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/9780195310771.003.0009
- Subject:
- Biology, Aquatic Biology
Carr spent more than thirty years dedicated to the study of the ecology and migration of sea turtles. Many of the stories he had heard from the turtle captains had been confirmed through tag returns ...
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Carr spent more than thirty years dedicated to the study of the ecology and migration of sea turtles. Many of the stories he had heard from the turtle captains had been confirmed through tag returns from all over the Caribbean. The riddle of the ridley had been solved and documented by an old, grainy film, but it virtually disappeared during the 1960s. Carr's research extended beyond Tortuguero and the Caribbean to include Ascension Island, and he collaborated with other scientists to produce ambitious theories regarding olfaction, vision, and the role of seafloor spreading. Carr and his students participated in the Western Atlantic Turtle Symposium, an event that suggested growing interest in the ecology and conservation of sea turtles. Nevertheless, questions still remained. Sargassum mats had initially seemed promising as a refuge for sea turtles during their lost year, but oceanic zones of convergence (including sargassum) seemed to be a more promising explanation.Less
Carr spent more than thirty years dedicated to the study of the ecology and migration of sea turtles. Many of the stories he had heard from the turtle captains had been confirmed through tag returns from all over the Caribbean. The riddle of the ridley had been solved and documented by an old, grainy film, but it virtually disappeared during the 1960s. Carr's research extended beyond Tortuguero and the Caribbean to include Ascension Island, and he collaborated with other scientists to produce ambitious theories regarding olfaction, vision, and the role of seafloor spreading. Carr and his students participated in the Western Atlantic Turtle Symposium, an event that suggested growing interest in the ecology and conservation of sea turtles. Nevertheless, questions still remained. Sargassum mats had initially seemed promising as a refuge for sea turtles during their lost year, but oceanic zones of convergence (including sargassum) seemed to be a more promising explanation.
David R. Schiel and Michael S. Foster
- Published in print:
- 2015
- Published Online:
- January 2016
- ISBN:
- 9780520278868
- eISBN:
- 9780520961098
- Item type:
- book
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520278868.001.0001
- Subject:
- Biology, Ecology
The largest seaweed, giant kelp (Macrocystis) is the fastest growing and most prolific of all plants found on earth. Growing from the seafloor and extending along the ocean surface in lush canopies, ...
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The largest seaweed, giant kelp (Macrocystis) is the fastest growing and most prolific of all plants found on earth. Growing from the seafloor and extending along the ocean surface in lush canopies, giant kelp provides an extensive vertical habitat in a largely two-dimensional seascape. It is the foundation for one of the most species-rich, productive, and widely distributed ecological communities in the world. This review takes the reader from Darwin's early observations to contemporary research, providing a historical perspective for the modern understanding of giant kelp evolution, biogeography, biology, and physiology. The chapters furnish a discussion of kelp species and forest ecology worldwide, with considerations of human uses and abuses, management and conservation, and the current and likely future impacts of global change.Less
The largest seaweed, giant kelp (Macrocystis) is the fastest growing and most prolific of all plants found on earth. Growing from the seafloor and extending along the ocean surface in lush canopies, giant kelp provides an extensive vertical habitat in a largely two-dimensional seascape. It is the foundation for one of the most species-rich, productive, and widely distributed ecological communities in the world. This review takes the reader from Darwin's early observations to contemporary research, providing a historical perspective for the modern understanding of giant kelp evolution, biogeography, biology, and physiology. The chapters furnish a discussion of kelp species and forest ecology worldwide, with considerations of human uses and abuses, management and conservation, and the current and likely future impacts of global change.
James Lawrence Powell
- Published in print:
- 2014
- Published Online:
- November 2015
- ISBN:
- 9780231164481
- eISBN:
- 9780231538459
- Item type:
- chapter
- Publisher:
- Columbia University Press
- DOI:
- 10.7312/columbia/9780231164481.003.0017
- Subject:
- Environmental Science, Environmental Studies
This chapter discusses paleomagnetic research that focused on spreading seafloors and their relevance to continental drift. By 1964, paleomagnetic research was already shifting direction. No longer ...
