Diversity and distribution of genetic variation in gammarids: Comparing patterns between invasive and non-invasive species.

Baltazar-Soares, M., Paiva, F., Chen, Y., Zhan, A. and Briski, E., 2017. Diversity and distribution of genetic variation in gammarids: Comparing patterns between invasive and non-invasive species. Ecology and Evolution. (In Press)

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DOI: 10.1002/ece3.3208

Abstract

© 2017 Published by John Wiley & Sons Ltd. Biological invasions are worldwide phenomena that have reached alarming levels among aquatic species. There are key challenges to understand the factors behind invasion propensity of non-native populations in invasion biology. Interestingly, interpretations cannot be expanded to higher taxonomic levels due to the fact that in the same genus, there are species that are notorious invaders and those that never spread outside their native range. Such variation in invasion propensity offers the possibility to explore, at fine-scale taxonomic level, the existence of specific characteristics that might predict the variability in invasion success. In this work, we explored this possibility from a molecular perspective. The objective was to provide a better understanding of the genetic diversity distribution in the native range of species that exhibit contrasting invasive propensities. For this purpose, we used a total of 784 sequences of the cytochrome c oxidase subunit I of mitochondrial DNA (mtDNA-COI) collected from seven Gammaroidea, a superfamily of Amphipoda that includes species that are both successful invaders (Gammarus tigrinus, Pontogammarus maeoticus, and Obesogammarus crassus) and strictly restricted to their native regions (Gammarus locusta, Gammarus salinus, Gammarus zaddachi, and Gammarus oceanicus). Despite that genetic diversity did not differ between invasive and non-invasive species, we observed that populations of non-invasive species showed a higher degree of genetic differentiation. Furthermore, we found that both geographic and evolutionary distances might explain genetic differentiation in both non-native and native ranges. This suggests that the lack of population genetic structure may facilitate the distribution of mutations that despite arising in the native range may be beneficial in invasive ranges. The fact that evolutionary distances explained genetic differentiation more often than geographic distances points toward that deep lineage divergence holds an important role in the distribution of neutral genetic diversity.

Item Type:Article
ISSN:2045-7758
Additional Information:Seventh Framework Programme. Grant Number: 705615; Alexander von Humboldt-Stiftung; National Natural Science Foundation of China
Group:Faculty of Science & Technology
ID Code:29653
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:04 Sep 2017 14:35
Last Modified:04 Sep 2017 14:35

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