Author: Stephen C. Riley
Publisher:
ISBN:
Category : Trout
Languages : en
Pages : 398
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Book Description
In 1987, we initiated a replicated field experiment designed to examine the effects of log-drop structures on trout populations in six small Rocky Mountain streams. Log-drop structures were installed in 250-m treatment sections in 1988 and results were compared to adjacent 250-m control sections during 1987-1990. Marked changes in habitat variables resulted from the installation of log-drop structures, including increased pool volume, depth, and cover, and decreased current velocity. We found significant increases in abundance of age-2+ and older trout in all six streams, and often age-1+ trout also, after structures were installed. Increases in abundance were fairly consistent for age-2+ and older trout, but were more variable across streams for age-1+ fish. There is little evidence to suggest that trout grew faster or to larger sizes in treatment sections after structures were installed. Results also suggest that the structures did not result in increased survival of resident trout. Low recapture rates of marked trout and high percentages of unmarked adult fish suggest that movement was common in these streams, which is contrary to much research on stream-resident trout. More unmarked trout were captured in treatment than control sections. Therefore, movement may be an important mechanism to account for the increase in trout abundance and biomass in sections where logs were installed. Evaluation of our population estimates indicates that we capture the majority of the fish in our sections, and there is no evidence to indicate that the population estimates are more biased in the treatment sections. Angling pressure was low on all streams, and few anglers killed fish. A review of the literature on salmonid habitat use reveals that studies primarily focus on correlations between habitat and standing crop or fish positions, rather than on the mechanisms that cause habitat selection. There are a number of areas, including the role of trout movement, in which our understanding is lacking, and we lack a coherent conceptual framework for investigations of salmonid habitat use. Field experiments designed to illuminate the mechanisms driving salmonid habitat use are necessary before the effects of habitat manipulation can be predicted.
Author: Charles Gowan
Publisher:
ISBN:
Category : Fish habitat improvement
Languages : en
Pages : 262
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Book Description
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 948
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Book Description
Author: Philip Roni
Publisher: John Wiley & Sons
ISBN: 111840663X
Category : Science
Languages : en
Pages : 332
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Book Description
With $2 billion spent annually on stream restoration worldwide, there is a pressing need for guidance in this area, but until now, there was no comprehensive text on the subject. Filling that void, this unique text covers both new and existing information following a stepwise approach on theory, planning, implementation, and evaluation methods for the restoration of stream habitats. Comprehensively illustrated with case studies from around the world, Stream and Watershed Restoration provides a systematic approach to restoration programs suitable for graduate and upper-level undergraduate courses on stream or watershed restoration or as a reference for restoration practitioners and fisheries scientists. Part of the Advancing River Restoration and Management Series. Additional resources for this book can be found at: www.wiley.com/go/roni/streamrestoration.
Author:
Publisher:
ISBN:
Category : Fish habitat improvement
Languages : en
Pages : 222
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Book Description
Author: Pierre Magnan
Publisher: Springer Science & Business Media
ISBN: 9401713529
Category : Science
Languages : en
Pages : 345
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Book Description
Salvelinus species are one of the most thoroughly studied groups of fishes. Many reasons explain this intense interest in charr biology. Charrs have a Holarctic distribution encompassing many Asian, North American, and European countries and occupy diverse marine and freshwater environments. Furthermore, the current distribution of charr includes areas that were directly influenced by climate and topographic change associated with the many Pleistocene glaciations. Undoubtedly, these conditions have promoted much of the tremendous morphological, ecological, and genetic variability and plasticity within Salvelinus species and they make charr very good models to study evolutionary processes 'in action'. Many charr species also exhibit demographic characteristics such as slow growth, late maturity, and life in extreme environments, that may increase their susceptibility to extinction from habitat changes and overexploitation, especially in depauperate aquatic habitats. This vulnerability makes understanding their biology of great relevance to biodiversity and conservation. Finally, charr are of great cultural, commercial, and recreational significance to many communities, and their intimate linkage with human societies has stimulated much interest in this enigmatic genus. This volume comprises a selection of papers presented at the fourth International Charr Symposium held in Trois-Rivières (Québec, Canada), from 26 June to 1 July 2000. It includes 31 papers on ecological interactions and behaviour, trophic polymorphism, movement and migration, ecophysiology and evolutionary genetics, ecological parasitology, environmental stress and conservation. These studies cannot cover all recent developments in the ecology, behaviour and conservation of Salvelinus species, but collecting them into a special volume should bring attention to current research on this important genus and stimulate further work on Salvelinus species.
Author: Robert J. Behnke
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 310
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Book Description
Author:
Publisher:
ISBN:
Category : Game protection
Languages : en
Pages : 258
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Book Description
Author: Javier Lobon-Cervia
Publisher: Springer Nature
ISBN: 3031443896
Category :
Languages : en
Pages : 733
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Book Description
Author: J. David Allan
Publisher: Springer Nature
ISBN: 3030612864
Category : Science
Languages : en
Pages : 485
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Book Description
Stream Ecology: Structure and Function of Running Waters is designed to serve as a textbook for advanced undergraduate and graduate students, and as a reference source for specialists in stream ecology and related fields. This Third Edition is thoroughly updated and expanded to incorporate significant advances in our understanding of environmental factors, biological interactions, and ecosystem processes, and how these vary with hydrological, geomorphological, and landscape setting. The broad diversity of running waters – from torrential mountain brooks, to large, lowland rivers, to great river systems whose basins occupy sub-continents – makes river ecosystems appear overwhelming complex. A central theme of this book is that although the settings are often unique, the processes at work in running waters are general and increasingly well understood. Even as our scientific understanding of stream ecosystems rapidly advances, the pressures arising from diverse human activities continue to threaten the health of rivers worldwide. This book presents vital new findings concerning human impacts, and the advances in pollution control, flow management, restoration, and conservation planning that point to practical solutions. Reviews of the first edition: ".. an unusually lucid and judicious reassessment of the state of stream ecology" Science Magazine "..provides an excellent introduction to the area for advanced undergraduates and graduate students..." Limnology & Oceanography "... a valuable reference for all those interested in the ecology of running waters." Transactions of the American Fisheries Society Reviews of the second edition: "Overall, a must for the field centre and a good starter text in stream ecology." (TEN News, October, 2007) "Highly recommended. Upper-division undergraduates through faculty." (P. R. Pinet, CHOICE, Vol. 45 (7), 2008) "... a very good, fluidly readable book which contains the latest key scientific knowledge of the ecology of running waters." (Daniel Graeber, International Review of Hydrobiology, Vol. 94 (2), 2009)
