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Distribution, Abundance, Growth, And Habitat Use Of Steelhead In Uvas Creek, Ca, Joel Malone Casagrande
Distribution, Abundance, Growth, And Habitat Use Of Steelhead In Uvas Creek, Ca, Joel Malone Casagrande
Master's Theses
Distribution, abundance, growth, and habitat use of juvenile steelhead (Onorhynchus mykiss) were studied in a central California stream under two increased summer flow reservoir release strategies. The effect of habitat quality (including longitudinal changes in flow, water temperature, canopy closure, substrate quality, and turbidity) on abundance and growth of steelhead among sites was determined. Increased stream flow extended rearing habitat and steelhead distribution downstream to reaches that previously would have been dry. Yearling or older steelhead were relatively scarce at all Uvas Creek sites. Steelhead were most abundant, but small, in the upstream half of the study reach, …
Aquatic Ecology Of San Felipe Lake, San Benito County, California, Julie Renee Casagrande
Aquatic Ecology Of San Felipe Lake, San Benito County, California, Julie Renee Casagrande
Master's Theses
This two-year study examined San Felipe Lake environmental factors and food-web relationships. The lake is shallow, warm, productive, and generally well-mixed. High turbidity resulted from wind mixing of bottom sediments, carp feeding activity, and plankton blooms and excluded submerged aquatic plants. Emergent vegetation was restricted by cattle grazing. Summer temperatures reached 26-28°C throughout the water column, and dissolved oxygen was occasionally low on the bottom overnight and during windless daytime periods. Phytoplankton, fine organic matter, and detritus formed the base of the food web, supporting a zooplankton community dominated by copepods, the water column macroinvertebrate Neomysis, and several open water …