Historical biogeography of herbivorous coral reef fishes: the formation of an Atlantic fauna

Siqueira, Alexandre C., Bellwood, David R., and Cowman, Peter F. (2019) Historical biogeography of herbivorous coral reef fishes: the formation of an Atlantic fauna. Journal of Biogeography, 46 (7). pp. 1611-1624.

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Abstract

Aim: To describe the global biogeography of key herbivorous coral reef fish groups since their presumed origins, using data from both fossil and extant species.

Location: Global Cenozoic reefs.

Taxon: Acanthuridae (surgeonfishes), Siganidae (rabbitfishes) and Scarini (parrotfishes).

Methods: We applied the fossilized birth-death model to build chronograms including a comprehensive sampling of extant species and all the fossil occurrences described for each group. With the resulting chronograms, we built biogeographical models considering the geological changes in reef habitat availability since the ancient Tethys Sea. Finally, we used biogeographical stochastic mappings to trace the routes of colonization of the Atlantic Ocean by lineages in our focal taxa.

Results: We found that the Palaeocene-Eocene was a period of significant lineage origination for surgeonfishes and rabbitfishes in the central Tethys Sea with the appearance of ancient genera. Most of these genera were probably extinct by the Eocene-Oligocene boundary as they do not correspond with modern taxa. Parrotfishes, however, originated in the early Oligocene, an epoch that corresponds with the geographical transition of the marine biodiversity hotspot. In all groups, extant genera had similar origin times and all expanded in the Miocene, mainly in the Indo-Pacific. In the Atlantic, only one parrotfish lineage with Tethyan ancestry appears to have survived. It subsequently gave rise to extant endemic genera (Sparisoma and Cryptotomus). The other extant lineages in the Atlantic all have Indo-Pacific origins and colonized more recently using different dispersal pathways.

Main conclusions: The Indo-Pacific herbivorous fish fauna is the result of ongoing lineage expansion that started in the central Tethys. The Atlantic is a composite fauna with just one endemic lineage and at least four colonization events from the Indo-Pacific.

Item ID: 59964
Item Type: Article (Research - C1)
ISSN: 1365-2699
Keywords: Atlantic, fossilized birth-death, Indo-Pacific, parrotfishes, rabbitfishes, surgeonfishes, Tethys
Copyright Information: © 2019 John Wiley & Sons Ltd.
Funders: Australian Research Council, James Cook University (JCU)
Projects and Grants: JCU Postgraduate Research Scholarship
Research Data: http://doi.org/10.25903/5cd265eb0a405
Date Deposited: 31 Jul 2019 07:32
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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