Changing Aspects of Endemism and Endangerment in Pteridophyta

Abstract

In conserving biodiversity, increasing attention is being given to patterns and centres of endemism, rarity and endangerment at various levels including biome, species and gene. Primary and secondary centres of pteridophyte diversity are discussed in relation to mesic and xeric taxa. There is need for more ecological data, especially relating to the gametophyte and the effects on it of stress and competition. Humans are a significant factor in contemporary pteridophyte biogeography, especially through inducing habitat fragmentation. The response of pteridophytes to fragmentation is probably mixed: although most are capable of long distance dispersal which facilitates recolonization of fragments, many have a high level of habitat fidelity which demands retention of core areas. Priorities for action are suggested.