Very educative and interesting piece of information, thankyou for sharing Prasad ji.
regards, Rashida. On Wed, Jan 19, 2011 at 6:46 PM, tanay bose <[email protected]> wrote: > Thanks for sharing this important piece of information > tanay > > > On Wed, Jan 19, 2011 at 1:02 AM, prasad dash <[email protected]>wrote: > >> Dear all keeping in view of the ongoing climatic variation, it is very >> demanding to study the lichen distribution as they are the key bioindicators >> in an ecosystem. The lichens are very less tolerant to pollution load and >> immediately they respond to any kind of stress by their presence and >> absence. The crustose lichens tolerate the maximum pollution load where as >> both foliose and fructicose lichens do the least. As Lichen diversity is >> maximum in Sal tree (Shorea robusta) which harbours almoast 64 species >> followed by Mango (Mangifera indica) and Sindur (Mallotus philipensis) and >> these are very common tree in almost all part of India, one can easily >> observe the type of epiphytic lichens growing there to study the dynamics of >> pollution load in their respective local ambience by the presence/absence >> and appearance/vanishing of lichens without any chemical analysis. >> Elimination of large number of lichen species in an area is an indicator of >> growing environmental pollution, as lichen cannot tolerate the acidic gases. >> Thus in areas with high acidic gases, a few resistant species will occur. >> The pollution-tolerant species exhibit aggressive behaviour spreading >> rapidly, covering a variety of substrates. I have collected 45 species of >> lichens from different parts of Orissa as epiphytes on Sal tree which are >> varrying in their diversity and distribution. Thus the number and >> distribution of lichen species on Shorea robusta can be utilized as >> indicator species for carrying out rapid future biomonitoring studies in the >> area. >> Regards >> >> Prasad >> -- >> Prasad Kumar Dash >> Ecologist, Orissa, India >> email: [email protected] >> ph. 09437444241 >> > > > > -- > *Tanay Bose* > Research Assistant & Teaching Assistant. > Department of Botany. > University of British Columbia . > 3529-6270 University Blvd. > Vancouver, B.C. V6T 1Z4 (Canada) > Phone: 778-323-4036 (Mobile) > 604-822-2019 (Lab) > 604-822-6089 (Fax) > [email protected] > *Webpages:* > http://www.botany.ubc.ca/people/mberbee.html > http://www.botany.ubc.ca/people/gradstud.html > https://sites.google.com/site/efloraofindia/ > > >
