OCCURRENCE AND CHARACTERIZATION OF INSECT GALLS IN THE FLORESTA NACIONAL DE SILVÂNIA, BRAZIL

ABSTRACT

In the present paper we investigated the insect gall distribution along savanna and forest sites in the Floresta Nacional de Silvânia, Goiás, Brazil. The insect gall fauna was surveyed bi-monthly between December 2009 and June 2010. In total we found 186 insect gall morphotypes, distributed on 35 botanical families and 61 plant species. Ninety-nine insect gall morphotypes were recorded in the forest and 87 in the savanna. Gall-inducing insects belonged to Coleoptera, Diptera, Hemiptera, Lepidoptera and Thysanoptera, with highlight to Cecidomyiidae (Diptera) that induced 34.1% of the gall morphotypes. Parasitoids and/or inquilines were recorded in 38 morphotypes, mainly from the families Eulophidae, Eurytomidae and Torymidae (Hymenoptera). Fabaceae was the botanical family with the greatest richness of galls, followed by Asteraceae and Sapindaceae, being Protium (Burseraceae), Siparuna (Siparunaceae) and Serjania (Sapindaceae) the main host genera. This is the first systematic survey of insect galls realized in the Flona-Silvânia, which result in six plant species are recorded for the first time in Brazil as host of insect galls.

KEY-WORDS:
Cecidomyiidae; Cerrado; Fabaceae; Plant-insect interaction