Počet záznamů: 1  

Phenology of predation on insects in a tropical forest: temporal variation in attack rate on dummy caterpillars

  1. 1.
    0455017 - BC 2017 RIV US eng J - Článek v odborném periodiku
    Molleman, F. - Remmel, T. - Sam, Kateřina
    Phenology of predation on insects in a tropical forest: temporal variation in attack rate on dummy caterpillars.
    Biotropica. Roč. 48, č. 2 (2016), s. 229-236. ISSN 0006-3606. E-ISSN 1744-7429
    Grant CEP: GA ČR(CZ) GP14-32024P
    Institucionální podpora: RVO:60077344
    Klíčová slova: artificial prey * development time * functional response
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 1.730, rok: 2016
    http://onlinelibrary.wiley.com/doi/10.1111/btp.12268/abstract

    Temporal patterns of attack rates on insect n tropical forest habitats have not been studied systematically, because it is very difficult to observe and record elusive predation of omnipresent and tiny insect. Yet, in communities of tropical insects, adult abundance tends to fluctuate widely, perhaps owing exactly to predator–prey dynamics. However, the identity of predators of insects in tropical forests is poorly known, and their responses to temporal variation in prey abundance have rarely been explored. We recorded incidence and shape of marks of attacks on dummy caterpillars (proxy of predation rate) in a sub-montane tropical forest in Uganda during a year-long experiment, and explored correlations with inferred caterpillar abundance. Applying the highest and lowest observed daily attack rates on clay dummies over a realistic duration of the larval stage of butterflies, indicates that the temporal variation in attack rate could cause more than 10-fold temporal variation in caterpillar survival. Inferred predators were almost exclusively invertebrates, and beak marks of birds were very scarce. Attack rates by wasps varied more over time than those of ants that were present across all seasons. Attack rates on dummies peaked during the two wet seasons, and appeared congruent with inferred peaks in caterpillar density. This suggests (1) a functional response (predators shifting to more abundant resource) or adaptive timed phenology (predators timing activity or breeding to coincide with seasonal peaks in prey abundance) of predators, rather than a numerical response (predator populations increasing following peaks in prey abundance); and (2) that predation would dampen abundance fluctuations of tropical Lepidoptera communities.
    Trvalý link: http://hdl.handle.net/11104/0255762

     
     
Počet záznamů: 1  

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