Detail Diversity, extinction risk and structure in an insectivorous bat community from Malaysia Bibliografi Author: Kingston, Tigga ; Kunz, Thomas H. (Advisor) Topik: BIOLOGY; ECOLOGY|BIOLOGY; ZOOLOGY Bahasa: (EN )    ISBN: 0-599-71806-4     Penerbit: Boston University     Tahun Terbit: 2001     Jenis: Theses - Dissertation Fulltext: 9967154.pdf (0.0B; 0 download) Abstract Estimates of insectivorous bat diversity in the Palaeotropics have been hampered by the lack of long-term studies employing appropriate capture techniques. Using a variety of trapping methods, with the emphasis on an intensive harp-trapping protocol, I captured 42 species in 2 km2 over a 20 month period at Kuala Lompat Field Station (Krau Wildlife Reserve, Peninsular Malaysia). Total insectivorous diversity may exceed 50 species, making Kuala Lompat one of the most species-rich sites in the world. The correspondence between microhabitat use and ecomorphology (wing morphology and echolocation) supported a division of the community into open-space, edge/gap and narrow-space foraging guilds. Morphological variation between the 30 species of narrow-space insectivores reflected ecological differences; particular wing characteristics were associated with cave-roosting, hovering, and perch-hunting/flycatching. Differential flight performance in the Kerivoulinae and Murininae related directly to wing morphology and indicated that resource partitioning may be effected through differences in the degree of clutter that can be negotiated. Echolocation calls in these vespertilionids are typical of species that glean insects from surfaces: (broadband, frequency-modulated (FM) calls of low intensity and short duration), but distinguished by the use of very large bandwidths and extremely high frequencies. These features may enable the bat to discriminate insects from surfaces by spectral interference patterns, but impose limitations for social communication. Long duration, low frequency, multiharmonic calls integrated into Kerivoula pellucida sequences may be contact calls that resolve this problem. Multivariate analysis of wing morphology and echolocation in the narrow-space rhinolophoid bats indicates overdispersion of the most similar species and even spacing in phylogeny-free morphospace, suggesting that species in this guild experience limits to their similarity. The guild included a pair of cryptic species. The population of bats identified as Hipposideros bicolor comprised two genetically distinct (7% cytochrome-b sequence divergence) phonic types (peak frequencies of 131 kHz and 142 kHz). The risk of local extinction within the forest interior was estimated from data derived from the harp trapping program. The relative abundance of species provided an assessment of rarity, and the capture records were then geo-referenced within a GIS to derive the spatial distribution of species. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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