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Biodiversity Essay

5494 words - 22 pages

BiodiversityCoral reefs are amongst the most diverse ecosystems on earth.Rainforests are an example of biodiversity on the planet and typically possess a great deal of species diversity. This is the Gambia River in Senegal'sNiokolo-Koba National Park.Biodiversity is the degree of variation of life.[1] This can refer to genetic variation, species variation, or ecosystem variation[1] within an area, biome, or planet. Terrestrial biodiversity tends to be highest at low latitudes near the equator,[2] which seems to be the result of the warm climate and high primary productivity.[3] Marine biodiversity tends to be highest along coasts in the Western Pacific, where sea surface temperature is highest and in mid-latitudinal band in all oceans.[4] Biodiversity generally tends to cluster in hotspots,[5] and has been increasing through time[6] [7] but will be likely to slow in the future.[8]Rapid environmental changes typically cause mass extinctions.[9 ] [10] [11] One estimate is that <1%-3% of the species that have existed on Earth are extant.[12]Since life began on Earth, five major mass extinctions and several minor events have led to large and sudden drops in biodiversity. The Phanerozoic eon (the last 540 million years) marked a rapid growth in biodiversity via the Cambrian explosion-a period during which the majority of multicellular phyla first appeared.[13] The next 400 million years included repeated, massive biodiversity losses classified as mass extinction events. In the Carboniferous, rainforest collapse led to a great loss of plant and animal life.[14] The Permian-Triassic extinction event, 251 million years ago, was the worst; vertebrate recovery took 30 million years.[15] The most recent, theCretaceous-Paleogene extinction event, occurred 65 million years ago and has often attracted more attention than others because it resulted in the extinction of thedinosaurs.[16]The period since the emergence of humans has displayed an ongoing biodiversity reduction and an accompanying loss of genetic diversity. Named the Holocene extinction, the reduction is caused primarily by human impacts, particularly habitatdestruction. Conversely, biodiversity impacts human health in a number of ways, both positively and negatively.[17]The United Nations designated 2011-2020 as the United Nations Decade on Biodiversity.Etymology[edit]The term biological diversity was used first by wildlife scientist and conservationist Raymond F. Dasmann in the 1968 lay book A Different Kind of Country[18] advocating conservation. The term was widely adopted only after more than a decade, when in the 1980s it came into common usage in science and environmental policy. Thomas Lovejoy, in the foreword to the bookConservation Biology,[19] introduced the term to the scientific community. Until then the term "natural diversity" was common, introduced by The Science Division of The Nature Conservancy in an important 1975 study, "The Preservation of Natural Diversity." By the early...

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