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- W1664745874 abstract "This thesis examines the foraging behaviour of Carcinus maenas and Cancerpagurus whenpresented with bivalves of contrasting morphology: Mytilus edulis, Ostrea edulis,Crassostrea gigas and Cerastoderma edule. Because foraging may be influenced by therelative abundance and morphological characteristics of both predator and prey, these aspectsare also considered. Chelal size and strength of these crabs and prey shell shape largelydetermined handling techniques. When offered a size range of these bivalves individually,crabs attacked all encountered prey but rejected those that remained unbroken after severalopening attempts, thus, emphasising the passive nature of their size-selective feeding.When offered paired combinations of mussels, oysters and cockles, larger crabs selectedspecies in the ranked order of their profitability. Species-related preferences exhibited bycrabs feeding on prey at or near the optimal size suggest that foraging decisions are partlybased on evaluations of overall prey shape and volume, and that shell width constitutes animportant feature which crabs recognise and associate with prey value.Variations in crab strength relative to size accounted for most intra-specific differences inforaging behaviour. Juvenile C maenas are limited in their choice of prey size, and arethus less species-selective. Adult C maenas are not so constrained, and exhibit a higherdegree of species-selectivity. C. pagurus possesses powerful monomorphic chelae thatoperate at higher mechanical advantage than the cbelae of C maenas, and readily crushedlarger mussels relative to their size. Differences in prey size selection between crab speciesvaried with the species of prey offered, suggesting that certain shell features of these bivalvesconstitute effective barriers to even the powerful chelae of C pagurus. These results arerelevant in the context of aquaculture, since predatory impact on commercially rearedbivalves might be reduced by combining different prey species that offer predatorsalternative or preferred sources of food." @default.
- W1664745874 created "2016-06-24" @default.
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- W1664745874 date "1998-01-01" @default.
- W1664745874 modified "2023-09-24" @default.
- W1664745874 title "Crab foraging behaviour : prey size and species selection in Carcinus maenas (L.) and Cancer pagurus L." @default.
- W1664745874 hasPublicationYear "1998" @default.
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