Bioenergetic Evaluation of Diel Vertical Migration by Bull Trout PDF Download
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Author: Madeleine Eckmann
Publisher:
ISBN:
Category : Bull trout
Languages : en
Pages : 45
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Book Description
I evaluated hypotheses related to growth as a driver of depth use and diel vertical migration by bull trout (Salvelinus confluentus) in a thermally stratified reservoir. I applied a bioenergetic model to evaluate growth of bull trout in relation to potential patterns of diel depth use by bull trout in Ross Lake, Washington. Modeled patterns of growth were derived from observed vertical distributions of temperature and prey availability. I also observed bull trout depth (and corresponding temperature) use patterns to determine if observed behaviors corresponded with those predicted to maximize growth. Results of this work suggest that bull trout migrations beyond 25 m deep in Ross Lake cannot be explained exclusively by growth and survival alone, two common explanations for diel vertical migration. These deeper excursions may be explained by a third driver that has not been previously emphasized: the importance of colder water for gametogenesis. Further evaluation of this hypothesis as a means of explaining diel vertical migration for bull trout and other fish species in similar environments is warranted.
Author: Madeleine Eckmann
Publisher:
ISBN:
Category : Bull trout
Languages : en
Pages : 45
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Book Description
I evaluated hypotheses related to growth as a driver of depth use and diel vertical migration by bull trout (Salvelinus confluentus) in a thermally stratified reservoir. I applied a bioenergetic model to evaluate growth of bull trout in relation to potential patterns of diel depth use by bull trout in Ross Lake, Washington. Modeled patterns of growth were derived from observed vertical distributions of temperature and prey availability. I also observed bull trout depth (and corresponding temperature) use patterns to determine if observed behaviors corresponded with those predicted to maximize growth. Results of this work suggest that bull trout migrations beyond 25 m deep in Ross Lake cannot be explained exclusively by growth and survival alone, two common explanations for diel vertical migration. These deeper excursions may be explained by a third driver that has not been previously emphasized: the importance of colder water for gametogenesis. Further evaluation of this hypothesis as a means of explaining diel vertical migration for bull trout and other fish species in similar environments is warranted.
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 878
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Book Description
Author:
Publisher:
ISBN:
Category : Aquatic sciences
Languages : en
Pages : 624
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Book Description
Author:
Publisher:
ISBN:
Category : Zoology
Languages : en
Pages : 1072
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Book Description
Author:
Publisher:
ISBN:
Category : Limnology
Languages : en
Pages : 722
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Book Description
Author: Reiner Eckmann
Publisher: Balogh Scientific Books
ISBN:
Category : Science
Languages : en
Pages : 804
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Book Description
Author: Peter B. Moyle
Publisher: Pearson
ISBN:
Category : Nature
Languages : en
Pages : 1582
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Book Description
This book provides a comprehensive and current source of information on fishes--including systematics, zoogeography, behavior, and conservation of fishes--that is often needed by professionals as background for writing accurate reports. This book covers the structure and physiology, evolution and taxonomy, zoogeography, and ecology and conservation of fishes. For fisheries biologists, conservation biologists, and aquatic ecologists that need an up-to-date reference on Ichthyology.
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 2728
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Book Description
Author: Michael James Angilletta
Publisher: Oxford University Press
ISBN: 0198570872
Category : Science
Languages : en
Pages : 304
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Book Description
Temperature impacts the behaviour, physiology and ecology of all organisms more than any other abiotic variable. In this book, the author draws on theory from the more general discipline of evolutionary ecology to foster a fresh approach toward a theory of thermal adaptation.
Author: Bror Jonsson
Publisher: Springer Science & Business Media
ISBN: 9400711891
Category : Science
Languages : en
Pages : 720
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Book Description
Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance. The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species.
