The influence of size-specific indirect interactions in predator-prey systems

Ecology
Volker H W Rudolf

Abstract

Nonlethal indirect interactions between predators often lead to nonadditive effects of predator number on prey survival and growth. Previous studies have focused on systems with at least two different predator species and one prey species. However, most predators undergo extreme ontological changes in phenotype such that interactions between different-sized cohorts of a predator and its prey could lead to nonadditive effects in systems with only two species. This may be important since different-sized individuals of the same species can differ more in their ecology than similar-sized individuals of different species. This study examined trait-mediated indirect effects in a two-species system including a cannibalistic predator with different-sized cohorts and its prey. I tested for these effects using larvae of two stream salamanders, Gyrinophilus porphyriticus (predator) and Eurycea cirrigera (prey), by altering the densities and combinations of predator size classes in experimental streams. Results showed that the presence of large individuals can significantly reduce the impact of density changes of smaller conspecifics on prey survival through nonlethal means. In the absence of large conspecifics, an increase in the relative...Continue Reading

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Citations

Aug 12, 2008·Oecologia·Volker H W Rudolf, Joanna Armstrong
Nov 27, 2008·Oecologia·Pavel KratinaBradley R Anholt
Dec 9, 2009·Ecology·Osamu KishidaTakayuki Ohgushi
Jun 23, 2009·Ecology·Osamu KishidaKinya Nishimura
Sep 18, 2015·Ecology·Kunio Takatsu, Osamu Kishida
Jun 18, 2011·Trends in Ecology & Evolution·Tom E X Miller, Volker H W Rudolf
Mar 29, 2008·Ecology Letters·Sebastian Schreiber, Volker H W Rudolf
Jun 15, 2011·The Journal of Animal Ecology·Osamu KishidaKinya Nishimura
Jun 10, 2014·The Journal of Animal Ecology·Lauren Krenek, Volker H W Rudolf
Jan 7, 2018·Oecologia·Robert E Clark, Michael S Singer
Sep 3, 2018·Oecologia·Morgana Maria FonsecaArne Janssen
Mar 24, 2021·Ecology Letters·Mike BootsVolker Rudolf
Mar 12, 2021·The Journal of Animal Ecology·Volker H W Rudolf, Lauren Eveland
May 4, 2021·Ecological Applications : a Publication of the Ecological Society of America·Ricardo Perez-AlvarezKatja Poveda

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