Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow
Abstract Introgressive hybridization may erode phenotypic divergence along environmental gradients, collapsing locally adapted populations into a hybrid swarm. Alternatively, introgression may promote phenotypic divergence by providing variation on which natural selection can act. In freshwater fish...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-10-01
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| Series: | Ecology and Evolution |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ece3.8086 |
| _version_ | 1818567031182589952 |
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| author | Henry K. Baker Danielle C. Hankins Jonathan B. Shurin |
| author_facet | Henry K. Baker Danielle C. Hankins Jonathan B. Shurin |
| author_sort | Henry K. Baker |
| collection | DOAJ |
| description | Abstract Introgressive hybridization may erode phenotypic divergence along environmental gradients, collapsing locally adapted populations into a hybrid swarm. Alternatively, introgression may promote phenotypic divergence by providing variation on which natural selection can act. In freshwater fishes, water flow often selects for divergent morphological traits in lake versus stream habitats. We tested the effects of introgression on lake–stream morphological divergence in the minnow Owens Tui Chub (Siphateles bicolor snyderi), which has been rendered endangered by introgession from the introduced Lahontan Tui Chub (Siphateles bicolor obesa). Using geometric morphometric analysis of 457 individual Tui Chub from thirteen populations, we found that both native and introgressing parent taxa exhibited divergent body and caudal fin shapes in lake versus stream habitats, but their trajectories of divergence were distinct. In contrast, introgressed populations exhibited intermediate body and caudal fin shapes that were not differentiated by habitat type, indicating that introgression has eroded phenotypic divergence along the lentic–lotic gradient throughout the historic range of the Owens Tui Chub. Individuals within hybrid populations were less morphologically variable than those within parent populations, suggesting hybrid adaptation to selective agents other than water flow or loss of variance by drift. |
| first_indexed | 2024-12-14T06:18:14Z |
| format | Article |
| id | doaj.art-48bb8807a9d240ab8141206198b5ace8 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-12-14T06:18:14Z |
| publishDate | 2021-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-48bb8807a9d240ab8141206198b5ace82022-12-21T23:13:58ZengWileyEcology and Evolution2045-77582021-10-011119135931360010.1002/ece3.8086Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnowHenry K. Baker0Danielle C. Hankins1Jonathan B. Shurin2Section of Ecology, Behavior, and Evolution University of California San Diego La Jolla CA USASection of Ecology, Behavior, and Evolution University of California San Diego La Jolla CA USASection of Ecology, Behavior, and Evolution University of California San Diego La Jolla CA USAAbstract Introgressive hybridization may erode phenotypic divergence along environmental gradients, collapsing locally adapted populations into a hybrid swarm. Alternatively, introgression may promote phenotypic divergence by providing variation on which natural selection can act. In freshwater fishes, water flow often selects for divergent morphological traits in lake versus stream habitats. We tested the effects of introgression on lake–stream morphological divergence in the minnow Owens Tui Chub (Siphateles bicolor snyderi), which has been rendered endangered by introgession from the introduced Lahontan Tui Chub (Siphateles bicolor obesa). Using geometric morphometric analysis of 457 individual Tui Chub from thirteen populations, we found that both native and introgressing parent taxa exhibited divergent body and caudal fin shapes in lake versus stream habitats, but their trajectories of divergence were distinct. In contrast, introgressed populations exhibited intermediate body and caudal fin shapes that were not differentiated by habitat type, indicating that introgression has eroded phenotypic divergence along the lentic–lotic gradient throughout the historic range of the Owens Tui Chub. Individuals within hybrid populations were less morphologically variable than those within parent populations, suggesting hybrid adaptation to selective agents other than water flow or loss of variance by drift.https://doi.org/10.1002/ece3.8086body shape evolutioncypriniddivergent selectionhybrid swarmintrogressionlocal adaptation |
| spellingShingle | Henry K. Baker Danielle C. Hankins Jonathan B. Shurin Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow Ecology and Evolution body shape evolution cyprinid divergent selection hybrid swarm introgression local adaptation |
| title | Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| title_full | Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| title_fullStr | Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| title_full_unstemmed | Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| title_short | Introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| title_sort | introgressive hybridization erodes morphological divergence between lentic and lotic habitats in an endangered minnow |
| topic | body shape evolution cyprinid divergent selection hybrid swarm introgression local adaptation |
| url | https://doi.org/10.1002/ece3.8086 |
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