INVESTIGADORES
PREMOLI IL'GRANDE Andrea Cecilia
congresos y reuniones científicas
Título:
Conservation of genetic resources in South American temperate forests: the Proteaceae Embothrium coccineum as keystone species
Autor/es:
SOUTO, C. & A.C. PREMOLI
Lugar:
Brasilia, Brasil
Reunión:
Congreso; 19th Annual Meeting of the Society for Conservation Biology; 2005
Institución organizadora:
Society for Conservation Biology
Resumen:
One goal of biodiversity conservation is to preserve variation patterns
at intraspecific level. Widespread species showed complex
genotypic and phenotypic structure in response to environmental
variables. Embothrium coccineum inhabits radically different
environments. We predict that morphological and genetic
traits variation patterns are associated along its wide geographic
range (18 degrees of Latitude). We genetically characterized using
isozymes, and morphologically through leaf size and shape each
of 34 populations along species range. Nine isozyme markers that
coded for 19 putative loci showed that E. coccineum populations
are highly polymorphic (P 92%), and heterogeneous among each
other regarding their allelic frequencies, showing high levels of inbreeding
and restricted interpopulation gene flow (Nm < 1). The
NA is higher in austral populations, but% P is higher in northern
ones, probably as consequence of species biogeographyc history.
E. coccineum is highly variable also morphologically, possibly in
response to favourable conditions of temperature and humidity.
Multivariate discriminant analysis combining genetic and morphological
variables grouped populations according to its geographic
location. This study highlights the importance of preserving genotypic
and phenotypic variation in habitats occupied by a keystone
species belonging to a monotypic genus that inhabits all National
Parks, and unprotected areas in Patagonia.