- Natural - Human induced
- Human induced
arising from legislation and traditions
driving forces. The most important natural factor in the Lake Sevan
is the trophic level (primary production). A serious trend occurring
the territory of the Sevan National Park is succession of artificial forests
to the bush. Actually man initially influences both trends.
induced driving forces. Acclimatization of white fish (Coregonus
lavaretus) and silver crussian (Carassius auritus gibelio) and
crayfish (Astacus leptodactylus) in the lake caused an influence
on the natural ecological processes. At present the role of endemic species
in fishery is less than 10%. Illegal fishery threats a fish stocks The artificial
woodland around the shoreline composed from alien to the basin of the lake
A project to re-introduce a native plants requires considerable funds and
activities actually are cancelled. The main sources of pollution are sewage,
agriculture, industry, and recreation. Measures need to be taken to prevent
pollution are expensive and not effective. Local erosion processes as a
result of unauthorized logging and overgrazing are developed especially
near the villages.
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of the Environment Report of Armenia 1998.
Performance Review of Armenia, 2000 (EPRA).
WG4, 1998. National Environmental Action Plan. Water Quality and Water
Resources Management. Volume A: Main Report and Volume B: Appendices.
Prepared by IWACO/JINJ/Norconsult.
Environmental Action Program - Armenia, Main Report, Ministry of Nature
Protection of the Republic of Armenia. The World Bank, 1999.
Sevan Action Program, Main Report, Ministry of Nature Protection of
the Republic of Armenia, The World Bank, 1999.