| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
20/04/1998 |
|
Data da última atualização: |
15/03/2006 |
|
Autoria: |
LEE, J. C. |
|
Título: |
Reproduction and hybridization of three cichlid fishes, Tilapia aurea (Steindachner), T. hornorum trewavas and T. nilotica (Linnaeus) in aquaria and in plastic pools. |
|
Ano de publicação: |
1979 |
|
Fonte/Imprenta: |
Alburn: Alburn University, 1979. |
|
Páginas: |
84p. |
|
Idioma: |
Inglês |
|
Notas: |
Ph.D. Dissetation. |
|
Conteúdo: |
Reproduction and hbridization of three species of Tilapia, T. aurea (Steindachner), T. Trewavas, and T. nilotica (Linnaeus) were studies in aquaria and plastic polls. The spawning activities of territorial behavior, nest building, courtship, and mouth brooding were observed. There were no differencen in the basic courtshisp courtship pattern among these species, but some quantitative variations were observed. Eggs produced by the females in the aquaria were removed and incubated artificially using a shaker table. Erooding efficiency of the shaker table was quit high; hatchnig rates between 74.0 and 96.25% for T. surea and between 78.4 and 94.3% for T. nilotica were obtained. Two other types of agg incubating facilities, hatching jara water current and with aeration, hat also been tested and showed relatively low brooding afficiency. A new technique for reducing the mortality of female brooders caused male aggression under aquarium conditions was developed during the research. The technique, removal of the premaxilla of the male brooders, was proven to be quite effective in prevention of female mortality. All the six two-way crosses among the trree tilapias were produced. Two three-way crosses between female hybrids of T. sumea and T. hornorum and T. nilotica were also produced. Only the hybrids between female T. nilotica and male T. hornorum were found to be all males. Incompatibility was observed in certain crosses which incolved T. nilotica as the female parent. It was suggeestad that the incompatibility was a consequence of activity at the benaviorial level. The hybrids apawned and yielded F2 hybrids. The fry production inicated that the reproductive fertility was maintained. Col tolerance of different species and heir hybrids was tasted in a controlled environmet. Significant differences were found between groups the and the greatast cold tolarance appeared to be a specific attribute of T. surea, and this trait was transmitted to the hybrids through some types of maternal inheritance. MenosReproduction and hbridization of three species of Tilapia, T. aurea (Steindachner), T. Trewavas, and T. nilotica (Linnaeus) were studies in aquaria and plastic polls. The spawning activities of territorial behavior, nest building, courtship, and mouth brooding were observed. There were no differencen in the basic courtshisp courtship pattern among these species, but some quantitative variations were observed. Eggs produced by the females in the aquaria were removed and incubated artificially using a shaker table. Erooding efficiency of the shaker table was quit high; hatchnig rates between 74.0 and 96.25% for T. surea and between 78.4 and 94.3% for T. nilotica were obtained. Two other types of agg incubating facilities, hatching jara water current and with aeration, hat also been tested and showed relatively low brooding afficiency. A new technique for reducing the mortality of female brooders caused male aggression under aquarium conditions was developed during the research. The technique, removal of the premaxilla of the male brooders, was proven to be quite effective in prevention of female mortality. All the six two-way crosses among the trree tilapias were produced. Two three-way crosses between female hybrids of T. sumea and T. hornorum and T. nilotica were also produced. Only the hybrids between female T. nilotica and male T. hornorum were found to be all males. Incompatibility was observed in certain crosses which incolved T. nilotica as the female parent. It was sug... Mostrar Tudo |
|
Palavras-Chave: |
Tilapia aurea; Tilapia hornorum. |
|
Thesagro: |
Hibridação; Peixe; Reprodução; Tilápia Nilótica. |
|
Thesaurus Nal: |
fish; hybridization; reproduction. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02734nam a2200241 a 4500
001 1401896
005 2006-03-15
008 1979 bl uuuu m 00u1 u #d
100 1 $aLEE, J. C.
