Journal of Tropical Ecology



Comparing composition and diversity of parasitoid wasps and plants in an Amazonian rain-forest mosaic


Ilari E. Sääksjärvi a1c1, Kalle Ruokolainen a1, Hanna Tuomisto a1, Samuli Haataja a1, Paul V. A. Fine a2, Glenda Cárdenas a3, Italo Mesones a3 and Víctor Vargas a3
a1 Department of Biology, University of Turku, FIN-20014 Turku, Finland
a2 Department of Biology, University of Utah, Salt Lake City, USA
a3 Universidad Nacional de la Amazonía Peruana, Facultad de Biologia, Iquitos, Peru

Article author query
saaksjarvi ie   [PubMed][Google Scholar] 
ruokolainen k   [PubMed][Google Scholar] 
tuomisto h   [PubMed][Google Scholar] 
haataja s   [PubMed][Google Scholar] 
fine pv   [PubMed][Google Scholar] 
cardenas g   [PubMed][Google Scholar] 
mesones i   [PubMed][Google Scholar] 
vargas v   [PubMed][Google Scholar] 

Abstract

Local species richness and between-site similarity in species composition of parasitoid wasps (Hymenoptera: Ichneumonidae; Pimplinae and Rhyssinae) were correlated with those of four plant groups (pteridophytes, Melastomataceae, Burseraceae and Arecaceae) in a western Amazonian lowland rain forest mosaic. The mosaic structure of the forest was related to variation in soils within the non-inundated terrain. Significant matrix correlation between patterns in parasitoid wasp species composition and plant species composition was found. Most of the overall correlation was due to idiobiont parasitoids of weakly concealed hosts, which attack host larvae and pupae in exposed situations, with two of the four ecologically defined parasitoid groups showing no correlation at all. A positive correlation between the number of plant species and the number of Pimplinae and Rhyssinae species at a site was found when the latter was corrected for collecting effort. Consequently, the degree of floristic difference between sites may be indicative of the difference in species composition of ichneumonids, and the species richness of plants may serve as a predictor of the species richness of parasitoid wasps. Although these results were obtained in a mosaic including structurally and floristically clearly different types of rain forest, the correlation coefficients were relatively low, and the present results lend only weak support to the idea of using plant distributions as indicators of animal distributions.

(Accepted August 30 2005)


Key Words: environmental heterogeneity; faunistic composition; floristic composition; Ichneumonidae; lowland rain forest; parasitoid wasps; species richness.

Correspondence:
c1 Corresponding author. Email: ilari.saaksjarvi@utu.fi