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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
11/09/2020 |
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Data da última atualização: |
11/09/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CURTO, R. De A.; MATTOS, P. P. de; BRAZ, E. M.; CANETTI, A.; PÉLLICO NETTO, S. |
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Afiliação: |
Rafaella De Angeli Curto, UFRJ; PATRICIA POVOA DE MATTOS, CNPF; EVALDO MUNOZ BRAZ, CNPF; Aline Canetti, Consultora florestal; Sylvio Péllico Netto, UFPR. |
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Título: |
Effectiveness of competition indices for understanding growth in an overstocked stand. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Forest Ecology and Management , v. 477, 118472, 2020. 11 p. |
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DOI: |
https://doi.org/10.1016/j.foreco.2020.118472 |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this study was to select and discuss indices to explain competition among trees in an unmanaged stand in order to support decision-making in forest management. The work was carried out in a plantation of Araucaria angustifolia (Bertol.) Kuntze located in a national forest in southern Brazil. The plantation was established in 1946 in 2 × 2 m spacing, with only one thinning that happened sometime between 1970 and 1980. Forty-six sample plots were established using an adaptation of the Prodan method. We tested distance-independent and distance-dependent competition indices that included or excluded crown area variables. An equation was generated to describe the relation between diameter at breast height and crown diameter, since these were highly correlated (r = 0.87); this permitted calculation of the growth space required for the trees in the stand. It is important to carefully choose the variables and competition indices to be tested in each study case. Including crown variables did not improve prediction ability to overcome the performance of the Stage distance-independent index. In general, the distance-independent indices performed better than the distance-dependent ones, even the stand arrangement in our study area was modified through thinning, mortality, and natural regeneration. When the goal is to better understand the ecological significance of a competition index and not only its statistical ability to predict short-term growth, simpler indices are recommended. MenosThe objective of this study was to select and discuss indices to explain competition among trees in an unmanaged stand in order to support decision-making in forest management. The work was carried out in a plantation of Araucaria angustifolia (Bertol.) Kuntze located in a national forest in southern Brazil. The plantation was established in 1946 in 2 × 2 m spacing, with only one thinning that happened sometime between 1970 and 1980. Forty-six sample plots were established using an adaptation of the Prodan method. We tested distance-independent and distance-dependent competition indices that included or excluded crown area variables. An equation was generated to describe the relation between diameter at breast height and crown diameter, since these were highly correlated (r = 0.87); this permitted calculation of the growth space required for the trees in the stand. It is important to carefully choose the variables and competition indices to be tested in each study case. Including crown variables did not improve prediction ability to overcome the performance of the Stage distance-independent index. In general, the distance-independent indices performed better than the distance-dependent ones, even the stand arrangement in our study area was modified through thinning, mortality, and natural regeneration. When the goal is to better understand the ecological significance of a competition index and not only its statistical ability to predict short-term growth, simpler indices are... Mostrar Tudo |
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Palavras-Chave: |
Growing space; Manejo florestal. |
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Thesagro: |
Araucária Angustifólia; Crescimento; Espécie Nativa; Pinheiro do Paraná. |
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Thesaurus Nal: |
Forest management. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02330naa a2200265 a 4500
001 2124864
005 2020-09-11
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.foreco.2020.118472$2DOI
100 1 $aCURTO, R. De A.
245 $aEffectiveness of competition indices for understanding growth in an overstocked stand.$h[electronic resource]
260 $c2020
520 $aThe objective of this study was to select and discuss indices to explain competition among trees in an unmanaged stand in order to support decision-making in forest management. The work was carried out in a plantation of Araucaria angustifolia (Bertol.) Kuntze located in a national forest in southern Brazil. The plantation was established in 1946 in 2 × 2 m spacing, with only one thinning that happened sometime between 1970 and 1980. Forty-six sample plots were established using an adaptation of the Prodan method. We tested distance-independent and distance-dependent competition indices that included or excluded crown area variables. An equation was generated to describe the relation between diameter at breast height and crown diameter, since these were highly correlated (r = 0.87); this permitted calculation of the growth space required for the trees in the stand. It is important to carefully choose the variables and competition indices to be tested in each study case. Including crown variables did not improve prediction ability to overcome the performance of the Stage distance-independent index. In general, the distance-independent indices performed better than the distance-dependent ones, even the stand arrangement in our study area was modified through thinning, mortality, and natural regeneration. When the goal is to better understand the ecological significance of a competition index and not only its statistical ability to predict short-term growth, simpler indices are recommended.
650 $aForest management
650 $aAraucária Angustifólia
650 $aCrescimento
650 $aEspécie Nativa
650 $aPinheiro do Paraná
653 $aGrowing space
653 $aManejo florestal
700 1 $aMATTOS, P. P. de
700 1 $aBRAZ, E. M.
700 1 $aCANETTI, A.
700 1 $aPÉLLICO NETTO, S.
