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Rainfall and parasitic wasp (Hymenoptera: Ichneumonoidea) activity in successional forest stages at Barro Colorado Nature Monument, Panama, and La Selva Biological Station, Costa Rica

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1 In 1997, we ran two Malaise insect traps in each of four stands of wet forest in Costa Rica (two old-growth and two 20-year-old stands) and four stands of moist forest in Panama (old-growth, 20, 40 and 120-year-old stands).

2 Wet forest traps caught 2.32 times as many ichneumonoids as moist forest traps. The average catch per old-growth trap was 1.89 times greater than the average catch per second-growth trap.

3 Parasitoids of lepidopteran larvae were caught in higher proportions in the wet forest, while pupal parasitoids were relatively more active in the moist forest.

4 We hypothesize that moisture availability is of key importance in determining parasitoid activity, community composition and trophic interactions.

Keywords: Barro Colorado Nature Monument; Ichneumonoidea; La Selva; parasitoids; precipitation; tropical moist forest; tropical wet forest

Document Type: Research Article


Affiliations: Institute of Ecology, University of Georgia, Athens, GA 30602-2602, U.S.A.

Publication date: February 1, 2000


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