Limited dispersal and in situ diversification drive the evolutionary history of Rasborinae fishes in Sundaland

Sholihah, Arni; Delrieu‐Trottin, Erwan; Sukmono, Tedjo; Dahruddin, Hadi; Pouzadoux, Juliette; Tilak, Marie‐Ka; Fitriana, Yuli; Agnèse, Jean‐François; Condamine, Fabien L.; Wowor, Daisy; Rüber, Lukas; Hubert, Nicolas (2021). Limited dispersal and in situ diversification drive the evolutionary history of Rasborinae fishes in Sundaland. Journal of biogeography, 48(9), pp. 2153-2173. Wiley 10.1111/jbi.14141

Text Sholihah_et_al._2021_JBiogeo_Limited_dispersal_and_in_situ_diversification_drive_the_evolutionary_history_of_Rasborinae_fishes_in_Sundaland.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (5MB) | Request a copy

Aim: Sea-level changes have long been put forward to explain the colonization of
Southeast Asian islands by freshwater aquatic organisms. We examined the relative
impact of Sundaland geology since the Oligocene and of Pleistocene Eustatic
Fluctuations on the mitochondrial lineage diversification of a species-rich subfamily of freshwater fishes widely distributed in Southeast Asia. We specifically tested if the
expansion of exposed lands and increased island connectivity during Pleistocene low
sea levels (the paleoriver hypothesis) induced bursts of diversification.
Location: Sundaland.
Taxon: Rasborinae (Actinopterygii, Cypriniformes, Danionidae).
Methods: We aggregated 1,017 cytochrome oxidase I sequences and 79 mitogenomes
to delineate Molecular Operational Taxonomic Units (MOTUs) and further reconstruct a time-calibrated phylogeny of Rasborinae. Ancestral area estimations were conducted using both island and paleoriver partitioning to examine the impact of island connectivity during Pleistocene sea-level changes on dispersal. Temporal trends of diversification are explored through statistical selection of best-fit models.
Results: The origin of Sundaland mitochondrial lineages is dated at c. 33 Ma and four
major clades are identified, which diversified between c. 31 and 22 Ma. The Island
of Borneo and North Sunda paleoriver are identified as the source of Sundaland
Rasborinae. Geographical patterns of lineage divergence indicate that most divergence
events occurred within islands and diversification under constant birth rate
models are the most likely for all clades.

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