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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
23/02/1999 |
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Data da última atualização: |
23/02/1999 |
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Autoria: |
LUTZ, P. L.; DUNBAR-COOPER, A. |
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Título: |
The nest environment of the American crocodile (Crocodylus acutus). |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Copeia, n.1, p.153-161, 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
In the southern tip of the Everglades, Florida, a small population of the American crocodile, Crocodylus acutus builds nests in two quite different substrates, sand/shell and marl. Changes in temperature, soil water and gaseous composition were monitored in selected nets throughout incubation, and the gaseous resistance of the soil measured. Temperatures increased from approximately 30 C to a maximum of 34 C over incubation and no differences were found between the two nest types. The marl nests had a higher water content than the sand/shell nests and had a significantly higher resistance to gaseous difussion. In both nest types there was a decline in PO2 and an increase in PCO2 over incubation, with greater extreme reached in the marl nests. In sand/shell nests, eggs lost 15% of initial wet weight over incubation. It is suggested that the crocodile embryo adapts to the characteristics of the different substrates by matching its metabolic rate to the gaseous environment of the nest. Important similarities in bird and crocodilian egg development suggests that the birds have been highly conservative in this feature of their biology. |
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Palavras-Chave: |
American crocodile; Nest environment; Reptile. |
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Thesagro: |
Crocodilo; Meio Ambiente; Ninho; Réptil. |
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Thesaurus Nal: |
Crocodylus acutus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01728naa a2200229 a 4500
001 1793616
005 1999-02-23
008 1984 bl --- 0-- u #d
100 1 $aLUTZ, P. L.
245 $aThe nest environment of the American crocodile (Crocodylus acutus).
260 $c1984
520 $aIn the southern tip of the Everglades, Florida, a small population of the American crocodile, Crocodylus acutus builds nests in two quite different substrates, sand/shell and marl. Changes in temperature, soil water and gaseous composition were monitored in selected nets throughout incubation, and the gaseous resistance of the soil measured. Temperatures increased from approximately 30 C to a maximum of 34 C over incubation and no differences were found between the two nest types. The marl nests had a higher water content than the sand/shell nests and had a significantly higher resistance to gaseous difussion. In both nest types there was a decline in PO2 and an increase in PCO2 over incubation, with greater extreme reached in the marl nests. In sand/shell nests, eggs lost 15% of initial wet weight over incubation. It is suggested that the crocodile embryo adapts to the characteristics of the different substrates by matching its metabolic rate to the gaseous environment of the nest. Important similarities in bird and crocodilian egg development suggests that the birds have been highly conservative in this feature of their biology.
650 $aCrocodylus acutus
650 $aCrocodilo
650 $aMeio Ambiente
650 $aNinho
650 $aRéptil
653 $aAmerican crocodile
653 $aNest environment
653 $aReptile
700 1 $aDUNBAR-COOPER, A.
773 $tCopeia$gn.1, p.153-161, 1984.
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Embrapa Pantanal (CPAP) |
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