Using functional responses and prey switching to quantify invasion success of the Pacific oyster, Crassostrea gigas

Patrick W.S. Joyce, James W.E. Dickey, Ross N. Cuthbert, Jaimie T.A. Dick, Louise Kregting

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
102 Downloads (Pure)

Abstract

Invasive alien species continue to proliferate and cause severe ecological impacts. Functional responses (FRs) have shown excellent utility in predicting invasive predator success, however, their use in predicting invasive prey success is limited. Here, we assessed invader success by quantifying FRs and prey switching patterns of two native predators, the common sea star, Asterias rubens, and the green crab, Carcinus maenas, towards native blue mussels, Mytilus edulis, and invasive Pacific oysters, Crassostrea gigasAsterias displayed destabilising type II FRs, whereas Carcinus displayed stabilising type III FRs towards both prey species. Both predators exhibited greater search efficiencies and maximum feeding rates towards native compared to invasive prey. Both predators disproportionately consumed native mussels over invasive oysters when presented simultaneously, even when native mussels were rare in the environment, therefore indicating negligible prey switching. We demonstrate that invasion success may be mediated through differential levels of biotic resistance exerted by native predators.
Original languageEnglish
JournalMarine environmental research
Early online date21 Feb 2019
DOIs
Publication statusEarly online date - 21 Feb 2019

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