%0 Journal Article
%T Requerimientos germinativos de enredaderas caracter赤sticas del Chaco Serrano de C車rdoba, Argentina Germinating requirements of common vines from Chaco Serrano of C車rdoba, Argentina
%A Anah赤 Bel谷n D＊Agostino
%A Diego Ezequiel Gurvich
%A Mar赤a Cecilia Ferrero
%A Sebasti芍n Rodolfo Zeballos
%J Revista de Biolog赤a Tropical
%D 2012
%I Universidad de Costa Rica
%X Las enredaderas son elementos conspicuos de la flora de diferentes ecosistemas. Numerosos estudios basados en patrones de distribuci車n y ecolog赤a de este grupo de plantas se han realizado a escala regional, se conoce poco sobre los factores que afectan su distribuci車n a nivel local. Se estudiaron los requerimientos germinativos de 21 enredaderas del Bosque chaque o serrano de C車rdoba, las cuales fueron clasificadas en t赤picas de bosques, matorrales e indiferentes. Se llevaron a cabo experimentos de germinaci車n en tres reg赤menes de temperatura (15-5oC, 25-15oC y 35-20oC), en luz (12-12hr luz-oscuridad) y oscuridad permanente. Se registr車 el porcentaje final de germinaci車n, el 赤ndice de germinaci車n relativa a la luz (GRL) y la velocidad de germinaci車n (T50). La temperatura fue el principal factor regulador del proceso germinativo. El GRL y el T50 no registraron diferencias entre fisonom赤as. Los patrones observados apoyan la idea de que la germinaci車n de este grupo de plantas estar赤a respondiendo a factores macroclim芍ticos (estacionalidad del clima y las precipitaciones), m芍s que a un microclima (factores asociados a la fisonom赤a del sitio). La composici車n diferencial de enredaderas en los parches de bosques y arbustos no estar赤a explicada por los factores estudiados, sino por caracter赤sticas de las etapas posteriores a la semilla. Vines are conspicuous elements of floras in different ecosystems. Patterns of distribution and ecology of this group has been studied at regional scales, mainly in tropical areas, but less is known about factors affecting their distribution at smaller scales. In this study, the germinating requirements of common vines from two plant communities (open shrubland and woodland) in xerophytic mountain forests (Chaco serrano) were studied. A total of 21 species were selected and classified as typical of woodland, shrubland, or indifferent. Experimental treatments were three temperature regimes (15-5oC, 25-15oC and 35-20oC), in light (12-12h daily photoperiod) and in continuous darkness. Total germination percentage, the relative light germination (RLG) and germination rate (T50) were recorded. Among results we found that the temperature was the main factor triggering the germination process. No differences in the mean RLG and T50 between woodland and shrubland patches were found. The patterns observed in this work support the idea that, independently of patch type, germination is associated with temperature of the time of the year when most of the rainfall occurs. Germination of the studied species would be responding to macroclimate＊
%K Chaco serrano
%K caracter赤sticas regenerativas
%K enredaderas
%K semillas
%K temperatura
%K luz
%K Chaco forests
%K vines
%K seed germination
%K temperature
%K light
%U http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000400009