Bat diversity of Ilha da Marambaia, Southern Rio de Janeiro State, Brazil (Chiroptera, Mammalia)

Abstract

Few sites have been well sampled for bats, and samplings in islands are even scarcer. Therefore, the objectives of the present study were: (1) to list the bat species of Ilha da Marambaia; (2) to compare richness, abundance and biomass of bat guilds found there; (3) to analyse abundance patterns of bat species; and (4) to compare richness, abundance and composition of the bat fauna among different kinds of environment. To capture bats we used mist nets set in five different environments, totalising 3559.2 net-hours, during 37 nights between October 2006 and August 2008. A total of 1,133 captures were accomplished, comprising 34 species from five families. The most abundant species was Molossus molossus. Frugivorous bats exhibited higher richness, abundance and biomass if compared to other guilds. Most species (N = 22) exhibited abundances between 1 to 10% of all captures. Sixteen species were restricted to just one of the environments sampled. The high richness may be attributed to sampling carried out in several environments, and to the capture of insectivorous species over water bodies.Keywords: abundance, captures, sampling effort, survey methods. Diversidade de morcegos da Ilha da Marambaia, Sul do Rio de Janeiro, Brasil (Chiroptera, Mammalia) ResumoPoucos são os locais satisfatoriamente amostrados para morcegos e menos ainda as ilhas. Os objetivos deste estudo foram listar as espécies de morcegos da Ilha da Marambaia, comparar a riqueza, abundância e biomassa das guildas de morcegos encontradas, analisar o padrão de abundância das espécies de morcegos e comparar a riqueza, abundância e composição entre os diferentes ambientes amostrados. O método de amostragem consistiu do uso de redes de neblina armadas em cinco ambientes diferentes, totalizando 3559,2 redes-hora, em 37 noites entre outubro de 2006 e agosto de 2008. Foram obtidas 1.133 capturas, compreendendo 34 espécies de cinco famílias. A espécie mais abundante foi Molossus molossus. Os frugívoros apresentaram maior riqueza, abundância e biomassa. A maior parte das espécies (N = 22) apresentou abundâncias entre 1 e 10% do total de capturas. Dezesseis espécies foram restritas a apenas um dos ambientes amostrados. A elevada riqueza encontrada pode ser atribuída à realização de coletas em vários ambientes, e a captura de espécies insetívoras sobre a água.Palavras-chave: abundância, capturas, esforço amostral, métodos de amostragem.

Structure and natural history of an assemblage of bats from a xerophytic area in the Caatinga of northeastern Brazil

“…Yet, several studies indicate higher capture rates of insectivorous bats, especially molossids and vespertilionids, on water body margins (Myers and Wetzel 1983;Esbérard 2003;Silva 2007;Lourenço et al 2010;Costa et al 2012). Thus, we attribute our successful capture rates of M. lavali (and N. leporinus) to the placing of mist nets in in a V-shape, on the edge of water bodies where these bats forage.…”

Expansion of the southern limit of Vampyrodes caraccioli Thomas, 1889 (Chiroptera, Phyllostomidae) and first record for Santa Catarina state, southern Brazil

“…This species has been recorded for the Atlantic Forest biome in the northeast (Faria 2006), southeast (Lourenço et al 2010, Souza et al 2015 and recently in the south region of Brazil, in Paraná state, with this being the austral limit known for this species (Carvalho et al 2014). Studies about the fauna of bats for the state of Santa Catarina had not listed V. caraccioli (Cherem et al 2004, Passos et al 2010) and this study also represents the first record of this species in the state of Santa Catarina.…”

Bats (Mammalia, Chiroptera) from an area of Caatinga in southwestern Bahia, Brazil

“…In the present study, the insectivorous guild was abundant in the diurnal roosts, although no Molossus molossus were captured in the mist nets. The vespertilionid Myotis lavali was captured mainly in the nets set at the margins of small bodies of water, an ideal location for the capture of insectivorous bats (Lourenço et al 2010;Costa et al 2012;Novaes et al 2015).…”