinuous narrative about one's professional life is the norm; many immigrants end up working in jobs different than those ...
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For many immigrants to Canada, including Filipino Canadian immigrants, a discontinuous narrative about one's professional life is the norm; many immigrants end up working in jobs different than those for which they were trained in their homeland. In this chapter, we undertake a study of life stories told by Filipino Canadians, with particular attention paid to the ways in which they talk about their work histories, and with particular attention to what constitutes coherence for these speakers. What constitutes ‘continuous’ work experiences, ‘agency', and ‘adequate’ explanations of interest in a particular job are often different for immigrants than for native‐born middle class speakers.Less
For many immigrants to Canada, including Filipino Canadian immigrants, a discontinuous narrative about one's professional life is the norm; many immigrants end up working in jobs different than those for which they were trained in their homeland. In this chapter, we undertake a study of life stories told by Filipino Canadians, with particular attention paid to the ways in which they talk about their work histories, and with particular attention to what constitutes coherence for these speakers. What constitutes ‘continuous’ work experiences, ‘agency', and ‘adequate’ explanations of interest in a particular job are often different for immigrants than for native‐born middle class speakers.
André M. de Roos and Lennart Persson
- Published in print:
- 2013
- Published Online:
- October 2017
- ISBN:
- 9780691137575
- eISBN:
- 9781400845613
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691137575.003.0001
- Subject:
- Biology, Ecology
This chapter provides a summary of the topics covered by the present volume. The summary serves the purpose of clearly showing how different chapters fit together in a general framework with respect ...
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This chapter provides a summary of the topics covered by the present volume. The summary serves the purpose of clearly showing how different chapters fit together in a general framework with respect to model approaches as well as results obtained. Reading this summary chapter will show readers the different types of community modules that will be analyzed as well as provide a clear impression of the results and insights that presented in this book. Topics discussed include biomass overcompensation, ontogenetic (a)symmetry in energetics, emergent community effects of biomass overcompensation, ontogenetic niche shifts in consumer life history, ontogenetic niche shifts in predator life history, competition between consumers with and without ontogenetic niche shifts, and ontogenetic (a)symmetry in energetics and population dynamics.Less
This chapter provides a summary of the topics covered by the present volume. The summary serves the purpose of clearly showing how different chapters fit together in a general framework with respect to model approaches as well as results obtained. Reading this summary chapter will show readers the different types of community modules that will be analyzed as well as provide a clear impression of the results and insights that presented in this book. Topics discussed include biomass overcompensation, ontogenetic (a)symmetry in energetics, emergent community effects of biomass overcompensation, ontogenetic niche shifts in consumer life history, ontogenetic niche shifts in predator life history, competition between consumers with and without ontogenetic niche shifts, and ontogenetic (a)symmetry in energetics and population dynamics.
Tony D. Williams
- Published in print:
- 2012
- Published Online:
- October 2017
- ISBN:
- 9780691139821
- eISBN:
- 9781400842797
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691139821.003.0008
- Subject:
- Biology, Ornithology
This concluding chapter summarizes key themes and identifies four important, overriding concepts that have emerged from this book. First, a common conclusion of many ecological and evolutionary ...
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This concluding chapter summarizes key themes and identifies four important, overriding concepts that have emerged from this book. First, a common conclusion of many ecological and evolutionary studies is that there are intrinsic differences between individuals such that certain high-quality females lay many, large eggs, with a relatively early laying date, rear large broods, and recruit more offspring, while also having higher future fecundity and survival, thus apparently “avoiding” underlying the trade-offs that would predict negative correlations between these traits. Second, most individuals do not reproduce successfully; rather, the majority of individuals do not reproduce at all, while a few individuals contribute a large proportion of the offspring making up the next generation. Third, at the physiological level, different individuals are likely to adopt very flexible, “individually variable” strategies to deal with the costs and benefits of investment in self-maintenance or offspring when faced with increased workload or increased parental effort. Fourth, reproduction needs to be viewed as only one part of an individual's integrated annual cycle and its complete life-history.Less
This concluding chapter summarizes key themes and identifies four important, overriding concepts that have emerged from this book. First, a common conclusion of many ecological and evolutionary studies is that there are intrinsic differences between individuals such that certain high-quality females lay many, large eggs, with a relatively early laying date, rear large broods, and recruit more offspring, while also having higher future fecundity and survival, thus apparently “avoiding” underlying the trade-offs that would predict negative correlations between these traits. Second, most individuals do not reproduce successfully; rather, the majority of individuals do not reproduce at all, while a few individuals contribute a large proportion of the offspring making up the next generation. Third, at the physiological level, different individuals are likely to adopt very flexible, “individually variable” strategies to deal with the costs and benefits of investment in self-maintenance or offspring when faced with increased workload or increased parental effort. Fourth, reproduction needs to be viewed as only one part of an individual's integrated annual cycle and its complete life-history.
