| Title | Environmental selection and gene flow jointly determine the population genetic diversity and structure of Diaphanosoma dubium along a watershed elevation |
| Abstract | Biodiversity of local communities has been found to generally decrease with elevation. However, the elevational patterns of intraspecific genetic diversity remain unclear, especially in passive dispersers and species with short life histories. In this study, we investigated the populations of a tropical dominant Cladoceran, Diaphanosoma dubium, along elevation in the largest watershed of South China. The studied populations were grouped into four regional groups based on elevation and habitat connectivity. No significant elevation pattern was observed for mitochondrial genetic diversity, but nuclear diversity was influenced by habitat type. The haplotype network showed a radial pattern with a common haplotype at the centre, and many private haplotypes existed in each regional group. Four clusters of D. dubium populations were identified and exactly corresponding to the four investigated regions, indicating a strong spatial genetic structure. Weak but significant isolation by distance (IBD) supported the critical role of environmental selection with elevation. Precipitation significantly explained population genetic variation at the watershed scale. Bidirectional gene flow was a common pattern that occurred among the four regional groups. Our results highlight that habitat selection with gene flow plays an important role in shaping the genetic pattern of tropical freshwater Cladocera along an elevational gradient. |
| Source | Global Ecology and Conservation 49 (e02773) |
| Keywords | cladocera |
| Journal | Global Ecology and Conservation |
| Editor | Elsevier, Amsterdam, Paesi Bassi |
| Year | 2024 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.gecco.2023.e02773 |
| Authors | Jian Liao, Shu Chen, Ping Liu, Diego Fontaneto, Bo-Ping Han |
| Text | 490230 2024 10.1016/j.gecco.2023.e02773 cladocera Environmental selection and gene flow jointly determine the population genetic diversity and structure of Diaphanosoma dubium along a watershed elevation Jian Liao, Shu Chen, Ping Liu, Diego Fontaneto, Bo Ping Han Department of Ecology, Institute of Hydrobiology, Jinan University, Guangzhou 510632, China Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China National Research Council of Italy CNR , Water Research Institute IRSA , Molecular Ecology Group MEG , Largo Tonolli 50, I 28922 Verbania Pallanza, Italy Biodiversity of local communities has been found to generally decrease with elevation. However, the elevational patterns of intraspecific genetic diversity remain unclear, especially in passive dispersers and species with short life histories. In this study, we investigated the populations of a tropical dominant Cladoceran, Diaphanosoma dubium, along elevation in the largest watershed of South China. The studied populations were grouped into four regional groups based on elevation and habitat connectivity. No significant elevation pattern was observed for mitochondrial genetic diversity, but nuclear diversity was influenced by habitat type. The haplotype network showed a radial pattern with a common haplotype at the centre, and many private haplotypes existed in each regional group. Four clusters of D. dubium populations were identified and exactly corresponding to the four investigated regions, indicating a strong spatial genetic structure. Weak but significant isolation by distance IBD supported the critical role of environmental selection with elevation. Precipitation significantly explained population genetic variation at the watershed scale. Bidirectional gene flow was a common pattern that occurred among the four regional groups. Our results highlight that habitat selection with gene flow plays an important role in shaping the genetic pattern of tropical freshwater Cladocera along an elevational gradient. 49 Published version https //www.sciencedirect.com/science/article/pii/S2351989423004080 bop 2024_GlobEcolCons_Liao et al.pdf Articolo in rivista Elsevier 2351 9894 Global Ecology and Conservation Global Ecology and Conservation Global Ecology and Conservation GECCO diego.fontaneto FONTANETO DIEGO |
