Patterns and drivers of Nothobranchius killifish diversity in lowland Tanzania

0558502 - ÚBO 2023 RIV US eng J - Článek v odborném periodiku
Reichard, Martin - Janáč, Michal - Blažek, Radim - Žák, Jakub - Alila, O. D. - Polačik, Matej
Patterns and drivers of Nothobranchius killifish diversity in lowland Tanzania.
Ecology and Evolution. Roč. 12, č. 6 (2022), č. článku e8990. ISSN 2045-7758. E-ISSN 2045-7758
Grant CEP: GA ČR GA19-01781S
Institucionální podpora: RVO:68081766
Klíčová slova: Africa * Cyprinodontiformes * dispersal * ephemeral habitats * habitat protection
Obor OECD: Zoology
Impakt faktor: 2.6, rok: 2022
Způsob publikování: Open access
https://onlinelibrary.wiley.com/doi/epdf/10.1002/ece3.8990

Temporary pools are seasonal wetland habitats with specifically adapted biota, including annual Nothobranchius killifishes that survive habitat desiccation as diapausing eggs encased in dry sediment. To understand the patterns in the structure of Nothobranchius assemblages and their potential in wetland conservation, we compared biodiversity components (alpha, beta, and gamma) between regions and estimated the role and sources of nestedness and turnover on their diversity. We sampled Nothobranchius assemblages from 127 pools across seven local regions in lowland Eastern Tanzania over 2 years, using dip net and seine nets. We estimated species composition and richness for each pool, and beta and gamma diversity for each region. We decomposed beta diversity into nestedness and turnover components. We tested nestedness in three main regions (Ruvu, Rufiji, and Mbezi) using the number of decreasing fills metric and compared the roles of pool area, isolation, and altitude on nestedness. A total of 15 species formed assemblages containing 1-6 species. Most Nothobranchius species were endemic to one or two adjacent regions. Regional diversity was highest in the Ruvu, Rufiji, and Mbezi regions. Nestedness was significant in Ruvu and Rufiji, with shared core (N. melanospilus, N. eggersi, and N. janpapi) and common (N. ocellatus and N. annectens) species, and distinctive rare species. Nestedness apparently resulted from selective colonization rather than selective extinction, and local species richness was negatively associated with altitude. The Nothobranchius assemblages in the Mbezi region were not nested, and had many endemic species and the highest beta diversity driven by species turnover. Overall, we found unexpected local variation in the sources of beta diversity (nestedness and turnover) within the study area. The Mbezi region contained the highest diversity and many endemic species, apparently due to repeated colonizations of the region rather than local diversification. We suggest that annual killifish can serve as a flagship taxon for small wetland conservation.
Trvalý link: http://hdl.handle.net/11104/0332142


Vědecká data: Dryad