Stephen J. Simpson and David Raubenheimer
- Published in print:
- 2012
- Published Online:
- October 2017
- ISBN:
- 9780691145655
- eISBN:
- 9781400842803
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691145655.003.0004
- Subject:
- Biology, Animal Biology
This chapter examines the relationships between nutrition, life span, and sex. It considers the view that dietary restriction without severe malnutrition prolongs life. It is generally believed that ...
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This chapter examines the relationships between nutrition, life span, and sex. It considers the view that dietary restriction without severe malnutrition prolongs life. It is generally believed that the benefits of dietary restriction arise from eating fewer calories. However, Geometric Framework experiments on insects in which the effects of macronutrients have been separated indicate that, rather than calories, a key determinant of the relationship between diet and longevity is the balance of protein to nonprotein (fat and/or carbohydrate) energy in the diet. Meanwhile, the presumption in much of life history theory that life span and reproduction trade off against each other for limiting resources is shown to be too simplistic. These two life-history variables certainly have differing nutritional optima, but they can be dissociated and do not inevitably trade off. Reproductive senescence and aging may proceed at different rates in males and females, as predicted by sexual selection theory.Less
This chapter examines the relationships between nutrition, life span, and sex. It considers the view that dietary restriction without severe malnutrition prolongs life. It is generally believed that the benefits of dietary restriction arise from eating fewer calories. However, Geometric Framework experiments on insects in which the effects of macronutrients have been separated indicate that, rather than calories, a key determinant of the relationship between diet and longevity is the balance of protein to nonprotein (fat and/or carbohydrate) energy in the diet. Meanwhile, the presumption in much of life history theory that life span and reproduction trade off against each other for limiting resources is shown to be too simplistic. These two life-history variables certainly have differing nutritional optima, but they can be dissociated and do not inevitably trade off. Reproductive senescence and aging may proceed at different rates in males and females, as predicted by sexual selection theory.
Tony D. Williams
- Published in print:
- 2012
- Published Online:
- October 2017
- ISBN:
- 9780691139821
- eISBN:
- 9781400842797
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691139821.003.0001
- Subject:
- Biology, Ornithology
This introductory chapter provides an overview of the book's main themes. This book is primarily about physiological mechanisms, but it also addresses the specific question of what we know about the ...
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This introductory chapter provides an overview of the book's main themes. This book is primarily about physiological mechanisms, but it also addresses the specific question of what we know about the physiological, metabolic, energetic, and hormonal mechanisms that regulate, and potentially determine, individual, or phenotypic, variation in key reproductive life-history traits, trade-offs between these traits, and trade-offs and carry-over effects between different life-history stages. Initially, it focuses on the avian reproductive cycle (from seasonal gonadal development, through egg-laying and incubation, to chick-rearing), and then it expands this view to consider reproduction in the broader context of the annual cycle and over an individual's entire lifetime. Throughout the book develops two major themes: that we need to consider reproductive physiology and ecology from a female perspective and that we need to consider the causes and consequences of individual (phenotypic) variation in reproductive life-history traits.Less
This introductory chapter provides an overview of the book's main themes. This book is primarily about physiological mechanisms, but it also addresses the specific question of what we know about the physiological, metabolic, energetic, and hormonal mechanisms that regulate, and potentially determine, individual, or phenotypic, variation in key reproductive life-history traits, trade-offs between these traits, and trade-offs and carry-over effects between different life-history stages. Initially, it focuses on the avian reproductive cycle (from seasonal gonadal development, through egg-laying and incubation, to chick-rearing), and then it expands this view to consider reproduction in the broader context of the annual cycle and over an individual's entire lifetime. Throughout the book develops two major themes: that we need to consider reproductive physiology and ecology from a female perspective and that we need to consider the causes and consequences of individual (phenotypic) variation in reproductive life-history traits.
