Intertidal Ecology and Life History of Pink Salmon at Olsen Creek, Prince William Sound, Alaska PDF Download
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Author: John H. Helle
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 36
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Book Description
Author: John H. Helle
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 36
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Book Description
Author: Cornelis Groot
Publisher: UBC Press
ISBN: 9780774803595
Category : Nature
Languages : en
Pages : 602
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Book Description
Pacific salmon are an important biological and economic resource of countries of the North Pacific rim. They are also a unique group of fish possessing unusually complex life histories. There are seven species of Pacific salmon, five occurring on both the North American and Asian continents (sockeye, pink, chum, chinook, and coho) and two (masu and amago) only in Asia. The life cycle of the Pacific salmon begins in the autumn when the adult female deposits eggs that are fertilized in gravel beds in rivers or lakes. The young emerge from the gravel the following spring and will either migrate immediately to salt water or spend one or more years in a river or lake before migrating. Migrations in the ocean are extensive during the feeding and growing phase, covering thousands of kilometres. After one or more years the maturing adults find their way back to their home river, returning to their ancestral breeding grounds to spawn. They die after spawning and the eggs in the gravel signify a new cycle. Upon this theme Pacific salmon have developed many variations, both between as well as within species. Pacific Salmon Life Histories provides detailed descriptions of the different life phases through which each of the seven species passes. Each chapter is written by a scientist who has spent years studying and observing a particular species of salmon. Some of the topics covered are geographic distribution, transplants, freshwater life, ocean life, development, growth, feeding, diet, migration, and spawning behaviour. The text is richly supplemented by numerous maps, illustrations, colour plates, and tables and there is a detailed general index, as well as a useful geographical index.
Author: John H. Helle
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 28
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Author: United States. Congress. House. Committee on Merchant Marine and Fisheries
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 396
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Author:
Publisher:
ISBN:
Category : Anadromous fishes
Languages : en
Pages : 264
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Author: R.B. Spies
Publisher: Elsevier
ISBN: 0080469426
Category : Nature
Languages : en
Pages : 608
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Book Description
This comprehensive text is a major synthesis on ecological change in the Gulf of Alaska. It encompasses the structural and annual changes, forces of change, long-ecological changes in the atmosphere and ocean, plankton, fish, birds and mammals, and the effects of the 1989 Exxon Valdez Oil Spill. With 5 major sections, Long-term Ecological Change in the Northern Gulf of Alaska first describes the physical features, the atmosphere and physical oceanography, the annual production cycle, the forage base for higher animals and trophic transfer, and the adaptations for survival in this changing environment for 9 portal species. Then, the major forces of change are introduced: climate, geophysics, fisheries and harvesting, species interactions, disease and contaminants. Next, the long-term records of change in physical factors and biological populations are presented, as well as the potential reasons for the biological changes. Following is the history of the Exxon Valdez oil spill and its long-term effects. And, finally, the emergent properties of the ecosystem are discussed and an attempt is made to weigh the importance of the major forcing factors in terms of their temporal and spatial scales of influence. * Examines important data on long-term change in the ecosystem and the forcing factors that are responsible for it * Provides an account of the 1989 Exxon Valdez oil spill with emphasis on the long-term effects * Describes the effects of climate change, geophysical change, species interactions, harvesting, disease, the 1989 oil spill, and marine contaminants on key populations of marine organisms
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 990
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 498
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Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 614
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Book Description
