Trout Responses to Habitat Manipulation in Streams at Individual and Population Scales PDF Download
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Author: Charles Gowan
Publisher:
ISBN:
Category : Fish habitat improvement
Languages : en
Pages : 262
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Author: Charles Gowan
Publisher:
ISBN:
Category : Fish habitat improvement
Languages : en
Pages : 262
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Book Description
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: Steven Floyd Railsback
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 92
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Author: Steven F. Railsback
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 92
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 96
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Author: Javier Lobón-Cerviá
Publisher: John Wiley & Sons
ISBN: 1119268311
Category : Technology & Engineering
Languages : en
Pages : 821
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Book Description
Brown Trout: Biology, Ecology and Management A comprehensive guide to the most current research, history, genetics and ecology of the brown trout including challenging environmental problems The brown trout is an iconic species across its natural European distribution and has been introduced throughout the World. Brown Trout offers a comprehensive review of the scientific information and current research on this major fish species. While the brown trout is the most sought species by anglers, its introduction to various waters around the world is causing serious environmental problems. At the same time, introduction of exogenous brown trout lineages threats conservation of native gene pools of populations in many regions. The authors summarize the important aspects of the brown trout’s life history and ecology and focus on the impact caused by the species. The text explores potential management strategies in order to maintain numerous damaged populations within its natural distributional range and to ameliorate its impacts in exotic environments. The authors include information on a wide-range of topics such as recent updates in population genetics, evolutionary history, reproductive traits and early ontogeny, life history plasticity in anadromous brown trout and life history of the adfluvial brown trout and much more. This vital resource: Contains the latest research on the biology and ecology of brown trout Includes information on phylogeography, genetics, population dynamics and stock management Spotlights the brown trout’s introduction to regions around the world and the serious environmental impacts Offers a comprehensive review of conservation and management techniques Written for salmonid scientists and researchers, fishery and environmental managers, and students of population genetics, ecology and population dynamics, Brown Trout explores the most recent findings on the history, ecology and sustainability of this much-researched species.
Author:
Publisher:
ISBN:
Category : Aquatic sciences
Languages : en
Pages : 1032
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Author: Jack A. Burgess
Publisher:
ISBN:
Category : Aquatic animals
Languages : en
Pages : 190
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Book Description
Response of aquatic vertebrates to increased pool habitat complexity due to abundance of large wood was evaluated experimentally in three streams in the Cascade Mountains of Oregon. No difference in aquatic vertebrate density was detected among treatments, though there was a trend of increasing aquatic vertebrate density with increasing large wood abundance. The small change in density of aquatic vertebrate species may have been due to the overriding influence of the high habitat heterogeneity associated with cobble/boulder substrate in these streams. Large wood may have a stronger influence in simpler streams with smaller particle size, in differing environmental regimes, or at spatial scales larger than channel unit. Mark-recapture estimates, catchability-based estimates, and maximum likelihood multiple removal estimates were compared in all three streams. Physical heterogeneity influenced efficiency of capture. The single pass catchability-based estimates were larger than mark-recapture estimates and maximum likelihood multiple removal estimates. Mark-recapture estimates were larger than maximum likelihood multiple removal estimates. The mark-recapture method gives more reliable and accurate estimates than maximum likelihood multiple removal method, but both methods may substantially underestimate the population. Taxon, fish length, and habitat variables influenced catchability for the population estimators examined. Probability of capture of vertebrates for the catchability-based estimator consistently decreased with increasing habitat complexity. Understanding factors that affect the accuracy of population estimators and the impact that habitat may have on catchability will assist fisheries scientists and managers in making informed decisions regarding the selection of a population estimation method. Research on habitat restoration and habitat relationships must recognize limitations of population estimators and catchability. Recognition of the limitations of population estimators and catchability should allow resource scientists to design more reliable monitoring and evaluation of habitat restoration projects.
Author: Ray J. White
Publisher:
ISBN:
Category :
Languages : en
Pages : 2477
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 886
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