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Roles of spatial partitioning, competition, and predation in the North American invasion of an exotic mosquito

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Abstract

Invasion success and species coexistence are often mediated by species interactions across patchily distributed habitats and resources. The invasive mosquito Aedes japonicus japonicus has established in the North American range of the competitively superior resident congener, Aedes albopictus, and the predatory native mosquito Toxorhynchites rutilus. We tested predictions for two hypotheses of invasion success and species coexistence: keystone predation and spatial partitioning. We tested competition between A. japonicus japonicus and A. albopictus with or without T. rutilus in laboratory microcosms, and measured abundances of A. japonicus japonicus, A. albopictus, other resident competing mosquito species, and the presence of T. rutilus among tree holes and tires in metropolitan Washington, DC. In laboratory microcosms, A. albopictus was competitively dominant over A. japonicus japonicus, which is consistent with the few prior studies of competition between these two Aedes species. T. rutilus predation severely lowered performances of both Aedes species but more severely lowered A. japonicus japonicus performance than A. albopictus performance when all three species co-occurred, thus yielding no evidence for keystone predation. Consistent with the spatial partitioning hypothesis, A. japonicus japonicus was negatively correlated and independently aggregated with A. albopictus and all combined resident mosquito competitors and was not associated with T. rutilus among field containers. These results suggest that predation from T. rutilus and competition from A. albopictus are barriers to the spread of A. japonicus japonicus, but that A. japonicus japonicus may escape these interspecific effects by utilizing spatially partitioned container habitats.

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Acknowledgments

We thank B. Kesavaraju; L. McCuiston, Center of Vector Biology; S. A. Juliano, Illinois State University; R. Pozzatti, I. Terry, K. Iwata, N. Kirchoff, and D. Bodner, for useful discussion, for providing us with eggs, for experiment maintenance, or for data collection. We thank S. A. Juliano, S. LaDeau, and B. H. Momen for statistical advice, and two anonymous reviewers for excellent comments. This research was funded by a Maryland Agriculture Experimental Station grant MD-ENST-5739 to P. T. L. and the Washington Biologists Field Club grant to P. T. L. and T. Z. F.

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  1. Department of Environmental Science and Technology, University of Maryland, College Park, College Park, MD, 20742-2315, USA

    T. Z. Freed & P. T. Leisnham

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  1. T. Z. Freed
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Correspondence to P. T. Leisnham.

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Freed, T.Z., Leisnham, P.T. Roles of spatial partitioning, competition, and predation in the North American invasion of an exotic mosquito. Oecologia 175, 601–611 (2014). https://doi.org/10.1007/s00442-014-2909-7

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