Diversidade de membracídeos (Hemiptera, Membracidae) e sobreposi??o de recursos tróficos em área do semi-árido

摘要

We examined 1,069 individuals of 13 species of membracids collected on their host plants, between August 2004 and September 2005, in a semi-arid region, State of Paraíba, Northeastern Brazil. Enchenopa concolor (Fairmaire, 1846) (31.6%) and E. euniceae Cre?o-Duarte & Rothéa, 2006 (24.8%) were the most abundant species. Five families of host plants harbored these insects. Amongst these families, Fabaceae showed the highest richness (12) and abundance (70.3%) of membracids. Darnis olivacea Fabricius, 1803, Hygris beckeri Sakakibara, 1998 and Sundarion flavum (Fairmaire, 1846) showed the highest values of niche breadth. Amongst the most abundant species, E. minuta Cre?o-Duarte & Rothéa, 2006 and Micrutalis binaria (Faimaire, 1846) showed the highest trophic niche overlap, but the temporal overlap between them was relatively low. The results revealed possible strategies developed by the species for coexistence and utilization of resources in Caatinga.