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This chapter discusses paleomagnetic research that focused on spreading seafloors and their relevance to continental drift. By 1964, paleomagnetic research was already shifting direction. No longer would the emphasis be on determining past pole positions; now the research swung to using the magnetic reversals to date rocks. To everyone's surprise, including the scientists involved, it would turn out to be the reversals that would ultimately corroborate continental drift. But first the paleomagnetists had to convince themselves that the reversals reflected actual changes in the Earth's magnetic field rather than being attributable to self-reversal or some other unknown process. The way to find out was to determine whether rocks of the same age from different locations all had the same magnetic polarity: normal or reversed. Basalts are the most strongly magnetized rocks, and by the early 1960s, geologists had learned how to measure their ages using the decay of potassium to argon. This chapter also considers Harry Hess's theory of seafloor spreading as well as the work of Robert Sinclair Dietz.Less
This chapter discusses paleomagnetic research that focused on spreading seafloors and their relevance to continental drift. By 1964, paleomagnetic research was already shifting direction. No longer would the emphasis be on determining past pole positions; now the research swung to using the magnetic reversals to date rocks. To everyone's surprise, including the scientists involved, it would turn out to be the reversals that would ultimately corroborate continental drift. But first the paleomagnetists had to convince themselves that the reversals reflected actual changes in the Earth's magnetic field rather than being attributable to self-reversal or some other unknown process. The way to find out was to determine whether rocks of the same age from different locations all had the same magnetic polarity: normal or reversed. Basalts are the most strongly magnetized rocks, and by the early 1960s, geologists had learned how to measure their ages using the decay of potassium to argon. This chapter also considers Harry Hess's theory of seafloor spreading as well as the work of Robert Sinclair Dietz.
James Lawrence Powell
- Published in print:
- 2014
- Published Online:
- November 2015
- ISBN:
- 9780231164481
- eISBN:
- 9780231538459
- Item type:
- chapter
- Publisher:
- Columbia University Press
- DOI:
- 10.7312/columbia/9780231164481.003.0018
- Subject:
- Environmental Science, Environmental Studies
This chapter discusses the influence of Harry Hess's theory of seafloor spreading on other scientists who were studying continental drift. Fred Vine, inspired by Hess's talk at Cambridge in January ...
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This chapter discusses the influence of Harry Hess's theory of seafloor spreading on other scientists who were studying continental drift. Fred Vine, inspired by Hess's talk at Cambridge in January 1962, titled his student address to the Cambridge Geology Club “HypotHESSes.” In the early 1960s, it was a rare geologist who knew and accepted both that the Earth's magnetic field had reversed and that the seafloors were spreading from the ridges. Vine set to work interpreting Drummond Matthews' magnetic data from the Carlsberg Ridge, focusing on two puzzling underwater volcanic seamounts. He then wrote up a short paper and submitted it to Nature, which published “Magnetic Anomalies Over Ocean Ridges” on September 7, 1963. Vine also collaborated with the Canadian geologist Tuzo Wilson to study the magnetic patterns on either side of the Juan de Fuca Ridge off Vancouver Island in the Pacific Northwest. This chapter also considers the work of Allan Cox, Brent Dalrymple, and Richard Doell dating and measuring the magnetic polarity of volcanic rocks of different ages.Less
This chapter discusses the influence of Harry Hess's theory of seafloor spreading on other scientists who were studying continental drift. Fred Vine, inspired by Hess's talk at Cambridge in January 1962, titled his student address to the Cambridge Geology Club “HypotHESSes.” In the early 1960s, it was a rare geologist who knew and accepted both that the Earth's magnetic field had reversed and that the seafloors were spreading from the ridges. Vine set to work interpreting Drummond Matthews' magnetic data from the Carlsberg Ridge, focusing on two puzzling underwater volcanic seamounts. He then wrote up a short paper and submitted it to Nature, which published “Magnetic Anomalies Over Ocean Ridges” on September 7, 1963. Vine also collaborated with the Canadian geologist Tuzo Wilson to study the magnetic patterns on either side of the Juan de Fuca Ridge off Vancouver Island in the Pacific Northwest. This chapter also considers the work of Allan Cox, Brent Dalrymple, and Richard Doell dating and measuring the magnetic polarity of volcanic rocks of different ages.
