Insitu and exsitu conservation.biodiversity conservation methods mainly 2 types insitu and exsitu...
Transcript of Insitu and exsitu conservation.biodiversity conservation methods mainly 2 types insitu and exsitu...
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BIODIVERSITY CONSERVATIONS
CONSERVATION
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INTRODUCTION
In strategies of biodiversity conservation mainly two basic strategies have been proposed to ensure the future survival of endangered species.
in situ conservation : it mean that the conservation of plants and animals in their natural environments
ex situ conservation: conservation of animals and plants out side their natural habitats
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In situ conservation( onsite conservation )
Site of conservation of plants and animals in their natural environments
So ,it involves the conservation of total ecosystems in protected areas.
Protected areas --- national game parks , wild life sanctuaries , Biosphere reserves , Ramsar sites & world heritage centers.
37,000 protected areas around the world
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In India
Ramsar sites ----- 19 World heritage centers ----- 5 National game parks ----- 94 Wild life sanctuaries ------ 502 Biosphere reserve ------- 18
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Ramsar sites
Oldest of the global environmental conventions The only global convention focusing attention on an
wetlands Ramsar , Iran – where 18 countries signed the
convention on 2 February 1971 World wetland day---- February 2 Eg : Ashtamudi kayal Vebbanattu kayal
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So….Ramsar covers Natural and human-made wetlands inland/freshwater:
marshes, rivers, lakes, reservoirs etc. coastal/marine
lagoons, estuaries, mangroves, coral reefs, seagrass beds etc. above ground and underground
karst and caves but not deep oceans
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National game parks
National parks are protected areas , where all kinds of organisms are given legal protection.
So they are strictly reserved for the protection , preservation and propagation of wild life.
Human activities , such as grazing , cultivation , hunting, harvesting of the forest wealth etc.. Are strictly forbidden.
Private ownership and habitat manipulation are not permitted. 94 national parks in India Eg: Eravikulam National Parks ( Idukki ) Silent Valley National park ( PKD ) etc…….
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Wildlife sanctuaries
Wildlife sanctuaries are protected areas where legalized protection is offered only for animals.
Private ownership is permitted to a limited extent . Currently 502 sanctuaries present in india. Eg : Thattekad Sanctuaries Parambikulam Sanctuaries etc…..
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Biosphere reserves
Biosphere reserves are protected areas where all biological species are given protection , & multiple land use is permitted.
The protected species include wild populations native tribals , cultivated plants & domesticated animals.
The concept of “Biosphere reserve” was launched in 1975 as a part of the “Man and Biosphere (MAB) programme” of the UNESCO.
Eg : Agasthyamala ( kerala ) Nilgiris Biosphere Reserve ( 23-09-1987) in india 1st declared
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A Biosphere reserve has three zones or areas 1. core zone : no human activity is permitted
2. buffer zone : limited human activity is permitted
3. manipulation zone : free human activities are permitted ( transitional zone )
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World heritage sites
These are internationally well known biodiversity areas , identified by the world heritage committee.
They are characterized by certain geologically , biologically & evolutionarily distinctive features.
Eg : Nanda Devi Biosphere Reserve ( U . P ) Kazhiranga National Park ( Assam)
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Features of world heritage sites
Wilderness areas : large areas , protected less stringently them biosphere reserves. Natural monuments : small areas , selected to protect natural monuments & the surrounding areas. Species management areas : specific areas , selected for the conservation of certain habitats or species which require constant protection. Protected landscapes & seascapes : specific areas of land or sea , selected for the protection & interaction of neighbouring communities
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WILDERNESS AREA
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NATURAL MONUMENTS
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PROTECTED LANDSCAPE AND SEASCAPE
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Ex situ conservation( offsite conservation )
This is the off site conservation of animals and plants outside their natural habitats.
This is particularly important for some endangered species
Eg : zoos , botanical gardens , gene banks , pollen banks , seed banks ,germ plasm banks , tissue culture centers , cryopreservation centers , etc…….
