Hybridization between Yellowstone Cutthroat Trout and Rainbow Trout in the Upper Snake River Basin, Wyoming

Kovach, Ryan P.; Eby, Lisa A.; Corsi, Matthew P.

doi:10.1080/02755947.2011.640899

Cited by 21 publications

(35 citation statements)

References 46 publications

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“…Although hybridization dynamics in westslope cutthroat trout have been extensively studied (e.g., Allendorf & Leary, 1988, ; Muhlfeld et al, , , ; Bennett, Olson, Kershner, & Corbett, ; Hohenlohe et al, ; Loxterman et al, ; Kovach et al, ; Young et al, ), relatively little work has focused on Yellowstone cutthroat trout hybridization (but see Kovach et al, ; Ostberg et al, , and others). It is an open question to what extent hybridization dynamics are consistent or variable across hybridizing pairs of species or subspecies within a genus.…”

Section: Introductionmentioning

confidence: 99%

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

et al. 2019

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Hybridization can profoundly affect the genomic composition and phenotypes of closely related species, and provides an opportunity to identify mechanisms that maintain reproductive isolation between species. Recent evidence suggests that hybridization outcomes within a species pair can vary across locations. However, we still do not know how variable outcomes of hybridization are across geographic replicates, and what mechanisms drive that variation. In this study, we described hybridization outcomes across 27 locations in the North Fork Shoshone River basin (Wyoming, USA) where native Yellowstone cutthroat trout and introduced rainbow trout co‐occur. We used genomic data and hierarchical Bayesian models to precisely identify ancestry of hybrid individuals. Hybridization outcomes varied across locations. In some locations, only rainbow trout and advanced backcrossed hybrids towards rainbow trout were present, while trout in other locations had a broader range of ancestry, including both parental species and first‐generation hybrids. Later‐generation intermediate hybrids were rare relative to backcrossed hybrids and rainbow trout individuals. Using an individual‐based simulation, we found that outcomes of hybridization in the North Fork Shoshone River basin deviate substantially from what we would expect under null expectations of random mating and no selection against hybrids. Since this deviation implies that some mechanisms of reproductive isolation function to maintain parental taxa and a diversity of hybrid types, we then modelled hybridization outcomes as a function of environmental variables and stocking history that are likely to affect prezygotic barriers to hybridization. Variables associated with history of fish stocking were the strongest predictors of hybridization outcomes, followed by environmental variables that might affect overlap in spawning time and location.

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Section: Introductionmentioning

confidence: 99%

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

et al. 2019

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“…evidence for non-random population structure or mating), we used non-parametric bootstrap resampling over individuals (1000 replicates) to construct standard errors for the pRBT in each sample, and to construct confidence intervals around our test statistic (pRBT in adult fish -pRBT in juvenile fish). Non-random population structure in RBT Â WCT hybrid zones is relatively common [21,41] and probably reflects the combined effects of dispersal and selection ( [39] and see §3), and some degree of assortative mating owing to slight differences in reproductive timing [31]. We used a conservative a ¼ 0.01 as our significance threshold because the bootstrap method accounts only for sampling error, but error owing to genetic drift occurring between the adult and juvenile generations [42,43] may also be occurring.…”

Section: (C) Genetic Analysesmentioning

confidence: 99%

Dispersal and selection mediate hybridization between a native and invasive species

et al. 2015

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Hybridization between native and non-native species has serious biological consequences, but our understanding of how dispersal and selection interact to influence invasive hybridization is limited. Here, we document the spread of genetic introgression between a native (Oncorhynchus clarkii) and invasive (Oncorhynchus mykiss) trout, and identify the mechanisms influencing genetic admixture. In two populations inhabiting contrasting environments, non-native admixture increased rapidly from 1984 to 2007 and was driven by surprisingly consistent processes. Individual admixture was related to two phenotypic traits associated with fitness: size at spawning and age of juvenile emigration. Fish with higher non-native admixture were larger and tended to emigrate at a younger age-relationships that are expected to confer fitness advantages to hybrid individuals. However, strong selection against non-native admixture was evident across streams and cohorts (mean selection coefficient against genotypes with non-native alleles (s) ¼ 0.60; s.e. ¼ 0.10). Nevertheless, hybridization was promoted in both streams by the continuous immigration of individuals with high levels of non-native admixture from other hybrid source populations. Thus, antagonistic relationships between dispersal and selection are mediating invasive hybridization between these fish, emphasizing that data on dispersal and natural selection are needed to fully understand the dynamics of introgression between native and non-native species.

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“…) and existing populations of YCT currently occupy thermally suitable streams (range of average daily temperatures May 1st to September 30th = 5.9–16.8 °C) at elevations ranging from 1168 to 3317 m. Extant populations of YCT continue to be vulnerable to the adverse effects of non‐native species (Gresswell, ). Populations of non‐native brook trout ( Salvelinus fontinalis ) and rainbow trout ( O. mykiss ) represent significant threats to YCT through competition (Destaso & Rahel, ; Seiler & Keeley, ; Buys et al ., ), higher survival via life‐history differences (Peterson et al ., ; McGrath & Lewis, ), and hybridization (Allendorf et al ., ; Gunnell et al ., ; Muhlfeld et al ., ; Kovach et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Thermal controls of Yellowstone cutthroat trout and invasive fishes under climate change

Al‐Chokhachy

Alder

Hostetler

et al. 2013

Global Change Biology

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We combine large observed data sets and dynamically downscaled climate data to explore historic and future (2050-2069) stream temperature changes over the topographically diverse Greater Yellowstone Ecosystem (elevation range = 824-4017 m). We link future stream temperatures with fish growth models to investigate how changing thermal regimes could influence the future distribution and persistence of native Yellowstone cutthroat trout (YCT) and competing invasive species. We find that stream temperatures during the recent decade (2000-2009) surpass the anomalously warm period of the 1930s. Climate simulations indicate air temperatures will warm by 1 °C to >3 °C over the Greater Yellowstone by mid-21st century, resulting in concomitant increases in 2050-2069 peak stream temperatures and protracted periods of warming from May to September (MJJAS). Projected changes in thermal regimes during the MJJAS growing season modify the trajectories of daily growth rates at all elevations with pronounced growth during early and late summer. For high-elevation populations, we find considerable increases in fish body mass attributable both to warming of cold-water temperatures and to extended growing seasons. During peak July to August warming, mid-21st century temperatures will cause periods of increased thermal stress, rendering some low-elevation streams less suitable for YCT. The majority (80%) of sites currently inhabited by YCT, however, display minimal loss (<10%) or positive changes in total body mass by midcentury; we attribute this response to the fact that many low-elevation populations of YCT have already been extirpated by historical changes in land use and invasions of non-native species. Our results further suggest that benefits to YCT populations due to warmer stream temperatures at currently cold sites could be offset by the interspecific effects of corresponding growth of sympatric, non-native species, underscoring the importance of developing climate adaptation strategies that reduce limiting factors such as non-native species and habitat degradation.

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Hybridization between Yellowstone Cutthroat Trout and Rainbow Trout in the Upper Snake River Basin, Wyoming

Cited by 21 publications

References 46 publications

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

Dispersal and selection mediate hybridization between a native and invasive species

Thermal controls of Yellowstone cutthroat trout and invasive fishes under climate change

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