Shallow Tidal Freshwater Habitats of the Columbia River: Spatial and Temporal Variability of Fish Communities and Density, Size, and Genetic Stock Composition of Juvenile Chinook Salmon

摘要: AbstractWe investigated the spatial and temporal variability of fish community density, size, genetic stock composition juvenile Chinook Salmon Oncorhynchus tshawytscha in shallow tidal freshwater habitats Columbia River. We sought to address data gaps related this portion River thereby inform habitat restoration efforts. examined communities, salmon life history characteristics, relationships between density conditions by using beach seine collected over a 63-month period (2007−2012) from two areas: Sandy delta (river kilometer [rkm] 188–202) lower river reach (rkm 110–141). found few differences across study areas. Fish patterns were largely attributable seasonal changes as opposed gradients types. Juvenile most common species our catches; spec...