Case selection by a limnephilid caddisfly [Potamophylax latipennis (Curtis)] in response to different predators |
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Authors: | Luz Boyero Pedro A Rincón Jaime Bosch |
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Institution: | (1) Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain;(2) School of Tropical Biology, James Cook University, Townsville, Queensland, 4810, Australia |
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Abstract: | Some organisms use morphological structures obtained by behavioural processes to lower mortality by predation. We test whether
larvae of the limnephilid caddisfly Potamophylax latipennis (Curtis) vary their responses to the presence of different predators (dragonfly naiads, fire salamander larvae or brown trout)
by choosing organic or mineral cases. We offered both case types to larvae, and simulated differences in predation risk using
water conditioned with chemicals from the different predators. Our results show that Potamophylax larvae detect and discriminate predators using water-borne chemical cues and alter their choice of case type according to
the perceived predation risk. Moreover, the distribution of larvae bearing cases of different anti-predator value matches
the spatial variation in predation risk in the field. |
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Keywords: | Behaviour Predation risk Inducible defences Trichoptera |
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