Phylogenetic and phylogeographic insights into Sri Lankan killifishes (Teleostei: Aplocheilidae).

Autor: Sudasinghe H; Evolutionary Ecology and Systematics Laboratory, Department of Molecular Biology and Biotechnology, University of Peradeniya, Peradeniya, Sri Lanka.; Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka.; Division of Evolutionary Ecology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.; Naturhistorisches Museum Bern, Bern, Switzerland., Ranasinghe T; Wild Island Foundation, Moratuwa, Sri Lanka., Wijesooriya K; Department of Zoology, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka., Rüber L; Naturhistorisches Museum Bern, Bern, Switzerland.; Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland., Meegaskumbura M; Guangxi Key Laboratory for Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, People's Republic of China.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2024 Jul; Vol. 105 (1), pp. 340-357. Date of Electronic Publication: 2024 May 20.
DOI: 10.1111/jfb.15792
Abstrakt: Three nominal species of the killifish genus Aplocheilus are reported from the lowlands of Sri Lanka. Two of these, Aplocheilus dayi and Aplocheilus werneri, are considered endemic to the island, whereas Aplocheilus parvus is reported from both Sri Lanka and Peninsular India. Here, based on a collection from 28 locations in Sri Lanka, also including a dataset of Asian Aplocheilus downloaded from GenBank, we present a phylogeny constructed from the mitochondrial cytochrome b (cytb), mitochondrial cytochrome c oxidase subunit 1 (cox1), and nuclear recombination activating protein 1 (rag1), and investigate the interrelationships of the species of Aplocheilus in Sri Lanka. The endemic Sri Lankan aplocheilid clade comprising A. dayi and A. werneri is recovered as the sister group to the clade comprising A. parvus from Sri Lanka and Aplocheilus blockii from Peninsular India. The reciprocal monophyly of A. dayi and A. werneri is not supported in our molecular phylogeny. A. dayi and A. werneri display strong sexual dimorphism, but species-level differences are subtle, explained mostly by pigmentation patterns. Their phenotypes exhibit a parapatric distribution and may represent locally adapted forms of a single species. Alternatively, the present study does not rule out the possibility that A. dayi and A. werneri may represent an incipient species pair or that they have undergone introgression or hybridization in their contact zones. We provide evidence that the Nilwala-Gin region of southwestern Sri Lanka may have acted as a drought refugium for these fishes.
(© 2024 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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