DR. BOYLE, TATIANA G. Sustainable Ecosystems Institute, 0605 SW Taylors Ferry Rd. Portland OR 97219. - On the comparative analisys of the Pacific Northwest - Northeast Floras.
The floristic researches of the Pacific Northwest and Northeast are
being continued. The are focused on the determination of
floral-genetic links of the largest terrestrial phyto-formations of
Northern Asia and Northern America on the instance of northeastern -
northwestern Pacific. The comparison of possible ways of the floras
transformation with strengthening of human impact has been undertaken.
Some of the preliminary results are the following. The large
disjunction once formerly connected ranges of common or close related
flora taxa for the Pacific’s North East - North West are appear
obvious with consideration the northern hemisphere flora multi-complex
and are confirmed existing paleobotanical data. Especially that
similarity is shown on instance of tertiary relicts, rare and
endangered plant species and also the taxa which isolation and
origination were furthered by transformations going on in Pleistocene.
Ecological conditions and floristic compositions of the plant
communities in habitat sites of common or close related species in the
considered phyto-formations are not always identical. With
anthropogenic impact the vector of quality composition recombination
of similar local floras depends on series of factors. Among those
current meso-climats and the levels of substrate multi- complex
sustainability play the leading role. The changes of quality
composition of close related floras in both regions caused by
non-natural factors lead to origination of poor plants communities
compositions with weak and unstable genetic potential and lose of
natural floral-genetic links and similarities between studied regions
as well.
Key words: endangered plant species, floral-genetic links, phyto-formation, Pleistocene, rare, tertiary relict