Related topics: species

Rethinking the wild world of species diversity in microbes

University of Maryland biologists developed the first mathematical simulations of bacterial communities that incorporate the complex interactions and rapid evolution among bacteria and reflect the tremendous species diversity ...

Researchers make major discovery in the animal kingdom

Researchers recently made a major discovery—14 new species of shrews, which is the largest number of new mammals described in a scientific paper since 1931. After a decade-long journey taking inventory of Indonesian shrews ...

Mapping eukaryotic plankton globally in all their diversity

Eukaryotic plankton are an essential and highly diverse component of marine ecosystems. A research team from École Normale Supérieure (ENS) Paris, University of Turku and Anton Dohrn Zoological Station in Naples established ...

Could one bacterium put damselflies in distress? 

Many insect species are currently expanding their geographical ranges in response to climate change. In the northern hemisphere, most of these species are moving northward, to escape the warming climate in the south.

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Species diversity

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[1].

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

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