Abstract
The biotas of old islands formed from continental terranes usually have a more complex biogeographical history than those of young oceanic islands, including taxa which have originated by vicariance and/or colonisation, over a variety of timescales. The Tyrrhenian Islands of Corsica, Sardinia and the Tuscan Archipelago in the Mediterranean have a complex geological history, shaped by interactions between the African and Eurasian plates since the Mesozoic. Our understanding of the historical biogeography of Tyrrhenian endemics remains limited for many groups, including freshwater invertebrates. Here we use a time-calibrated phylogeny, derived from mitochondrial and nuclear DNA sequence data, to explore the evolutionary history of Tyrrhenian endemic Hydraena water beetles, an ecologically important group in the islands’ streams. Whilst no endemic Hydraena appear to date from the initial separation of Corsica-Sardinia from the European mainland in the Oligocene, we show that Tyrrhenian species stem from five colonisation events, occurring at different intervals in the last ca. 15 Ma, at least two endemic lineages apparently arising through isolation at the end of the Messinian Salinity Crisis. Hydraena reflexa Rey, 1884, long considered a geographical form or subspecies of the widespread H. pygmaea Waterhouse, 1833, is reinstated as a valid species, endemic to Corsica and Sardinia. H. reflexa can be distinguished from H. pygmaea on external and aedeagal characters, documented here in detail. Specimens of ‘H. reflexa’ from southern continental Italy are shown to differ from those on Corsica and Sardinia, having identical male genitalia to H. pygmaea from elsewhere in its range. Genetically, this Calabrian form also clusters with H. pygmaea, and may have arisen through past introgression between a reflexa-like ancestor and H. pygmaea following the connection of the Calabrian block with the nascent Apennines in the Pliocene. The degree of genetic divergence seen between H. pygmaea and H. reflexa suggests that they diverged approximately 5.5 Ma in the Miocene, following the isolation of Corsico-Sardinian and mainland populations at the end of the Messinian.
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Data availability
DNA sequence data are available on GenBank, new sequences being deposited under accession numbers OR533284-OR533287, OR537346 and OR543921.
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Acknowledgements
DTB and AV are grateful to Alexandra Cieslak for supplying unpublished sequence data for H. pygmaea and H. reflexa following the sad death of Ignacio Ribera in April 2020. We are grateful to Manfred Jäch (NMW), Antoine Mantilleri (MNHN) and Roberto Poggi (MSNG) for allowing us to study material in their care, and to Beatriz Álvarez Dorda and Mercedes París, Museo Nacional de Ciencias Naturales, Madrid for locating the Calabrian specimen of H. pygmaea sequenced by IR. Max Barclay and Robert Angus kindly searched the Natural History Museum, London collections for Waterhouse’s material of H. pygmaea. Diana Arzuza Buelvas (Manchester Museum) and Tony Hunter (National Museums, Liverpool) looked for historical H. pygmaea specimens in their respective institutions. Fieldwork on Corsica by DTB in 2006 was partly supported by a grant from the Leverhulme Trust, UK.
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Ignacio Ribera passed away in 2020, before this work was completed.
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Bilton, D., Ribera, I. & Villastrigo, A. The colonisation of the Tyrrhenian Islands by Hydraena water beetles, with Hydraena reflexa Rey, 1884 reinstated as a valid species endemic to Corsica and Sardinia (Coleoptera, Hydraenidae). Org Divers Evol 23, 881–900 (2023). https://doi.org/10.1007/s13127-023-00620-z
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DOI: https://doi.org/10.1007/s13127-023-00620-z