Community-wide distribution of predator-prey interaction strength in kelp forests

Proceedings of the National Academy of Sciences of the United States of America
Enric Sala, Michael H Graham

Abstract

The strength of interactions between predators and their prey (interaction strength) varies enormously among species within ecological communities. Understanding the community-wide distribution of interaction strengths is vital, given that communities dominated by weak interactions may be more stable and resistant to invasion. In the oceans, previous studies have reported log-normal distributions of per capita interaction strength. We estimated the distribution of predator-prey interaction strengths within a subtidal speciose herbivore community (45 species). Laboratory experiments were used to determine maximum per capita interaction strengths for eight species of herbivores (including amphipods, isopods, gastropods, and sea urchins) that graze on giant kelp (Macrocystis pyrifera) microscopic stages. We found that maximum per capita interaction strength saturated as a function of individual herbivore biomass, likely caused by predator/prey size thresholds. Incorporating this nonlinearity, we predicted maximum per capita interaction strength for the remaining herbivore species. The resulting distribution of per capita interaction strengths was bimodal, in striking contrast to previous reports from other communities. Although sm...Continue Reading

References

Jun 17, 1998·Proceedings of the National Academy of Sciences of the United States of America·J L Ruesink

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Citations

Nov 1, 2008·Oecologia·Rebecca L Kordas, Steve Dudgeon
May 12, 2011·Integrative and Comparative Biology·Felicia C Coleman, Christopher C Koenig
Sep 23, 2011·Proceedings. Biological Sciences·James C StegenBrian J Enquist
May 17, 2013·Proceedings. Biological Sciences·Sarah C L KnowlesAmy B Pedersen
Nov 22, 2011·Biological Reviews of the Cambridge Philosophical Society·Kevin E McCluneyBlair O Wolf
Nov 3, 2007·Ecological Applications : a Publication of the Ecological Society of America·Jason S Link
Jan 17, 2008·The American Naturalist·Nadiah P Kristensen
Feb 26, 2013·Ecology·Levi S Lewis, Todd W Anderson
Sep 15, 2009·Ecology Letters·James C StegenRegis Ferriere
May 30, 2012·Environmental Microbiology·Hugo Sarmento, Josep M Gasol
Mar 5, 2015·Ecology Letters·Diego P VázquezFernanda S Valdovinos
Dec 17, 2014·Ecology and Evolution·Guilherme O LongoSergio R Floeter
Dec 13, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Alessandro FiasconaroEwa Gudowska-Nowak
Apr 30, 2020·Proceedings. Biological Sciences·Lars GutowMartin Thiel
Apr 20, 2020·Oecologia·Crystal A Ng, Fiorenza Micheli

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