Effect of environmental conditions on juvenile recruitment of alewife (Alosa pseudoharengus) and blueback herring (Alosa aestivalis) in fresh water: a coastwide perspective

摘要: The abundance of alewife (Alosa pseudoharengus) and blueback herring aestivalis) has declined throughout their range, there are increasing concerns about conservation status. Because diadromous life history, variability in rates survival fresh water can affect overall recruitment. objective our study was to assess how river temperature flow influence young the year (YOY) recruitment Northeast US. Observations adult juvenile fish five rivers were used construct spawner–YOY recruits models; these chosen because length time series (>15 years) paired observations spawners juveniles. An environmentally explicit stock–recruitment model explained a substantial fraction (41% 80%) variance YOY abundance, depending on system. Our approach allowed for preliminary discussion potential mechanisms, which need be further substantiated by focused field laboratory studies....