Spatial variation in climate mediates gene flow across an island archipelago

Logan, Michael L.; Duryea, M. Catherine; Molnár, Orsolya; Kessler, Benji J.; Calsbeek, Ryan

doi:10.1111/evo.13031

Cited by 24 publications

(27 citation statements)

References 69 publications

(132 reference statements)

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“…Spatial heterogeneity in climate change regimes, however, has the potential to disrupt dispersal patterns, limiting gene flow and constraining the movement of potentially beneficial alleles across a species' range (Angert et al 2011, D'Angelo et al 2015, Logan et al 2016. In this scenario, the heterogeneous spatial pattern of climate change regimes may mimic classical habitat mosaics, with some regions being more hospitable to particular genotypes than others (Barros et al 2016).…”

Section: Asynchronous Regimes Dispersal and Intra-specific Variatiomentioning

confidence: 99%

“…In general, dispersal across heterogeneous landscapes is more difficult than across homogeneous ones, with patterns of local adaptation exacerbating this disparity (Zhang and Buckling 2016). This could result when locally adapted populations are able to resist gene flow either because their fitness is sufficiently higher than that of immigrants (Logan et al 2016) or the social structure of the local population makes it difficult for immigrants to establish (Ingley et al 2016). The opposite can also be true as well, and the introgression of alleles beneficial in other environments can lead to high migration loads, swamping local adaptations, and leading to the extinction of locally adapted populations (Farkas et al 2016).…”

Section: Asynchronous Regimes Dispersal and Intra-specific Variatiomentioning

confidence: 99%

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Spatial and temporal heterogeneity in climate change limits species' dispersal capabilities and adaptive potential

2017

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Global climate change has already caused local declines and extinctions. These losses are generally thought to occur because climate change is progressing too rapidly for populations to keep pace. Based on this hypothesis, numerous predictive frameworks have been developed to project future range shifts and changes in population dynamics resulting from global climate change. However, recent empirical work has demonstrated that seasonally asynchronous climate change regimes -when a region is warming during some parts of the year, but cooling in others -are constraining species' responses to climate change more strongly than rapid warming, leading to intra-specific variation in responses to climate change and local population declines. Here, we couple a review of the literature related to asynchronous climate change regimes with meta-population simulations and an analysis of long-term North American climate trends to show that seasonally asynchronous regimes are occurring throughout most of North America and that their current spatial distribution may be a strong barrier to dispersal and gene flow across many species' ranges. Thus, even though adaptation to climate change may potentially be more common and rapid than previously thought, species whose ranges overlap with asynchronous regimes will likely succumb to local declines that may be difficult to mitigate via dispersal. Future climate-related predictive frameworks should therefore incorporate asynchronous regimes as well as more traditional measures of climate velocity in order to fully capture the array of potential future climate change scenarios.

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Section: Asynchronous Regimes Dispersal and Intra-specific Variatiomentioning

confidence: 99%

Section: Asynchronous Regimes Dispersal and Intra-specific Variatiomentioning

confidence: 99%

Spatial and temporal heterogeneity in climate change limits species' dispersal capabilities and adaptive potential

2017

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“…haviour, which may lead to plastic or evolutionary shifts in thermal physiology (Hoffmann & Sgrò, 2011;Logan, Cox, & Calsbeek, 2014;Logan, Duryea, Molnar, Kessler, & Calsbeek, 2016;Martin, 2001).…”

