Structure and diversity of phyllostomid bat assemblages on riparian corridors in a human-dominated tropical landscape.
Tropical forests around the world have been lost, mainly because of agricultural activities. Linear elements like riparian vegetation in fragmented tropical landscapes help maintain the native flora and fauna. Information about the role of riparian corridors as a reservoir of bat species, however, is scanty. We assessed the value of riparian corridors on the conservation of phyllostomid bat assemblage in an agricultural landscape of southern Mexico. For 2 years (2011-2013), mist-netting at ground level was carried out twice during the dry season (December to May) and twice during the wet season (June to November) in different habitats: (1) riparian corridors in mature forest, (2) riparian corridors in pasture, (3) continuous forest away from riparian vegetation, and (4) open pastures. Each habitat was replicated three times. To determine the influence of vegetation structure on bat assemblages, all trees (≥10 cm dbh) were sampled in all habitats. Overall, 1752 individuals belonging to 28 species of Phyllostomidae were captured with Sternodermatinae being the most rich and abundant subfamily. Riparian corridors in mature forest and pastures had the greatest species richness and shared 65% of all species. Open pastures had the lowest richness and abundance of bats with no Phyllostominae species recorded. Six of the 18 species recorded could be considered as habitat indicators. There was a positive relationship between bat species composition and tree basal area. Our findings suggest that contrary to our expectations, bats with generalist habits and naturally abundant could be useful detector taxa of habitat modification, rather than bats strongly associated with undisturbed forest. Also in human-dominated landscapes, the maintenance of habitat elements such as large trees in riparian corridors can serve as reservoirs for bat species, especially for those that are strongly associated with undisturbed forest.
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México Morelia, Michoacán, México.
Erika
E
de la Peña-Cuéllar
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México Morelia, Michoacán, México.
Julieta
J
Benítez-Malvido
Escuela Nacional de Estudios Superiores, Universidad Nacional Autónoma de México Morelia, Michoacán, México.
Luis Daniel
LD
Avila-Cabadilla
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México Morelia, Michoacán, México.
Miguel
M
Martínez-Ramos
Estacion de Biología Tropical "Los Tuxtlas", Instituto de Biología, Universidad Nacional Autónoma de México Morelia, Michoacán, México.
Alejandro
A
Estrada
Agricultural matrix; corridors; diversity; frugivores; indicator taxa