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The emperor Wen- Wang constructed a 600 hectare ‘Garden of intelligence’ in the 12th Century BC
Alexander the great kept tigers and parrots in his court The Romans took many animals out of the wild for their amphitheater
antics
The history of zoos
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London zoo in Regents Park was opened on 27th of April 1828
The history of zoos
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The main aim of a zoo is to house whole animals for breeding and re-introduction
A secondary aim is to educate the public The world zoos conservation strategy estimates that there are
1100 zoos in the world and they receive over 600 million visitors annually
The aims of zoos
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The first deliberate use of a zoo was to prevent extinction of the Arabian Oryx
These animals were hunted by the Bedouin as a test of manhood When spears were swapped for machine guns the numbers declined
Zoo successes – The Arabian Oryx
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Peter Davids DeerPrzewalskis wild horseMauritius kestrelHawaiian gooseEuropean bison
Other zoo successes
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PETER DAVIDS DEER PRZEWALSKIS WILD HORSE
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MAURITIUS KESTREL
HAWAIIN GOOSE
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EUROPEAN BISON
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There are estimated to be around 1600 botanical gardens throughout the world and these receive over 150 million visitors a year .
The Botanic Gardens Conservation Institute (BGCI) was set up in 1987 and its role is to collect and make available information on plant conservation .
These botanical gardens are important as it is estimated that 60,000 plant species could be lost in the next 50 years
Botanical Gardens
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Botanical gardens tend to look after plants in one of the five categories belowo Rare and endangeredo Economically importanto Species that are needed for the restoration of
an ecosystemo Keystone specieso Taxonomically isolated species
Botanical Gardens
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In 1988 there were only 4000 to 5000 individuals of the Torrey pine (Pinus torreyana) in the wild
Botanical Gardens successes – Torrey pine
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The Torrey pine
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In 1989 there was an outbreak of Ips beetles (Ips paraconfusus)
By 1991, 840 trees had died due to the Ips beetle 30,000 seeds from 149 trees were collected Before the trees could be re-introduced the Ips
beetles had to be exterminated
Botanical Gardens successes – Torrey pine
Ips paraconfusus
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In the first 6 months of 1991, 280,000 Ips beetles were caught in funnel traps and the Ips were eliminated by 1992
In 1992 trees were returned Returning progeny to correct area genetically Seeds only had a 2% germination rate Container grown seedlings did well Now there are 6000 individuals in the wild
Botanical Gardens successes – Torrey pine
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Seed banks allow the storage of genetic diversity of whole plant populations
Preserving the seeds for use later is a long process, it involves;o Cleaningo X-ray analysiso Drying, packaging and storageo Germination monitoring
Seed Banks
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Occasionally clean seed is collected in the field More often seed is collected still in its fruit Seed must be taken from the fruit undamaged This reduced bulk and disease risk Seeds are often liberated by hand
Seed Banks – cleaning
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A few seeds are taken and X-rayedThis is done to see how many of the sample are empty
seeds and find any insect larvae hiding in the seedsThe X-rayed seeds are often thrown away afterwards
as they may be genetically damaged
Seed Banks – X-ray analysis
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Drying and freezing the seed increases the time that the seed will last
Seeds are dried in cool conditions (15-18°C) with the relative humidity at 11-15%
This takes about a monthThe seed is then put into an airtight
container and kept at -20 °C
Seed Banks – Drying, Packaging and Storage
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A few seeds are tested for viability once they have been frozen
If they do not germinate they are either dead or dormant, to distinguish between the two states the vital stain Tetrazolium is used
A few seeds are tested every ten years to check germination
Seed Banks – Germination Monitoring
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Gene banks
Gene banks are the collections of DNA samples , together with the samples of the somatic material of organisms.
Gene banks preserve the stocks of both seeds and vegetative materials.
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Major gene banks in India
National Bureau of Plant Genetics Resources , New Delhi for crop plants , medicinal plants etc.. Tropical Botanical Garden & Research Institute ( TBGRI ) ,Palode , TVM for medicinal plants , spices Central Institute for Medical & Aromatic Plants ( CIMAP ) , Lucknow for medicinal plants & spices Central Drug Research Institute , Lucknow for experimental animals
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Germplasm banks
Primarily considers the conservation of the genetic material which may be lost through genetic erosion
In practice , germplasm is a plant part from which new plants can be generated.
Applications are tissue culture and cryopreservation techniques.
Cryopreservation is the preservation of germplasm at an ultra low temperature of -196ºC liquid nitrogen.
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ANAND P P