Wolf H. Berger
- Published in print:
- 2009
- Published Online:
- March 2012
- ISBN:
- 9780520247789
- eISBN:
- 9780520942547
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520247789.003.0013
- Subject:
- Biology, Aquatic Biology
This chapter explains the concepts of continental drift, seafloor spreading, plate tectonics, and mantle convection to address the origin of the most striking features of the Earth’s surface. These ...
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This chapter explains the concepts of continental drift, seafloor spreading, plate tectonics, and mantle convection to address the origin of the most striking features of the Earth’s surface. These include land areas and ocean regions, mountain ranges such as volcanic and nonvolcanic mountains, deep trenches, and sunken islands in the Pacific region.Less
This chapter explains the concepts of continental drift, seafloor spreading, plate tectonics, and mantle convection to address the origin of the most striking features of the Earth’s surface. These include land areas and ocean regions, mountain ranges such as volcanic and nonvolcanic mountains, deep trenches, and sunken islands in the Pacific region.
MILTON S. LOVE and MARY M. YOKLAVICH
- Published in print:
- 2006
- Published Online:
- March 2012
- ISBN:
- 9780520246539
- eISBN:
- 9780520932470
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520246539.003.0010
- Subject:
- Biology, Aquatic Biology
This chapter discusses those fishes characteristically found on or over complex seafloor habitats comprising various amounts of cobble, boulders, and rock outcrops in water depths ranging from 30 to ...
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This chapter discusses those fishes characteristically found on or over complex seafloor habitats comprising various amounts of cobble, boulders, and rock outcrops in water depths ranging from 30 to 500 m. This depth range encompasses the continental shelf and upper continental slope of California. This chapter also discusses those fishes associated with such artificial structures as oil platforms off Southern California at similar depths. Because very little is known of fish assemblages associated with deep rock habitats off Baja California, this chapter limits the discussion to California waters.Less
This chapter discusses those fishes characteristically found on or over complex seafloor habitats comprising various amounts of cobble, boulders, and rock outcrops in water depths ranging from 30 to 500 m. This depth range encompasses the continental shelf and upper continental slope of California. This chapter also discusses those fishes associated with such artificial structures as oil platforms off Southern California at similar depths. Because very little is known of fish assemblages associated with deep rock habitats off Baja California, this chapter limits the discussion to California waters.
MARGARET A. NEIGHBORS and RAYMOND R. WILSON
- Published in print:
- 2006
- Published Online:
- March 2012
- ISBN:
- 9780520246539
- eISBN:
- 9780520932470
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520246539.003.0013
- Subject:
- Biology, Aquatic Biology
Below the euphotic epipelagic zone is the realm of deep-sea fishes. The depth zones of this major portion of the earth's oceans have been characterized by the physical features and types of organisms ...
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Below the euphotic epipelagic zone is the realm of deep-sea fishes. The depth zones of this major portion of the earth's oceans have been characterized by the physical features and types of organisms present. Many deep-sea fishes are bioluminescent, even though light production would seem to make them stand out in their dark world. The photophores of many mesopelagic and bathypelagic fishes are, however, arranged in rows along the ventral surface of the animal. These are thought to provide counterillumination by producing light that is similar to the ambient light in color, intensity, and angular dispersion. Near the seafloor of even the world's deepest oceans, one finds that the fishes are typically much larger, more substantial, and usually more active than those of the overlying midwaters. This chapter also presents general differences in the characteristics of fishes from the epipelagic through the benthopelagic regions of the open ocean.Less
Below the euphotic epipelagic zone is the realm of deep-sea fishes. The depth zones of this major portion of the earth's oceans have been characterized by the physical features and types of organisms present. Many deep-sea fishes are bioluminescent, even though light production would seem to make them stand out in their dark world. The photophores of many mesopelagic and bathypelagic fishes are, however, arranged in rows along the ventral surface of the animal. These are thought to provide counterillumination by producing light that is similar to the ambient light in color, intensity, and angular dispersion. Near the seafloor of even the world's deepest oceans, one finds that the fishes are typically much larger, more substantial, and usually more active than those of the overlying midwaters. This chapter also presents general differences in the characteristics of fishes from the epipelagic through the benthopelagic regions of the open ocean.
