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Abstract:

Little is known about the effects of fire on the structure and species composition of Neotropical savanna seedling communities. Such effects are critical for predicting long-term changes in plant distribution patterns in these ecosystems. We quantified richness and density of seedlings within 144 plots of 1 m2 located along a topographic gradient in long-unburned (fire protected since 1983) and recently burned (September 2005) savannas in Brazil. These savannas differ in tree density and canopy cover. Sites along the gradient, however, did not differ in species composition prior to the fire. In recently burned savannas we also evaluated the contribution of vegetative reproduction relative to sexual reproduction by quantifying richness and density of root suckers. Finally, we tested seed tolerance to pulses of high temperatures-similar to those occurring during fires on the soil surface and below-of five dominant savanna tree species. Seedlings were more abundant and diverse in unburned than in burned savannas. Seedling species composition differed among unburned and burned savannas probably reflecting early differences in root: shoot biomass allocation patterns. In recently burned savannas, root suckers were more abundant and diverse than seedlings. Relatively long exposures (>10 min) of temperatures of 90 °C reduced seed germination in all studied species suggesting a negative effect of fire on germination of seeds located at or aboveground level. Because vegetative reproduction contributes more than sexual reproduction in burned environments, frequent fires are likely to cause major shifts in species composition of Neotropical savanna plant communities, favoring clonally produced recruits along tree density/topographic gradients. © 2014 The Association for Tropical Biology and Conservation.

Registro:

Documento: Artículo
Título:Effects of fire on seedling diversity and plant reproduction (Sexual vs. Vegetative) in neotropical savannas differing in tree density
Autor:Salazar, A.; Goldstein, G.
Filiación:Department of Biology University of Miami 1301 Memorial Drive Coral Gables, Florida 33124 U.S.A
Departamento de Ecología Genética y Evolución Laboratorio de Ecología Funcional Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Ciudad Universitaria Núñez Buenos Aires Argentina
Idioma: Inglés
Palabras clave:Brazil; Cerrado; Disturbance; Heat shocks; Root suckers
Año:2014
DOI: http://dx.doi.org/10.1111/btp.12090
Título revista:Biotropica
Título revista abreviado:Biotropica
ISSN:00063606
CODEN:BTROA
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_00063606_v_n_p_Salazar

Citas:

---------- APA ----------
Salazar, A. & Goldstein, G. (2014) . Effects of fire on seedling diversity and plant reproduction (Sexual vs. Vegetative) in neotropical savannas differing in tree density. Biotropica.
http://dx.doi.org/10.1111/btp.12090
---------- CHICAGO ----------
Salazar, A., Goldstein, G. "Effects of fire on seedling diversity and plant reproduction (Sexual vs. Vegetative) in neotropical savannas differing in tree density" . Biotropica (2014).
http://dx.doi.org/10.1111/btp.12090
---------- MLA ----------
Salazar, A., Goldstein, G. "Effects of fire on seedling diversity and plant reproduction (Sexual vs. Vegetative) in neotropical savannas differing in tree density" . Biotropica, 2014.
http://dx.doi.org/10.1111/btp.12090
---------- VANCOUVER ----------
Salazar, A., Goldstein, G. Effects of fire on seedling diversity and plant reproduction (Sexual vs. Vegetative) in neotropical savannas differing in tree density. Biotropica. 2014.
http://dx.doi.org/10.1111/btp.12090