Lost in a sagebrush sea: comparative genetic assessment of an isolated montane population of<i>Tamias amoenus</i>

Bell, Kayce C.; Gunst, Jane Van; Teglas, Mike B.; Hsueh, Jennifer; Matocq, Marjorie D.

doi:10.1093/jmammal/gyaa166

Cited by 3 publications

(4 citation statements)

References 75 publications

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“…This category includes studies that have not found any signs of hybridization in the populations studied or found only very limited evidence e.g., [ 154 , 208 , 209 , 210 , 211 , 212 , 213 , 214 , 215 ]. We found 24 studies that fitted this category.…”

Section: Discussionmentioning

confidence: 99%

Consequences of Hybridization in Mammals: A Systematic Review

Adavoudi¹,

Pilot²

2021

Genes

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Hybridization, defined as breeding between two distinct taxonomic units, can have an important effect on the evolutionary patterns in cross-breeding taxa. Although interspecific hybridization has frequently been considered as a maladaptive process, which threatens species genetic integrity and survival via genetic swamping and outbreeding depression, in some cases hybridization can introduce novel adaptive variation and increase fitness. Most studies to date focused on documenting hybridization events and analyzing their causes, while relatively little is known about the consequences of hybridization and its impact on the parental species. To address this knowledge gap, we conducted a systematic review of studies on hybridization in mammals published in 2010–2021, and identified 115 relevant studies. Of 13 categories of hybridization consequences described in these studies, the most common negative consequence (21% of studies) was genetic swamping and the most common positive consequence (8%) was the gain of novel adaptive variation. The total frequency of negative consequences (49%) was higher than positive (13%) and neutral (38%) consequences. These frequencies are biased by the detection possibilities of microsatellite loci, the most common genetic markers used in the papers assessed. As negative outcomes are typically easier to demonstrate than positive ones (e.g., extinction vs hybrid speciation), they may be over-represented in publications. Transition towards genomic studies involving both neutral and adaptive variation will provide a better insight into the real impacts of hybridization.

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Section: Discussionmentioning

confidence: 99%

Consequences of Hybridization in Mammals: A Systematic Review

Adavoudi¹,

Pilot²

2021

Genes

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“…Similar to studies that demonstrated genetic lineage formation among SI populations, isolation on SIs has also resulted in genetic lineage formation when compared to MC populations (Atwood et al 2011, Barrowclough et al 2006, Bell et al 2021, Derkarabetian et al 2011, Halbritter et al 2019, Love et al 2023, Oline et al 2000. The mechanisms driving lineage formation included genetic drift as well as climate-and habitat-driven selection.…”

Section: Lineage Formation and Reduced Genetic Variationmentioning

confidence: 56%

“…Interestingly, this study reported variable intrapopulation genetic diversity in SI populations compared to uniformly high genetic diversity in MC populations. In addition, SI isolation of Tamias amoenus (Humboldt yellow pine chipmunk) and Tamias minimus (least chipmunk) significantly reduced among-population gene flow, and increased genetic drift led to a loss of genetic variation and subsequent genetic divergence across the SI populations (Figure 3b) (Bell et al 2021). Chipmunks on SIs showed specialization for habitat created by Pinus albicaulis, a tree species also isolated on SIs in the region that is in decline due to anthropogenic stressors.…”

Section: Lineage Formation and Reduced Genetic Variationmentioning

confidence: 99%

Sky Islands Are a Global Tool for Predicting the Ecological and Evolutionary Consequences of Climate Change

Love

Schweitzer

Woolbright

et al. 2023

Annu. Rev. Ecol. Evol. Syst.

