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Habitats, population densities, and social structure of capybaras (Hydrochaeris Hydrochaeris, Rodentia) in the Pantanal, Brazil Zoologia
Alho,Cleber J.R.; Rondon,Nelson L..
(1) The Pantanal is the central portion of a sunken flat plain bordering the upper Paraguay river, with an area of 140,000 km². Seasonal floods begin in January and end in April. From May to October the land dries out and campos (grassland formations) and scattered pools appear. (2) Typical capybara habitat in the Pantanal is composed of three components: the water, a patch of forest, and a grass field for foraging. Highest densities of capybaras (14 individuals/km²) were found during the rainy season when the available space for capybaras was reduced due to the flooding. Areas without ponds or creeks presented low densities (from 0.38 to 0.84 capybaras/km²). Group sizes ranged from 2 to 49 individuals (x = 9.48). (3) Reproduction occurred year-round and...
Tipo: Info:eu-repo/semantics/article
Ano: 1987 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751987000200006
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Contaminação por mercúrio em sedimento e em moluscos do Pantanal, Mato Grosso, Brasil Zoologia
Vieira,Luiz M.; Alho,Cleber J.R.; Ferreira,Geraldo A.L..
The total level of mercury detected in the sediment and in the tissues of molluscs from the Bento Gomes basin, although low, have shown that the mercury used in the gold mining activities in the Poconé wetlands has contaminated those aquatic habitats in Pantanal. From 69 sediment samples analyzed, 26 % (N = 18) have shown levels ranging from 0.01 to 0.25µg.g-1 of mercury (moist weight). Mercury levels analyzed in 54 samples of mollusc tissues (Ampullaria scalaris Orbigny, 1835; A. canaliculata Lamarck, 1819 and Marisa planogyra Pilsbry, 1933) have shown that 30% (N = 16) were contaminated with levels ranging from 0.02 to 1.16µg.g-1 moist weight. This study shows that the mercury used in digs for gold mining and released into the environment has reached the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Molluscs; Biomagnification; Contaminants; Mercury; Sediment.
Ano: 1995 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300022
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Mamíferos da Fazenda Nhumirim, sub-região de Nhecolândia, Pantanal do Mato Grosso do Sul: I - levantamento preliminar de espécies Zoologia
Alho,Cleber J.R.; Lacher, Jr.,Thomas E.; Campos,Zilca M.S.; Gonçalves,Humberto C..
The pantanal is one of the world's richest freshwater wetlands. The pantanal is located in the flood plain of the headwaters of the Paraguai river, covering 140,000km². The habitats of the Pantanal are present in a complex mosaic. The major habitat types are: pockets of forests, called capão or cordilheira, seasonally flooded grasslands or campos, and permanent or temporary lagoons, called baías. The Pantanal harbors both rich and abundant mammal fauna. A survey was conducted at Fazenda Nhumirim, a research station run by the Centro de Pesquisa Agropecuária do Pantanal (CPAP) in Corumbá, a research branch of EMBRAPA. The Fazenda covers an area of 4,310 ha in the sub-region of Nhecolândia, appoximately 150km east of Corumbá, Mato Grosso do Sul. The area...
Tipo: Info:eu-repo/semantics/article
Ano: 1987 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751987000200007
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