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Material Information
- Title:
- Modulation of attack behavior and its effect on feeding performance in a tropic generalist fish Hexagrammos decagrammus
- Creator:
- Nemeth, Donna
- Place of Publication:
- Great Britain
- Publisher:
- The Company of Biologists Limited
- Publication Date:
- 1997
- Language:
- English
- Physical Description:
- pages 2155-2164 : illustrations.
Notes
- Abstract:
- This study examines the ability of a temperate marine fish, Hexagrammos decagrammus, to modulate its preycapture behavior in response to differences in prey type.This species has an extremely broad diet, feeding on prey which demonstrate very different anti-capture behaviors.Video-taped attacks on three shrimp species, one crab and pieces of shrimp were analyzed to determine the relative contributions of suction-feeding and ram-feeding behaviors to prey capture. The prey capture behaviors used by the predator were related to differences in escape behavior among the three shrimp species. H. decagrammus used behaviors characteristic of other ram-feeding predators when feeding on the two most elusive shrimp species: high attack velocity, attack initiated at a greater distance from the prey, and greater movement of the predator relative to the prey. Strikes at crabs and pieces of shrimp elicited strikes more typical of other suctionfeeding predators, with lower attack velocities, shorter initial predator–prey distances and greater relative movement of the prey towards the predator. Attacks on the least elusive shrimp species showed elements of both ram and suction feeding. Modulation of attack velocity increased capture success on elusive prey, supporting the hypothesis that diet diversity is associated with the presence of a repertoire of feeding behaviors. These data suggest that functional differences in prey anti-capture behavior, as well as the functional versatility of the predator, must be addressed in ecomorphological studies that try to correlate predator morphology with diet.
- General Note:
- Published IN: Journal of Experimental Biology, Vol. 200, no. 15 (1997). Available online at the Journal of Experimental Biology website.
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