Structural genomic variation leads to unexpected genetic differentiation in Lake Tanganyika’s sardines
| Autor: | Jessica A. Rick, Ismael A. Kimirei, Julieth B. Mosille, Christian Dinkel, Emmanuel A. Sweke, Catherine E. Wagner, Salome Mwaiko, Julian Junker, Ole Seehausen, Bernhard Wehrli, Peter B. McIntyre |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0303 health sciences education.field_of_study Ecology Genomic sequencing Population structure Population Climate change 15. Life on land Biology 010603 evolutionary biology 01 natural sciences Genetic differentiation 03 medical and health sciences Variation (linguistics) Genetic structure Adaptation education 030304 developmental biology |
| DOI: | 10.1101/800904 |
| Popis: | Identifying patterns in genetic structure and the genetic basis of ecological adaptation is a core goal of evolutionary biology and can inform the management and conservation of species that are vulnerable to population declines exacerbated by climate change. We used reduced representation genomic sequencing methods to gain a better understanding of genetic structure among and within populations of Lake Tanganyika’s two sardine species,Limnothrissa miodonandStolothrissa tanganicae. Samples of these ecologically and economically important species were collected across the length of Lake Tanganyika, as well as from nearby Lake Kivu, whereL. miodonwas introduced in 1959. Our results reveal unexpected differentiation within bothS. tanganicaeandL. miodonthat is not explained by geography. Instead, this genetic differentiation is due to the presence of large sex-specific regions in the genomes of both species, but involving different polymorphic sites in each species. Our results therefore indicate rapidly evolving XY sex determination in the two species. Additionally, we found evidence of a large segregating inversion inL. miodon. We found all inversion karyotypes throughout Lake Tanganyika, but the frequencies vary along a north-south gradient, and differ substantially in the introduced Lake Kivu population. We do not find evidence for significant isolation-by-distance, even over the hundreds of kilometers covered by our sampling, but we do find shallow population structure. |
| Databáze: | OpenAIRE |
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