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Predation on exposed and leaf-rolling artificial caterpillars in tropical forests of Papua New Guinea

Published online by Cambridge University Press:  01 June 2012

Katerina Tvardikova  and
Vojtech Novotny
Katerina Tvardikova*
Affiliation:
Faculty of Science, University of South Bohemia and Biology Center, Czech Academy of Sciences, Branisovska 31/1160, 370 05 Ceske Budejovice, Czech Republic
Vojtech Novotny
Affiliation:
Faculty of Science, University of South Bohemia and Biology Center, Czech Academy of Sciences, Branisovska 31/1160, 370 05 Ceske Budejovice, Czech Republic
*
1Corresponding author. Email: [email protected]
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Abstract:

Although predation is generally seen as one of the key factors determining the abundance and composition of insect herbivore communities in tropical rain forests, quantitative estimates of predation pressure in rain-forest habitats remain rare. We compared incidence of attacks of different natural enemies on semi-concealed and exposed caterpillars (Lepidoptera) in lowland and montane tropical rain forests, using plasticine models of caterpillars. We recorded attacks on caterpillars in four habitats: primary forest, secondary forest and forest fragment in lowlands (200 m asl), and montane primary forest (1700 m asl). We used 300 exposed and 300 semi-concealed caterpillars daily, and conducted the experiment for 6 d in every habitat. Daily incidence of attacks was higher on exposed caterpillars (4.95%) than on semi-concealed (leaf-rolling) caterpillars (2.99%). Attack pressure of natural enemies differed also among habitats. In the lowlands, continuous primary and secondary forests had similar daily incidence of attacks (2.39% and 2.36%) which was however lower than that found in a primary forest fragment (4.62%). This difference was caused by higher incidence of attacks by birds, ants and wasps in the forest fragment. The most important predators were birds in montane rain forests (61.9% of identified attacks), but insect predators, mostly ants, in the lowlands (58.3% of identified attacks). These results suggest that rapid decrease in the abundance of ants with altitude may be compensated by increased importance of birds as predators in montane forests. Further, it suggests that small rain-forest fragments may suffer from disproportionately high pressure from natural enemies, with potentially serious consequences for survival of their herbivorous communities.

Keywords

antsbirdsLepidopteramodel caterpillarsparasitoidspredation pressureprimaryrain forestsecondary
Type
Research Article
Information
Journal of Tropical Ecology , Volume 28 , Issue 4 , July 2012 , pp. 331 - 341
Copyright
Copyright © Cambridge University Press 2012

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References

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