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Type: Journal article
Title: Genetic insights into the introduction history of black rats into the eastern Indian Ocean
Author: Thomson, V.A.
Wiewel, A.S.
Palmer, R.
Hamilton, N.
Algar, D.
Pink, C.
Mills, H.
Aplin, K.P.
Clark, G.
Anderson, A.
Herrera, M.B.
Myers, S.
Bertozzi, T.
Piper, P.J.
Suzuki, H.
Donnellan, S.
Citation: Frontiers in Ecology and Evolution, 2022; 9:786510-1-786510-15
Publisher: Frontiers Media SA
Issue Date: 2022
ISSN: 2296-701X
Statement of
Vicki A. Thomson, Andrew S. Wiewel, Russell Palmer, Neil Hamilton, Dave Algar, Caitlyn Pink, Harriet Mills, Ken P. Aplin, Geoffrey Clark, Atholl Anderson, Michael B. Herrera, Steven Myers, Terry Bertozzi, Philip J. Piper, Hitoshi Suzuki, and Steve Donnellan
Abstract: Islands can be powerful demonstrations of how destructive invasive species can be on endemic faunas and insular ecologies. Oceanic islands in the eastern Indian Ocean have suffered dramatically from the impact of one of the world’s most destructive invasive species, the black rat, causing the loss of endemic terrestrial mammals and ongoing threats to ground-nesting birds. We use molecular genetic methods on both ancient and modern samples to establish the origins and minimum invasion frequencies of black rats on Christmas Island and the Cocos-Keeling Islands. We find that each island group had multiple incursions of black rats from diverse geographic and phylogenetic sources. Furthermore, contemporary black rat populations on these islands are highly admixed to the point of potentially obscuring their geographic sources. These hybridisation events between black rat taxa also pose potential dangers to human populations on the islands from novel disease risks. Threats of ongoing introductions from yet additional geographic sources is highlighted by genetic identifications of black rats found on ships, which provides insight into how recent ship-borne human smuggling activity to Christmas Island can negatively impact its endemic species.
Keywords: Rattus rattus; Christmas Island (Indian Ocean); Cocos (Keeling Islands); colonization and extinction; cytochrome b; RAD-seq; hybridisation
Rights: © 2022 Thomson, Wiewel, Palmer, Hamilton, Algar, Pink, Mills, Aplin, Clark, Anderson, Herrera, Myers, Bertozzi, Piper, Suzuki and Donnellan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DOI: 10.3389/fevo.2021.786510
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Appears in Collections:Ecology, Evolution and Landscape Science publications

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