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=== ** How does the increasing number of endangered animals impact the food chain? ** ===



** Introduction ** Biologists estimated that the number of extinct and endangered species have increased at least a thousand times greater. Even the thriving food webs that has been stable for many years changed. For example three-quarters of the essential group, the marine fishes, are endangered, which has altered the food chain. In 50 years, one-quarter of all species could be extinct. This issue has become extreme in the past few decades as the population of the extinct increased. Strong interactions and the position of the species in the food chain have significant effects on the increasing number of endangered and extinct species. If one insignificant group of animals, a group that does not have many interactions between the other species, becomes extinct, then only some of the species will be affected. However, as the keystone becomes extinct, it causes the whole food chain to collapse because of the strong connections amongst other species.

These are some of the examples of endangered species Endangered Species

Causes of the Extinction of Species How does this affect humans? What is being done right now to prevent further extinctions?

Websites
 * Sources**
 * "Endangered Species - Causes of extinction and endangerment, How many endangered species are there?." __Science Clarified__. 27 May 2009 .


 * "ScienceDirect - Ecological Modelling : Food web structure affects the extinction risk of species in ecological communities ." __ScienceDirect - Home__ . 27 May 2009 .


 * "Shark species face extinction amid overfishing and appetite for fins | Environment | The Guardian ." __Latest news, sport, business, comment and reviews from the Guardian | guardian.co.uk__ . 27 May 2009 .


 * logic, simple, and that explains why we should be so worried about extinctions.. "New Statesman - The extinction of species and why it matters more than you think." __New Statesman__. 27 May 2009 .


 * "Shark-hunting harms animals at bottom of the food chain « Not Exactly Rocket Science." __Not Exactly Rocket Science__. 27 May 2009 .


 * "Extinction: Polar Bear « All Animals Matter." __All Animals Matter__. 27 May 2009 .


 * "Field Reports: Tiger Farms: A ticket to Extinction." __Field Reports__. 27 May 2009 .


 * "Human Impact Upon Extinction Rates ." __Science & Spirit__. 27 May 2009 


 * "University of Leeds | For the media | Press releases | Biodiversity explained." __University of Leeds__. 28 May 2009 .


 * herbicides. "Causes of Species Extinction: Conservation : Biology: SparkNotes: 101s." __SparkNotes: Today's Most Popular Study Guides__. 28 May 2009 .

Images
 * Digital image. [Polar Bear on melting ice]. .. 28 May 2009 .


 * Katie. __Google__. Digital image. [Food Chain]. -. 28 May 2009 .

Videos
 * "YouTube - Human Impacts On the Environment." __YouTube - Broadcast Yourself.__. 28 May 2009 .


 * "YouTube - Shark Water Trailer." __YouTube - Broadcast Yourself.__. 28 May 2009 .