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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
20/02/2017 |
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Data da última atualização: |
20/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
WU, J.; GUAN, K.; HAYEK, M.; RESTREPO-COUPE, N.; WIEDEMANN, K. T.; XU, X.; WEHR, R.; CHRISTOFFERSEN, B. O.; MIAO, G.; SILVA, R. da; ARAUJO, A. C. de; OLIVEIRA JUNIOR, R. C. de; CAMARGO, P. B.; MONSON, R. K.; HUETE, A. R.; SALESKA, S. R. |
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Afiliação: |
JIN WU, University of Arizona; KAIYU GUAN, University of Illinois at Urbana Champaign; MATTHEW HAYEK, Harvard University; NATALIA RESTREPO-COUPE, University of Arizona / University of Technology Sydney; KENIA T. WIEDEMANN, University of Arizona / Harvard University; XIANGTAO XU, Princeton University; RICHARD WEHR, University of Arizona; BRADLEY O. CHRISTOFFERSEN, University of Arizona / Los Alamos National Laboratory; GUOFANG MIAO, University of Illinois at Urbana Champaign / North Carolina State University at Raleigh; RODRIGO DA SILVA, UFOPA; ALESSANDRO CARIOCA DE ARAUJO, CPATU; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; PLINIO B. CAMARGO, CENA/USP; RUSSELL K. MONSON, University of Arizona; ALFREDO R. HUETE, University of Technology Sydney; SCOTT R. SALESKA, University of Arizona. |
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Título: |
Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Global Change Biology, v. 23, n. 3, p. 1240-1257, Mar. 2017. |
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DOI: |
10.1111/gcb.13509 |
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Idioma: |
Inglês |
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Conteúdo: |
Gross ecosystem productivity (GEP) in tropical forests varies both with the environment and with biotic changes in photosynthetic infrastructure, but our understanding of the relative effects of these factors across timescales is limited. Here, we used a statistical model to partition the variability of seven years of eddy covariance-derived GEP in a central Amazon evergreen forest into two main causes: variation in environmental drivers (solar radiation, diffuse light fraction, and vapor pressure deficit) that interact with model parameters that govern photosynthesis and biotic variation in canopy photosynthetic light-use efficiency associated with changes in the parameters themselves. Our fitted model was able to explain most of the variability in GEP at hourly (R2 = 0.77) to interannual (R2 = 0.80) timescales. At hourly timescales, we found that 75% of observed GEP variability could be attributed to environmental variability. When aggregating GEP to the longer timescales (daily, monthly, and yearly), however, environmental variation explained progressively less GEP variability: At monthly timescales, it explained only 3%, much less than biotic variation in canopy photosynthetic light-use efficiency, which accounted for 63%. These results challenge modeling approaches that assume GEP is primarily controlled by the environment at both short and long timescales. Our approach distinguishing biotic from environmental variability can help to resolve debates about environmental limitations to tropical forest photosynthesis. For example, we found that biotically regulated canopy photosynthetic light-use efficiency (associated with leaf phenology) increased with sunlight during dry seasons (consistent with light but not water limitation of canopy development) but that realized GEP was nonetheless lower relative to its potential efficiency during dry than wet seasons (consistent with water limitation of photosynthesis in given assemblages of leaves). This work highlights the importance of accounting for differential regulation of GEP at different timescales and of identifying the underlying feedbacks and adaptive mechanisms. MenosGross ecosystem productivity (GEP) in tropical forests varies both with the environment and with biotic changes in photosynthetic infrastructure, but our understanding of the relative effects of these factors across timescales is limited. Here, we used a statistical model to partition the variability of seven years of eddy covariance-derived GEP in a central Amazon evergreen forest into two main causes: variation in environmental drivers (solar radiation, diffuse light fraction, and vapor pressure deficit) that interact with model parameters that govern photosynthesis and biotic variation in canopy photosynthetic light-use efficiency associated with changes in the parameters themselves. Our fitted model was able to explain most of the variability in GEP at hourly (R2 = 0.77) to interannual (R2 = 0.80) timescales. At hourly timescales, we found that 75% of observed GEP variability could be attributed to environmental variability. When aggregating GEP to the longer timescales (daily, monthly, and yearly), however, environmental variation explained progressively less GEP variability: At monthly timescales, it explained only 3%, much less than biotic variation in canopy photosynthetic light-use efficiency, which accounted for 63%. These results challenge modeling approaches that assume GEP is primarily controlled by the environment at both short and long timescales. Our approach distinguishing biotic from environmental variability can help to resolve debates about environmental ... Mostrar Tudo |
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Thesagro: |
Fenologia; Fisiologia; Floresta Tropical; Fotossíntese. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 03197naa a2200361 a 4500
001 2064783
005 2022-05-20
008 2017 bl uuuu u00u1 u #d
024 7 $a10.1111/gcb.13509$2DOI
100 1 $aWU, J.
