Comparative riverscape genomics of the rainbow darter (<i>Etheostoma caeruleum</i>) in glaciated and unglaciated environments

J, Luiken; Gamble, Tony; Berendzen, Peter B.

doi:10.1002/ece3.8422

Cited by 4 publications

(2 citation statements)

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“…Post‐glacial expansion might result in reduced genetic variation either because of population bottlenecks during recolonization or genetic drift in small refugial populations prior to expansion. Previous smaller studies of the ecologically similar rainbow darters ( E. caeruleum ) as well as other fishes have shown that species with ranges that span glaciated and unglaciated areas have lower genetic diversity in glaciated areas compared to unglaciated areas (Bernatchez & Dodson, 1991; Billington & Hebert, 1991; Haponski & Stepien, 2008; Hewitt, 1996, 2000; Luiken et al, 2021; Sepulveda‐Villet et al, 2009; Sepulveda‐Villet & Stepien, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Fish from previously glaciated basins showed strong genetic (Bernatchez & Dodson, 1991;Billington & Hebert, 1991;Haponski & Stepien, 2008;Hewitt, 1996Hewitt, , 2000Luiken et al, 2021;Sepulveda-Villet et al, 2009;Sepulveda-Villet & Stepien, 2012). Fish from the unglaciated region of Ceasia included at least four recognized species (E. spectabile, E. burri, E. uniporum, and E. pulchellum).…”

Section: Discussionmentioning

confidence: 99%

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Riverscape genetics of the orangethroat darter complex

Belcik,

Ashley

2023

Journal of Fish Biology

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Freshwater darters belonging to the Orangethroat Darter species complex, or Ceasia, are widely distributed in the Central and Southern United States, with ranges that span both glaciated as well as unglaciated regions. Up to 15 species have been recognized in the complex, with one, Etheostoma spectabile, having a widespread northern distribution and another, E. pulchellum, having a sizeable southern distribution. The other species in the complex have much more restricted distributions in unglaciated regions of the Central Highlands. We sampled 384 darters from 52 sites covering much of the range of Ceasia and evaluated patterns of genetic diversity, genetic structure, and pre‐ and post‐glacial patterns of range contraction and expansion. We anticipated finding much stronger signals of genetic differentiation and diversification in unglaciated regions, given the higher species diversity and levels of endemism reported there. Surprisingly, microsatellite genotyping revealed two well‐differentiated genetic clusters of E. spectabile in samples from glaciated regions, one confined to the Illinois River basin and another found in the Wabash drainage and Great Lakes tributaries. This suggests that there was expansion from two isolated glacial refugia, with little subsequent post‐glacial gene flow. Fish collected from throughout the unglaciated region were less genetically differentiated. Fish assigned to E. burri and E. uniporum based on collection sites and morphological characters were not genetically differentiated from E. spectabile samples from the region. Hybridization and introgression occurring in the Central Highlands may confound genetic delineation of species in this region of high endemism and diversity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Riverscape genetics of the orangethroat darter complex

Belcik,

Ashley

2023

Journal of Fish Biology

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Highland islands: assessing gene flow among populations of an aquatic highland endemic

Piller,

Parker,

McMahan

et al. 2023

Biological Journal of the Linnean Society

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A variety of hierarchical gene flow models have been proposed to explain the distribution of genetic variation in aquatic environments. These models, including the Stream Hierarchy (SH), Death Valley (DV), Headwater (HW), and Widespread Gene flow (WG) models, provide testable hypotheses that focus on the degree of within-basin or within-stream network connectivity and an organism’s dispersal abilities. We tested these models using Tlaloc hildebrandi (Profundulidae, Cyprinodontiformes), a freshwater fish endemic to the highlands of the Grijalva and Usumacinta River basins in southern Mexico. Data from ultraconserved elements (UCEs) showed that although T. hildebrandi was recovered as monophyletic, the sub-basins were not. We generated single nucleotide polymorphisms from the UCEs to analyse the data in a population genetic framework. These results differed between analyses such that two (STRUCTURE analysis) or three (DAPC analysis) genetic groupings were recovered. Overall, the results of this study provide support for the SH model. Some individuals from the Jataté sub-basin, however, conformed to the HW model, due to historical connections among headwater streams and rivers of the Jataté and Amarillo–Chenalhó clades/clusters. The greatest degree of gene flow has occurred from the Grijlava to the Usumacinta basins, two geographically proximate basins that have been hypothesized to have had previous connections.

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Riverscape genomics of the endangered freshwater mussel Lampsilis rafinesqueana

Hein,

Farleigh,

Berg

2024

Freshwater Biology

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Historical periods of rapid climate change and associated direct and indirect impacts such as glaciation and restructuring of drainage systems are important in shaping biodiversity, lineage divergence, and contemporary genetic variation amongst many aquatic taxa. Through an understanding of the impacts of these ancient changes in land‐ and waterscapes on current diversity, practitioners can account for a species' unique evolutionary history when developing conservation strategies. We investigated intraspecific genetic diversity of the critically endangered freshwater mussel, Lampsilis rafinesqueana, endemic to the interior region of the U.S.A. Our study (1) characterises genetic variation within and amongst populations to infer biogeographic history and (2) applies genetic information to potential conservation strategies. We applied restriction‐site associated DNA sequencing and mitochondrial DNA sequencing to investigate genetic diversity within and amongst populations of L. rafinesqueana from across the species' distribution. We then considered this information in the context of historical riverscape processes and applicability to conservation. Variation within rivers was similar, but we found different genetic populations associated with two major ecoregions, the Central Interior Highlands and Osage Plains. The plains population displayed an Ne value approximately 10‐fold lower than the highlands population. Historical demographic modelling suggests the two populations diverged approximately 1.2 million years ago and then both populations underwent a substantial decrease in population size around 19,700 years ago. These two major events are each correlated with known periods of historic rapid climate change. We identified two distinct populations of a federally endangered mussel, L. rafinesqueana. Contemporary genetic diversity of this species was strongly influenced by direct and indirect impacts of rapid historic shifts in climate. The highlands population has undergone a recent expansion, typical of post‐Pleistocene climate change, while also having a much larger Ne value than the plains population. Our results suggest low levels of gene flow amongst the two distinct populations across generations. We recommend that conservation managers for this species take into account relative difference in diversity between populations when developing management strategies. In many species, assisted gene flow amongst genetically unique populations should only be considered in extreme circumstances; however, in L. rafinesqueana, low levels of assisted migration amongst populations may be a valuable tactic to maintain natural levels of genetic variation. Our study shows that biogeographical frameworks can be useful for developing conservation strategies that serve to retain important genomic variation that represents the evolutionary potential of target freshwater species.

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Comparative riverscape genomics of the rainbow darter (Etheostoma caeruleum) in glaciated and unglaciated environments

Abstract: This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 4 publications

References 71 publications

Riverscape genetics of the orangethroat darter complex

Riverscape genetics of the orangethroat darter complex

Highland islands: assessing gene flow among populations of an aquatic highland endemic

Riverscape genomics of the endangered freshwater mussel Lampsilis rafinesqueana

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