773 $tForest Ecology and Management$gv. 477, 118472, 2020. 11 p.
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Registro original: |
Embrapa Florestas (CNPF) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite; Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
03/02/2011 |
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Data da última atualização: |
24/03/2023 |
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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: |
PEIXOTO, M. G. C. D.; POGGIAN, C. F.; VERNEQUE, R. da S.; EGITO, A. A. do; CARVALHO, M. R. S.; PENNA, V. M.; BERGMANN, J. A. G.; VICCINI, L. F.; MACHADO, M. A. |
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Afiliação: |
MARIA GABRIELA CAMPOLINA D PEIXOTO, CNPGL; CECÍLIA FONSECA POGGIAN, UFJF; RUI DA SILVA VERNEQUE, CNPGL; ANDREA ALVES DO EGITO, CNPGC; MARIA RAQUEL SANTOS CARVALHO, UFMG; VÂNIA MALDINI PENNA, CBMG; JOSÉ AURÉLIO GARCIA BERGMANN, UFMG; LYDERSON FACIO VICCINI, UFJF; MARCO ANTONIO MACHADO, CNPGL. |
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Título: |
Genetic basis and inbreeding in the Brazilian Guzerat (Bos indicus) subpopulation selected for milk production. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Livestock Science, v. 131, n. 2/3, p. 168-174, 2010. |
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DOI: |
https://doi.org/10.1016/j.livsci.2010.03.015 |
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Idioma: |
Inglês |
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Conteúdo: |
The Guzerat breed is well adapted to the tropical conditions of Brazil. After 1940, the widespread use of Guzerat cattle for crossing has reduced its population size. In 1994, a selection program for milk production traits was initiated in some purebred herds. However, its success is compromised by genetic drift and an increased inbreeding coefficient (F). The objective of this study was to evaluate the genetic status of the Guzerat population under selection for milk production in order to monitor genetic variability. Genealogical data from 10,051 animals were used to estimate genetic parameters. The average F for all animals and for inbred animals in the pedigree was 0.009 and 0.025, respectively. Average relatedness was 0.011. The average generation interval was 7.48 years and the linear increase in F per generation was 0.0051. There was no trend of changes in the effective population size along generations, with the observation of an effective size of 98 in the last generation evaluated. The effective number of founders and ancestors was 318 and 101, respectively. Only 47 of 2106 ancestors contributed to 50% of the reference population. The bottleneck effect was 3.15. Average F and relatedness values are still low despite non-random mating. However, the reduced effective population size and effective number of ancestors indicate a risk of an increase in the inbreeding coefficient and genetic drift and consequent loss of variability. |
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Palavras-Chave: |
Effective population size; Genetic variability; Zebu cattle. |
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Thesaurus NAL: |
inbreeding coefficient. |
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Categoria do assunto: |
--
G Melhoramento Genético |
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Marc: |
LEADER 02347naa a2200277 a 4500
001 1881310
005 2023-03-24
008 2010 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.livsci.2010.03.015$2DOI
100 1 $aPEIXOTO, M. G. C. D.
245 $aGenetic basis and inbreeding in the Brazilian Guzerat (Bos indicus) subpopulation selected for milk production.$h[electronic resource]
260 $c2010
520 $aThe Guzerat breed is well adapted to the tropical conditions of Brazil. After 1940, the widespread use of Guzerat cattle for crossing has reduced its population size. In 1994, a selection program for milk production traits was initiated in some purebred herds. However, its success is compromised by genetic drift and an increased inbreeding coefficient (F). The objective of this study was to evaluate the genetic status of the Guzerat population under selection for milk production in order to monitor genetic variability. Genealogical data from 10,051 animals were used to estimate genetic parameters. The average F for all animals and for inbred animals in the pedigree was 0.009 and 0.025, respectively. Average relatedness was 0.011. The average generation interval was 7.48 years and the linear increase in F per generation was 0.0051. There was no trend of changes in the effective population size along generations, with the observation of an effective size of 98 in the last generation evaluated. The effective number of founders and ancestors was 318 and 101, respectively. Only 47 of 2106 ancestors contributed to 50% of the reference population. The bottleneck effect was 3.15. Average F and relatedness values are still low despite non-random mating. However, the reduced effective population size and effective number of ancestors indicate a risk of an increase in the inbreeding coefficient and genetic drift and consequent loss of variability.
650 $ainbreeding coefficient
653 $aEffective population size
653 $aGenetic variability
653 $aZebu cattle
700 1 $aPOGGIAN, C. F.
700 1 $aVERNEQUE, R. da S.
700 1 $aEGITO, A. A. do
700 1 $aCARVALHO, M. R. S.
700 1 $aPENNA, V. M.
700 1 $aBERGMANN, J. A. G.
700 1 $aVICCINI, L. F.
700 1 $aMACHADO, M. A.
773 $tLivestock Science$gv. 131, n. 2/3, p. 168-174, 2010.
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