Data/hora: 15/06/2024 11:35:59

Biblioteca(s): | Embrapa Acre; Embrapa Amazônia Oriental; Embrapa Florestas.
Data corrente: | 26/08/2011
Data da última atualização: | 24/03/2015
Autoria: | CARNEIRO, F. S.; LACERDA, A. E. B. de; LEMES, M. R.; GRIBEL, R.; KANASHIRO, M.; WADT, L. H. O.; SEBBENN, A. M.
Afiliação: | F. S. Carneiro, UNESP; ANDRE EDUARDO BISCAIA DE LACERDA, CNPF; M. R. Lemes, INPA; R. Gribel, INPA; MILTON KANASHIRO, CPATU; LUCIA HELENA DE OLIVEIRA WADT, CPAF-AC; A. M. Sebbenn, Instituto Florestal de São Paulo.
Título: | Effects of selective logging on the mating system and pollen dispersal of Hymenaea courbaril L. (Leguminosae) in the Eastern Brazilian Amazon as revealed by microsatellite analysis.
Ano de publicação: | 2011
Fonte/Imprenta: | Forest Ecology and Management, V. 262, p. 1758-1765, 2011.
DOI: | 10.1016/j.foreco.2011.07.023
Idioma: | Inglês
Conteúdo: | Using nine microsatellite loci, we studied the effects of selective logging on genetic diversity, mating system and pollen dispersal in a population of the tree species Hymenaea courbaril, located in a 546 ha plot in the Tapajós National Forest, Pará State, Brazil. We analyzed 250 offspring (nursery reared seedlings) collected after a logging episode from 14 open-pollinated seed trees. These were compared to 367 seedlings from 20 open-pollinated seed trees previously collected from the pre-logging primary forest. The genetic diversity was significantly lower in the post-logging seed cohort. In contrast to the pre-logging population, significant levels of selfing were detected in the post-logging population (tm = 0.962, P < 0.05). However, correlated matings were reduced and the effective number of pollen donors almost doubled after harvesting (3.8 against 7.2). Logging also reduced pollen immigration into the plot (from 55% to 38%) and we found no significant correlation between the size of the pollen donors and the number of seeds fathered. Inside the plot, pollen dispersal distance was shorter before logging than after (827 and 952 m, respectively) and the reproductive pollination neighbor area (Aep) was larger (average of 178 ha). The individual and average variance effective population size within families (ranged from 1.80 to 3.21, average of 2.47) was lower than expected in panmictic populations (Ne = 4). The results indicate that while logging greatly reduced the levels of genetic diversity after logging, it also increased genetic recombination within the population and constrained crossing among related individuals. The results show that low-density tropical tree species such as H. courbaril, when harvested in moderate levels may be resilient to a reduction in the reproductive population and may maintain similar levels of outcrossing and pollen dispersal after logging.
Palavras-Chave: | Amazônia Oriental; Atividade madeireira; Cruce; Eastern Amazon; Floresta Nacional do Tapajós (PA); Flujo de polen; Madera tropical; Manejo florestal seletivo; Marcador microssatélite; Marcadores genéticos; Pará; Pollen dispersal; Reduced impact logging; SSR loci; Tropical; Tropical tree; Variación genética.
Thesagro: | Árvore; Cruzamento; Dispersão; Essência florestal; Hymenaea courbaril; Jatobá; Marcador genético; Pólen; Variação genética.
Thesaurus Nal: | Amazonia; gene flow; Genetic markers; Genetic variation; Pollen flow; Tropical wood.

Categoria do assunto:

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F Plantas e Produtos de Origem Vegetal
K Ciência Florestal e Produtos de Origem Vegetal

Registro original: | Embrapa Florestas (CNPF)

Exemplares:

CPATU - (44524-1) - UPC - AP - DD -  -  -  - DIS
CNPF - (49212-1) - UPC - AP - DD -  -  -  - DIS
CPAF-AC - (25430-1) - UPC - AP - PP - SP 377 -  - 2015.00118 - DES
CPAF-AC - (25430-2) - UPC - AP - DD -  -  -  - DIS