Wolf H. Berger
- Published in print:
- 2009
- Published Online:
- March 2012
- ISBN:
- 9780520247789
- eISBN:
- 9780520942547
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520247789.003.0003
- Subject:
- Biology, Aquatic Biology
This chapter discusses the major features of the ocean and its natural history. It begins with a brief discussion on the topography of the sea surface and explains how ocean basins are produced by ...
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This chapter discusses the major features of the ocean and its natural history. It begins with a brief discussion on the topography of the sea surface and explains how ocean basins are produced by seafloor spreading. The chapter then discusses patterns of sea-surface currents, wind strengths, generation of waves, and how basins exchange water. It also considers nutrient fertilization, ocean productivity, and the diversity of life in the sea.Less
This chapter discusses the major features of the ocean and its natural history. It begins with a brief discussion on the topography of the sea surface and explains how ocean basins are produced by seafloor spreading. The chapter then discusses patterns of sea-surface currents, wind strengths, generation of waves, and how basins exchange water. It also considers nutrient fertilization, ocean productivity, and the diversity of life in the sea.
James Lawrence Powell
- Published in print:
- 2014
- Published Online:
- November 2015
- ISBN:
- 9780231164481
- eISBN:
- 9780231538459
- Item type:
- chapter
- Publisher:
- Columbia University Press
- DOI:
- 10.7312/columbia/9780231164481.003.0014
- Subject:
- Environmental Science, Environmental Studies
This chapter discusses some of the surprising ideas on continental drift that emerged after World War II. In 1965, a young Princeton postdoctoral student named W. Jason Morgan had been poring over ...
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This chapter discusses some of the surprising ideas on continental drift that emerged after World War II. In 1965, a young Princeton postdoctoral student named W. Jason Morgan had been poring over photographs of the Moon, seeing what he could deduce from the heights of the walls and central peaks of lunar craters. Before long he had switched his interest from the faraway Moon to the inaccessible deep-sea trenches. Morgan began to explore Arthur Holmes's idea that a pair of descending convection cells might drag down the crust and create the great deeps. This chapter also takes a look at the map created by Bruce Heezen, Marie Tharp, and Maurice Ewing depicting the the seafloor of the Atlantic Ocean, along with research that provided rigorous quantitative evidence relevant to continental drift.Less
This chapter discusses some of the surprising ideas on continental drift that emerged after World War II. In 1965, a young Princeton postdoctoral student named W. Jason Morgan had been poring over photographs of the Moon, seeing what he could deduce from the heights of the walls and central peaks of lunar craters. Before long he had switched his interest from the faraway Moon to the inaccessible deep-sea trenches. Morgan began to explore Arthur Holmes's idea that a pair of descending convection cells might drag down the crust and create the great deeps. This chapter also takes a look at the map created by Bruce Heezen, Marie Tharp, and Maurice Ewing depicting the the seafloor of the Atlantic Ocean, along with research that provided rigorous quantitative evidence relevant to continental drift.
James Lawrence Powell
- Published in print:
- 2014
- Published Online:
- November 2015
- ISBN:
- 9780231164481
- eISBN:
- 9780231538459
- Item type:
- chapter
- Publisher:
- Columbia University Press
- DOI:
- 10.7312/columbia/9780231164481.003.0019
- Subject:
- Environmental Science, Environmental Studies
This chapter focuses on what turns out to be the discovery of the twentieth century: the key insight that turned seafloor spreading and continental drift into plate tectonics. In his 1965 article on ...
