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Non-random dispersal mediates invader impacts on the invertebrate community
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (English)In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 86, no 6, p. 1298-1307Article in journal (Refereed) Published
Abstract [en]

Dispersers are often not a random draw from a population, dispersal propensity being conditional on individual phenotypic traits and local contexts. This non-randomness consequently results in phenotypic differences between dispersers and non-dispersers and, in the context of biological invasions, in an invasion front made of individuals with a biased phenotype. This bias of phenotypes at the front may subsequently modulate the strength of ecological effects of an invasive species on invaded communities. We recently demonstrated that more asocial mosquitofish (Gambusia affinis), one of the 100 worst invasive species, disperse further, suggesting a sociability-biased invasion front. As behavioural types are related to the strength of interspecific interactions, an invasion by a biased subset of individuals should have important ecological implications for native communities. Here, we tested the impact of phenotypic biases in dispersing individuals (relative to non-dispersers) on prey communities in experimental mesocosms. We show that dispersers reduce prey abundance more than do non-dispersers during the first 4 weeks after introduction, and that the disperser's social types are likely drivers of these differences. These differences in prey communities disappeared after 8 weeks suggesting prey community resilience against predation in these mesocosm ecosystems. Consequently, we call for the integration of non-random dispersal, dispersal syndromes and more generally intraspecific variation into studies predicting the impacts of invasions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017. Vol. 86, no 6, p. 1298-1307
Keywords [en]
animal personality, biological invasion, dispersal syndrome, ecological impacts, mosquitofish, social behaviour
National Category
Ecology Zoology
Identifiers
URN: urn:nbn:se:umu:diva-141794DOI: 10.1111/1365-2656.12734ISI: 000413406700003PubMedID: 28857202OAI: oai:DiVA.org:umu-141794DiVA, id: diva2:1161318
Available from: 2017-11-29 Created: 2017-11-29 Last updated: 2018-06-09Bibliographically approved

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Brodin, Tomas

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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  • de-DE
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  • en-US
  • fi-FI
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  • nn-NB
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More languages
Output format
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