| Autor: |
Eshenroder, Randy L., Breckenridge, Andy J., Jacobson, Peter C. |
| Zdroj: |
Transactions of the American Fisheries Society; Jan2024, Vol. 153 Issue 1, p23-38, 16p |
| Abstrakt: |
Objective: We propose that deepwater Cisco Coregonus artedi (sensu lato) survived Wisconsin ice advances through introgression with shallow‐water Cisco ~65 ka followed by expression of introgressed genomic fragments after the last retreat of ice from the Great Lakes ~15 ka. Methods: We reviewed Wisconsin Glaciation in relation to putative introgression within Cisco and employed a phylogeographic approach to substantiate locations of Cisco refugia and the implications for dispersal of Cisco ahead of the last advance of Wisconsin ice. Result: We showed that deepwater Cisco, in contrast to shallow‐water Cisco, were very unlikely to have survived glacial advances and that a massive introgression event between both types likely occurred as the first of two Wisconsin ice advances reached the Great Lakes ~65 ka. Conclusion: The most‐parsimonious explanation for the distribution of deepwater Cisco involves long‐ago introgression as a precursor to its divergence from shallow‐water Cisco following the final retreat of Wisconsin ice. Impact statementThis study will impact management of a group of fishes called ciscoes that once were prominent in every Great Lake. Ciscoes were depleted everywhere but in Lake Superior due to overfishing, pollution, and introduced species, but efforts are ongoing to restore them by stocking from areas where they persist. Picking the right donor populations is essential if restoration is to be successful, and this study expands the field of candidate donors by showing that hybridized populations are a normal feature of cisco biology. Hybridization, which is conventionally viewed as impairing fitness in most fish populations, was shown in this study to be an adaptation by ciscoes to their near extinction by advancing ice sheets during the Ice Age. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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