245 $aReproduction and hybridization of three cichlid fishes, Tilapia aurea (Steindachner), T. hornorum trewavas and T. nilotica (Linnaeus) in aquaria and in plastic pools.
260 $aAlburn: Alburn University$c1979
300 $a84p.
500 $aPh.D. Dissetation.
520 $aReproduction and hbridization of three species of Tilapia, T. aurea (Steindachner), T. Trewavas, and T. nilotica (Linnaeus) were studies in aquaria and plastic polls. The spawning activities of territorial behavior, nest building, courtship, and mouth brooding were observed. There were no differencen in the basic courtshisp courtship pattern among these species, but some quantitative variations were observed. Eggs produced by the females in the aquaria were removed and incubated artificially using a shaker table. Erooding efficiency of the shaker table was quit high; hatchnig rates between 74.0 and 96.25% for T. surea and between 78.4 and 94.3% for T. nilotica were obtained. Two other types of agg incubating facilities, hatching jara water current and with aeration, hat also been tested and showed relatively low brooding afficiency. A new technique for reducing the mortality of female brooders caused male aggression under aquarium conditions was developed during the research. The technique, removal of the premaxilla of the male brooders, was proven to be quite effective in prevention of female mortality. All the six two-way crosses among the trree tilapias were produced. Two three-way crosses between female hybrids of T. sumea and T. hornorum and T. nilotica were also produced. Only the hybrids between female T. nilotica and male T. hornorum were found to be all males. Incompatibility was observed in certain crosses which incolved T. nilotica as the female parent. It was suggeestad that the incompatibility was a consequence of activity at the benaviorial level. The hybrids apawned and yielded F2 hybrids. The fry production inicated that the reproductive fertility was maintained. Col tolerance of different species and heir hybrids was tasted in a controlled environmet. Significant differences were found between groups the and the greatast cold tolarance appeared to be a specific attribute of T. surea, and this trait was transmitted to the hybrids through some types of maternal inheritance.
650 $afish
650 $ahybridization
650 $areproduction
650 $aHibridação
650 $aPeixe
650 $aReprodução
650 $aTilápia Nilótica
653 $aTilapia aurea
653 $aTilapia hornorum
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Suínos e Aves. Para informações adicionais entre em contato com cnpsa.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Suínos e Aves. |
|
Data corrente: |
10/08/2021 |
|
Data da última atualização: |
10/08/2021 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
NICOLOSO, R. da S.; RICE, C. W. |
|
Afiliação: |
RODRIGO DA SILVEIRA NICOLOSO, CNPSA; CHARLES W. RICE, Kansas State University. |
|
Título: |
Intensification of no-till agricultural systems: an opportunity for carbon sequestration. |
|
Ano de publicação: |
2021 |
|
Fonte/Imprenta: |
Soil Science Society of America Journal, 20 Apr. 2021. |
|
DOI: |
https://doi.org/10.1002/saj2.20260 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Abstract: The ?4 per 1,000? initiative was launched at the 21st Conference of the Parties (COP21) stimulating a long-standing debate on the potential of no-till (NT) to promote soil C sequestration. Previous reviews found little or no soil organic C (SOC) accrual in NT soils as compared with full inversion tillage when soils are sampled deeper than 30 cm. Here, we present the results of a global meta-analysis of studies assessing SOC and total N (TN) storage and dynamics in NT and tilled soils from the most important agricultural regions of the world. Overall, our results show that NT soils stored 6.7 ± 1.9 Mg C ha?1 and 1.1 ± 0.4 Mg N ha?1 more than tilled soils (0-to-100-cm depth) with an average of 16 yr of NT, in contrast with previous findings. However, C sequestration (+4.7 ± 1.9 Mg C ha?1 in the 0-to-60-cm depth with an average of 11 yr of NT) depended on the association of NT with increased crop frequency and the inclusion of legumes cover crops. Single-cropping systems lack the necessary C inputs to offset SOC losses in the soil profile (below 30-cm depth). However, double-cropping systems decreased soil TN that may constrain future C