Journal
JOURNAL OF FISH BIOLOGY
Volume 83, Issue 5, Pages 1183-1196Publisher
WILEY
DOI: 10.1111/jfb.12213
Keywords
food distribution; foraging; growth hormone; predation risk; transgene
Categories
Funding
- National Natural Science Foundation of China [31200423, 30970553]
- Development Plan of the State Key Fundamental Research of China [2009CB119205]
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The competitive ability and habitat selection of juvenile all-fish GH-transgenic common carp Cyprinus carpio and their size-matched non-transgenic conspecifics, in the absence and presence of predation risk, under different food distributions, were compared. Unequal-competitor ideal-free-distribution analysis showed that a larger proportion of transgenic C. carpio fed within the system, although they were not overrepresented at a higher-quantity food source. Moreover, the analysis showed that transgenic C. carpio maintained a faster growth rate, and were more willing to risk exposure to a predator when foraging, thereby supporting the hypothesis that predation selects against maximal growth rates by removing individuals that display increased foraging effort. Without compensatory behaviours that could mitigate the effects of predation risk, the escaped or released transgenic C. carpio with high-gain and high-risk performance would grow well but probably suffer high predation mortality in nature. (C) 2013 The Fisheries Society of the British Isles
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