biostudies-literaturePiette-Lauziere GGreat Lakes Fishery Commission9654-9670https://www.ebi.ac.uk/biostudies/studies/S-EPMC6745834biostudies-literatureUnknown9(17)The diversity of Laurentian Great Lakes ciscoes (<i>Coregonus artedi</i>, sensu lato) arose via repeated local adaptive divergence including deepwater ciscoes that are now extirpated or threatened. The <i>nigripinnis</i> form, or Blackfin Cisco, is extirpated from the Great Lakes and remains only in Lake Nipigon. Putative <i>nigripinnis</i> populations were recently discovered in sympatry with <i>artedi</i> in a historical drainage system of glacial Lake Algonquin, the precursor of lakes Michigan and Huron. Given the apparent convergence on Great Lakes form, we labeled this form blackfin. Here, we test the hypothesis that <i>nigripinnis</i> may have colonized this area from the Great Lakes as a distinct lineage. It would then represent a relict occurrence of the historical diversity of GreEcology and evolutionEvolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin.PMC67458342016-RID-44054Turgeon JPiette-Lauziere GBell AHRidgway MSfalseEvolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin.The diversity of Laurentian Great Lakes ciscoes (<i>Coregonus artedi</i>, sensu lato) arose via repeated local adaptive divergence including deepwater ciscoes that are now extirpated or threatened. The <i>nigripinnis</i> form, or Blackfin Cisco, is extirpated from the Great Lakes and remains only in Lake Nipigon. Putative <i>nigripinnis</i> populations were recently discovered in sympatry with <i>artedi</i> in a historical drainage system of glacial Lake Algonquin, the precursor of lakes Michigan and Huron. Given the apparent convergence on Great Lakes form, we labeled this form blackfin. Here, we test the hypothesis that <i>nigripinnis</i> may have colonized this area from the Great Lakes as a distinct lineage. It would then represent a relict occurrence of the historical diversity of Gre2019-01-01T00:00:00Z2019 Sep2025-04-04T23:22:05.036Z2019-09-26T07:06:35ZS-EPMC67458343153468310.1002/ece3.5496