Michaela Caroline Benson
- Published in print:
- 2011
- Published Online:
- July 2012
- ISBN:
- 9780719082498
- eISBN:
- 9781781701843
- Item type:
- book
- Publisher:
- Manchester University Press
- DOI:
- 10.7228/manchester/9780719082498.001.0001
- Subject:
- Society and Culture, Social Groups
This is a study of how lifestyle choices intersect with migration, and how this relationship frames and shapes post-migration lives. It presents a conceptual framework for understanding ...
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This is a study of how lifestyle choices intersect with migration, and how this relationship frames and shapes post-migration lives. It presents a conceptual framework for understanding post-migration lives that incorporates culturally specific imaginings, lived experiences, individual life histories, and personal circumstances. Through an ethnographic lens incorporating in-depth interviews, participant observation, life and migration histories, this monograph reveals the complex process by which migrants negotiate and make meaningful their lives following migration. By promoting their own ideologies and lifestyle choices relative to those of others, British migrants in rural France reinforce their position as members of the British middle class, but also take authorship of their lives in a way not possible before migration. This is evident in the pursuit of a better life that initially motivated migration and continues to characterise post-migration lives. As the book argues, this ongoing quest is both reflective of wider ideologies about living, particularly the desire for authentic living, and subtle processes of social distinction. In these respects, the book provides an empirical example of the relationship between the pursuit of authenticity and middle-class identification practices.Less
This is a study of how lifestyle choices intersect with migration, and how this relationship frames and shapes post-migration lives. It presents a conceptual framework for understanding post-migration lives that incorporates culturally specific imaginings, lived experiences, individual life histories, and personal circumstances. Through an ethnographic lens incorporating in-depth interviews, participant observation, life and migration histories, this monograph reveals the complex process by which migrants negotiate and make meaningful their lives following migration. By promoting their own ideologies and lifestyle choices relative to those of others, British migrants in rural France reinforce their position as members of the British middle class, but also take authorship of their lives in a way not possible before migration. This is evident in the pursuit of a better life that initially motivated migration and continues to characterise post-migration lives. As the book argues, this ongoing quest is both reflective of wider ideologies about living, particularly the desire for authentic living, and subtle processes of social distinction. In these respects, the book provides an empirical example of the relationship between the pursuit of authenticity and middle-class identification practices.
Linda Herrera
- Published in print:
- 2010
- Published Online:
- September 2010
- ISBN:
- 9780195369212
- eISBN:
- 9780199871179
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195369212.003.0008
- Subject:
- Religion, Religion and Society, Islam
Youth in Egypt and throughout the Muslim Middle East are the most educated and globalized generation in history. Yet they are coming of age in a climate of unemployment, repressive regimes, a youth ...
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Youth in Egypt and throughout the Muslim Middle East are the most educated and globalized generation in history. Yet they are coming of age in a climate of unemployment, repressive regimes, a youth bulge, moral panics about radicalization, and an escalation of regional geopolitical conflicts with no resolution in sight. Despite their centrality to reforms for economic and political development, we tend to know little about youth lives, lifestyles, opinions, and visions for societal change. This chapter uses the life history method to understand the trajectories of young lives and to know from the young themselves about how they relate to politics, the economy, education, and citizenship. Their stories testify that youth may not be so much preoccupied with religious politics as they are with jobs and justice, arguably the defining issues of this youthful generation.Less
Youth in Egypt and throughout the Muslim Middle East are the most educated and globalized generation in history. Yet they are coming of age in a climate of unemployment, repressive regimes, a youth bulge, moral panics about radicalization, and an escalation of regional geopolitical conflicts with no resolution in sight. Despite their centrality to reforms for economic and political development, we tend to know little about youth lives, lifestyles, opinions, and visions for societal change. This chapter uses the life history method to understand the trajectories of young lives and to know from the young themselves about how they relate to politics, the economy, education, and citizenship. Their stories testify that youth may not be so much preoccupied with religious politics as they are with jobs and justice, arguably the defining issues of this youthful generation.
Stephanie Pitts
- Published in print:
- 2012
- Published Online:
- September 2012
- ISBN:
- 9780199838752
- eISBN:
- 9780199950065
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199838752.001.0001
- Subject:
- Music, Psychology of Music
This book considers the aims and impact of formative musical experiences, evaluating the extent to which music education of various kinds provides a foundation for lifelong involvement and interest ...