245 $aPartitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales.$h[electronic resource]
260 $c2017
520 $aGross ecosystem productivity (GEP) in tropical forests varies both with the environment and with biotic changes in photosynthetic infrastructure, but our understanding of the relative effects of these factors across timescales is limited. Here, we used a statistical model to partition the variability of seven years of eddy covariance-derived GEP in a central Amazon evergreen forest into two main causes: variation in environmental drivers (solar radiation, diffuse light fraction, and vapor pressure deficit) that interact with model parameters that govern photosynthesis and biotic variation in canopy photosynthetic light-use efficiency associated with changes in the parameters themselves. Our fitted model was able to explain most of the variability in GEP at hourly (R2 = 0.77) to interannual (R2 = 0.80) timescales. At hourly timescales, we found that 75% of observed GEP variability could be attributed to environmental variability. When aggregating GEP to the longer timescales (daily, monthly, and yearly), however, environmental variation explained progressively less GEP variability: At monthly timescales, it explained only 3%, much less than biotic variation in canopy photosynthetic light-use efficiency, which accounted for 63%. These results challenge modeling approaches that assume GEP is primarily controlled by the environment at both short and long timescales. Our approach distinguishing biotic from environmental variability can help to resolve debates about environmental limitations to tropical forest photosynthesis. For example, we found that biotically regulated canopy photosynthetic light-use efficiency (associated with leaf phenology) increased with sunlight during dry seasons (consistent with light but not water limitation of canopy development) but that realized GEP was nonetheless lower relative to its potential efficiency during dry than wet seasons (consistent with water limitation of photosynthesis in given assemblages of leaves). This work highlights the importance of accounting for differential regulation of GEP at different timescales and of identifying the underlying feedbacks and adaptive mechanisms.
650 $aFenologia
650 $aFisiologia
650 $aFloresta Tropical
650 $aFotossíntese
700 1 $aGUAN, K.
700 1 $aHAYEK, M.
700 1 $aRESTREPO-COUPE, N.
700 1 $aWIEDEMANN, K. T.
700 1 $aXU, X.
700 1 $aWEHR, R.
700 1 $aCHRISTOFFERSEN, B. O.
700 1 $aMIAO, G.
700 1 $aSILVA, R. da
700 1 $aARAUJO, A. C. de
700 1 $aOLIVEIRA JUNIOR, R. C. de
700 1 $aCAMARGO, P. B.
700 1 $aMONSON, R. K.
700 1 $aHUETE, A. R.
700 1 $aSALESKA, S. R.
773 $tGlobal Change Biology$gv. 23, n. 3, p. 1240-1257, Mar. 2017.
