Livros e Publicações
URI permanente para esta coleçãohttps://bdc.icmbio.gov.br/handle/cecav/1481
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Resultados da Pesquisa
Item Priority areas and integrated actions for the conservation of Amazonian turtle populations historically over-exploited by humans.(Ethnobiology and Conservation, 2022-08-29) Gamba, Fábio Brega; Falcon, Guth Berger; Simoncini, Melina Soledad; Balestra, Rafael Antônio Machado; Malvasio, AdrianaThe definition of priority areas for conservation and integrated management actions are essential for the effective maintenance and recovery of natural populations, especially for species overexploited by humans. Amazonian chelonians are a food resource historically used by people, resulting in the decline of species populations and worsening the risk of local extinctions. In this paper, we establish priority areas and define integrated conservation actions for populations of three Amazonian chelonians most threatened by human consumption in Brazil (Podocnemis expansa, P. unifilis and P. sextuberculata). To do so, we used 15 prioritization criteria (ecological, logistical and socioeconomic) estimated with 30 years monitoring data in 15 areas by the Amazon Chelonian Program (in portugues Projeto Quelonios da Amazonia, PQA). Each criterion presented four levels of priority with scores increasing according to the relevance for conservation of chelonian populations. The sum of the scores obtained in each area of the PQA allowed a ranking and four categories of importance for conservation to be defined. We also analyzed the similarity of scores among areas of the PQA and among the prioritization criteria to evaluate the application of integrated conservation action strategies. The areas of PQA were classified as Extremely Important for Conservation (Rebio Trombetas River, Middle Xingu River, Middle Araguaia River, Upper Guaporé River), Very Highly Important for Conservation (Middle Purus River, Middle Juruá River, Crixás-Açu River Mouth, Sub-middle Tapajós River); Highly Important for Conservation (Sub-Middle Araguaia River, Amazonas River Mouth, Middle Mortes River); and Important for Conservation (Middle Guaporé River, Lower Branco River, Flechal River, Afuá River). The prioritization and similarity analyses can support the development of a national integrated plan of conservation actions to reduce the overexploitation of Amazon chelonian populations, according to the ecological, logistical and socioeconomic needs of each PQA area.Item Hydrological Effects on the Reproduction of the Giant South American River Turtle Podocnemis expansa (Testudines: Podocnemididae)(Ichthyology & Herpetology, 2022) Simoncini, Melina S.; de Sousa, Heitor Campos; Portelinha, Thiago Costa Gonçalves; Falcon, Guth Berger; Collicchio, Erich; Balestra, Rafael A. Machado; Luz, Vera L. Ferreira; Colli, Guarino Rinaldi; Malvasio, AdrianaUnderstanding the relationship between species and the environment is crucial to predicting their responses to human-induced global changes, i.e., habitat conversion, biological invasions, and global warming. Precipitation and river level are relevant factors that regulate the populations of aquatic organisms. We used long-term data to assess the effects of climate on nest number, clutch size (number of eggs per nest), hatching success, and unviable eggs of the Giant South American River Turtle (Podocnemis expansa) in a protected area of Brazilian Amazonia. We found a positive relationship between the number of nests and precipitation on headwaters in May. We also observed that clutch size increased when the local river level rose; hatching success increased with rising local river level, mainly during October and November; and egg failure increased with rising headwater river level. We show how precipitation and river level (at local and headwater) can influence reproductive success in P. expansa, highlighting the perils of human-induced environmental changes.- Avaliação da influência dos fatores ambientais sazonais na reprodução da tartaruga-da-amazônia (Podocnemis expansa)(Ibama, 2019) Simoncini, Melina S.; Portelinha, Thiago Costa Gonçalves; Montelo, Kennedy Mota; Falcon, Guth Berger; Collicchio, Erich; Balestra, Rafael Antônio Machado; Luz, Vera Luz Ferreira; Malvasio, Adriana; Lacava, Roberto Victor; Balestra, Rafael Antônio Machadocapítulo avalia a influência dos fatores ambientais sazonais na reprodução da tartaruga-da-amazônia (Podocnemis expansa) em um estudo de caso no Tocantins. A pesquisa destaca a relação estreita entre as atividades reprodutivas dos répteis e o clima, enfatizando a importância de entender essas interações para a conservação da espécie. O estudo também aborda os impactos das mudanças ambientais causadas pelo homem, como a construção de barragens e o desmatamento, na vida e reprodução da tartaruga.