Nutrients in Salmonid Ecosystems PDF Download
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Author: John G. Stockner
Publisher: Bethesda, Md. : American Fisheries Society
ISBN:
Category : Nature
Languages : en
Pages : 312
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Book Description
Author: John G. Stockner
Publisher: Bethesda, Md. : American Fisheries Society
ISBN:
Category : Nature
Languages : en
Pages : 312
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Book Description
Author: American Fisheries Society. Oregon Chapter
Publisher:
ISBN:
Category : Nutrient cycles
Languages : en
Pages : 58
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Book Description
Author: Jan Joel Verspoor
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 178
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Book Description
Spawning Pacific salmon affect freshwater ecosystems through substrate disturbance and the marine-derived nutrient pulse they deliver. I examined relations between a) salmon abundance and stream periphyton after spawning, and b) salmon abundance and invertebrate communities in the spring. I used 24 sockeye salmon (Oncorhynchus nerka) spawning streams in central British Columbia, Canada. After spawning, periphyton was enriched in salmon nitrogen but abundance was negatively related to salmon abundance, likely from substrate disturbance during spawning. Thus nutrient enrichment does not always translate into increased abundance. In the spring, the abundance of grazing mayflies and predatory stoneflies was positively related to salmon abundance, probably from increased algal growth caused by salmon nutrients delivered in previous years. Thus the salmon nutrient pulse can have ecological effects that extend long after spawning. The influence of spawning salmon on freshwater ecosystems differs through the year, across ecosystem components, and in relation to salmon abundance.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Joseph Desmond Kiernan
Publisher:
ISBN:
Category :
Languages : en
Pages : 354
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Book Description
Author: Brittany Syra Graham
Publisher:
ISBN:
Category : Food chains (Ecology)
Languages : en
Pages : 96
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Book Description
Author: Paul Kemp
Publisher: John Wiley & Sons
ISBN: 144434790X
Category : Technology & Engineering
Languages : en
Pages : 328
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Book Description
Salmonid Fisheries is a landmark publication, concentrating on river management, habitat restoration and rehabilitation, disseminating lessons learnt in relation to the intensively studied salmonids that are applicable to future interventions, not just for salmonid species but for other non-salmonid species, biota and ecosystems. The contents of this book are the product of the Atlantic Salmon Trust’s 40th Anniversary Conference, held in association with the Game and Wildlife Conservation Trust. Drawing together carefully-edited contributions from many of the world leaders in river restoration from academia, commercial management and government agencies, this important book highlights the need to view river management from the context of the catchment and to adopt an ecosystem-based approach to restoration. The book is broadly divided into two sections which discuss first, the status of current understanding concerning the relationship between lotic habitat management, the response of salmonid fisheries and the theory of river restoration, and secondly, the application of this to habitat management and river restoration. Salmonid Fisheries is an extremely valuable work of reference for fisheries managers, ecologists, environmental scientists, fish biologists, conservation biologists and geomorphologists. Libraries in all universities and research establishments where biological and earth sciences, and fisheries management are studied or taught should have copies of this book on their shelves. Contributions from a wide range of well known experts Published in association with the Atlantic Salmon Trust Habitat management is crucial for dwindling wild salmon populations Of great importance to aquatic ecologists and fisheries managers
Author: Daniel L. Bottom
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 396
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Book Description
Author: Patrizio Lacopo
Publisher:
ISBN: 9781607412878
Category : Nature
Languages : en
Pages : 0
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Book Description
Pacific salmon are among the dominant fish groups and the main consumers of forage resources in the upper layer of the subarctic Pacific. In the last years, the majority of Pacific salmon species in North America and in Asia have experienced an increase in abundance, and their role in marine ecosystem has changed. This book examines the feeding habits and trophic status of the Pacific salmon in different regions of the subarctic Pacific under the influence of changing environmental factors. Moreover, this book deals with the present-day Norwegian regulations of saltwater salmon fisheries and particularly Norway's attempts to harmonise the interests of people and fish. Polycyclic aromatic hydrocarbons (PAH) constitute carcinogenic environmental contaminants such as dioxins. Fishes and particularly Salmonids are very sensitive to the PAH toxicity. The natural and anthropogenic PAH generations lead to an environmental contamination of water, sediments and feed of Salmonids, then to a fish contamination and finally to a human food contamination eating those contaminated fishes. The authors of this book discuss the monitoring of these chemical contaminants in salmon, essential to evaluate the pollution related to human activities and to guarantee the quality of fish as food for human consumption. In addition, the effects of replacing fish oil (FO) with rapeseed oil (RO) in Atlantic salmon post-smolt diets is discussed, and its subsequent effects on liver and muscle fatty acid (FA) composition and growth are described. This book also describes the high-pressure processing of fresh salmon and light preserved products like cold smoked salmon. Its effect on microorganisms, enzymes and organoleptic properties are analysed, as well as the process parameters, pressure, duration, and temperature affecting microorganisms, structure and colour, which all determine the market chances of the product. Moreover, the authors underline the influence of three main factors -- super-chilling, dietary lipids and pre-slaughter crowding stress, on Atlantic salmon flesh quality, with a focus on the role of lysosomes and lysosomal enzymes, cathepsins B and L, in muscle structure degradation and flesh quality.
Author: Deanna J. Stouder
Publisher: Springer Science & Business Media
ISBN: 1461563755
Category : Science
Languages : en
Pages : 681
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Book Description
The symposium "Pacific Salmon and Their Ecosystems: Status and Future Options',' and this book resulted from initial efforts in 1992 by Robert J. Naiman and Deanna J. Stouder to examine the problem of declining Pacific salmon (Oncorhynchus spp.). Our primary goal was to determine informational gaps. As we explored different scientific sources, state, provincial, and federal agencies, as well as non-profit and fishing organizations, we found that the information existed but was not being communicated across institutional and organizational boundaries. At this juncture, we decided to create a steering committee and plan a symposium to bring together researchers, managers, and resource users. The steering committee consisted of members from state and federal agencies, non-profit organizations, and private industry (see Acknowledgments for names and affiliations). In February 1993, we met at the University of Washington in Seattle to begin planning the symposium. The steering committee spent the next four months developing the conceptual framework for the symposium and the subsequent book. Our objectives were to accomplish the following: (1) assess changes in anadromous Pacific Northwest salmonid populations, (2) examine factors responsible for those changes, and (3) identify options available to society to restore Pacific salmon in the Northwest. The symposium on Pacific Salmon was held in Seattle, Washington, January 10-12, 1994. Four hundred and thirty-five people listened to oral presentations and examined more than forty posters over two and a half days. We made a deliberate attempt to draw in speakers and attendees from outside the Pacific Northwest.
