Population structure and gene flow of the Brazilian shrub Helicteres brevispira

Article Abstract:

Seed dormancy, short seed dispersal distances, and seed bank founder effects may be the main determinants of genetic structure in populations of Helicteres brevispira. Population structure and gene flow of the Brazilian shrub, a pioneer tropical riparian species, have been studied. Populations of the shrub seem to go through cycles of extinction and recolonization. Genetic consequences of founding events may greatly affect genetic population structure. The data do not fit with the equilibrium model of isolation by distance. The neighborhood area is estimated to have a 15 m diameter.

United Kingdom, Brazil, Environmental aspects, Hummingbirds, Seeds, Heredity, Population genetics, Seed dispersal, Shrubs, Pollination

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Host-associated populations in the lettuce root aphid, Pemphigus bursarius (L.)

Article Abstract:

The relationships between aphids on Populus were investigated, following sexual reproduction, and those on the secondary hosts. Evidence was found for a distinct, cyclically parthenogenetic population that exploited Lactuca sativa as its secondary host.

Science & research, Mitochondrial DNA, Parthenogenesis, Aphididae, Aphids, Host plants

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