"In less than 20 years, known populations in Costa Rica declined from 100 to one," says the report.
Overall, however, scientists found that little information is available on most of the 78 known populations.
The collections of Potamophila are from all known populations of the species and are therefore representative both genetically and geographically.
Researchers have already established that elephant populations have characteristic DNA profiles, and they've sampled more than a hundred known populations.
The research extrapolates from a survey of elephant deaths to provide estimates for many less known populations.
Genetically, the Borneo elephants are very different and cannot be matched with any known populations, domestic or wild.
We present a worked example of how geographic and computational tools can aid in discovery and documenting unknown or poorly known populations and distributions of rare plant species.
Based upon historic vegetation maps, extinct butterfly populations were typically isolated from other known populations by 1930, and in landscapes fragmented by cultivation and development.
We present a new model for jaguar (Panthera onca) conservation that uses a geographic information system (GIS) and expert input to create a dispersal cost surface and identify least-cost corridors connecting the 90 known populations across the jaguar's range.
By comparing mutation markers in the DNA, the researchers will be able to test whether the crab comes from known populations, for example near the coast of Chile to the north.
The pharmaceutical company Glaxo Wellcome has donated 54,000 pounds ($88,500) toward the well-being of the medicinal leech, a threatened species in the U.K. The money, which will be split over 3 years, will be used to identify existing leech populations and to protect the 20 known populations.
