Genetic Factors Contributing to Declines of Anadromous Salmonids in the Pacific Northwest

摘要: Deleterious genetic change in wild anadromous salmonids (Oncorhynchus spp.) is expected from fisheries differentially harvesting fish that spawn at particular times within a season, mature sizes or ages, grow rates. Other sources include overfishing, habitat degradation destruction, and interactions with hatchery fish, particularly when these phenomena severely reduce population size. Gene flow to populations also deleterious because genetically adapt the unnatural conditions of environment expense adaptation for living natural streams. This domestication significant even first generation rearing. Spawner-recruit theory serves as framework discussing consequences change. can illustrate how fitness productivity reduced whether largely offset by selection one generation, accumulates over many generations. Although our knowledge far complete, sufficient information exists demand actions avoid As additional becomes available, may be changed, perhaps relaxed. One suggested action establish maintain “refuge” are protected degradation, selective intense fishing, fish.