Biodiversity and Its Conservation
Biodiversity and Its Conservation
Biodiversity and Its Conservation
Definition:
Bio-Diversity or Biological Diversity is the variation of taxonomic life forms within a given ecosystem, biome or for the entire earth.
Bio-Diversity refers to variety and variability among all groups of living organism and the ecosystem complexes in which they occur.
In the convention of biological diversity 1992- Biodiversity has been defined as the variability among living organism from all sources including inter alia, terrestrial, marine and other aquatic ecosystem and the ecological complexes of which they are a part.
Biodiversity is often a measure of health of biological system to indicate the degree to which the aggregate of historical species are
Levels of biodiversity
Bio diversity ranges from the genetic level with in a species to the biota in a specific Region and may extend to the great diversity found in different biomes. GENETIC DIVERSITY- diversity of genes within a species. There is a genetic variability among the population and the individual of the same species. SPECIES DIVERSITY- diversity among species in the ecosystem. Biodiversity hot spots are the excellent examples of species diversity. ECOSYSTEM DIVERSITY-diversity at higher level of organisation.
TRANS HIMALAYAN
HIMALAYAN
UPPER REGION
NORTH-WEST HIMALAYAN WEST HIMALAYAN CENTRAL HIMALAYAN EAST HIMALAYAN KUTCH THAR CENTRAL INDIA GUJARAT-RAJWARA MALABAR COASTS WESTERN GHAT MOUNTAIN ANDMAN NICOBAR LAKSHADWEEP
186200
6900 720000 123000 83000 45000 180000 107600 400400 59700 99300 6397 1930 180
Biogeographic zone
DESERT SEMI ARID WESTERN GHATS ISLANDS
DECCAN PENINSULA
DECCAN PLATEAU SOUTH CENTRAL PLATEAU EASTERN PLATEAU CHHOTA NAGPUR CENTRAL HIGHLANDS BRAHMAPUTRA VALLEY NORTH EASTERN HILLS WEST COASTS EAST COASTS
A large no. of species are known to have originated in INDIA 7500 km long Indian coastline is rich in Mangroves, Estuaries, Coral reefs etc.. More than 340 species of Corals of the world are found here Several species of Mangroves and Sea grasses are found in INDIA.
GLOBAL BIODIVERSITY
roughly 1.8 million species are known till date. Most of the worlds bio rich nations are in the south developing nations. The majority of the countries capable of exploiting bio-diversity are northern regions-developed nations.
International agreements- World Heritage Convention attempt to protect and support Such area . India is a signatory to the convention and has included areas covering Manas on the border between Bhutan and India , Kaziranga in Assam , Bharatpur in UP, Nandadevi in the Himalayas and the Sunderbans in the Ganges delta in West Bengal.
INDIAN BIODIVERSITY
Every country is characterised by its own biodiversity Depending upon its climate. India has rich biological diversity of flora and fauna. 6% Global species are found in India. The total no of species found in India is 150,000 Out of a total of 25 biodiversity hotspots in the world India posses 2, one in the northern regions and one in the Western Ghats.
The ministry of environment and forest,govt. of India records 47000 species Of plants and 81000 species of animals. i.e. 7% &6.5% of global flora & fauna.
1. AUSTRALIA 2. BRAZIL 3. CHINA 4. COLUMBIA 5. ECUADOR 6. THE UNITED STATES 7. INDIA 8. INDONESIA 9. MEDAGASKAR 10. MEXICO 11. PERU 12. THE DEMOCRATIC REPUBLIC OF CONGO
DISTRIBUTION OF SPECIES ( flora and fauna ) IN INDIA PLANTS Bacteria Fungi 850 23000 NUMBER ANIMALS Lower groups Mollusca 9979 5042 NUMBER
Algae
Bryophytes Petridophytes Gymnosperms Angiosperms
2500
2564 1022 64 15000
Arthropod
Pisces Amphibians Reptiles Birds Mammals
57525
2564 428 1228 204 372
Areas which exhibit high species richness as well as high species endemism are termed as HOT SPOTS OF BIODIVERSITY There are 25 Hot Spots at global level. An area is designed as a Hot Spot when it contains at least 0.5%of the plant species as endemics. The Hot Spots cover less than 2% of the worlds land but are found to have 50% of the terrestrial biodiversity. The Indian Hot Spots are not only rich in floral wealth and endemic species of plants but also reptiles, amphibians, swallow tailed butterflies and some mammals.