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This book considers the aims and impact of formative musical experiences, evaluating the extent to which music education of various kinds provides a foundation for lifelong involvement and interest in music. The discussion draws upon rich qualitative data, in which over 100 adults with an active interest in music reflect upon the influences and opportunities that shaped their musical life histories. The book addresses the relationship between the claims made for music education, the practice and policy through which those aims are filtered, and recollections of the lived experiences of learning music in a variety of contexts. This consideration of school music is set in the broader context of learning in the home and community, and illustrates the circumscribed yet immensely powerful role that music teachers and other potential role models can play in nurturing open-minded, active musicians. The four central chapters focus on generational change in home and school experiences of music; the locations in which musical learning takes place, including a cross-cultural comparison with respondents from Italy; the characteristics of teachers, parents and others as musical mentors and role models; and the lifelong outcomes of musical engagement for performers, teachers, listeners and adult learners. This analysis is then used to illuminate the claims made for music education in historical and contemporary debate, and to propose ways in which school music might better prepare young people for lifelong engagement in music. The book takes a long-term perspective on how formative musical experiences and opportunities have a lifelong impact on musical values, skills and attitudes.Less
This book considers the aims and impact of formative musical experiences, evaluating the extent to which music education of various kinds provides a foundation for lifelong involvement and interest in music. The discussion draws upon rich qualitative data, in which over 100 adults with an active interest in music reflect upon the influences and opportunities that shaped their musical life histories. The book addresses the relationship between the claims made for music education, the practice and policy through which those aims are filtered, and recollections of the lived experiences of learning music in a variety of contexts. This consideration of school music is set in the broader context of learning in the home and community, and illustrates the circumscribed yet immensely powerful role that music teachers and other potential role models can play in nurturing open-minded, active musicians. The four central chapters focus on generational change in home and school experiences of music; the locations in which musical learning takes place, including a cross-cultural comparison with respondents from Italy; the characteristics of teachers, parents and others as musical mentors and role models; and the lifelong outcomes of musical engagement for performers, teachers, listeners and adult learners. This analysis is then used to illuminate the claims made for music education in historical and contemporary debate, and to propose ways in which school music might better prepare young people for lifelong engagement in music. The book takes a long-term perspective on how formative musical experiences and opportunities have a lifelong impact on musical values, skills and attitudes.
Cheryl D. Knott, Melissa Emery Thompson, and Serge A. Wich
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780199213276
- eISBN:
- 9780191707568
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213276.003.0011
- Subject:
- Biology, Animal Biology, Biodiversity / Conservation Biology
Orangutans have the longest interbirth interval of any mammal, with existing data suggesting that these intervals may be significantly longer in Sumatra than in Borneo. This finding presents a ...
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Orangutans have the longest interbirth interval of any mammal, with existing data suggesting that these intervals may be significantly longer in Sumatra than in Borneo. This finding presents a paradox because our models of reproductive ecology suggest that the higher habitat quality of Sumatra should lead to shorter interbirth intervals. This chapter explores this intriguing difference between Sumatran and Bornean orangutans by detailing the available evidence on how orangutan reproduction is influenced by ecology and life history. Data are evaluated in light of the models, mechanisms and hypotheses by which energetics influence reproduction in apes and humans. The chapter makes recommendations for future research that will lead to a more thorough understanding of orangutan reproductive ecology. New hypotheses about acute vs cumulative effects of energy on ovarian function, the magnitude of the shift in energy intake, and the role of developmental plasticity in orangutan reproductive functioning are also presented.Less
Orangutans have the longest interbirth interval of any mammal, with existing data suggesting that these intervals may be significantly longer in Sumatra than in Borneo. This finding presents a paradox because our models of reproductive ecology suggest that the higher habitat quality of Sumatra should lead to shorter interbirth intervals. This chapter explores this intriguing difference between Sumatran and Bornean orangutans by detailing the available evidence on how orangutan reproduction is influenced by ecology and life history. Data are evaluated in light of the models, mechanisms and hypotheses by which energetics influence reproduction in apes and humans. The chapter makes recommendations for future research that will lead to a more thorough understanding of orangutan reproductive ecology. New hypotheses about acute vs cumulative effects of energy on ovarian function, the magnitude of the shift in energy intake, and the role of developmental plasticity in orangutan reproductive functioning are also presented.
