Genetic introgression of cultured rainbow trout in the Mexican native trout complex

Escalante, Marco A.; León, Francisco J. Garcı́a de; Dillman, Casey B.; Camarillo, Anabelia de los Santos; George, Anna L.; Barriga-Sosa, Irene de los A.; Ruiz‐Luna, Arturo; Mayden, Richard L.; Manel, Stéphanie

doi:10.1007/s10592-014-0599-7

Cited by 22 publications

(26 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Invasive hybridization is especially problematic for fishes because there are limited pre‐ or postzygotic barriers to introgression among closely related taxa, and humans intentionally propagated and released staggering numbers of non‐native fish over the previous century (Gozlan, Britton, Cowx, & Copp, ). This is true for salmonids in the genera Oncorhynchus , Salmo , and Salvelinus , where widespread introductions for sportfishing and harvest have resulted in extensive introgression among populations and species (Allendorf & Leary, ; Araguas, Sanz, Pla, & García‐Marín, ; Escalante et al., ; Harbicht, Alshamlih, Wilson, & Fraser, ; Heath, Bettles, & Roff, ; Marie, Bernatchez, & Garant, ). Invasive hybridization in these taxa could be intensified by climate change, which is predicted to profoundly affect coldwater aquatic ecosystems by increasing stream temperatures, altering streamflow regimes, and increasing the frequency and severity of disturbance events, such as extreme drought and floods (Woodward, Perkins, & Brown, ), with substantial consequences for the spread of introduced salmonid species and their genes (Almodovar, Nicola, Ayllon, & Elvira, ; Comte & Grenouillet, ; Kelly, Whiteley, & Tallmon, ; Kovach, Muhlfeld, et al., ; Wenger et al., ).…”

Section: Introductionmentioning

confidence: 99%

Legacy introductions and climatic variation explain spatiotemporal patterns of invasive hybridization in a native trout

Muhlfeld

Kovach

Al‐Chokhachy

et al. 2017

Global Change Biology

105

View full text Add to dashboard Cite

Hybridization between invasive and native species, a significant threat to worldwide biodiversity, is predicted to increase due to climate-induced expansions of invasive species. Long-term research and monitoring are crucial for understanding the ecological and evolutionary processes that modulate the effects of invasive species. Using a large, multidecade genetics dataset (N = 582 sites, 12,878 individuals) with high-resolution climate predictions and extensive stocking records, we evaluate the spatiotemporal dynamics of hybridization between native cutthroat trout and invasive rainbow trout, the world's most widely introduced invasive fish, across the Northern Rocky Mountains of the United States. Historical effects of stocking and contemporary patterns of climatic variation were strongly related to the spread of hybridization across space and time. The probability of occurrence, extent of, and temporal changes in hybridization increased at sites in close proximity to historical stocking locations with greater rainbow trout propagule pressure, warmer water temperatures, and lower spring precipitation. Although locations with warmer water temperatures were more prone to hybridization, cold sites were not protected from invasion; 58% of hybridized sites had cold mean summer water temperatures (<11°C). Despite cessation of stocking over 40 years ago, hybridization increased over time at half (50%) of the locations with long-term data, the vast majority of which (74%) were initially nonhybridized, emphasizing the chronic, negative impacts of human-mediated hybridization. These results show that effects of climate change on biodiversity must be analyzed in the context of historical human impacts that set ecological and evolutionary trajectories.

show abstract

Section: Introductionmentioning

confidence: 99%

Legacy introductions and climatic variation explain spatiotemporal patterns of invasive hybridization in a native trout

Muhlfeld

Kovach

Al‐Chokhachy

et al. 2017

Global Change Biology

105

View full text Add to dashboard Cite

show abstract

“…gilae have been lost due to hybridization [ 21 ]. A recent genetic study found some evidence of introgression of Mexican trout populations by hatchery rainbow trout but it was generally restricted to the areas around the hatcheries [ 30 ]. However, it is critical to further examine the existence and extent of introgression of hatchery rainbow trout from a broad range of potential source stocks into populations of Mexican native trout to fully understand the extent of this threat and take appropriate conservation actions.…”

Section: Introductionmentioning

confidence: 99%

Genetic Structure of Pacific Trout at the Extreme Southern End of Their Native Range

et al. 2015

Self Cite

View full text Add to dashboard Cite

Salmonid fishes are cold water piscivores with a native distribution spanning nearly the entire temperate and subarctic northern hemisphere. Trout in the genus Oncorhynchus are the most widespread salmonid fishes and are among the most important fish species in the world, due to their extensive use in aquaculture and valuable fisheries. Trout that inhabit northwestern Mexico are the southernmost native salmonid populations in the world, and the least studied in North America. They are unfortunately also facing threats to their continued existence. Previous work has described one endemic species, the Mexican golden trout (O. chrysogaster), and one endemic subspecies, Nelson’s trout (O. mykiss nelsoni), in Mexico, but previous work indicated that there is vastly more biodiversity in this group than formally described. Here we conducted a comprehensive genetic analysis of this important group of fishes using novel genetic markers and techniques to elucidate the biodiversity of trout inhabiting northwestern Mexico, examine genetic population structure of Mexican trout and their relationships to other species of Pacific trout, and measure introgression from non-native hatchery rainbow trout. We confirmed substantial genetic diversity and extremely strong genetic differentiation present in the Mexican trout complex, not only between basins but also between some locations within basins, with at least four species-level taxa present. We also revealed significant divergence between Mexican trout and other trout species and found that introgression from non-native rainbow trout is present but limited, and that the genetic integrity of native trout is still maintained in most locations. This information will help to guide effective conservation strategies for this important group of fishes.

