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• W2045013622 abstract "We used microscopic video records to analyse the behaviour of mud crab megalopae (Scylla paramamosain) fed on rotifers (Brachiomus spp.), Artemia sp. or copepods (Schmackeria dubin). The megalopae were able to capture prey whose sizes ranged from no larger than Artemia nauplii to no smaller than adult Artemia. The megalopae employed three feeding modes: (1) Ambush-Prey mode, (2) Swim-Suspension-Feed mode and (3) Sit-Sweep mode. These involved raptorial feeding, suspension feeding and an in-between raptorial-suspension feeding mode, depending on the size of the prey and their density in the surrounding water. The chelipeds played an important role in feeding. Megalopae used the chelipeds to grip or sweep prey items and their movement generated eddies that can increase feeding efficiency. To verify the contribution of the chelipeds to feeding efficiency, we observed and compared the animals under three cheliped treatment regimes: (1) Autotomized – chelipeds removed by induced autotomy; (2) Glued – chelipeds glued at the dactylus-propodus joint to eliminate their ability to grip; and (3) Control – normal chelipeds. The feeding rates of the autotomized and glued treatments were lower than those of the controls, demonstrating that the chelipeds assist in feeding but that the megalopae can still feed without them. The density of prey also affected feeding efficiency. Feeding rate and prey density were positively correlated. When prey density was high, megalopae were able to feed in excess of their nutritional requirements. The study shows that mud crab megalopae respond flexibly to variations in feeding conditions, such as damaged chelipeds, as well as prey size and density. We postulate that this plasticity evolved in response to the dilute and patchy prey conditions of the estuarine environment. All the analysed behaviours are illustrated with video sequences." @default.
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• W2045013622 date "2013-09-01" @default.
• W2045013622 modified "2023-10-18" @default.
• W2045013622 title "Feeding in the megalopae of the mud crab (<i>Scylla paramamosain</i>): mechanisms, plasticity, role of chelipeds and effect of prey density" @default.
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• W2045013622 doi "https://doi.org/10.1080/10236244.2013.833365" @default.
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