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- W2004579437 abstract "Introgressive hybridization threatens the persistence of several species of native salmonids in the western United States, but little is known about the factors influencing the establishment and maintenance of introgressed populations. We examined the occurrence of introgressive hybridization in westslope cutthroat (Oncorhynchus clarki lewisi) and rainbow trout (O. mykiss) populations in relation to physical characteristics of streams, trout density estimates, and the distance from stocking source. Trout were sampled from 80 stream sites in the Clearwater River Basin, Idaho, USA, and tissues from individual trout were analyzed to detect hybridization using noncoding sequences of nuclear DNA. We found a broad zone of hybridization detected at 64% of the sampled sites. The presence and degree of introgression was negatively related to elevation and positively related to stream width in our logistic regression model. Stream elevation and size likely influence hydrologic and thermal regimes. An interaction between the life history characteristics of the native and nonnative trout with these hydrologic and thermal stream gradients could explain the invasion success of rainbow trout and hence, the extent of the hybrid zone. Alternatively, the influence of elevation and stream width could be the result of habitat selection by the parental species, thereby reducing the opportunity for hybridization. Understanding the relationship between abiotic factors and introgressive hybridization will assist fisheries managers when evaluating the potential threat of introgression in different stream habitats and applying the necessary management actions to conserve the native cutthroat trout genotypes across broad landscapes. Corresponding Editor: K. D. Fausch" @default.
- W2004579437 created "2016-06-24" @default.
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- W2004579437 date "2003-02-01" @default.
- W2004579437 modified "2023-10-04" @default.
- W2004579437 title "INTROGRESSIVE HYBRIDIZATION BETWEEN NATIVE CUTTHROAT TROUT AND INTRODUCED RAINBOW TROUT" @default.
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- W2004579437 doi "https://doi.org/10.1890/1051-0761(2003)013[0038:ihbnct]2.0.co;2" @default.
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