Tuesday, May 27, 2008
348

Aquatic hymenoptera collected in aquatic ecosystems in central amazonia, brazil

Ranyse Querino1, Neusa Hamada2, Malu C. Feitosa2, and Claudiane Ramalheira2. (1) EMBRAPA-Roraima, BR 174 Km 8 - Distrito Industrial, Boa Vista, RR, Brazil, (2) Cpen, INPA, Caixa Postal 478, CEP 69011-970, Manaus, Brazil

In this study we report information on aquatic hymenopterous parasitoids from Brazil. Collections were made over the 2003-2006 period in Varzea (floodplain) and stream ecosystems in the Central Amazon region. The aquatic plants and marginal substratum were examined to verify the presence of eggs of aquatic insects. These eggs were collected and maintained in plastic containers with water to collect any parasitoids that emerged. After emergence, parasitoids were counted, preserved in 80% alcohol and identified to genus and, when possible, to species or morphospecies. The genera obtained were Aprostocetus (Eulophidae), Anagrus and Gonatocerus (Mymaridae), Hydrophylita and Pseudoligosita (Trichogrammatidae) and Telenomus (Scelionidae). The hosts of these Hymenoptera egg parasitoids belong to the orders Coleoptera, Hemiptera and Odonata. Only Mymaridae was also collected on Lepidoptera eggs. The aquatic plants Eichhornia crassipes, Thurnia sphaerocephala, Tonina fluviatilis and Urospatha sagittifolia were used as substrates by the hosts of the collected hymenoptera. In addition to the results on the associations between the parasitoids and the host and plants used as substrates, new species were discovered and reported.


Web Page: Aquatic insects, aquatic plants, Várzea

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