- Ex-situ conservation
Ex-situ conservation means literally, "off-site conservation". It is the process of protecting an
endangered speciesof plant or animal by removing part of the populationfrom a threatened habitat and placing it in a new location, which may be a wild area or within the care of humans. While ex-situ conservation comprises some of the oldest and best known conservation methods, it also involves newer, sometimes controversial laboratory methods.
Normally the best method of maximizing a species chance of survival (when ex-situ methods are required) is by relocating part of the population to a less threatened location. It is extremely difficult to mimic the environment of the original colony location given the large number of variables defining the original colony (
microclimate, soils, symbioticspecies, absence of severe predation, etc.) It is also technically challenging to uproot (in the case of plants) or trap (in the case of animals) the required organisms without undue harm.
An example of colony relocation in the wild is the case of the endangered
Santa Cruz Tarweed, a new colony of which was discovered during a mid 1980s survey at the site of a proposed shopping center in as western Contra Costa County. Once the city of Pinole had decided to approve the shopping center, the city relied on a relocation plan developed by Earth Metrics scientists to remove the entire colony to a nearby location immediately east of Interstate Highway 80 within the Caltransright-of-way [Gary Deghi, C. Michael Hogan et al., "Final Environmental Impact Report of the Pinole Valley Shopping Center", City of Pinole, Earth Metrics Incorporated, California Environmental Clearinghouse (1986)]
Human care methods
Zoos and botanical gardens are the most conventional methods of ex-situ conservation, all of which house whole, protected specimens for breeding and reintroduction into the wild when necessary and possible. These facilities provide not only housing and care for specimens of endangered species, but also have an educational value. They inform the public of the threatened status of endangered species and of those factors which cause the threat, with the hope of creating public interest in stopping and reversing those factors which jeopardize a species' survival in the first place. They are the most publicly visited ex-situ conservation sites, with the WZCS (World Zoo Conservation Strategy) estimating that the 1100 organized zoos in the world receive more than 600 million visitors annually.Fact|date=April 2008
Endangered plants may also be preserved in part through
seedbanks or germplasmbanks. The term seedbank sometimes refers to a cryogenic laboratory facility in which the seeds of certain species can be preserved for up to a century or more without losing their fertility. It can also be used to refer to a special type of arboretum where seeds are harvested and the crop is rotated. For plants that cannot be preserved in seedbanks, the only other option for preserving germplasm is in-vitrostorage, where cuttings of plants are kept under strict conditions in glass tubes and vessels.
Endangered animal species are preserved using similar techniques. The genetic information needed in the future to reproduce endangered animal species can be preserved in
genebanks, which consist of cryogenicfacilities used to store living sperm, eggs, or embryos. The Zoological Society of San Diego has established a " Frozen zoo" to store such samples using modern cryopreservationtechniques from more than 355 species, including mammals, reptiles, and birds. Showy Indian clover, "Trifolium amoenum", is an example of a species that was thought to be extinct, but was rediscovered in 1993 [Connors, P. G. (1994) "Rediscovery of showy Indian clover". Fremontia 22: 3–7] by Peter Connors in the form of a single plant a site in western Sonoma County. [U.S. Fish and Wildlife Service, Arcata Division, 1655 Heindon Road, Arcata, Ca.] Connors harvested seeds and grew specimens of this critically endangered speciesin a controlled environment.
Wollemi Pineis an another example of a plant that is being preserved via ex-situ conservation, as they are being grown in nurseries to be sold to the general public.
Ex-situ conservation, while helpful in man's efforts to sustain and protect our environment, is rarely enough to save a species from extinction. It is to be used as a last resort, or as a supplement to
in-situ conservationbecause it cannot recreate the habitat as a whole: the entire genetic variationof a species, its symbiotic counterparts, or those elements which, over time, might help a species adapt to its changing surroundings. Instead, ex-situ conservation removes the species from its natural ecological contexts, preserving it under semi-isolated conditions whereby natural evolution and adaptation processes are either temporarily halted or altered by introducing the specimen to an unnatural habitat. In the case of cryogenicstorage methods, the preserved specimen's adaptation processes are frozen altogether. The downside to this is that, when re-released, the species may lack the genetic adaptations and mutations which would allow it to thrive in its ever-changing natural habitat.
Furthermore, ex-situ conservation techniques are often costly, with cryogenic storage being economically infeasible in most cases since species stored in this manner cannot provide a profit but instead slowly drain the financial resources of the government or organization determined to operate them.
Seedbanks are ineffective for certain plant genera with recalcitrant seeds that do not remain fertile for long periods of time. Diseases and pests foreign to the species, to which the species has no natural defense, may also cripple crops of protected plants in ex-situ plantations and in animals living in ex-situ breeding grounds. These factors, combined with the specific environmental needs of many species, some of which are nearly impossible to recreate by man, make ex-situ conservation impossible for a great number of the world's endangered flora and fauna.
