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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
28/10/2016 |
Data da última atualização: |
23/05/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ARRUDA, C. C. B.; SILVA, M. B.; GRIBEL, R.; LEMES, M. R.; KANASHIRO, M.; SEBBENN, A. M. |
Afiliação: |
C. C. B. ARRUDA, UFPA; M. B. SILVA, UFPA; R. GRIBEL, INPA / JARDIM BOTÂNICO DO RIO DE JANEIRO; M. R. LEMES, INPA / JARDIM BOTÂNICO DO RIO DE JANEIRO; MILTON KANASHIRO, CPATU; A. M. SEBBENN, INSTITUTO FLORESTAL. |
Título: |
Logging decreases the pollen dispersal distance in a low-density population of the tree Bagassa guianensis in the Brazilian Amazon. |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
Silvae Genetica, v. 64, n. 5/6, p. 279-290, 2015. |
Idioma: |
Inglês |
Conteúdo: |
This study investigates the distance and patterns of pollen dispersal before and after logging in a low-density population of the dioecious, insect pollinated tree species, Bagassa guianensis, in the Brazilian Amazon. All adult trees found before and after logging in a 500 ha plot were mapped and genotyped for six microsatellite loci. Seeds collected before and after logging were also sampled and genotyped. We used a categorical paternity analysis to determine seed paternity. Our results showed similar levels of pollen flow before (23%) and after logging (26%), but an increase in the mean effective pollination neighbourhood area, and a decrease in the rate of mating among relatives after logging, resulting in open pollinated seeds with lower levels of inbreeding (0.126) than before logging (0.222). We also detected changes in the mating pattern between before and after logging, a decrease in the median pollen dispersal distance and effective number of pollen donors after logging. Our results support the idea that reproductive trees should be maintained in the plot and around logged areas, using lowest levels of logging intensity to maintain pollen flow and decrease the relatedness of subsequent generations. |
Thesagro: |
Floresta Tropical; Pólen; Polinização; Tatajuba. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
Marc: |
LEADER 01914naa a2200229 a 4500 001 2055628 005 2022-05-23 008 2015 bl uuuu u00u1 u #d 100 1 $aARRUDA, C. C. B. 245 $aLogging decreases the pollen dispersal distance in a low-density population of the tree Bagassa guianensis in the Brazilian Amazon.$h[electronic resource] 260 $c2015 520 $aThis study investigates the distance and patterns of pollen dispersal before and after logging in a low-density population of the dioecious, insect pollinated tree species, Bagassa guianensis, in the Brazilian Amazon. All adult trees found before and after logging in a 500 ha plot were mapped and genotyped for six microsatellite loci. Seeds collected before and after logging were also sampled and genotyped. We used a categorical paternity analysis to determine seed paternity. Our results showed similar levels of pollen flow before (23%) and after logging (26%), but an increase in the mean effective pollination neighbourhood area, and a decrease in the rate of mating among relatives after logging, resulting in open pollinated seeds with lower levels of inbreeding (0.126) than before logging (0.222). We also detected changes in the mating pattern between before and after logging, a decrease in the median pollen dispersal distance and effective number of pollen donors after logging. Our results support the idea that reproductive trees should be maintained in the plot and around logged areas, using lowest levels of logging intensity to maintain pollen flow and decrease the relatedness of subsequent generations. 650 $aFloresta Tropical 650 $aPólen 650 $aPolinização 650 $aTatajuba 700 1 $aSILVA, M. B. 700 1 $aGRIBEL, R. 700 1 $aLEMES, M. R. 700 1 $aKANASHIRO, M. 700 1 $aSEBBENN, A. M. 773 $tSilvae Genetica$gv. 64, n. 5/6, p. 279-290, 2015.
