News tagged with species diversity
Related topics: species
Species diversity is an index that incorporates the number of species in an area and also their relative abundance. It is generally a much more useful value than species richness.
The most common index of species diversity is a family of equations called Simpson's Diversity Index.
Here is one such example
D = (n / N)2
Where n is the total number of organisms of a particular species and N is the total number of organisms of all species.D is the value of diversity. It can range between 0 and 1, whre 1 is the richest an Ecosystem can possibly be.
Humans have a huge effect on species diversity; the main reasons are: - Destruction, Modification, and/or Fragmentation of Habitat - Introduction of Exotic Species - Overharvest - Global Climate Change
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Too much antibiotic can decimate the normal intestinal microbiota, which may never recover its former diversity. That, in turn, renders the GI tract vulnerable to being colonized by pathogens. Now researchers from Memorial ...
Immunology Feb 27, 2013 | not rated yet | 0
Eight weeks after antibiotic treatment of infants, the diversity of gastrointestinal flora remained diminished, although the number of individual bacteria was back to normal, according to a paper in the November 2012 issue ...
Medications Nov 09, 2012 | not rated yet | 0