Effects of Gravel Morphology on Fine Sediment Accumulation and Survival of Incubating Salmon Eggs PDF Download
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Author: William R. Meehan Publisher: ISBN: Category : Salmon Languages : en Pages : 24
Book Description
Rate of fine sediment accumulation and survival of pink salmon eggs were determined for three types of stream gravels. At low stream flows, round gravel accumulated somewhat more sediment than other gravel types, while at higher discharges angular gravel accumulated more sediment. Survival of pink salmon eggs was slightly higher in angular gravel.
Author: William R. Meehan Publisher: Forgotten Books ISBN: 9780365704447 Category : Science Languages : en Pages : 34
Book Description
Excerpt from Effects of Gravel Morphology on Fine Sediment Accumulation and Survival of Incubating Salmon Eggs The main detrimental effect of fine sediment to fish habitat is due to the reduced permeability of gravel by water during the time of egg and fry development As fine sediment accumulates in streambed gravels, the flow of water is reduced and the ability of water to carry away embryo metabolic wastes is decreased In addition, fine sediment may form a physical barrier to emer gence of fry from subsurface gravels to surface waters (phillips 1971) About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: William R. Meehan Publisher: ISBN: Category : Salmon Languages : en Pages : 24
Book Description
Rate of fine sediment accumulation and survival of pink salmon eggs were determined for three types of stream gravels. At low stream flows, round gravel accumulated somewhat more sediment than other gravel types, while at higher discharges angular gravel accumulated more sediment. Survival of pink salmon eggs was slightly higher in angular gravel.
Author: Allan E. Thomas Publisher: ISBN: Category : Fishes Languages : en Pages : 24
Book Description
A spawning and incubation channel constructed in 1959 on Abernathy Creek near Longview, Washington, has been used for seasons to incubate fall chinook salmon and chum salmon eggs. Survival of eggs from both species was higher than reported for other channels and controlled-flow projects. Studies included effects of sedimentation, egg planting density, and stage of egg development at planting on survival. In early experiments sediment in the upper sections substantially reduced survival. In later experiments, after the construction of a sand trap and settling chamber, survivals significantly increased.
Author: Quinn Decent Publisher: ISBN: Category : Languages : en Pages :
Book Description
Natural and anthropogenic landscape disturbance pressures have accelerated the transfer of fine sediment to streams in forested headwater regions of the eastern slopes of the Rocky Mountains. The accumulation of fine sediment in spawning gravels can reduce survival rates of salmonid eggs by decreasing intragravel flow velocities and dissolved oxygen concentrations. The goal of this study was to examine the effect of fine sediment intrusion on the abiotic characteristics of the salmonid redd and assess the potential consequences for egg development and survival using a physically based numerical model SIDO (Sediment Intrusion and Dissolved Oxygen). Field observations from the Crowsnest River, Alberta, Canada were used to calibrate the model using flow, suspended solids and sediment accumulation data as well as high frequency dissolved oxygen (DO) measurements in spawning gravels. The impact of varying sediment inputs upon sediment intrusion rates, abiotic redd characteristics and fish egg survival rates were assessed using SIDO. Dissolved oxygen concentrations in redds were highly variable both within and between sites and varied with observed changes in river discharge and suspended sediment concentrations. Trends in measured and modelled DO concentrations in redds were generally comparable, reflecting a general decrease in dissolved oxygen levels in spawning gravels over the study period. SIDO was not sensitive to measured short term fluctuations of DO and modelled predictions of DO were higher than measured values. The quantities of sediment ingress predicted by SIDO were lower by an order of magnitude than those measured in ingress baskets. Differences between observed and modelled DO are related to the fact that this physically based model does not include terms that describe the effects of groundwater and biotic (microbial) processes on dissolved oxygen in spawning gravels. The potential of SIDO as a tool for fisheries management will be enhanced by including terms that describe groundwater and microbial processes that influence spawning gravel DO dynamics.
Author: Francis T. Buckland Publisher: Forgotten Books ISBN: 9780260330123 Category : Sports & Recreation Languages : en Pages : 292
Book Description
Excerpt from Fish Hatching How the Fish deposits her Spawn. - Fish Nests. - Sa1mon Spawning. - Trouts' Nests - Experiment with Eggs. - Sa1mon depositing its Eggs. - Salmon covers her Eggs. - The 01d Soldier. -skeleton of Salmon. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: National Research Council Publisher: National Academies Press ISBN: 9780309045346 Category : Technology & Engineering Languages : en Pages : 580
Book Description
Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Author: William R. Meehan
Author: William R. Meehan
Author: William R. Meehan
Author: 
Author: Timothy J. Hall
Author: 
Author: 
Author: Allan E. Thomas
Author: Quinn Decent
Author: Francis T. Buckland
Author: National Research Council