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Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
14/01/2014 |
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Data da última atualização: |
20/02/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
FERNANDES JÚNIOR, G. A.; LOBO, R. N. B.; MADRUGA, M. S.; LOBO, A. M. B. O.; VIEIRA, L. da S.; FACO, O. |
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Afiliação: |
Universidade Estadual Paulista - Jaboticabal, SP, Brasil; RAIMUNDO NONATO BRAGA LOBO, CNPC; ANA MARIA BEZERRA OLIVEIRA LOBO, CNPC; LUIZ DA SILVA VIEIRA, CNPC; OLIVARDO FACO, CNPC. |
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Título: |
Genotype effect on carcass and meat quality of lambs finished in irrigated pastures in the semiarid Northeastern Brazil. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Arquivo Brasileiro de Medicina Veterinária e Zootecnia, Belo Horizonte, v. 65, n. 4, p. 1208-1216, 2013. |
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DOI: |
http://dx.doi.org/10.1590/S0102-09352013000400037 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The aim of this study was to compare four genetic groups of sheep on the carcass and meat quality traits. Thirty-three contemporary and unrelated male lambs, all of single birth were used in the experiment, being thirteen from the Santa Inês (SI) breed, seven from the Brazilian Somali breed (BS), six from the Morada Nova (MN) breed and seven from the ½ Dorper - ½ Morada Nova (F1) crossbreed. The genotypes SI, BS and F1 presented similar performances in relation to hot and cold carcass weights, which values were 10.76±0.53kg and 10.46±0.52kg for SI, 9.20±0.73kg and 8.99±0.71kg for BS, and 9.35±0.73kg and 9.13±0.71kg for F1, respectively. The BS had a better hot carcass yield (47.10±0.88%) and cold carcass yield (46.00±0.87%). Better carcass conformation was observed in SI and F1 (2.73±0.12 and 2.50±0.17, respectively) while the BS presented a better finishing (3.29±0.20). The average for the rib eye area (REA) was 9.94±0.49cm2, 8.66±0.67cm2, 7.18±0.72cm2 and 9.8±0.67cm2, and for the carcass compactness index (CCI) it was 0.17±0.01kg/cm, 0.17±0.01kg/cm, 0.11±0.01kg/cm and 0.16±0,01kg/cm, for SI, SB, MN and F1, respectively. There were no significant differences between SI, BS and F1 regarding REA and CCI. Although, in general, the MN presented a relatively lower performance than the other genotypes, this breed had similar carcass yields and fat thickness when compared to SI and F1 and similar conformation and REA in comparison to the BS. Regarding meat quality, no differences were observed between genotypes, except for redness and cooking losses. It is concluded that no one group had a higher or lower performance in all traits analyzed. Moreover, for the management conditions employed in this study, there was evidence of greater specialization in meat production for genotypes SI, BS and F1 when compared to MN, although there are no substantial differences between the four groups regarding meat quality [Efeito do genótipo sobre características de carcaça e qualidade da carne de cordeiros terminados em pastagem irrigada no semiárido do Nordeste do Brasil]. Resumo: O objetivo deste estudo foi comparar quatro grupos genéticos de ovinos quanto às características de carcaça e de qualidade da carne. Trinta e três cordeiros, contemporâneos, nascidos de parto simples e sem relação de parentesco, foram utilizados no experimento, sendo 13 da raça Santa Inês (SI), sete da raça Somalis Brasileira (SB), seis da raça Morada Nova (MN) e sete ½ Dorper - ½ Morada Nova (F1). Os genótipos SI, SB e F1 apresentaram desempenhos similares quanto ao peso das carcaças quente e fria, cujos valores foram 10,76±0,53kg e 10,46±0,52kg para o SI, 9,20±0,73kg e 8,99±0,71kg para o SB, 9,35±0,73kg e 9,13±0,71kg para o F1, respectivamente. A raça SB apresentou melhor rendimento de carcaça quente (47,10 ±0,88%) e de carcaça fria (46,00±0,87%). Os genótipos SI e F1 apresentaram melhores conformações (2,73±0,12 e 2,50±0,17, respectivamente), enquanto