sequestration. The use of legumes alleviated TN loss and supported soil C sequestration. Briefly, our findings indicate that NT can avoid SOC losses from tilled soils, partially offsetting CO2 emissions from agriculture. Moreover, NT with agricultural intensification can promote soil C sequestration, thus contributing to soil quality, food security, and adaptation to climate change. MenosAbstract: The ?4 per 1,000? initiative was launched at the 21st Conference of the Parties (COP21) stimulating a long-standing debate on the potential of no-till (NT) to promote soil C sequestration. Previous reviews found little or no soil organic C (SOC) accrual in NT soils as compared with full inversion tillage when soils are sampled deeper than 30 cm. Here, we present the results of a global meta-analysis of studies assessing SOC and total N (TN) storage and dynamics in NT and tilled soils from the most important agricultural regions of the world. Overall, our results show that NT soils stored 6.7 ± 1.9 Mg C ha?1 and 1.1 ± 0.4 Mg N ha?1 more than tilled soils (0-to-100-cm depth) with an average of 16 yr of NT, in contrast with previous findings. However, C sequestration (+4.7 ± 1.9 Mg C ha?1 in the 0-to-60-cm depth with an average of 11 yr of NT) depended on the association of NT with increased crop frequency and the inclusion of legumes cover crops. Single-cropping systems lack the necessary C inputs to offset SOC losses in the soil profile (below 30-cm depth). However, double-cropping systems decreased soil TN that may constrain future C sequestration. The use of legumes alleviated TN loss and supported soil C sequestration. Briefly, our findings indicate that NT can avoid SOC losses from tilled soils, partially offsetting CO2 emissions from agriculture. Moreover, NT with agricultural intensification can promote soil C sequestration, thus contributing to soil quality, ... Mostrar Tudo |
|
Palavras-Chave: |
Agricultural systems; Sistemas agrícolas. |
|
Thesagro: |
Carbono; Plantio Direto; Solo. |
|
Thesaurus NAL: |
Greenhouse gas emissions; Greenhouse soils; No-tillage. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02279naa a2200241 a 4500
001 2133401
005 2021-08-10
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1002/saj2.20260$2DOI
100 1 $aNICOLOSO, R. da S.
245 $aIntensification of no-till agricultural systems$ban opportunity for carbon sequestration.$h[electronic resource]
260 $c2021
520 $aAbstract: The ?4 per 1,000? initiative was launched at the 21st Conference of the Parties (COP21) stimulating a long-standing debate on the potential of no-till (NT) to promote soil C sequestration. Previous reviews found little or no soil organic C (SOC) accrual in NT soils as compared with full inversion tillage when soils are sampled deeper than 30 cm. Here, we present the results of a global meta-analysis of studies assessing SOC and total N (TN) storage and dynamics in NT and tilled soils from the most important agricultural regions of the world. Overall, our results show that NT soils stored 6.7 ± 1.9 Mg C ha?1 and 1.1 ± 0.4 Mg N ha?1 more than tilled soils (0-to-100-cm depth) with an average of 16 yr of NT, in contrast with previous findings. However, C sequestration (+4.7 ± 1.9 Mg C ha?1 in the 0-to-60-cm depth with an average of 11 yr of NT) depended on the association of NT with increased crop frequency and the inclusion of legumes cover crops. Single-cropping systems lack the necessary C inputs to offset SOC losses in the soil profile (below 30-cm depth). However, double-cropping systems decreased soil TN that may constrain future C sequestration. The use of legumes alleviated TN loss and supported soil C sequestration. Briefly, our findings indicate that NT can avoid SOC losses from tilled soils, partially offsetting CO2 emissions from agriculture. Moreover, NT with agricultural intensification can promote soil C sequestration, thus contributing to soil quality, food security, and adaptation to climate change.
650 $aGreenhouse gas emissions
650 $aGreenhouse soils
650 $aNo-tillage
650 $aCarbono
650 $aPlantio Direto
650 $aSolo
653 $aAgricultural systems
653 $aSistemas agrícolas
700 1 $aRICE, C. W.
773 $tSoil Science Society of America Journal, 20 Apr. 2021.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Suínos e Aves (CNPSA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
