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Biological Invasions

, Volume 17, Issue 5, pp 1383–1395 | Cite as

Non-linear effects of invasive lionfish density on native coral-reef fish communities

  • Cassandra E. BenkwittEmail author
Original Paper

Abstract

One of the major goals of invasion biology is predicting the effects of invaders on native species, which is often accomplished by linearly scaling-up per-capita effects with invader abundance. However, the relationship between invader density and their ecological impact is poorly understood, and it is likely that the effects of invasive species scale non-linearly with increasing invader density. The Pacific red lionfish (Pterois volitans) is an invasive predator that has reached high abundances throughout the tropical and sub-tropical western Atlantic, Caribbean, and Gulf of Mexico. A single lionfish can have extremely large effects on native reef-fish communities, yet the relationship between lionfish density and their ecological effects is not well known. I manipulated juvenile lionfish densities on small patch reefs in the Bahamas and monitored the subsequent effects on native coral-reef fish abundance, biomass, richness, evenness, composite diversity, and community structure over 7 weeks. Native fish abundance and biomass decreased non-linearly with increasing lionfish density, with the largest drops in abundance and biomass at low lionfish densities and their effects leveling off at high densities. Lionfish density also significantly affected richness and community structure, but these effects could not be clearly classified as either linear or non-linear. Evenness and composite diversity were not significantly affected by lionfish density. Given that the effects of lionfish on native fish abundance and biomass level-off at high lionfish densities, it appears important to remove all lionfish from small patch reefs to have the biggest influence on conserving the native community.

Keywords

Ecological impacts Non-native Predator–prey Species diversity Coral reefs Pterois volitans 

Notes

Acknowledgments

This work was supported by National Science Foundation (NSF) Grants (08-51162 and 12-33027) to M.A. Hixon and an NSF Graduate Research Fellowship to C.E. Benkwitt. This paper is a chapter of my doctoral dissertation (Committee: M.A. Hixon [advisor], S.A. Heppell, S.S. Heppell, L. Madsen, and B.A. Menge). B. Beechler, E. Cerny-Chipman, S.L. Close, A.C.D. Davis, E. Gorsich, S.J. Green, K.I. Ingeman, A.C. Iles, T.L. Kindinger, T.J. Pusack, and L.J. Tuttle also provided constructive feedback on parts of this manuscript. I also thank M.A. Albins for assistance with R code, A. Adler for verifying biomass conversions, M. Crell and S. Vojnovich for data entry, and A.C.D. Davis, T.J. Pusack, K.I. Ingeman, T.L. Kindinger, L.J. Tuttle, and the Perry Institute for Marine Science staff and interns for field assistance and support.

Supplementary material

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Supplementary material 1 (PDF 1553 kb)
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Supplementary material 2 (PDF 49 kb)
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Supplementary material 3 (PDF 82 kb)
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Supplementary material 4 (PDF 74 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Department of Integrative BiologyOregon State UniversityCorvallisUSA

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