Full text
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| Author(s): |
Danilo Boscolo
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. , gráficos, ilustrações, tabelas. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2002-07-01 |
| Examining board members: |
Jean Paul Walter Metzger;
Mauro Galetti Rodrigues;
Jacques Marie Edme Vielliard
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| Advisor: | Jean Paul Walter Metzger |
| Field of knowledge: | Biological Sciences - Ecology |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP |
| Location: | Universidade de São Paulo. Biblioteca do Instituto de Biociências; IB/M-1066 |
| Abstract | |
In order to provide rapid access to presence/absence data of six species of birds (Basileuterus leucoblepharus, Batara cinerea, Carpornis cucullatus, Chiroxiphia caudata, Pyriglena leucoptera and Trogon surrucura) inside forest fragments, an efficient playback method was developed. The broadcast of these birds vocalizations was carried out at the Morro Grande Forrest Reserve (Cotia, SP). Playback tests were executed three times a day (sunrise, noon and before sunset) during one year. Daily and seasonal variations in the efficiency of the play-back were tested with G-statistics and the Rayleigh test. Sunrise and noon were more efficient than the period before sunrise to B. leucoblepharus, C. caudata and T. surrucura. The only species to show an annual period of higher rate of response was B. cinerea. To evaluate the real efficiency of the method, 13 forest fragments were surveyed for presence of these birds. The data was compared to the abundance of the birds in these areas. Each fragment was surveyed four times. At least two surveys are needed for C. caudata. Three surveys are the minimum effort to access the distributional pattern of B. leucoblepharus, B. cinerea, P. leucoptera and T. surrucura. Due to its rarity, C. cucullatus must be censused not less than four times. The method developed in the current study was created to provide a rapid access to the patch occupancy patterns of these six species in a large number of fragments. That kind of data may be very useful in studies about metapopulation dynamics and conservation ecology. (AU) | |
| FAPESP's process: | 00/01358-6 - The use of play-back techniques in the development of a method capable of confirming the presence or absence of birds in the interior of forest fragments |
| Grantee: | Danilo Boscolo |
| Support Opportunities: | Scholarships in Brazil - Master |