Author: Terry A. Jackson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 244
Book Description
Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were observed at a high flow during the spring of 1989 and at a low flow during the spring of 1991 in the lower American River of California. Parameters of microhabitats in eight macrohabitats were measured. Mean column water velocity and total water depth variables were used to statistically compare juvenile chinook salmon microhabitat distributions between and among macrohabitat type/reach and flow combinations. Using mean column water velocity and total water depth as independent variables, each macrohabitat type/reach appeared to be unique. Mean column water velocity seemed to be a better descriptor of juvenile chinook salmon habitat selection than was total water depth. Riffles appeared to be the preferred macrohabitats for large non-schooling chinook salmon at both flow levels. Root wads, woody debris, and submerged terrestrial vegetation were utilized extensively and provided a significant cover for schooling chinook salmon during the high flow period. Habitat utilization by chinook salmon appears to be influenced by nonhydraulic variables. Application of models in current instream flow studies need to include factors such as water temperature and aquatic insect production.
Microhabitat Utilization by Juvenile Chinook Salmon (Oncorhynchus Tshawytscha) in Relation to Stream Discharges in the Lower American River of California
Author: Terry A. Jackson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 244
Book Description
Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were observed at a high flow during the spring of 1989 and at a low flow during the spring of 1991 in the lower American River of California. Parameters of microhabitats in eight macrohabitats were measured. Mean column water velocity and total water depth variables were used to statistically compare juvenile chinook salmon microhabitat distributions between and among macrohabitat type/reach and flow combinations. Using mean column water velocity and total water depth as independent variables, each macrohabitat type/reach appeared to be unique. Mean column water velocity seemed to be a better descriptor of juvenile chinook salmon habitat selection than was total water depth. Riffles appeared to be the preferred macrohabitats for large non-schooling chinook salmon at both flow levels. Root wads, woody debris, and submerged terrestrial vegetation were utilized extensively and provided a significant cover for schooling chinook salmon during the high flow period. Habitat utilization by chinook salmon appears to be influenced by nonhydraulic variables. Application of models in current instream flow studies need to include factors such as water temperature and aquatic insect production.
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 244
Book Description
Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were observed at a high flow during the spring of 1989 and at a low flow during the spring of 1991 in the lower American River of California. Parameters of microhabitats in eight macrohabitats were measured. Mean column water velocity and total water depth variables were used to statistically compare juvenile chinook salmon microhabitat distributions between and among macrohabitat type/reach and flow combinations. Using mean column water velocity and total water depth as independent variables, each macrohabitat type/reach appeared to be unique. Mean column water velocity seemed to be a better descriptor of juvenile chinook salmon habitat selection than was total water depth. Riffles appeared to be the preferred macrohabitats for large non-schooling chinook salmon at both flow levels. Root wads, woody debris, and submerged terrestrial vegetation were utilized extensively and provided a significant cover for schooling chinook salmon during the high flow period. Habitat utilization by chinook salmon appears to be influenced by nonhydraulic variables. Application of models in current instream flow studies need to include factors such as water temperature and aquatic insect production.
Delta-Mendota Canal, California Aqueduct Intertie: Appendices
Author:
Publisher:
ISBN:
Category : California Aqueduct (Calif.)
Languages : en
Pages : 408
Book Description
Publisher:
ISBN:
Category : California Aqueduct (Calif.)
Languages : en
Pages : 408
Book Description
Freeport Regional Water Project
South Delta Improvements Program
West Sacramento General Reevaluation Report
Author: United States. Office of the Assistant Secretary of the Army (Civil Works)
Publisher:
ISBN:
Category : Erosion
Languages : en
Pages : 1636
Book Description
Publisher:
ISBN:
Category : Erosion
Languages : en
Pages : 1636
Book Description
Influence of Streamflow and Predators on Habitat Choice by Trout
Author: Elizabeth Ann Campbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
Book Description
Contributions to the Biology of Central Valley Salmonids: Chinook salmon in the lower American River, California's largest urban stream
Author: Randall L. Brown
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 380
Book Description
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 380
Book Description
Velocity
Author: Erik Donofrio
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
Book Description
Due to overfishing, land-use change, and climate change, many freshwater salmonid populations are at risk or already imperiled. Research addressing the biological mechanisms behind habitat selection is important if these populations are to be protected and restored. A literature review of salmonid habitat selection models has shown there is a lack of habitat selection data that relate a fitness surrogate, such as energy intake, to habitat selection. Descriptive studies of habitat selection, such as comparisons between use and availability, generally cannot elucidate the actual mechanisms producing differential selection of habitats. To identify potential factors affecting the decline of Chinook Salmon (Oncorhynchus tshawytscha) in Alaska, we examined the relationship between reactive distance, prey capture success, and water velocity for juvenile Chinook Salmon and used these results test the net energy gain habitat selection model of Grossman et al. (2002). We conducted two experiments, the first with 27 fish between 58 and 84 mm standard length (SL) and weight between 2.8 and 7.5 grams, and the second using pairs of dominant and subordinate fish (i.e., larger and smaller, mean difference= 7 mm (SL)) to test for the effects of dominance on prey capture success. Using an artificial stream tank, we tested juvenile Chinook Salmon at 10 cm/s velocity increments (10 cm/s to 60 cm/s) using frozen brine shrimp (Artemia spp.) as prey. Reactive distances for single fish trials averaged 32.7 cm and did not show significant velocity effects (p=0.66). Velocity was inversely related to prey capture success in a non-linear manner (p
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
Book Description
Due to overfishing, land-use change, and climate change, many freshwater salmonid populations are at risk or already imperiled. Research addressing the biological mechanisms behind habitat selection is important if these populations are to be protected and restored. A literature review of salmonid habitat selection models has shown there is a lack of habitat selection data that relate a fitness surrogate, such as energy intake, to habitat selection. Descriptive studies of habitat selection, such as comparisons between use and availability, generally cannot elucidate the actual mechanisms producing differential selection of habitats. To identify potential factors affecting the decline of Chinook Salmon (Oncorhynchus tshawytscha) in Alaska, we examined the relationship between reactive distance, prey capture success, and water velocity for juvenile Chinook Salmon and used these results test the net energy gain habitat selection model of Grossman et al. (2002). We conducted two experiments, the first with 27 fish between 58 and 84 mm standard length (SL) and weight between 2.8 and 7.5 grams, and the second using pairs of dominant and subordinate fish (i.e., larger and smaller, mean difference= 7 mm (SL)) to test for the effects of dominance on prey capture success. Using an artificial stream tank, we tested juvenile Chinook Salmon at 10 cm/s velocity increments (10 cm/s to 60 cm/s) using frozen brine shrimp (Artemia spp.) as prey. Reactive distances for single fish trials averaged 32.7 cm and did not show significant velocity effects (p=0.66). Velocity was inversely related to prey capture success in a non-linear manner (p
An Analysis of the Prolonged Swimming Performance of Hatchery and River Juvenile Chinook Salmon (Oncorhynchus Tshawytscha) from the Lower American River, California
Author: Katherine L. Seefloth
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
Book Description
Intermittent Streams as Rearing Habitat for Sacramento River Chinook Salmon (oncorhynchus Tshawytscha)
Author: Paul Maslin
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 62
Book Description
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 62
Book Description