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Abstract:

A large fraction of tree species forming persistent soil seed-banks and with dormant seeds are expected to be found in strongly seasonal ecosystems such as Neotropical savannas, where seedling recruitment could be highly variable. In the savannas of Central Brazil, we studied seed characteristics (type of dormancy, longevity and moisture content) of 14 representative woody species differing in seed dispersal season. We also studied the dynamics of soil seed-banks and similarity patterns in woody species composition among seed rain, soil seed-bank, seedling bank and standing vegetation along shallow topographic gradients that differ in canopy cover. Woody species composition of the soil seed-bank largely differed from the standing vegetation, the seed rain and the seedling bank species composition, suggesting low recruitment of woody species from the soil seed-bank. Seeds of the 14 woody species remained viable for less than 16 months in laboratory dry-storage conditions. Of those, most seeds dispersed in the dry season were dormant and exhibited low moisture content, while most seeds dispersed in the wet season were non-dormant and exhibited high moisture content. Longevity of these seeds dispersed in the dry and the wet seasons did not differ significantly. This study shows that both timing of seed dispersal and dormancy appear to control timing of seed germination and seedling recruitment of most Neotropical savanna woody species, which did not form persistent soil seed-banks. This study contributes to the understanding of tree/grass coexistence and tree density variations along topographic gradients in tropical savannas. © 2011 Cambridge University Press.

Registro:

Documento: Artículo
Título:Timing of seed dispersal and dormancy, rather than persistent soil seed-banks, control seedling recruitment of woody plants in Neotropical savannas
Autor:Salazar, A.; Goldstein, G.; Franco, A.C.; Miralles-Wilhelm, F.
Filiación:Department of Biology, University of Miami, Coral Gables, FL 33124-0421, United States
Laboratorio de Ecologa Funcional and CONICET, Departamento de Ecologa, Genética y Evolucin, Ciudad Universitaria, Nez, Buenos Aires, Argentina
Departamento de Botanica, Universidade de Brasilia, Caixa Postal 04457, Brasilia, DF 70919-970, Brazil
Department of Civil and Environmental Engineering, Florida International University, 10555 W. Flagler Street, EC 3680, Miami, FL 33174, United States
Palabras clave:life history stage; seed dormancy types; seed ecology; seed longevity; seedling bank; tree density gradients; tropical savannas
Año:2011
Volumen:21
Número:2
Página de inicio:103
Página de fin:116
DOI: http://dx.doi.org/10.1017/S0960258510000413
Título revista:Seed Science Research
Título revista abreviado:Seed Sci. Res.
ISSN:09602585
CODEN:SESRE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09602585_v21_n2_p103_Salazar

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Citas:

---------- APA ----------
Salazar, A., Goldstein, G., Franco, A.C. & Miralles-Wilhelm, F. (2011) . Timing of seed dispersal and dormancy, rather than persistent soil seed-banks, control seedling recruitment of woody plants in Neotropical savannas. Seed Science Research, 21(2), 103-116.
http://dx.doi.org/10.1017/S0960258510000413
---------- CHICAGO ----------
Salazar, A., Goldstein, G., Franco, A.C., Miralles-Wilhelm, F. "Timing of seed dispersal and dormancy, rather than persistent soil seed-banks, control seedling recruitment of woody plants in Neotropical savannas" . Seed Science Research 21, no. 2 (2011) : 103-116.
http://dx.doi.org/10.1017/S0960258510000413
---------- MLA ----------
Salazar, A., Goldstein, G., Franco, A.C., Miralles-Wilhelm, F. "Timing of seed dispersal and dormancy, rather than persistent soil seed-banks, control seedling recruitment of woody plants in Neotropical savannas" . Seed Science Research, vol. 21, no. 2, 2011, pp. 103-116.
http://dx.doi.org/10.1017/S0960258510000413
---------- VANCOUVER ----------
Salazar, A., Goldstein, G., Franco, A.C., Miralles-Wilhelm, F. Timing of seed dispersal and dormancy, rather than persistent soil seed-banks, control seedling recruitment of woody plants in Neotropical savannas. Seed Sci. Res. 2011;21(2):103-116.
http://dx.doi.org/10.1017/S0960258510000413