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Complex consequences of increased density for reproductive output in an invasive freshwater snail

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Abstract

Population density can have profound, often negative effects on fitness-related traits and population dynamics, and density dependence is of central importance to many prominent ecological and evolutionary hypotheses. Here, we used experimental manipulations of food, population density, and water conditioning to characterize the mechanisms underlying reproductive density-dependence in Potamopyrgus antipodarum. This New Zealand freshwater snail is a prominent model system for invasion biology, ecotoxicology, and the maintenance of sexual reproduction. We demonstrated that a primary source of negative density-dependence is food limitation, but surprisingly, we found that P. antipodarum reproductive output was much higher in high density versus low-density conditions when food was adequate. We then used manipulations of water environment to demonstrate that these positive effects of high density are likely caused by a waterborne substance produced by P. antipodarum. Altogether, these results indicate that there are strong and complex connections between food availability, density, and reproductive output in this important model system that could influence the dynamics of invasive populations, the costs and benefits of sex, and the approaches used for ecotoxicology studies.

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Acknowledgments

We thank Curt Lively and Britt Koskella for snail donations, Katelyn Larkin, Andy Thompson, Claire Tucci, and other members of the Neiman lab for help with snail maintenance and data collection, Bennett Brown, Steve Hendrix, and Joel Sharbrough for helpful discussions, and Andrew Forbes, Steve Hendrix, Hang Lim, Dorota Paczesniak, and Joel Sharbrough for comments on an earlier version of the manuscript. We also acknowledge John Endler, F. Xavier Picó, Martin Haase, and an anonymous reviewer for very constructive criticism and suggestions that much improved the manuscript. This research was funded by the Secondary Student Training Program at the University of Iowa, the Iowa Center for Research by Undergraduates, and by the Research Council of Norway.

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Correspondence to Maurine Neiman.

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Neiman, M., Warren, D., Rasmussen, B. et al. Complex consequences of increased density for reproductive output in an invasive freshwater snail. Evol Ecol 27, 1117–1127 (2013). https://doi.org/10.1007/s10682-013-9632-4

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