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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Propriedades ac?sticas das chamadas de distress emitidas por morcegos stenodermat?neos (Chiroptera: Phyllostomidae) durante manipula??o em campo / Acoustical Properties of the distress calls of Stenodermatineo bats (Chiroptera: Phyllostomidae) during handling in field

MAAS, Andrea Cec?lia Sicotti 16 December 2010 (has links)
Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-02-07T20:27:42Z No. of bitstreams: 1 2010 - Andrea Cec?lia Sicotti Maas.pdf: 2297895 bytes, checksum: 356a05153807fe7b25a4fd3042b79964 (MD5) / Made available in DSpace on 2017-02-07T20:27:42Z (GMT). No. of bitstreams: 1 2010 - Andrea Cec?lia Sicotti Maas.pdf: 2297895 bytes, checksum: 356a05153807fe7b25a4fd3042b79964 (MD5) Previous issue date: 2010-12-16 / CNPq / Studies envolving bioacustic have strongly collaborated for understanding phylogenetics, ontogenetics, environmental and behavioural processes. Vocal communication is important for the bats for navigation and food attainment, nevertheless represents a key aspect for social interactions. Several studies have demonstrated characteristics of echolocation vocalizations and other types of audio signals. However, few studies have been described with respect to of distress calls. Among these studies have described the vocalizations of distress calls as being of animals in situations of extreme danger, such as when the animal is caught by a predator or even when it is contained by a researcher. Some authors have offered hypotheses to explain a general convergence in the structure of vocalizations produced by birds and mammals in similar behavioral contexts. However, there are few studies have been done on the distress calls in bats. The present general study's objective is to produce and analyze a database for bioacoustics in the context distress vocalizations emitted by bats, analyze and describe the acoustic properties of distress vocalizations in bats of the subfamily Stenodermatinae. Data collection investigations have been carried out in five different locations within the southeast region of Brazil. For this study, were recorded vocalizations of bats in subfamily Stenodermatinae: Artibeus cinereus, Artibeus fimbriatus, A. planirostris, A. obscurus, A. lituratus, Platyrrhinus lineatus, P. recifinus and Vampyressa pusilla. The vocalizations were analyzed using the analysis system Raven v1.3. For analysis, we selected 30 calls of each individual. The following parameters were measured: Types of signs, bands tonal, duration of the signal, and interval of Pre-pulse, interval of post-pulse, minimum frequency, maximum frequency, initial frequency, maximum frequency and peak frequency. For a description of the acoustic parameters were averaged, standard deviation and coefficient of variation values of each of the measured parameters of vocalizations for each species. Through the analysis, we identify two basic types of notes for this noise present in the calls of distress among the species. The results presented here showed that the acoustic parameters corroborate other work in this same context, ie: distress vocalizations of the bat species studied may be the motivation of aggression, as the code calling the motivational structure, characterized in general for they present low frequency, in wide bands and loaded of noises. / As pesquisas com bioac?stica t?m colaborado na compreens?o de processos filogen?ticos, ontogen?ticos, ecol?gicos e comportamentais. Para os morcegos, a comunica??o vocal ? importante para navega??o e obten??o de alimentos, al?m de ser um aspecto chave nas intera??es sociais. V?rios estudos t?m demonstrado caracter?sticas de vocaliza??es de ecolocaliza??o e outros tipos de sinais aud?veis. Por?m, poucos estudos t?m sido descritos com rela??o ?s chamadas de distress. Dentre esses estudos t?m-se descrito as vocaliza??es de distress como sendo chamadas de animais em situa??es de extremo perigo, tais como quando esse animal ? capturado por um predador ou mesmo quando ? contido por um pesquisador. Alguns autores t?m apresentado hip?teses para explicar uma converg?ncia geral na estrutura das vocaliza??es produzidas por p?ssaros e mam?feros em contextos comportamentais similares. H?, entretanto, poucos estudos sendo desenvolvidos sobre as chamadas de distress em morcegos. O presente estudo tem como objetivo geral ? elabora??o e an?lise de um banco de dados bioac?sticos para vocaliza??es no contexto distress, emitidas por morcegos filostom?deos, analisar e descrever as propriedades ac?sticas das vocaliza??es de distress em morcegos da subfam?lia Stenodermatinae. As coletas dos dados bioac?sticos foram realizadas em cinco locais diferentes dentro da regi?o sudeste do Brasil. Para o presente estudo, foram gravadas vocaliza??es de morcegos da Subfam?lia Stenodermatinae: Artibeus cinereus, Artibeus fimbriatus, A. planirostris, A. obscurus, A. lituratus, Platyrrhinus lineatus, P. recifinus e Vampyressa pusilla. As vocaliza??es foram analisadas utilizando o sistema de an?lise Raven v1.3. Para an?lise, foram selecionadas 30 chamadas de cada indiv?duo. Os seguintes par?metros foram mensurados: Tipos de Sinais, bandas tonais, dura??o do sinal, Intervalo do Pr?-pulso, Intervalo do P?s-pulso, freq??ncia m?nima, freq??ncia m?xima, freq??ncia inicial, freq??ncia m?xima e freq??ncia pico. Para a descri??o dos par?metros ac?sticos foram calculados a m?dia, o desvio padr?o e o coeficiente de varia??o dos valores obtidos de cada um dos par?metros medidos das vocaliza??es para cada esp?cie. Atrav?s das an?lises, pudemos identificar dois tipos b?sicos de notas para esta emiss?o sonora presente nas chamadas de distress dentre as esp?cies estudadas. Os resultados aqui apresentados mostraram que os par?metros ac?sticos corroboram com outros trabalhos neste mesmo contexto, ou seja: as vocaliza??es de distress das esp?cies de morcegos estudadas podem representar a motiva??o de agressividade, conforme o c?digo de estrutura motivacional da vocaliza??o, caracterizadas em geral por apresentarem baixa frequ?ncia, em bandas larga e carregada de ru?dos.

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