o SB apresentou melhor acabamento (3,29±0,20). As médias para área de olho de lombo (AOL) foram 9,94±0,49cm2, 8,66±0,67cm2, 7,18±0,72cm2 e 9,8±0,67cm2 e para o índice de compacidade da carcaça (ICC) foram 0,17±0,01kg/cm, 0,17±0,01kg/cm, 0,11±0,01kg/cm e 0,16±0,01kg/cm, para SI, SB, MN e F1, respectivamente. Não houve diferença significativa entre os genótipos SI, SB e F1 quanto à AOL e ao ICC. Apesar de, no geral, a raça MN apresentar desempenho relativamente inferior aos demais genótipos quanto às características de carcaça analisadas, essa raça apresentou rendimentos de carcaça e espessura de gordura similar ao SI e F1 e conformação e AOL similar ao SB. Não houve um grupo superior ou inferior para todas as características analisadas. Por outro lado, para as condições de manejo empregadas neste estudo, evidenciou-se maior especialização para produção de carne dos genótipos SI, SB e F1 em relação ao grupo MN. Não houve diferenças importantes entre os diferentes genótipos quanto à qualidade da carne. MenosAbstract: The aim of this study was to compare four genetic groups of sheep on the carcass and meat quality traits. Thirty-three contemporary and unrelated male lambs, all of single birth were used in the experiment, being thirteen from the Santa Inês (SI) breed, seven from the Brazilian Somali breed (BS), six from the Morada Nova (MN) breed and seven from the ½ Dorper - ½ Morada Nova (F1) crossbreed. The genotypes SI, BS and F1 presented similar performances in relation to hot and cold carcass weights, which values were 10.76±0.53kg and 10.46±0.52kg for SI, 9.20±0.73kg and 8.99±0.71kg for BS, and 9.35±0.73kg and 9.13±0.71kg for F1, respectively. The BS had a better hot carcass yield (47.10±0.88%) and cold carcass yield (46.00±0.87%). Better carcass conformation was observed in SI and F1 (2.73±0.12 and 2.50±0.17, respectively) while the BS presented a better finishing (3.29±0.20). The average for the rib eye area (REA) was 9.94±0.49cm2, 8.66±0.67cm2, 7.18±0.72cm2 and 9.8±0.67cm2, and for the carcass compactness index (CCI) it was 0.17±0.01kg/cm, 0.17±0.01kg/cm, 0.11±0.01kg/cm and 0.16±0,01kg/cm, for SI, SB, MN and F1, respectively. There were no significant differences between SI, BS and F1 regarding REA and CCI. Although, in general, the MN presented a relatively lower performance than the other genotypes, this breed had similar carcass yields and fat thickness when compared to SI and F1 and similar conformation and REA in comparison to the BS. Regarding meat quality, no di... Mostrar Tudo |
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Palavras-Chave: |
Carcass yields; Commercial cuts; Cortes comerciais; Força de cisalhamento; Irrigated grass; Pastagem irrigada; Rendimento de carcaça; Shear force. |
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Thesagro: |
Carcaça; Carne; Confinamento; Cordeiro; Genótipo; Ovino; Qualidade; Terminação. |
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Thesaurus NAL: |
Lamb meat; Mutton; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/95240/1/api-Genotype-effect-on-carcass-and-meat.pdf
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Marc: |
LEADER 05339naa a2200421 a 4500
001 1975992
005 2015-02-20
008 2013 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1590/S0102-09352013000400037$2DOI
100 1 $aFERNANDES JÚNIOR, G. A.
245 $aGenotype effect on carcass and meat quality of lambs finished in irrigated pastures in the semiarid Northeastern Brazil.$h[electronic resource]
260 $c2013