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Embrapa Amazônia Oriental (CPATU) |
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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. |
Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
25/06/2013 |
Data da última atualização: |
07/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
PAULA, F. R. de; GERHARD, P.; WENGER, S. J.; FERREIRA, A.; VETTORAZZI, C. A.; FERRAZ, S. F. de B. |
Afiliação: |
FELIPE ROSSETTI DE PAULA, ESALQ; PEDRO GERHARD, CPATU; SETH J. WENGER, TROUT UNLIMITED; ANDERSON FERREIRA, CENA/USP; CPATU; CARLOS ALBERTO VETTORAZZI, ESALQ; SILVIO FROSINI DE BARROS FERRAZ, ESALQ. |
Título: |
Influence of forest cover on in-stream large wood in an agricultural landscape of southeastern Brazil: a multi-scale analysis. |
Ano de publicação: |
2013 |
Fonte/Imprenta: |
Landscape Ecology, v. 28, n. 1, p. 13-27, Jan. 2013. |
DOI: |
10.1007/s10980-012-9809-1 |
Idioma: |
Inglês |
Conteúdo: |
Large wood (LW) is critical to the structure and function of streams and forests are the main LW source to stream channels. To assess the influence of forest cover changes at different spatial scales on in-stream LW quantity, we selected eighteen catchments (2nd?4th order) in Southeastern Brazil with forests at different levels of alterations. In each catchment we quantified the pattern of forest cover (% cover and relative catchment position), the physical characteristics of catchments (elevation and slope), the characteristics of channels (wetted channel width and depth), the abundance and volume of in-stream LW, and the frequency of LW pools. We used simple and multiple linear regression to assess the response of LW variables to landscape and stream reach variables. Most of the LW was relatively small; 72 % had a diameter <20 cm, and 66 % had a length <5 m. Although percent forest cover at reach scale had substantial support to explain LW variables, the best predictors of LW variables were forest cover at broader scales (LW abundance and LW pool frequency were best predicted by forest at intermediate distance at the catchment scale and LW volume was best predicted by forest cover at the drainage network scale), suggesting that downstream transport is an important process in addition to local processes in our study area. These findings have important management implications because although low forested reaches receive less LW from local forests (or no LW in the case of deforested stream reaches), they are receiving LW from upstream forested reaches. However, the material is generally small, unstable and likely to be easily flushed. This suggests that not only should riparian forest conservation encompass the full drainage network, but forests should also be allowed to regenerate to later successional stages to provide larger, higher quality LW for natural structuring of streams. MenosLarge wood (LW) is critical to the structure and function of streams and forests are the main LW source to stream channels. To assess the influence of forest cover changes at different spatial scales on in-stream LW quantity, we selected eighteen catchments (2nd?4th order) in Southeastern Brazil with forests at different levels of alterations. In each catchment we quantified the pattern of forest cover (% cover and relative catchment position), the physical characteristics of catchments (elevation and slope), the characteristics of channels (wetted channel width and depth), the abundance and volume of in-stream LW, and the frequency of LW pools. We used simple and multiple linear regression to assess the response of LW variables to landscape and stream reach variables. Most of the LW was relatively small; 72 % had a diameter <20 cm, and 66 % had a length <5 m. Although percent forest cover at reach scale had substantial support to explain LW variables, the best predictors of LW variables were forest cover at broader scales (LW abundance and LW pool frequency were best predicted by forest at intermediate distance at the catchment scale and LW volume was best predicted by forest cover at the drainage network scale), suggesting that downstream transport is an important process in addition to local processes in our study area. These findings have important management implications because although low forested reaches receive less LW from local forests (or no LW in the case of de... Mostrar Tudo |
Palavras-Chave: |
Brasil. |
Thesagro: |
Ecologia; Floresta. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
Marc: |
LEADER 02622naa a2200229 a 4500 001 1960506 005 2022-11-07 008 2013 bl uuuu u00u1 u #d 024 7 $a10.1007/s10980-012-9809-1$2DOI 100 1 $aPAULA, F. R. de 245 $aInfluence of forest cover on in-stream large wood in an agricultural landscape of southeastern Brazil$ba multi-scale analysis.$h[electronic resource] 260 $c2013 520 $aLarge wood (LW) is critical to the structure and function of streams and forests are the main LW source to stream channels. To assess the influence of forest cover changes at different spatial scales on in-stream LW quantity, we selected eighteen catchments (2nd?4th order) in Southeastern Brazil with forests at different levels of alterations. In each catchment we quantified the pattern of forest cover (% cover and relative catchment position), the physical characteristics of catchments (elevation and slope), the characteristics of channels (wetted channel width and depth), the abundance and volume of in-stream LW, and the frequency of LW pools. We used simple and multiple linear regression to assess the response of LW variables to landscape and stream reach variables. Most of the LW was relatively small; 72 % had a diameter <20 cm, and 66 % had a length <5 m. Although percent forest cover at reach scale had substantial support to explain LW variables, the best predictors of LW variables were forest cover at broader scales (LW abundance and LW pool frequency were best predicted by forest at intermediate distance at the catchment scale and LW volume was best predicted by forest cover at the drainage network scale), suggesting that downstream transport is an important process in addition to local processes in our study area. These findings have important management implications because although low forested reaches receive less LW from local forests (or no LW in the case of deforested stream reaches), they are receiving LW from upstream forested reaches. However, the material is generally small, unstable and likely to be easily flushed. This suggests that not only should riparian forest conservation encompass the full drainage network, but forests should also be allowed to regenerate to later successional stages to provide larger, higher quality LW for natural structuring of streams. 650 $aEcologia 650 $aFloresta 653 $aBrasil 700 1 $aGERHARD, P. 700 1 $aWENGER, S. J. 700 1 $aFERREIRA, A. 700 1 $aVETTORAZZI, C. A. 700 1 $aFERRAZ, S. F. de B. 773 $tLandscape Ecology$gv. 28, n. 1, p. 13-27, Jan. 2013.
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