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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
27/03/1996 |
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Data da última atualização: |
07/04/2017 |
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Autoria: |
CAMPOS, Z. M. da S. |
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Afiliação: |
EMBRAPA. Centro de Pesquisa Agropecuaria do Pantanal (Corumba, MS). |
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Título: |
Effect of habitat on survival of eggs and sex ratio of hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Journal of Herpetology, v.27, n.2, p.127-132, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
Flooding of nests and predation were identified as the major mortality agents of eggs of Caiman crocodilus yacare in Brazil. Nests on floating grass mats and in forest were flooded in 1989, but only floating grass mats nests were flooded in 1990. Predation on eggs was high in forest nests, but my presence may have increased predation. No nest on floating grass mats was attacked by predators. The period of sex determination of C.c.yacare can extend to 40 days of incubation. I predicted nest temperature with a multiple regression model incorporating weather variables during incubation. The predicted nest temperatures for nests on floating grass mats and nests in forest were correlated with the sex ratio of the clutch. High nest temperatures ( > 315 C) produced mostly males, and low nest temperatures ( < 305 C) produced only females. The estimated sex ratio varied between years in nests on floating grass mats, but not in forest nests. Estimated nest temperatures significantly affected the snout-vent lengths of hatchlings but not their masses. Fifty percent of nesting occurred on floating grass mats, so the destruction of this habitat by introduced animals such as the water buffalo (Bubalus babalis) will adversely affect the productivity and hence long-term density of caimans in the Pantanal. |
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Palavras-Chave: |
Preservacao; Preservation; Survival; Yacare. |
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Thesagro: |
Ecologia; Habitat; Jacaré. |
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Thesaurus Nal: |
ecology; Pantanal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01939naa a2200229 a 4500
001 1788009
005 2017-04-07
008 1993 bl --- 0-- u #d
100 1 $aCAMPOS, Z. M. da S.
245 $aEffect of habitat on survival of eggs and sex ratio of hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil.
260 $c1993
520 $aFlooding of nests and predation were identified as the major mortality agents of eggs of Caiman crocodilus yacare in Brazil. Nests on floating grass mats and in forest were flooded in 1989, but only floating grass mats nests were flooded in 1990. Predation on eggs was high in forest nests, but my presence may have increased predation. No nest on floating grass mats was attacked by predators. The period of sex determination of C.c.yacare can extend to 40 days of incubation. I predicted nest temperature with a multiple regression model incorporating weather variables during incubation. The predicted nest temperatures for nests on floating grass mats and nests in forest were correlated with the sex ratio of the clutch. High nest temperatures ( > 315 C) produced mostly males, and low nest temperatures ( < 305 C) produced only females. The estimated sex ratio varied between years in nests on floating grass mats, but not in forest nests. Estimated nest temperatures significantly affected the snout-vent lengths of hatchlings but not their masses. Fifty percent of nesting occurred on floating grass mats, so the destruction of this habitat by introduced animals such as the water buffalo (Bubalus babalis) will adversely affect the productivity and hence long-term density of caimans in the Pantanal.