520 $aAbstract: The aim of this study was to compare four genetic groups of sheep on the carcass and meat quality traits. Thirty-three contemporary and unrelated male lambs, all of single birth were used in the experiment, being thirteen from the Santa Inês (SI) breed, seven from the Brazilian Somali breed (BS), six from the Morada Nova (MN) breed and seven from the ½ Dorper - ½ Morada Nova (F1) crossbreed. The genotypes SI, BS and F1 presented similar performances in relation to hot and cold carcass weights, which values were 10.76±0.53kg and 10.46±0.52kg for SI, 9.20±0.73kg and 8.99±0.71kg for BS, and 9.35±0.73kg and 9.13±0.71kg for F1, respectively. The BS had a better hot carcass yield (47.10±0.88%) and cold carcass yield (46.00±0.87%). Better carcass conformation was observed in SI and F1 (2.73±0.12 and 2.50±0.17, respectively) while the BS presented a better finishing (3.29±0.20). The average for the rib eye area (REA) was 9.94±0.49cm2, 8.66±0.67cm2, 7.18±0.72cm2 and 9.8±0.67cm2, and for the carcass compactness index (CCI) it was 0.17±0.01kg/cm, 0.17±0.01kg/cm, 0.11±0.01kg/cm and 0.16±0,01kg/cm, for SI, SB, MN and F1, respectively. There were no significant differences between SI, BS and F1 regarding REA and CCI. Although, in general, the MN presented a relatively lower performance than the other genotypes, this breed had similar carcass yields and fat thickness when compared to SI and F1 and similar conformation and REA in comparison to the BS. Regarding meat quality, no differences were observed between genotypes, except for redness and cooking losses. It is concluded that no one group had a higher or lower performance in all traits analyzed. Moreover, for the management conditions employed in this study, there was evidence of greater specialization in meat production for genotypes SI, BS and F1 when compared to MN, although there are no substantial differences between the four groups regarding meat quality [Efeito do genótipo sobre características de carcaça e qualidade da carne de cordeiros terminados em pastagem irrigada no semiárido do Nordeste do Brasil]. Resumo: O objetivo deste estudo foi comparar quatro grupos genéticos de ovinos quanto às características de carcaça e de qualidade da carne. Trinta e três cordeiros, contemporâneos, nascidos de parto simples e sem relação de parentesco, foram utilizados no experimento, sendo 13 da raça Santa Inês (SI), sete da raça Somalis Brasileira (SB), seis da raça Morada Nova (MN) e sete ½ Dorper - ½ Morada Nova (F1). Os genótipos SI, SB e F1 apresentaram desempenhos similares quanto ao peso das carcaças quente e fria, cujos valores foram 10,76±0,53kg e 10,46±0,52kg para o SI, 9,20±0,73kg e 8,99±0,71kg para o SB, 9,35±0,73kg e 9,13±0,71kg para o F1, respectivamente. A raça SB apresentou melhor rendimento de carcaça quente (47,10 ±0,88%) e de carcaça fria (46,00±0,87%). Os genótipos SI e F1 apresentaram melhores conformações (2,73±0,12 e 2,50±0,17, respectivamente), enquanto o SB apresentou melhor acabamento (3,29±0,20). As médias para área de olho de lombo (AOL) foram 9,94±0,49cm2, 8,66±0,67cm2, 7,18±0,72cm2 e 9,8±0,67cm2 e para o índice de compacidade da carcaça (ICC) foram 0,17±0,01kg/cm, 0,17±0,01kg/cm, 0,11±0,01kg/cm e 0,16±0,01kg/cm, para SI, SB, MN e F1, respectivamente. Não houve diferença significativa entre os genótipos SI, SB e F1 quanto à AOL e ao ICC. Apesar de, no geral, a raça MN apresentar desempenho relativamente inferior aos demais genótipos quanto às características de carcaça analisadas, essa raça apresentou rendimentos de carcaça e espessura de gordura similar ao SI e F1 e conformação e AOL similar ao SB. Não houve um grupo superior ou inferior para todas as características analisadas. Por outro lado, para as condições de manejo empregadas neste estudo, evidenciou-se maior especialização para produção de carne dos genótipos SI, SB e F1 em relação ao grupo MN. Não houve diferenças importantes entre os diferentes genótipos quanto à qualidade da carne.
650 $aLamb meat
650 $aMutton
650 $aSheep
650 $aCarcaça
650 $aCarne
650 $aConfinamento
650 $aCordeiro
650 $aGenótipo
650 $aOvino
650 $aQualidade
650 $aTerminação
653 $aCarcass yields
653 $aCommercial cuts
653 $aCortes comerciais
653 $aForça de cisalhamento
653 $aIrrigated grass
653 $aPastagem irrigada
653 $aRendimento de carcaça
653 $aShear force
700 1 $aLOBO, R. N. B.
700 1 $aMADRUGA, M. S.
700 1 $aLOBO, A. M. B. O.
700 1 $aVIEIRA, L. da S.
700 1 $aFACO, O.
773 $tArquivo Brasileiro de Medicina Veterinária e Zootecnia, Belo Horizonte$gv. 65, n. 4, p. 1208-1216, 2013.
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