ISSN:
1572-9710
Keywords:
Argentina
;
conservation
;
rare
;
sand dunes
;
threatened
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Neosparton darwinii Benth. & Hook. is a ramose, almost leafless shrub, whose growth is restricted to an area on the southwestern coast of Buenos Aires province (Argentina). Its limited distribution could imply risks for its survival. In the present study, we evaluated population characteristics relevant to an assessment of its conservation status and made a preliminary characterization of its habitat. Historical data seem to indicate that the species has undergone a severe reduction in its geographic distribution. We estimated the actual population size to be around 44,000 plants, distributed in a clumped pattern. We found no significant differences between the environments immediately associated with the plants and other similar distant sites, in terms of position on the dune profile, percentage of bare soil and the richness and composition of accompanying plant species. A high proportion of the seeds produced each year is destroyed by parasite bruchid beetles. We have not seen seedlings of N. darwinii in the area. All the laboratory germination essays done to date have produced negative results. The species grows in an area intensively used by tourists. We can foresee quantitative and qualitative reductions in habitat availability. This information points out that N. darwinii is not just a rare species, but its survival is a matter for serious consideration. We suggest certain steps towards effective management to ensure its conservation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008982002763
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