Abstract:

Hot spots analyses afford theoretical basis for us to make strategies and determine different classes of biodiversity conservation for different places.Mainly because of heavy human perturbations, many species and ecosystems in the world are in endangered plight.The loss of biodiversity in tropical rain forests are most serious.Although hot spots occupy very small part of the earth surface, they own a large percentage of the global species pool.Special attention should be paid to biodiversity loss of these regions. The extinction vulnerability of different species is different.Rare species and long lived species are especially vulnerable to extinction.As for keystone species, once endangered, many species which depend on them will likely go to extinction.The loss of genetic diversity is an important aspect of biodiversity loss.The loss of genetic diversity in population are mainly due to founder effect, demog raphic bottleneck, genetic drift and inbreeding.Species conservation should include conservation for genetic diversity in species.Mechnisms of population dy namics and source-sink population dynamics have important implications for biodiversity conservation.Population viability analysis is a new method to understand mechanisms of species endangering.Interrelationships of species in communities and natural disturbance regimes are important aspects to be considered in the conservation of biodiversity.Human caused habitat fragmentation is different from the heterogeneity of natural landscapes.Habitat fragmentation may cause a series of biological effects such as edge effect and crowding effect, etc.

Key words: Biodiversity conservation, Species diversity, Genetic diversity, Habitat fragmentation