Hybridization with rainbow trout alters life history traits of native westslope cutthroat trout

摘要: Hybridization with rainbow trout is a primary threat to the conservation of westslope cutthroat (Oncorhynchus clarkii lewisi; hereafter cutthroat) across its native range. Cutthroat policy hinges on degree which populations are hybridized, yet little known about differences in life history individuals varying degrees ancestry. We examined growth, fecundity, and migration timing between hybrid migratory components from 2006 2009 Jocko River, Montana. detected positive linear relationships ancestry somatic growth egg size, but negative relationship fecundity. US federal suggests threshold 20% for conservation. In our study, hybrids ≥20% had significantly lower fecundity larger sizes migrated earlier at discharges stream temperatures than <20% ra...