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Title Does predator-driven, biotic resistance limit the northward spread of the non-native green porcelain crab, Petrolisthes armatus?
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Biotic resistance by native predators can limit the geographic range and abundance of nonnative species following introduction into an ecosystem. Here we tested the hypothesis that the strength ofpredation pressure varies with latitude and limits the abundance and northward expansion of the non-native green porcelain crab, Petrolisthes armatus, whose northern range is also hypothesized to be limited by physical tolerances to cold temperatures. We quantified the predation risk of P. armatus across 400 km of the crab's invasive range along the coastline of the southeastern US. In addition, we measured the density of large P. armatus, habitat quality, and other environmental factors that may affect the crab's predation risk. Finally, we conducted a size-selective predator exclusion experiment to determine the predator species and size classes that may be consuming P. armatus. Results indicated that neither the density of large P. armatus nor its predation risk varied systematically with latitude. Instead, variation in predation risk was best explained by local site-level differences in habitat quality, the density of large P. armatus, and the mean abundance of predators. The predator exclusion experiment indicated that both small and large size classes of predators are capable of equallystrong rates of predation on P. armatus. Together, our results suggest that although native predators readily consume P. armatus, they do not provide biotic resistance against its northward expansion. Instead, it seems likely that other latitudinally differential factors like low winter temperatures that decrease P. armatus survival are more influential in limiting the crab's northern expansion.

Contributors Kaitlin A. Kinney, Lauren M. Pintor and James Byers

Kinney, K.A., Pintor, L.M. and Byers, J. 2019. Does predator-driven, biotic resistance limit the northward spread of the non-native green porcelain crab, Petrolisthes armatus? Biological Invasions. 21:245-260. (DOI: 10.1007/s10530-018-1821-1)

Key Words Density dependence, Enemy release hypothesis, Limiting factors, Range expansion, SINERR Publication, Student Publication, Top-down effects, Trophic interactions
File Date 2019
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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959, OCE-1237140 and OCE-1832178. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.