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This chapter focuses on what turns out to be the discovery of the twentieth century: the key insight that turned seafloor spreading and continental drift into plate tectonics. In his 1965 article on transform faults, Tuzo Wilson wrote: “Movements of the Earth's crust are concentrated in mobile belts, which may take the form of mountains, mid-ocean ridges or major faults with large horizontal movements. The plates between the mobile belts are not readily deformed except at their edges.” Just as Wilson had noticed that earthquakes along the Mid-Atlantic Ridge's fracture zones “end abruptly” and do not extend beyond the ridge crest, Jason Morgan published a 1968 paper, “Rises, Trenches, Great Faults, and Crustal Blocks,” that captures the essence of plate tectonics. This chapter also considers the work of other scientists such as Lamonter Xavier Le Pichon, Tanya Atwater, John Dewey, and F. M. Bird to explain the correlation between plate tectonics and the large-scale features of continental geology.Less
This chapter focuses on what turns out to be the discovery of the twentieth century: the key insight that turned seafloor spreading and continental drift into plate tectonics. In his 1965 article on transform faults, Tuzo Wilson wrote: “Movements of the Earth's crust are concentrated in mobile belts, which may take the form of mountains, mid-ocean ridges or major faults with large horizontal movements. The plates between the mobile belts are not readily deformed except at their edges.” Just as Wilson had noticed that earthquakes along the Mid-Atlantic Ridge's fracture zones “end abruptly” and do not extend beyond the ridge crest, Jason Morgan published a 1968 paper, “Rises, Trenches, Great Faults, and Crustal Blocks,” that captures the essence of plate tectonics. This chapter also considers the work of other scientists such as Lamonter Xavier Le Pichon, Tanya Atwater, John Dewey, and F. M. Bird to explain the correlation between plate tectonics and the large-scale features of continental geology.
Simon F. Thrush and Andrew M. Lohrer
- Published in print:
- 2012
- Published Online:
- December 2013
- ISBN:
- 9780199642250
- eISBN:
- 9780191774768
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199642250.003.0014
- Subject:
- Biology, Aquatic Biology
This chapter examines how observational studies can help in the design, execution, and interpretation of biodiversity-ecosystem function relationships. It first analyses the heterogeneous nature of ...
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This chapter examines how observational studies can help in the design, execution, and interpretation of biodiversity-ecosystem function relationships. It first analyses the heterogeneous nature of seafloor landscapes and how interactions between processes occurring on different temporal and spatial scales give rise to complex and interesting dynamics that characterise many benthic marine ecosystems. It then explores the role of observations in studying ecosystem functioning, assesses the relevance of scaling laws to BEF, and considers a more integrative approach to empirical research in BEF studies.Less
This chapter examines how observational studies can help in the design, execution, and interpretation of biodiversity-ecosystem function relationships. It first analyses the heterogeneous nature of seafloor landscapes and how interactions between processes occurring on different temporal and spatial scales give rise to complex and interesting dynamics that characterise many benthic marine ecosystems. It then explores the role of observations in studying ecosystem functioning, assesses the relevance of scaling laws to BEF, and considers a more integrative approach to empirical research in BEF studies.
John A. Adam
- Published in print:
- 2017
- Published Online:
- May 2018
- ISBN:
- 9780691148373
- eISBN:
- 9781400885404
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691148373.003.0013
- Subject:
- Mathematics, Applied Mathematics
This chapter describes a mathematical model of tsunami propagation (transient waves). A tsunami is a series of ocean waves triggered by large-scale disturbances of the ocean, including earthquakes, ...
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This chapter describes a mathematical model of tsunami propagation (transient waves). A tsunami is a series of ocean waves triggered by large-scale disturbances of the ocean, including earthquakes, as well as landslides, volcanic eruptions, and meteorites. Tsunamis have very long wavelengths (typically hundreds of kilometers). They have also been called “tidal waves” or “seismic sea waves,” but both terms are misleading. The chapter first considers the boundary-value problem before modeling two special cases of tsunami generation, one due to an initial displacement on the free surface and the other due to tilting of the seafloor. It also discusses surface waves on deep water and how fast the wave energy propagates and concludes with an analysis of leading waves due to a transient disturbance.Less
This chapter describes a mathematical model of tsunami propagation (transient waves). A tsunami is a series of ocean waves triggered by large-scale disturbances of the ocean, including earthquakes, as well as landslides, volcanic eruptions, and meteorites. Tsunamis have very long wavelengths (typically hundreds of kilometers). They have also been called “tidal waves” or “seismic sea waves,” but both terms are misleading. The chapter first considers the boundary-value problem before modeling two special cases of tsunami generation, one due to an initial displacement on the free surface and the other due to tilting of the seafloor. It also discusses surface waves on deep water and how fast the wave energy propagates and concludes with an analysis of leading waves due to a transient disturbance.
