Density of an intraguild predator mediates feeding group size, intraguild egg predation, and intra- and interspecific competition

Oecologia
Louise A BurleyJames W Petranka

Abstract

Intraguild predation (IGP) is common in most communities, but many aspects of density-dependent interactions of IG predators with IG prey are poorly resolved. Here, we examine how the density of an IG predator can affect feeding group size, IG egg predation, and the growth responses of IG prey. We used laboratory feeding trials and outdoor mesocosm experiments to study interactions between a social intraguild predator (larvae of the wood frog; Rana sylvatica) and its prey (spotted salamander; Ambystoma maculatum). Larvae of R. sylvatica could potentially affect A. maculatum by consuming shared larval food resources or by consuming eggs and hatchlings. However, successful egg predation requires group feeding by schooling tadpoles. We established from five to 1,190 hatchlings of R. sylvatica in mesocosms, then added either 20 A. maculatum hatchlings to study interspecific competition, or a single egg mass to examine IGP. Crowding strongly suppressed the growth of R. sylvatica, and IGP was restricted to the egg stage. In the larval competition experiment, growth of A. maculatum was inversely proportional to R. sylvatica density. In the predation experiment, embryonic mortality of A. maculatum was directly proportional to the initi...Continue Reading

Citations

Jul 9, 2011·Oecologia·Wen-San Huang, David A Pike
Oct 18, 2015·Experimental & Applied Acarology·Yasuyuki ChohArne Janssen
Jun 3, 2015·Environmental Toxicology and Chemistry·Kacey L DananayMichael F Benard
Apr 9, 2010·Proceedings. Biological Sciences·W Alice BoyleChristopher G Guglielmo

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