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confidence: 99%

Habitat management alters thermal opportunity

Neel

McBrayer

2018

Functional Ecology

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Ectotherms engage in behavioral thermoregulation to optimize body temperatures, however, thermoregulatory effort varies across species, over time, and among habitats. Classic cost‐benefit models of ectothermic thermoregulation postulate that ectotherms should increase thermoregulatory effort when the benefits of thermoregulatory behavior outweigh the costs (Huey and Slatkin, 1976). However, alteration of habitat via land management may lead to unforeseen shifts in microclimate that change associated costs and benefits. In light of anthropogenic impacts on natural habitats, thermoregulatory effort should be examined in cases where land management results in environmental temperatures that deviate from the preferred temperature range of a given species. We examined how habitat management alters microclimates and influences activity time, thermoregulatory behavior, and thermal physiology in a lizard (Sceloporus woodi) whose range has been significantly reduced due to habitat loss. We compared populations from two ecologically distinct habitats: longleaf pine and sand pine scrub, which have very different management histories. Daily surveys were conducted in each habitat type while environmental temperatures were recorded simultaneously with biophysical models. Thermal performance curves differed between populations such that physiological performance was optimized in each environment. Longleaf pine habitat had greater thermal opportunity because cooler microclimates were available on arboreal perches. In longleaf pine habitat, lizards were able to stay active longer and thermoregulate more effectively. Regardless of habitat, thermoregulatory effort of S. woodi increased when thermal quality of habitat was low. However, when unfavorably high temperatures were experienced, the thermoregulatory effort increased significantly. Our results demonstrate that ectotherms can afford to imprecisely thermoregulate when habitat thermal quality is poor due to cooler environmental temperatures. However under unfavorably hot environmental temperatures, lizards must precisely regulate body temperature in spite of any costs. These results further demonstrate that habitat management has major implications on species‐specific thermal opportunity, thermoregulatory behavior, and thermal physiology, such that shifts in thermoregulatory behavior may lead to higher energetic costs, enhanced predation risk, and constrained activity times. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.fec13123/suppinfo is available for this article.

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“…Although A. sagrei is a workhorse in both ecological and evolutionary research programmes (e.g. Cox & Calsbeek, 2015;Driessens, Huyghe, Vanhooydonck, & Damme, 2015;Bonneaud et al, 2016;Delaney & Warner, 2016;Fleishman et al, 2016;Logan, Duryea, Molnar, Kessler, & Calsbeek, 2016;Schoener, Kolbe, Leal, Losos, & Spiller, 2017;Stroud, Giery, & Outerbridge, 2017;Kamath & Losos, 2018;Lapiedra, Schoener, Leal, Losos, & Kolbe, 2018), we have heretofore lacked an understanding of the magnitude and geographic distribution of genetic and morphological diversity within this widespread species. From its ancestral origins in Cuba, A. sagrei has colonized the Bahamas Archipelago to the north and east, as well as the Cayman Islands, Jamaica (although human assistance in this case is debated), the Swan Islands (nearly 500 km south of the western tip A. sagrei is the most common anole, with densities in some places as high as one lizard per square metre (Schoener & Schoener, 1980).…”

Section: Introductionmentioning

confidence: 99%

Phylogeographic and phenotypic outcomes of brown anole colonization across the Caribbean provide insight into the beginning stages of an adaptive radiation

Reynolds

Kolbe

Glor

et al. 2020

J of Evolutionary Biology

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Some of the most important insights into the ecological and evolutionary processes of diversification and speciation have come from studies of island adaptive radiations, yet relatively little research has examined how these radiations initiate. We suggest that Anolis sagrei is a candidate for understanding the origins of the Caribbean Anolis adaptive radiation and how a colonizing anole species begins to undergo allopatric diversification, phenotypic divergence and, potentially, speciation. We undertook a genomic and morphological analysis of representative populations across the entire native range of A. sagrei, finding that the species originated in the early Pliocene, with the deepest divergence occurring between western and eastern Cuba. Lineages from these two regions subsequently colonized the northern Caribbean. We find that at the broadest scale, populations colonizing areas with fewer closely related competitors tend to evolve larger body size and more lamellae on their toepads. This trend follows expectations for post‐colonization divergence from progenitors and convergence in allopatry, whereby populations freed from competition with close relatives evolve towards common morphological and ecological optima. Taken together, our results show a complex history of ancient and recent Cuban diaspora with populations on competitor‐poor islands evolving away from their ancestral Cuban populations regardless of their phylogenetic relationships, thus providing insight into the original diversification of colonist anoles at the beginning of the radiation. Our research also supplies an evolutionary framework for the many studies of this increasingly important species in ecological and evolutionary research.

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Spatial variation in climate mediates gene flow across an island archipelago

Cited by 24 publications

References 69 publications

Spatial and temporal heterogeneity in climate change limits species' dispersal capabilities and adaptive potential

Spatial and temporal heterogeneity in climate change limits species' dispersal capabilities and adaptive potential

Habitat management alters thermal opportunity

Phylogeographic and phenotypic outcomes of brown anole colonization across the Caribbean provide insight into the beginning stages of an adaptive radiation

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