Glacial vicariance and secondary contact shape demographic histories in a freshwater mussel species complex
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Abstract
Characterizing the mechanisms influencing the distribution of genetic variation in aquatic species can be difficult due to the dynamic nature of hydrological landscapes. In North America’s Central Highlands, a complex history of glacial dynamics, long-term isolation, and secondary contact have shaped genetic variation in aquatic species. Although the effects of glacial history have been demonstrated in many taxa, responses are often lineage- or species-specific and driven by organismal ecology. In this study, we reconstruct the evolutionary history of a freshwater mussel species complex using a suite of mitochondrial and nuclear loci to resolve taxonomic and demographic uncertainties. Our findings do not support Pleurobema rubrum as a valid species, which is proposed for listing as threatened under the U.S. Endangered Species Act. We synonymize P. rubrum under Pleurobema sintoxia—a common and widespread species found throughout the Mississippi River Basin. Further investigation of patterns of genetic variation in P. sintoxia identified a complex demographic history, including ancestral vicariance and secondary contact, within the Eastern Highlands. We hypothesize these patterns were shaped by ancestral vicariance driven by the formation of Lake Green and subsequent secondary contact after the last glacial maximum. Our inference aligns with demographic histories observed in other aquatic taxa in the region and mirrors patterns of genetic variation of a freshwater fish species (Erimystax dissimilis) confirmed to serve as a parasitic larval host for P. sintoxia. Our findings directly link species ecology to observed patterns of genetic variation and may have significant implications for future conservation and recovery actions of freshwater mussels.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Glacial vicariance and secondary contact shape demographic histories in a freshwater mussel species complex |
| Series title | Journal of Heredity |
| DOI | 10.1093/jhered/esad075 |
| Volume | 115 |
| Issue | 1 |
| Publication Date | November 28, 2023 |
| Year Published | 2024 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Wetland and Aquatic Research Center, Eastern Ecological Science Center |
| Description | 14 p. |
| First page | 72 |
| Last page | 85 |
| Country | United States |
| Other Geospatial | Mississippi River basin |