@article {58054, title = {Contribution of acoustic methods to the study of insectivorous bat diversity in protected areas from northern Venezuela }, journal = {Acta ChiropterologicaActa Chiropterologica}, volume = {2}, number = {2}, year = {2000}, pages = {171-183}, abstract = {We present the results of an acoustic survey of aerial insectivorous bats conducted in four protected areas in
northern Venezuela. These areas represent localities where the taxonomic composition of the bat communities
was relatively well known. We conducted field surveys using the Anabat II detector and analysis system. We
compared acoustic inventories with previous lists obtained with conventional sampling methods (principally
mist nets). We identified 30 species acoustically (representing 15 genera of the families Emballonuridae,
Noctilionidae, Mormoopidae, Vespertilionidae, and Molossidae) on the basis of vocal signatures. Nineteen of
these were verified by capture and subsequent recording of released animals; the remainder were identified by
comparison with verified vocalizations from other localities. An additional 11 unidentified but distinct taxa
were recorded and are referred to here as {\textquoteright}sonotypes{\textquoteright} (based on similarities in call structure to known species)
representing eight genera of the families Emballonuridae, Vespertilionidae, and Molossidae. The short-term
acoustic surveys nearly equaled or exceeded the known species richness at three ofthe four localities, and added
two to nine species to previous lists from all locations; many of these bats correspond to taxa difficult to detect
with conventional capture methods.}, keywords = {acoustic survey, Anabat, community inventory, insectivorous bats, Neotropics, protected areas, sonotypes, technique comparison, Venezuela}, author = {Ochoa, Jos{\'e} and O{\textquoteright}Farrell, Michael J. and Miller, Bruce W.} } @article {58052, title = {Use of vocal signatures for the inventory of free-flying Neotropical bats}, journal = {BiotropicaBiotropica}, volume = {31}, number = {3}, year = {1999}, pages = {507-516}, abstract = {

An ongoing study is being conducted to test the efficacy of the Anabat II detector and analysis system in obtaining reliable vocal signatures for the identification of non-phyllostomid species of bats. We sampled a wide range of elevations and associated habitat types throughout Belize. Anabat provides an instantaneous output of echolocation call structure with a laptop computer. Select sequences can be saved directly to the hard drive, avoiding extraneous noise and sound distortion commonly associated with tape recorders. To date, 18 of the 37 species known or expected
to occur in the study region were identified by recognizable differences in the time-frequency characteristics of echolocation calls. In general, each family is recognizable by call structure patterns and species readily separated by frequency range parameters. Species that commute or forage at high altitudes are not susceptible to capture but are conspicuous by acoustic sampling. Further work is needed to determine limitations of the equipment, establish better sampling procedures, and develop a comprehensive library of vocal signatures incorporating the range of variation
inherent in each species. As this work progresses, we predict the addition of hitherto unknown species occurring within the study region.

}, keywords = {acoustic identification, Anabat, bats, Bauerus dubiaquercus, Chiroptera, diversity assessment, Emballonuridae, Eptesicus furinalis, inventory, Mormoopidae, Mormoops megalophylla, Myotis elegans, Neotropics, Noctilio leporinus, Pteronotus davyi, Pteronotus parnellii, Pteronotus personatus, Rhogeessa tumida, Saccopteryx bilineata, Saccopteryx leptura}, author = {O{\textquoteright}Farrell, Michael J. and Miller, Bruce W.} }