Groundwater influences on the distribution and abundance of riverine smallmouth bass, Micropterus dolomieu , in pasture landscapes of the midwestern USA

摘要: This study examined how spring-flow (SF) contributions to streams related the distribution and abundance of smallmouth bass Micropterus dolomieu in a predominately pasture landscape Missouri, USA. Stream segments (N = 13) with similar characters were classified by SF volume into high (HSF) or low (LSF) groups. The densities bass, channel unit (CU) use temperature-selection patterns assessed for several life stages frequency distributions age 0 fish. More present stream HSF influence. Age fish twice as likely be segments. Older classes reaches independent contribution. For all classes, particular CUs did not depend on All more pools than other CUs. Microhabitat temperature selection differed among classes. selected warmer temperatures gradual shift towards cooler older length was skewed larger individuals limited influence, whereas smaller individuals. benefits significant groundwater via influence seem increased hatch survival availability optimal adult growth. Thermal refugia stable flows provided springs should recognised their biological potential provide suitable habitat climate change land-use alterations increase regimes alter flow patterns. Published 2011 John Wiley & Sons, Ltd.