In vitro fertilisation
Intracytoplasmic sperm injection
List of animals that have been cloned
World Conservation Union(IUCN)
4. cite book
author=Engels, J.M.M. and L. Visser, editors.
title=A Guide to Effective Management of Germplasm Collections
publisher= CABI, IFPRI, IPGRI, SGRP
url=http://www.bioversityinternational.org/Publications/pubfile.asp?ID_PUB=899 174 p.
5. cite book
author=Kameswara, N., J. Hanson, M. E. Dulloo, K. Ghosh, A. Nowell and M. Larinde.
title=Manual of Seed Handling in Genebanks
publisher=Bioversity International, CTA (Technical Center for Agricultural and Rural Cooperation), FAO, ILRI
url=http://www.bioversityinternational.org/Publications/pubfile.asp?ID_PUB=1167 147 p.
6. cite book
author= Koo, B., Pardey, P. G., Wright, B. D., et al.
publisher= CABI, IFPRI, IPGRI, SGRP
* [http://www.bioversityinternational.org/Themes/Conservation_and_Use/index.asp#Ex_situ_conservation Ex situ conservation]
* [http://www.messybeast.com/clonecat.htm The Pros and Cons of Cloning (and Other Reproduction Techonology Techniques)]
* [http://archives.cnn.com/2002/WORLD/asiapcf/auspac/05/28/aust.thylacines/ Cloning to revive extinct species, May 28, 2002, By Grant Holloway “CNN”]
* [http://nationalzoo.si.edu/ConservationAndScience/ReproductiveScience/ConsEndangeredCats/default.cfm Reproductive Technologies and Conservation of Endangered Cats]
* [http://news.bbc.co.uk/2/hi/science/nature/4547533.stm Louisiana's frozen ark]
* [http://www.iucn.org/ The World Conservation Union (IUCN)]
* [http://www.iucnredlist.org/ IUCN Red List of Threatened Species]
* [http://www.biodiv.org/default.shtml The Convention on Biological Diversity]
* [http://www.cbsg.org/index.php Conservation Breeding Specialist Group, IUCN]
* [http://www.awdconservancy.org/ African Wild Dog Conservancy]
* [http://www.cbsg.org/reports/mammals.php Conservation Breeding Specialist Group, IUCN: CBSG “PHVA” Reports (Population and Habitat Viability Assessment)]
* [http://www.iucnsscrsg.org/ IUCN/SSC Re-introduction Specialist Group]
* [http://www.fao.org/docrep/004/T0559E/T0559E00.htm#TOC ONLINE BOOK: “In situ conservation of livestock and poultry”, 1992, Food and Agriculture Organization of the United Nations and the United Nations Environment Programme]
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Look at other dictionaries:
ex situ conservation — conservation of species or populations outside their natural area of distribution or habitats, cf. in situ conservation … Dictionary of ichthyology
In-situ conservation — means on site conservation . It is the process of protecting an endangered plant or animal species in its natural habitat, either by protecting or cleaning up the habitat itself, or by defending the species from predators. Increasingly, this term … Wikipedia
ex situ conservation — maistinių ir žemės ūkio augalų genetinių išteklių išsaugojimas ex situ statusas Aprobuotas sritis augalų genetiniai ištekliai apibrėžtis Maistinių ir žemės ūkio augalų genetinių išteklių palaikymas už jų natūralios augavietės ribų. atitikmenys:… … Lithuanian dictionary (lietuvių žodynas)
in situ conservation — maistinių ir žemės ūkio augalų genetinių išteklių išsaugojimas in situ statusas Aprobuotas sritis augalų genetiniai ištekliai apibrėžtis Ekosistemų, natūralių augaviečių, gyvybingų rūšių populiacijų palaikymas arba atauginimas natūralioje… … Lithuanian dictionary (lietuvių žodynas)
in situ conservation — preserving habits and the species therein, cf. ex situ conservation … Dictionary of ichthyology
ex-situ conservation — Conservation method that entails the removal of seed, pollen, or plants from their original habitat, keeping these resources of biodiversity alive outside of their natural environment … Expanded glossary of Cycad terms
ex-situ conservation — The conservation of components of biological diversity outside their natural habitats … Glossary of Biotechnology
in-situ conservation — The conservation of ecosystems and natural habitats and the maintenance and recovery of viable populations of species in their natural surroundings and, in the case of domesticated or cultivated species, in the surroundings where they have… … Glossary of Biotechnology
ex situ conservation of national plant genetic resources — augalų nacionalinių genetinių išteklių išsaugojimas ex situ statusas Aprobuotas sritis genetiniai augalų ištekliai apibrėžtis Augalų nacionalinių genetinių išteklių išsaugojimas už jų gamtinės augavietės ar jų sukūrimo aplinkos ribų. atitikmenys … Lithuanian dictionary (lietuvių žodynas)
in situ conservation of national plant genetic resources — augalų nacionalinių genetinių išteklių išsaugojimas in situ statusas Aprobuotas sritis genetiniai augalų ištekliai apibrėžtis Augalų nacionalinių genetinių išteklių išsaugojimas jų gamtinėse augavietėse ar jų sukūrimo aplinkoje. atitikmenys: angl … Lithuanian dictionary (lietuvių žodynas)