advertisement
Reference Terms
from Wikipedia, the free encyclopedia

1

2

Biodiversity

Biodiversity or biological diversity is the diversity of life.

There are a number of definitions and measures of biodiversity.

Biodiversity is commonly identified at three levels.

First there is genetic diversity, which is the diversity of genes within a species.

There is a genetic variability among the populations and the individuals of the same species.

Secondly there is species diversity, or diversity among species in an ecosystem. "Biodiversity hotspots" are excellent examples of species diversity.

Third there is ecosystem diversity, diversity at a higher level of organization, the ecosystem.

This has to do with the variety of ecosystems on Earth.

Since 1986 the terms and the concept have achieved widespread use among biologists, environmentalists, political leaders, and concerned citizens worldwide.

This use has coincided with the expansion of concern over extinction observed in the last decades of the 20th century.

Note:   The above text is excerpted from the Wikipedia article "Biodiversity", which has been released under the GNU Free Documentation License.
Related Stories
 

1

2


Earth & Climate News
August 11, 2020

Plants are factories that manufacture yield from light and carbon dioxide -- but parts of this complex process, called photosynthesis, are hindered by a lack of raw materials ...
A new study supports predictions that the Arctic could be free of sea ice ...
A large number of the valley networks scarring Mars's surface were carved by water melting beneath glacial ice, not by free-flowing rivers as previously thought, according to ...
Ancient sediment found in a central Texas cave appears to solve the mystery of why the Earth cooled suddenly about 13,000 ...
Latest Headlines
updated 12:56 pm ET