title: Predator-prey body size relationships when predators can consume prey larger than themselves.
abstract: As predator-prey interactions are inherently size-dependent, predator and prey body sizes are key to understanding their feeding relationships. To describe predator-prey size relationships (PPSRs) when predators can consume prey larger than themselves, we conducted field observations targeting three aquatic hemipteran bugs, and assessed their body masses and those of their prey for each hunting event. The data revealed that their PPSR varied with predator size and species identity, although the use of the averaged sizes masked these effects. Specifically, two predators had slightly decreased predator-prey mass ratios (PPMRs) during growth, whereas the other predator specialized on particular sizes of prey, thereby showing a clear positive size-PPMR relationship. We discussed how these patterns could be different from fish predators swallowing smaller prey whole.
authors.affiliation: Center for Ecological Research, Kyoto University, Kyoto, Japan. take.nkzw@gmail.com
authors.forename: Takefumi
authors.initials: T
authors.lastname: Nakazawa
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Ohba
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ushio
mesh_terms: D000818:Animals; D049628:Body Size; D006430:Hemiptera / Q000502:physiology*; D011235:Predatory Behavior
references.citation: Ecol Lett. 2011 Feb;14(2):169-78
references.pmid: 21199248
references.citation: Ecology. 2011 Dec;92(12):2183-9
references.pmid: 22352156
references.citation: Proc Biol Sci. 2006 Jan 7;273(1582):1-9
references.pmid: 16519227
references.citation: Ecology. 2010 Jan;91(1):222-32
references.pmid: 20380211
references.citation: J Anim Ecol. 2011 Mar;80(2):484-94
references.pmid: 21155772
references.citation: Ecology. 2006 Oct;87(10):2411-7
references.pmid: 17089649
references.citation: Proc Natl Acad Sci U S A. 2005 Jan 18;102(3):684-9
references.pmid: 15647346
references.citation: J Anim Ecol. 2008 Jan;77(1):173-83
references.pmid: 18177336