Biodiversity crisis
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Reason: Origin of the lemma definition unclear. The year "1950" does not appear in both of the websites cited as a reference (the special IUCN page is now down; archive link: [1] ). Other sources refer to “biodiversity crisis” on other fixed points in time, for example the 17th century [2] . With regard to its substance, the article has in fact no independent right to exist compared to the section on loss of biodiversity in the article biodiversity . Replacing the article text by forwarding it to the aforementioned section in the article biodiversity would in fact not result in any loss of information. The fact that a seminar paper was cited here despite sufficient scientific sources (hardly any branch in basic biological research is currently funded in this way and therefore has such a high output as biodiversity research) can also be viewed as a serious quality deficiency ... - Gretarsson ( discussion ) 16:15, 26 Mar 2019 (CET)
The rapid and numerically greater loss of animal and plant species is seen as a biodiversity crisis ; Landscapes and biological and genetic diversity since the second half of the 20th century .
causes
The most important anthropogenic factors for species extinction and loss of diversity are widely recognized:
- Destruction of natural habitats (through climate change , sealing , rededication, etc.)
- the hunt
- Naturalization of Alien Species .
However, the most important factor seems to be the direct loss of habitat .
Relationship between habitat size and number of species
The number of species increases with the size of the available habitat or decreases with loss of habitat. Twice as many species live on an island ten times the size or an island-like isolated habitat. Accordingly, information can now also be given about how many species will disappear if the size of their natural habitat is reduced.
Assuming that ten million hectares of tropical forest are destroyed every year , scientists assume that species will decline by 4 to 8 percent over the next 25 years.
Web links
Individual evidence
- ^ LWL - Biodiversity Crisis - Westphalia Regional. Retrieved June 29, 2019 .
- ↑ http://www.biologie.uni-ulm.de/bio3/CostaRicaWeb/SeminarMonika.htm