1 / 16

Factors of Extinction

Factors of Extinction. Why are some species more or less prone to extinction?. Source: http://www.destination360.com/north-america/us/alaska/alaska-whale-watching.php. Source: http://www.biojobblog.com/tags/panda/. Source: http://www.koalas.org/koala-australia.html. Specialization.

lilah-alvarez
Télécharger la présentation

Factors of Extinction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Factors of Extinction Why are some species more or less prone to extinction?

  2. Source: http://www.destination360.com/north-america/us/alaska/alaska-whale-watching.php Source: http://www.biojobblog.com/tags/panda/ Source: http://www.koalas.org/koala-australia.html Specialization • Overspecialization of feeding • Over specialization of habitat

  3. Source: http://www.pbase.com/johncarol/image/73692533 Source: http://www.srgc.org.uk/bulblog/log2007/100107/log.html Reproductive Rate • r versus K strategists

  4. Source: http://www.nytimes.com/2006/07/16/world/europe/16tuna.html Source: http://www.awf.org/section/wildlife/elephants Source: http://animals.nationalgeographic.com/animals/mammals/wolf.html Prey/Man • Man preying on species • Hunting • Trade • Species preying on man or livestock

  5. Trophic level • Higher up in the food chains are more susceptible Source: http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/POD/i/indian-tiger-india-512815-ga.jpg

  6. Interspecific Competition • Nesting sites • Food • Breeding • Habitat Source: http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/POD/a/axis-deer-512754-ga.jpg

  7. Behavior • Migratory Patterns • Fixed • Flexible Source: http://www.ag.gov.au/www/agd/rwpattach.nsf/VAP/(454DFAFE2D6830FB1D0597823A67B5D6)~red+crabs+migration.JPG/$file/red+crabs+migration.JPG Source: http://www.sciencedaily.com/releases/2008/01/080108083008.htm

  8. Distribution • The more limited the more prone Source: http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/POD/p/polar-bear-cubs-492324-ga.jpg Source: http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/POD/g/grassland-kangaroos-76934-ga.jpg

  9. Overall Numbers • The lower the numbers the more prone Source: http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/POD/b/baby-gorilla-gabon-651797-ga.jpg Source: http://animals.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/animals/images/primary/platypus.jpg

  10. Strategies for Success • Generalists over specialists • Diversity • Of ecosystems • Complexity of food webs • Inertia/Constancy • Resilience Source: http://www.staringspestandrodentcontrol.com/files/images/American-cockroach.preview.jpg

  11. Categories and Criteria from: The IUCN Red List of Threatened Species

  12. Conservation Status • Extinct (EX) – there is no reasonable doubt that the last individual has died • Extinct in the Wild (EW) – Known only to survive in cultivation, in captivity, or as a naturalized population well outside the past range

  13. Threatened • Critically Endangered (CR) – Facing an extremely high risk of extinction in the wild • Endangered (EN) – Facing a very high risk of extinction in the wild • Vulnerable (VU) – Facing a high risk of extinction in the wild

  14. Criteria for CR, EN and VU • Reduction of population size by W% over 10 years or 3 generations • Size of geographic range • Population size of mature individuals less than X with continued decline of Y% over 10 years or 3 generations • Population size of mature individuals less than Z • Quantitative analysis showing the probability of extinction in the wild

  15. Conservation Status • Near Threatened (NT) – Close the qualifying for a threatened category in the near future • Least Concern (LC) – Widespread abundant taxa are included in this category

  16. Conservation Status • Data Deficient (DD) - there is inadequate information to make an assessment of the risk of extinction • Not Evaluated (NE) – has not been evaluated against criterion

More Related