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Season and prey type influence size dependency of predator−prey body mass ratios in a marine fish assemblage Public Deposited

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  • Marine and freshwater food webs are strongly structured by size-dependent predator−prey interactions. Predator−prey body mass ratios (PPMR) are important parameters in size-based food-web models, but studies evaluating the temporal stability of PPMR or its relationship to predator feeding modes are scant. Using a large data set of predator−prey pairs from a diverse fish community sampled in summer, fall, and winter, we showed that community-level PPMR varied with predator mass in a nonlinear (dome-shaped) manner. PPMR was higher in the summer relative to the fall and winter for all predator body size classes regardless of whether prey were fish or invertebrate. Further, the size dependency of PPMR was dome-shaped for invertebrate prey but positive and linear for fish prey. We empirically show that community-level PPMR is dynamic rather than fixed, which is in agreement with general expectations set by simulation studies of biomass spectra. However, we are presently unable to identify the specific processes underlying these patterns. Size-based models of marine ecosystems offer considerable promise over traditional taxa-based approaches, and our analyses provide insight into major patterns of variation in PPMR in a temperate marine system.
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  • Reum JCP, Hunsicker ME (2012) Season and prey type influence size dependency of predator−prey body mass ratios in a marine fish assemblage. Marine Ecology Progress Series 466:167-175
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  • Funding for J.C.P.R. was provided by the Vincent Liguori Fellowship and the University of Washington Climate Impacts Group. Boat time was financed by a University of Washington Research Royalties Fund awarded to T. Essington.
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-11-16T21:10:06Z No. of bitstreams: 1 HunsickerMaryCEOASSeasonPreyType.pdf: 346024 bytes, checksum: 583d7a359279576286f96c4e5b5b2e10 (MD5)
  • description.provenance : Made available in DSpace on 2012-11-16T21:10:06Z (GMT). No. of bitstreams: 1 HunsickerMaryCEOASSeasonPreyType.pdf: 346024 bytes, checksum: 583d7a359279576286f96c4e5b5b2e10 (MD5) Previous issue date: 2012-10-15

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