650 $aecology
650 $aPantanal
650 $aEcologia
650 $aHabitat
650 $aJacaré
653 $aPreservacao
653 $aPreservation
653 $aSurvival
653 $aYacare
773 $tJournal of Herpetology$gv.27, n.2, p.127-132, 1993.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Soja. |
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Data corrente: |
12/11/2008 |
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Data da última atualização: |
12/11/2008 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
PAIVA, E.; NEPOMUCENO, A. L. |
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Título: |
OGMs na agricultura brasileira e mundial. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: FALEIRO, F. G.; FARIAS NETO, A. L. de (Ed.). Savanas: desafios e estratégias para o equilíbrio entre sociedade, agronegócio e recursos naturais. Planaltina, DF: Embrapa Cerrados, 2008. cap. 24, p. 795-810. |
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Idioma: |
Português |
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Conteúdo: |
There is no more doubt that the world's food production systems are overloaded and unstable. The cycle of cheap food and overabundance has nearly reached its limit as a result of economic growth of very populations countries such as China, India, Brazil, decrease in food production due to global warning and the employment of unsustainable agriculture practices in food production. The adoption of biotech crops associated with good traditional farming practices is being considered a top priority in any country that whishes to have food security (quantity and quality) associated with environmental protection. The future for biotech crops looks encouraging all over world. In 2007, there were 23 countries planting biotech crops in an area that reached 114.3 million hectares. The first dozen years of biotech crops commercialization have provided substantial economical and environmental benefits to rich and poor farmers in both industrial and developing countries. Brazil is the third largest adopter of biotech crops in the world, cultivating an area of 15 million hectares, of which 14.5 million hectares were planted with soybean resistant to the herbicide glyphosate and 0.5 million hectares with cotton tolerant to insects. However, the design and implementation of the biosafety regulatory system in the country is being very difficult and slowly done. The reason for this, are the aggressive actions of "environmental groups" which are against the technology. They have being very efficient in scaring and misinforming judges and politicians, delaying a more quickly and rational adoption of the biotech crops in Brazil. This delay had already resulted in large economical, technological and environmental loses to the country. MenosThere is no more doubt that the world's food production systems are overloaded and unstable. The cycle of cheap food and overabundance has nearly reached its limit as a result of economic growth of very populations countries such as China, India, Brazil, decrease in food production due to global warning and the employment of unsustainable agriculture practices in food production. The adoption of biotech crops associated with good traditional farming practices is being considered a top priority in any country that whishes to have food security (quantity and quality) associated with environmental protection. The future for biotech crops looks encouraging all over world. In 2007, there were 23 countries planting biotech crops in an area that reached 114.3 million hectares. The first dozen years of biotech crops commercialization have provided substantial economical and environmental benefits to rich and poor farmers in both industrial and developing countries. Brazil is the third largest adopter of biotech crops in the world, cultivating an area of 15 million hectares, of which 14.5 million hectares were planted with soybean resistant to the herbicide glyphosate and 0.5 million hectares with cotton tolerant to insects. However, the design and implementation of the biosafety regulatory system in the country is being very difficult and slowly done. The reason for this, are the aggressive actions of "environmental groups" which are against the technology. They have being very effi... Mostrar Tudo |
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Palavras-Chave: |
Bioatecnologia; Transgênico. |
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Thesagro: |
Biossegurança; Engenharia Genética. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02376naa a2200181 a 4500
001 1571523
005 2008-11-12
008 2008 bl uuuu u00u1 u #d
100 1 $aPAIVA, E.
245 $aOGMs na agricultura brasileira e mundial.
260 $c2008
520 $aThere is no more doubt that the world's food production systems are overloaded and unstable. The cycle of cheap food and overabundance has nearly reached its limit as a result of economic growth of very populations countries such as China, India, Brazil, decrease in food production due to global warning and the employment of unsustainable agriculture practices in food production. The adoption of biotech crops associated with good traditional farming practices is being considered a top priority in any country that whishes to have food security (quantity and quality) associated with environmental protection. The future for biotech crops looks encouraging all over world. In 2007, there were 23 countries planting biotech crops in an area that reached 114.3 million hectares. The first dozen years of biotech crops commercialization have provided substantial economical and environmental benefits to rich and poor farmers in both industrial and developing countries. Brazil is the third largest adopter of biotech crops in the world, cultivating an area of 15 million hectares, of which 14.5 million hectares were planted with soybean resistant to the herbicide glyphosate and 0.5 million hectares with cotton tolerant to insects. However, the design and implementation of the biosafety regulatory system in the country is being very difficult and slowly done. The reason for this, are the aggressive actions of "environmental groups" which are against the technology. They have being very efficient in scaring and misinforming judges and politicians, delaying a more quickly and rational adoption of the biotech crops in Brazil. This delay had already resulted in large economical, technological and environmental loses to the country.
650 $aBiossegurança
650 $aEngenharia Genética
653 $aBioatecnologia
653 $aTransgênico
700 1 $aNEPOMUCENO, A. L.
773 $tIn: FALEIRO, F. G.; FARIAS NETO, A. L. de (Ed.). Savanas: desafios e estratégias para o equilíbrio entre sociedade, agronegócio e recursos naturais. Planaltina, DF: Embrapa Cerrados, 2008. cap. 24, p. 795-810.
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