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Sky islands are unique geologic formations, home to populations of organisms that have weathered climate change since the Pleistocene. Long-term isolation and climatic differences between sky islands and adjacent mountain chains result in natural laboratories well suited for examining the direct effects of climate change. Here, we review the global sky island literature to examine how taxa have responded to climate change. Results show lineage formation, reduced genetic variation, and trait evolution across taxa driven by genetic drift and natural selection. These effects continue today due to ongoing habitat reduction and steep selective gradients on sky islands relative to mountain chains. Comparative studies and experimental manipulations are needed to build broad inference into how past climate change has shaped the structure and function of whole ecosystems. The next era of sky island research is poised to create a model for climate change responses and eco-evolutionary dynamics, with profound conservation implications. Expected final online publication date for the Annual Review of Ecology, Evolution, and Systematics, Volume 54 is November 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…There is ample evidence that many mammal species, including chipmunks, are shifting distributions (Moritz et al 2008) and are experiencing altered population dynamics and diversity (Rubidge et al 2008) in response to climate change. Some isolated chipmunk populations in the Great Basin are genetically distinct and potentially threatened by habitat loss (Bell et al 2021). Contemporary investigation of T. m. scrutator populations could gauge changes in population fragmentation and diversity, particularly in the peripheral and isolated populations that may warrant recognition as distinct population segments or may have experienced increased isolation and associated genetic drift.…”

Section: Neimentioning

confidence: 99%

Geographic patterns of electrophoretic and morphological variation in the sagebrush least chipmunk (Tamias minimus scrutator)

Bell

Baccus²

2022

Therya

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Variation and differentiation among populations provide a framework to decipher how populations are, or are not, changing due to gene flow, genetic drift, and selection. The sagebrush least chipmunk (Tamias minimus scrutator) is distributed in arid and semi-arid habitats throughout much of the Great Basin and adjacent regions. The broad distribution and variation in elevation of populations make this a good system to assess population variation and the forces shaping differentiation. Here, we use allozyme and morphological datasets to: 1) assess the relative roles of geographic locality and elevation of populations in shaping population structure; 2) examine the level of differentiation of peripheral and isolated populations; and 3) compare the genetic and morphological signals of population variation and structure. We sampled 312 individuals from 12 T. minimus scrutator populations and other areas of their distribution. Individuals were measured for 27 genetic and 61 morphological traits. These datasets were analyzed to determine the distribution of variation and the differentiation among populations and tested for correlations with geographic distance and elevation. Multiple approaches were used to thoroughly compare the signals from each dataset. We found 13 polymorphic electrophoretic loci with most of the variation structured among populations within regions. Eight loci exhibited elevational heterogeneity but most high-elevation populations showed no heterogeneity among populations. Thirty-two morphological characters varied among populations but with no discernable trends across regions or elevations. Populations had varying levels of asymmetric distinctness in morphological characters, but there were no significant differences among populations. Morphological and genetic distance measures were correlated and there was some evidence of a correlation of genetic and geographic distance. We also found some correlation of asymmetric distances with morphological or genetic distances at smaller scales. There was substantial variation of genetic and morphological traits among sagebrush least chipmunk populations. Each population had a unique genetic signature and significant morphological differentiation. Our results suggest that genetic drift is contributing to the structure of these populations, with some evidence of selection shaping the distribution of variation at different elevations. The peripheral populations had mixed signals of isolation among the different datasets, with an overall signature suggesting that genetic drift is also driving the variation among these populations. The different measures of population variation yielded inconsistent signals of population structure, highlighting the need for multiple approaches to assess population variation. The variation among sagebrush least chipmunk populations is impacted by a variety of factors and contemporary investigations may reveal populations responding to alterations in habitat and climate.

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Lost in a sagebrush sea: comparative genetic assessment of an isolated montane population ofTamias amoenus

Cited by 3 publications

References 75 publications

Consequences of Hybridization in Mammals: A Systematic Review

Consequences of Hybridization in Mammals: A Systematic Review

Sky Islands Are a Global Tool for Predicting the Ecological and Evolutionary Consequences of Climate Change

Geographic patterns of electrophoretic and morphological variation in the sagebrush least chipmunk (Tamias minimus scrutator)

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