on 6/18/05 10:24 AM, Viateur wrote: > Feel free to comment. > > I suspect that some subscribers to this list might not agree with the > 'disturbance and suitable grazing' theory. > > Regards, > > Viateur
Hello Viateur, There are some terrestrial species that thrive in disturbed areas and are probably in greater numbers following the expansion of people across the globe, and there are others that the slightest compaction of the forest floor is enough to kill them. I recently saw where colonies of showy orchis in NY that were thriving on the sides of gullies where runoff had chiseled very narrow rivulets, that seemingly allow their seed to find soil and germinate. Granted it is natural disturbance. Spiranthes cernua complex and spiranthes casei are both ones that follow disturbances along highways and calypso bulbosa highly resents any disturbance at all. I've read on two of the north american native orchid email lists on yahoo that there are several that were thought to like undisturbed areas but that multi-year records especially in Canada by orchid clubs has seemingly shown that there are a fair amount of orchids that are in greater numbers in areas that have become disturbed. charles -- Charles Ufford Oriskany, NY USA IPA, Central NY and Southern Tier Orchid Societies Http://www.paphiopedilum.net Http://www.geocities.com/charlesufford _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