(2) MESOAMERICAN FOREST (10) WESTERN AFRICA FORESTS (3) CARIBBEAN (4) BRAZILS ATLANTIC FOREST (5) DARIAN OF PANAMA WESTERN ECUADOR (6) CENTRAL CHILE (7) CALIFORNIA FLORISTIC PROVINCE (8) MEDAGASKAR (11) CAPE FLORISTIC PROVINCE (12) SUCCULENT KAROO
(18) INDO BURMA EASTEARN HIMALAYA (19) SOUTH CENTRAL CHINA (20) WESTERN GHATS
(13) MEDITERRANEAN BASIN (21) SOUTH WESTERN AUSTRALIA (14) CAUCASUS (15) SUNDAL LAND (16) WALLACEA (22) NEW CALEDONIA (23) NEW ZEALAND (24) POLYNESIA/
THREATS TO BIODIVERSITY Extinction or elimination of a species is a natural process of evolution. However the rate of loss of species in part has been a slow process. The process of extinction has become particularly fast in the recent year of human civilisation. One of the estimates by E.D.Wilson puts the figure of extinction at 10,000 species per year.
Loss of habitat- destruction and loss of natural habitat is the single cause of biodiversity loss. Billions of hectares of forests and grasslands have cleared over the past 10000 years. Sometime the loss of habitat is in instalments so that the habitat is divided into small and scattered patches-habitat fragmentation. Poaching- illegal trade of wildlife products. Man wild life conflicts.
Red data Book published by IUCN includes the list of Endangered species of plants and animals . In India , nearly 450 plant species have been identified in the categories of endangered. Existence of 150 mammals and 150 species of birds is estimated to be threatened while an unknown number of species of insects
are endangered.
(b)Birds- Great Indian Bustard, Pelicon Peacock Great Indian Horhbill, Siberian White Crane. (c) Carnivorous- Indian Wolf, Red fox, Sloth Bear,Red PandaTiger, Leopard, Striped Hyena, Indian Lion, Golden Cat, Dugong.
(d) Primates- Hoolock Gibbon, lion, Tailed Macaque, Nilgiri langur, Capped Monkey, Golden Monkey.
(e) Plants- no. of species of Orchids, Rhododendrons, medicinal plants like Rauvolfia Serpentina, the Sandal Wood tree, Santalom Cycus Bedoni etc. Cheetah,Pink headed Duck and Mountain Quail have already become extinct from
Conservation of Biodiversity
The enormous value of Biodiversity due to their genetic, commercial, medical, aesthetic, ecological, and optional Importance emphasizes the need to conserve biodiversity.
Situ Conservation At present there are 7 major Biosphere reserves, 80 National parks , 420 Wild Life Sanctuaries and 120botanical gardens in India covering 4% of geographic area. The Biosphere reserves conserve some representative Ecosystems as a whole for long term in Situ conservation. In India we have Nanda devi, Nokrek Manas Sunderban, Gulf of Mannar , Nilgiri, Great Nicobars and Similiple Biosphere reserves.
A National Park is a area dedicated for the conservation of wild-life along with its environment. It is also meant for enjoyment Through tourism but without imparing the environment.
Each National Park usually aims at conservation specifically of some particular species of wild- life along with others.
Wild life Sanctuaries are also protected areas where killing, haunting, Shooting or capturing of wild- life is prohibited except under the control of highest authority. Private Ownership rights are permissible and forestry operations are also permitted to an extent that do not affect the wild- life adversely.
EX SITU CONSERVATION
This type of conservation is mainly done for conservation of crop varieties, the wild relatives of crops and all the local varieties with the main objective of conserving the total genetic variability of crop species for future crop improvement programs. In India there are 3 important gene bank/seed bank facilities:
1. NBPGR 2. NBAGR 3. NFPTCR