Resumo O estado do Rio Grande do Norte é considerado uma lacuna de informações sobre ocorrência de morcegos no Brasil. O estado também é atualmente alvo de grandes empreendimentos com potencial impacto sobre a quiropterofauna, especialmente no setor de energia eólica e mineração. Além disso, apresenta poucas unidades de conservação, e estas não possuem sua quiropterofauna estudada de maneira sistematizada. A Floresta Nacional de Nísia Floresta (FNNF), uma unidade de conservação federal de 174 hectares, localiza-se na costa leste do Rio Grande do Norte e corresponde a um dos últimos remanescentes de Mata Atlântica no estado e no limite norte do bioma. Foi realizado um inventário de morcegos na FNNF com a utilização de redes de neblina armadas no nível do solo, do por do sol ao amanhecer, de dezembro de 2011 a dezembro de 2012, totalizando 25 noites de amostragem. Nós capturamos 1379 morcegos pertencentes a quatro famílias e 16 espécies. Artibeus planirostris (Phyllostomidae) foi a espécie mais frequentemente capturada (n = 685; 50%), seguida por Myotis lavali (Vespertilionidae) (n = 248; 18%) e Phyllostomus discolor (Phyllostomidae) (n = 147; 11%). Peropteryx leucoptera, Phyllostomus discolor, Phyllostomus hastatus, Lophostoma brasiliense, Lasiurus blossevillii, Myotis lavali e Promops nasutus são novos registros para o Rio Grande do Norte, aumentando o número atual de espécies de morcegos no estado de 25 para 32. Inventários adicionais, especialmente utilizando amostragens acústicas com detectores de morcegos, tendem a acrescentar novas espécies à lista de morcegos da FNNF.

Abstract The state of Rio Grande do Norte is considered a data gap for bat species records in Brazil. The state is also currently target of large economic projects with potential impacts on bats, especially wind farms and mining enterprises. In addition, Rio Grande do Norte has few conservation units in which there is no systematic study on bat fauna. The Nísia Floresta National Forest (NFNF), a federally protected area of 174 hectares, is located in the eastern coast of Rio Grande do Norte and corresponds to one of the last remnants of Atlantic Forest in the state, in its northernmost limits. A bat inventory was conducted in NFNF using mist nets set at ground level, from sunset to sunrise, from December 2011 to December 2012, totaling 25 sampling nights. We captured 1,379 bats belonging to four families and 16 species. Artibeus planirostris (Phyllostomidae) was the most frequently captured species (n = 685; 50%), followed by Myotis lavali (Vespertilionidae) (n = 248; 18%) and Phyllostomus discolor (Phyllostomidae) (n = 147; 11%). Peropteryx leucoptera, Phyllostomus discolor, Phyllostomus hastatus, Lophostoma brasiliense, Lasiurus blossevillii, Myotis lavali, and Promops nasutus are new records for Rio Grande do Norte, increasing the current number of bat species from 25 to 32 in this state. Further inventories, especially using acoustic surveys with bat detectors, might add more species to the NFNF bat list.

In temperate zones, insectivorous bats use some types of habitat more frequently than others, and are more active in the warmest periods of the year. We assessed the spatial and seasonal activity patterns of bats in open areas of the southernmost region of Brazil. We tested the hypothesis that bat activity differs among habitat types, among seasons, and is influenced by weather variables. We monitored four 1,500-m transects monthly, from April 2009 to March 2010. Transects corresponded to the five habitat types that predominate in the region. In each sampling session, we detected and counted bat passes with an ultrasound detector (Pettersson D230) and measured climatic variables at the transects. We recorded 1,183 bat passes, and observed the highest activity at the edge of a eucalyptus stand (0.64 bat passes/min) and along an irrigation channel (0.54 bat passes/min). The second highest activity values (0.31 and 0.20 bat passes/min, respectively) were obtained at the edge of a riparian forest and at the margin of a wetland. The grasslands were used significantly less (0.05 bat passes/min). Bat activity was significantly lower in the winter (0.21 bat passes/min) and showed similar values in the autumn (0.33 bat passes/min), spring (0.26 bat passes/min), and summer (0.29 bat passes/min). Bat activity was correlated with temperature, but it was not correlated with wind speed and relative humidity of the air. Our data suggest that, in the study area, insectivorous bats are active throughout the year, and use mostly forest and watercourses areas. These habitat types should be considered prioritary for the conservation of bats in the southernmost region of Brazil.