Population demography and reproduction of rare, endemic and/or threatened species.

The reproductive patterns are one of the key factors leading to the actual abundance, distribution and genetic diversity of organisms. In flowering plants a highly diverse array of floral traits and reproductive systems evolved varying from obligated cross-fertilization to obligated or promoted self-fertilization, with each strategy presenting selective vantages and disadvantages. In rare, endemic and/or narrow species, these patterns assume special importance as they will operate in a reduced number of individuals/populations, primarily determining their reproductive success and secondarily affecting their population dynamics and genetic diversity.

In this line of work we are aimed to describe the flower biology and breeding system of endemic, rare and/or threatened species to evaluate how they affect the reproductive outcome in natural populations.

A flower polimorphysm linked to a dialelic incompatibility system has been described for the genus Armeria. Thus, two floral morphs are present in the populations, one with lobed stigma and reticulated pollen grains, and the other with papillated stigma and thorny pollen grains. The pollen of one morph can only fertilize the stigmas of the other (complementary) morph. In this study we try to verify the presence of the incompatibility system in the endemic species of the genus in Galicia (Spain), as well as the demographic dynamics of the populations. Such knowledge is needed for the management of these endangered species.

Design downloaded from Free Templates - your source for free web templates