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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

Estrutura da popula??o de Coleodactylus natalensis Freire, 1999 (Squamata: Sphaerodactylidae) no Parque Estadual Dunas de Natal, Rio Grande do Norte, Brasil

Lisboa, Carolina Maria Cardoso Aires 26 May 2008 (has links)
Made available in DSpace on 2014-12-17T14:10:18Z (GMT). No. of bitstreams: 1 CarolinaMCAL.pdf: 705892 bytes, checksum: 2a31e2f6fe2a3d439e931aaeb7c530eb (MD5) Previous issue date: 2008-05-26 / Coleodactylus natalensis Freire, 1999, an endemic species of Atlantic Forest fragments around the Natal municipality, Rio Grande do Norte State, Brazil, has as type locality the Parque Estadual Dunas de Natal (05?48 S to 05?53 S and 35?09 W to 35?12 W), one of the largest restinga (herb and shrub association on sand dunes along the Brazilian coastline) associate fragment, surrounded by urban zone, placed on setentrional Atlantic Forest limits. We made estimates on populational density, spatial distribution, habitat and microhabitat preferences and feeding ecological aspects like sazonal and sexual variations on diet, prey electivities and niche breadth. We randomly sampled ninety-six 50m2 quadrants in each of the four habitats identified in the study area. Were collected 49 specimens and their stomach contents were analyzed; prey items found were correlated with leaf-litter invertebrates from habitat samples. We found a 98,5 ? 75,5 individuals/ha density, in grouped distribution pattern on densest habitats and random distribution on others habitats. This species lives mostly on leaf-litter in forest habitats, in higher humidity points, with lower temperatures, deeper leaf litter and lower sea level elevations than the randomly chosen points in the study area. Isopoda and Aranae were the most important prey categories in numeric, frequency and volumetric terms. Niche breadth has an intermediate value and was variable in sexual and in habitat terms. There was no correlation between morfometric measures and prey size on diet. The C. natalensis population studied seems to be diet opportunist, although selects larger prey items. The Parque Estadual das Dunas do Natal has several indications of anthropic pressure from the surrounding urban area that may affects the local C. natalensis population. Thus, the fragility of this species calls for urgent conservation efforts / Coleodactylus natalensis Freire, 1999, esp?cie end?mica de remanescentes de Mata Atl?ntica do Estado do Rio Grande do Norte, Brasil, tem como localidade-tipo o Parque Estadual Dunas de Natal (05?48 S a 05?53 S e 35?09 W a 35?12 W), um dos maiores remanescentes associados a restingas, cercado por zona urbana, situado no limite setentrional da Mata Atl?ntica. Foram realizadas estimativas de densidade populacional, distribui??o espacial, prefer?ncias de h?bitat e microh?bitat e aspectos da ecologia alimentar, tais como varia??es sazonais e entre sexos de dieta, eletividade de presas e largura de nicho. Amostramos aleatoriamente 96 quadrantes de 50m2 em cada um dos quatro h?bitats identificados na ?rea. Foram coletados 49 exemplares, que tiveram seus conte?dos estomacais analisados; os itens de presa encontrados foram correlacionados com amostras de invertebrados ed?ficos obtidas no ambiente. Encontramos uma densidade m?dia de 98,5 ? 75,5 indiv?duos/ha, com distribui??o agrupada nos h?bitats de maior densidade e rand?mica nos demais. A esp?cie habita preferencialmente o folhi?o de h?bitats de mata, em pontos mais ?midos, temperaturas mais amenas, folhi?o mais denso e menores eleva??es em rela??o ao n?vel do mar do que a m?dia da ?rea de estudo. As categorias de presa mais importantes na dieta foram Isopoda e Aranae. A largura de nicho foi m?dia e variou sexualmente e entre os h?bitats. N?o houve correla??o entre medidas morfom?tricas e tamanho das presas consumidas. A popula??o de C. natalensis estudada parece ser oportunista em termos de dieta, embora selecione presas relativamente maiores. O Parque das Dunas ? uma ?rea que sofre diversos tipos de press?o antr?pica que podem afetar a popula??o de C. natalensis. Deste modo, a fragilidade desta esp?cie na ?rea denota urg?ncia por medidas conservacionistas

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