Revista Brasileira de Entomologia Revista Brasileira de Entomologia
Rev Bras Entomol 2018;62:29-35 - Vol. 62 Núm.1 DOI: 10.1016/j.rbe.2017.11.005
Biology, Ecology and Diversity
Assemblage of drosophilids (Diptera, Drosophilidae) inhabiting flooded and nonflooded areas in the extreme South of Brazil
L.B. Duartea, M.S. Gottschalkb, L.J. Robea,c,,
a Universidade Federal do Rio Grande (FURG), Programa de Pós-Graduação em Biologia de Ambientes Aquáticos Continentais (PPGBAC), Rio Grande, RS, Brazil
b Universidade Federal de Pelotas (UFPel), Instituto de Biologia, Departamento de Ecologia, Zoologia e Genética, Capão do Leão, RS, Brazil
c Universidade Federal de Santa Maria (UFSM), Programa de Pós Graduação em Biodiversidade Animal (PPGBA), Santa Maria, RS, Brazil
Recebido 06 Setembro 2017, Aceitaram 21 Novembro 2017

Several studies on the potential use of drosophilid assemblages as bioindicator systems have been carried out in the last years. Nevertheless, the successful application of these organisms in these systems requires adequate filling of several knowledge gaps. In this sense, little is known about drosophilid assemblages in wetlands and flooded areas. The present study provides the first survey of drosophilid species inhabiting such environments in the extreme South of Brazil and compares general beta-diversity patterns between assemblages of flooded versus nonflooded areas. The specimens were collected with banana-baited traps, and the assemblages recovered in eight wetlands of the southernmost coast of Brazil were compared to those recovered from seven nonflooded areas of the Pampa and Atlantic Forest biomes. A total of 5028 and 2571 individuals encompassing 27 and 37 species were collected in the flooded and nonflooded areas, respectively. The differential species composition patterns presented between these areas was statistically supported, which seems to be related to the lower beta-diversity presented by swamps, especially in regard to dominance patterns. So, the open and climatically harsher environment provided by wetlands possibly constitutes a hostile environment for the entry and, mainly, for the persistence of several native Drosophilidae species, in contrast to some exotic and more plastic species (as Drosophila simulans and Zaprionus indianus). Since the diversity gradient of flooded areas does not seem to be related to the conservation status of the swamp, our results question the use of Drosophilidae species as bioindicators of environmental disturbance and antropic influence in wetlands.

Beta-diversity, Bioindicator species, Gamma-diversity, Swamps, Wetlands
Rev Bras Entomol 2018;62:29-35 - Vol. 62 Núm.1 DOI: 10.1016/j.rbe.2017.11.005