Ecologia de nidifícação de Podocnemis erythrocephala (Testudines, Podocnemidae) em campinas do Médio Rio Negro - AM
I studied some parameters of the reproductive ecology and factors that influence egg survivorship of Podocnemis erythrocephala (Spix, 1824) in four "campina" habitats at the mouth of Aiuanã River, Santa Isabel do Rio Negro municipality, Amazonas State, Brazil (S 00° 3r55.6", W 64° 55'11.5"). Betwee...
| Autor principal: | Batistella, Alexandre Milaré |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11430 http://lattes.cnpq.br/1367519149141424 |
| Resumo: |
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I studied some parameters of the reproductive ecology and factors that influence egg
survivorship of Podocnemis erythrocephala (Spix, 1824) in four "campina" habitats at the mouth of Aiuanã River, Santa Isabel do Rio Negro municipality, Amazonas State, Brazil (S 00° 3r55.6", W 64° 55'11.5"). Between October and December 2002, the four "campinas" were monitored on a daily basis during the egg laying season, and each turtle nest found was marked both with a numbered wooden stick and on a GPS receiver. Data on laying date, width of nest opening, depth to first egg, number of eggs, size of each egg, distance to vegetation cover, and distance to "campina"
border were recorded. The "campinas" were visited every three days, after the egg laying season, to detect evidence of nest predation. There were two egg laying periods, the first in early October and the other in the begining of December, separated by a period of "repiquetes" (flash floods). A total of 116 nests were recorded, with a nest density of 20 nests/ha, and mean of 9 eggs per nest. The
mean egg volume wasl4cm^. Females choose to nest in the most open sites, (with a plant cover of up to 50%). The nest loss reached 100% for the season. Seventy percent nest logt due to "repiquete". Twelve percent to predation by the mustelid Eira barbara (which prefered the newer nests closer to the water margin). And 9% to predation by the lizard Ameiva ameiva. The lizard preyed on nests less than 10 days old, that were up to lOm away írom the "campina" border. The nest following 9% to predation: 5% human, 2% Crocodilurus lacertinus (teiid), 1% Daptrius ater (falconid) and 1% not identify. |