Human Impacts on Genetic Diversity
© Photo courtesy of C. Navarro.
The influence of several human impacts on the distribution and dynamics of genetic
diversity within species will be investigated.
Data previously obtained on the distribution and dynamics of diversity will be reanalysed
in the light of these factors.
Domestication
Evaluation of the effects of selection through introduction or domestication of species
In Brazil, Anacardium occidentalis has been heavily cultivated. The effect of
domestication on the genetic diversity of the species will be evaluated by comparing wild
and cultivated individuals.
Forest fragmentation
The effects of forest fragmentation on Cedrela odorata and Hyeronima
alchorneoides in Central America and Eugenia uniflora in Brazil, will be
examined. Studies will focus on comparison of different sizes of fragments and different
neighbour distances and time since fragmentation occurred.
Logging
In Guyane, Qualea rosea and Symphonia globulifera occur together on
plots which have been logged in a controlled manner at different intensities. Qualea is
economically important, and therefore extracted during logging, while Symphonia has
no commercial value and is not exploited. Comparison of the mating systems of these
species on the different plots will enable the direct and indirect effects of logging to
be examined.
For Cedrela odorata in Costa Rica, logged and unlogged plots in close proximity
will be compared.