show abstract

“…These interior populations of native O. mykiss occurring east of the Cascade Range and Sierra Nevada are referred to as Redband Trout in the United States (Smith et al 2002;Meyer et al 2014;Muhlfeld et al 2015) and consist of three genetically distinct lineages, comparable to those among other Pacific trout subspecies (Figure 1; Currens et al 2009). Some of the diversity of both O. clarkii and O. mykiss has been obscured by extensive introductions of both domesticated Rainbow Trout and other lineages of Rainbow and Cutthroat trouts into locations where they were not historically present (Metcalf et al 2012;Escalante et al 2014;Abadía-Cardoso et al 2015).…”

Section: Evolutionary Diversitymentioning

confidence: 99%

“…Introductions of nonnative fishes, such as Brook Trout, Brown Trout, Lake Trout, Northern Pike Esox lucius, and Smallmouth Bass Micropterus dolomieu, have led to the decline and local extirpation of many native Pacific trout through ecological interactions (e.g., competition, predation, disease transfer; Rahel 2000;Dunham et al 2004;Muhlfeld et al 2008). Further, introductions of trout outside of their native range have resulted in introgression and homogenization between historically allopatric lineages and subspecies, and widespread introductions of strains of Rainbow Trout have been a major cause of the loss of Pacific trout throughout their range (Allendorf and Leary 1988;Yau and Taylor 2013;Escalante et al 2014). The importance of a growing list of non-salmonid nonnative species (Sanderson et al 2009), particularly cool-and warmwater fishes (Lawrence et al 2014) that are invading native Pacific trout habitat, warrants increasing attention, especially for streams that are warming due to climate change or local land and water uses.…”

Section: Nonnative Speciesmentioning

confidence: 99%

Conservation of Native Pacific Trout Diversity in Western North America

et al. 2016

Self Cite

View full text Add to dashboard Cite

Pacific trout Oncorhynchus spp. in western North America are strongly valued in ecological, socioeconomic, and cultural views, and have been the subject of substantial research and conservation efforts. Despite this, the understanding of their evolutionary histories, overall diversity, and challenges to their conservation is incomplete. We review the state of knowledge on these important issues, focusing on Pacific trout in the genus Oncorhynchus. Although most research on salmonid fishes emphasizes Pacific salmon, we focus on Pacific trout because they share a common evolutionary history, and many taxa in western North America have not been formally described, particularly in the southern extent of their ranges. Research in recent decades has led to the revision of many hypotheses concerning the origin and diversification of Pacific trout throughout their range. Although there has been significant success at addressing past threats to Pacific trout, contemporary and future threats represented by nonnative species, land and water use activities, and climate change pose challenges and uncertainties. Ultimately, conservation of Pacific trout depends on how well these issues are understood and addressed, and on solutions that allow these species to coexist with a growing scope of human influences. Conservación de la diversidad de truchas nativas del Pacífico en el oeste de NorteaméricaLa trucha del Pacífico Oncorhynchus spp. en el oeste de Norteamérica tiene un alto valor desde el punto de vista ecológi-co, socioeconómico y cultural, y ha sido objeto de importantes esfuerzos de conservación e investigación. A pesar de ello, el conocimiento que se tiene sobre su historia evolutiva, diversidad general y retos de conservación sigue siendo incompleto. Se hace una revisión del estado del conocimiento sobre estos puntos, con énfasis en la trucha del Pacífico dentro del género Oncorhynchus. Si bien la mayor parte de los estudios hechos sobre salmónidos se enfocan al salmón del Pací-fico, aquí nos enfocamos en la trucha del Pacífico ya que ambos groupos de especies comparten una historia evolutiva en común sobre todo en lo que se refiere al extremo sur de sus rangos de distribución. En investigaciones llevadas a cabo en décadas recientes, se han revisado varias hipótesis relativas al origen y diversificación de la trucha del Pacífico a lo largo de su rango de distribución. Aunque se han logrado identificar adecuadamente las amenazas pasadas que enfrentó la trucha del Pacífico, las amenazas actuales y futuras que representan especies no nativas, actividades de uso de tierra y agua y el cambio climático se consideran importantes retos e incertidumbres. Al final, la conservación de la trucha del Pacífico depende de qué tan bien se comprendan y abordan estos temas, y de las soluciones que les permitan a estas especies coexistir con una gama creciente de influencias humanas. Conservation de la diversité de la truite du Pacifique indigène dans l'ouest de l'Amérique du NordLes truites du Pacifique ou Oncorhynchus spp. dans l'ouest...

show abstract

Genetic introgression of cultured rainbow trout in the Mexican native trout complex

Cited by 22 publications

References 43 publications

Legacy introductions and climatic variation explain spatiotemporal patterns of invasive hybridization in a native trout

Legacy introductions and climatic variation explain spatiotemporal patterns of invasive hybridization in a native trout

Genetic Structure of Pacific Trout at the Extreme Southern End of Their Native Range

Conservation of Native Pacific Trout Diversity in Western North America

Contact Info

Product

Resources

About