Bibliography Record
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Wirsing, Aaron J.; Heithaus, Michael R.; Dill, Lawrence M.
(detail)
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2011 |
Predator-induced modifications to diving behavior vary with foraging mode.
Oikos 120(7): 1005-1012. 4 tables. 1 fig. DOI: 10.1111/j.1600-0706.2010.18844.x. July 2011.
–ABSTRACT: Breath-hold divers are strongly interacting species whose top–down influence on aquatic communities is shaped by factors governing their diving decisions. Although some of these factors (e.g. physiological constraints, energetic needs) have been scrutinized, the possibility that predation risk influences diving behavior has been largely overlooked, and no study to date has asked if anti-predator responses by divers depend on foraging mode. We contrasted dive cycle changes by herbivorous dugongs Dugong dugon using two foraging tactics – cropping, which always permits anti-predator vigilance, and excavation, which limits surveillance at depth – in response to temporal variation in tiger shark Galeocerdo cuvier abundance. Dugongs responded to increasing shark abundance (one component of predation risk) by diving more frequently without changing their surface times and thereby spending a greater proportion of time at the surface, but only while excavating. When threatened, in other words, excavating dugongs sacrificed foraging time at depth to facilitate shark detection. In contrast, cropping dugongs at risk from sharks were able to continue diving and foraging normally. By implication, future studies should consider the influence of predation risk on diving decisions, even by large-bodied species, and the possibility that behavioral responses by divers to predators may vary with foraging mode.
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Related Index Records (5)
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Behavior, Ingestive
(SEE ALSO: Behavior, Epimeletic; Behavior, Et-epimeletic; Food; Mastication; Milk)
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2011 |
Wirsing et al. (DD; feeding and diving mode in presence of tiger sharks) |
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Behavior, Shelter-seeking or Escape
(SEE ALSO: Hunting and Capture; Migration and Movements; Natural Death or Injury; Temperature, Effects of)
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2011 |
Wirsing et al. (DD; feeding and diving mode in presence of tiger sharks) |
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Dugong dugon (Müller, 1776) Palmer, 1895
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2011 |
Wirsing et al. (feeding and diving mode in presence of tiger sharks) |
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Natural Enemies
(SEE ALSO: Natural Death or Injury)
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2011 |
Wirsing et al. (DD; feeding and diving mode in presence of tiger sharks) |
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Respiration and Diving
(SEE ALSO: Locomotion)
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2011 |
Wirsing et al. (DD; feeding and diving mode in presence of tiger sharks) |
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