Abstract
Introduced mammalian predators have negatively affected native biota and ecological processes in ecosystems across the globe. The least weasel (Mustela nivalis) is a Holarctic mustelid carnivore that has been considered one of the world’s worst invasive alien species. It has been introduced to several islands in the Mediterranean Sea and Atlantic Ocean, and here we present a genetic analysis of these insular populations, based on mitochondrial DNA and microsatellites and building upon a previous Western Palearctic phylogeographic study, with the aim of inferring their origin and introduction history. This is essential information for ecological and evolutionary studies of those populations and our understanding of their impacts on the islands’ biodiversity. Among the Mediterranean insular populations, a substantial mitochondrial subdivision between weasels in Sicily-Corsica and Malta-Sardinia-Balearics is best explained by a dual colonization originating from the Eastern Mediterranean. Given the correspondence between the observed genetic partition and the differential geographic distribution of Greek and Phoenician settlements and influence during the last millennium BC in those islands, we propose that weasels may have been introduced into the first group of islands by the Greeks and into the second group by the Phoenicians. There is strong support that the commercial and demographic expansions of Phoenicians and Greeks allowed the colonization of the western Mediterranean islands by the house mouse, and texts from Classical Antiquity show evidence that weasels were used for rodent control. Thus, weasels may have been intentionally introduced to the islands, with the aim of controlling commensal rodents. Besides indicating Eastern Mediterranean origins for weasels in Mediterranean islands, the mitochondrial data also revealed an unanticipated close genealogical connection between some of these populations and those from the Azores and São Tomé. The latter island populations showed no affinities with weasels from mainland Portugal, contrary to what might have been expected given that these Atlantic islands were settled by the Portuguese. The microsatellite data also supported the relationship between weasels in Atlantic and in Mediterranean islands. Considering geographic proximity and historical information, the most parsimonious explanation for the origin of the Atlantic weasels appears to be introduction from the Balearic Islands to the Azores and from there to São Tomé.
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Acknowledgments
We thank Jean-François Noblet, Wissem Ghawar (Institut Pasteur de Tunis), Maurizio Gattabria (Museo Civico di Zoologia di Roma), Federico Striglioni and Gino Damiani (Parco Nazionale del Gran Sasso e Monti della Laga) and Parco Nazionale d’Abruzzo, Lazio e Molise for providing samples, Fátima Sobral and Ana Simões Nunes (DGV) for kindly providing access to an automated sequencer, and Arlindo Carvalho (São Tomé and Príncipe General-Directorate for the Environment) for the permit to collect and export samples. We also thank Associate Editor Marc Rius and three anonymous reviewers for their helpful comments and suggestions. This study was financed by Portuguese National Funds through Fundação para a Ciência e a Tecnologia (FCT), within the project UID/BIA/00329/2013. MR, RFL and CF acknowledge financial support from Fundação para a Ciência e Tecnologia (FCT, MCTES, Portugal) through, respectively, the PhD fellowship SFRH/BD/60595/2009, the post-doctoral grant SFRH/BPD/91494/2012 and the Ciência 2007 contract C2007-UL-342-CBA1. JM acknowledges support from the Academy of Finland (Grants 200940, 108601 and 118673). ARB acknowledges financial support from the American University in Cairo through a faculty research grant. PJS thanks the Malta Environment and Planning Authority for granting permits to work on the protected Maltese weasel, and Dr. Katrin Fenech and Dr. Nicholas C. Vella for information on the Phoenicians in Malta. SOO acknowledges support from the Turkish National Science Foundation (TUBITAK) through the project 110T930.
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Rodrigues, M., Bos, A.R., Schembri, P.J. et al. Origin and introduction history of the least weasel (Mustela nivalis) on Mediterranean and Atlantic islands inferred from genetic data. Biol Invasions 19, 399–421 (2017). https://doi.org/10.1007/s10530-016-1287-y
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DOI: https://doi.org/10.1007/s10530-016-1287-y
Keywords
- Least weasel
- Mediterranean islands
- Azores
- São Tomé Island
- Genetic markers
- Introduced species