2 resultados para FEMALE-BIASED SEX RATIO

em Portal de Revistas Científicas Complutenses - Espanha


Relevância:

100.00% 100.00%

Publicador:

Resumo:

Juniperus navicularis Gand. is a dioecious endemic conifer that constitutes the understory of seaside pine forests in Portugal, areas currently threatened by increasing urban expansion. The aim of this study is to assess the conservation status of previously known populations of this species located on its core area of distribution. The study was performed in south-west coast of Portugal. Three populations varying in size and pine density were analyzed. Number of individuals, population density, spatial distribution and individual characteristics of junipers were estimated. Female cone, seed characteristics and seed viability were also evaluated. Results suggest that J. navicularis populations are vulnerable because seminal recruitment is scarce, what may lead to a reduction of genetic variability due solely to vegetative propagation. This vulnerability seems to be strongly determined by climatic constraints toward increasing aridity. Ratio between male and female shrubs did not differ from 1:1 in any population. Deviations from 1:1 between mature and non-mature plants were found in all populations, denoting population ageing. Very low seed viability was observed. A major part of described Juniperus navicularis populations have disappeared through direct habitat loss to urban development, loss of fitness in drier and warmer locations and low seed viability. This study is the first to address J. navicularis conservation, and represents a valuable first step toward this species preservation. 

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Through an ethnographic account, this text analyses how social dance may become a discourse involving the cultural affirmation of a subordinate group. It describes how a group of girls faced with a complex of outlooks that construed them as Moroccan, Muslim or unattractive —or as objects of education and intervention— responded by affirming their own culture with an unanticipated corporal discourse. The way in which looking construes bodies is explored through metaphors: a hand that touches, a chisel that sculpts, a whip that lashes and a cobweb that controls and traps bodies. Owing to this political dimension of dance, workshops can also be an oppressive and silencing tool; to prevent this, the article concludes with a series of recommendations to implement dance in social intervention processes.