Related topics: species

Two newly recorded species join Thailand's aquatic insect fauna

Caddisflies are an order of aquatic insects with high diversity. In Thailand, more than 1,000 caddisfly species are known to occur, and a recent study in the journal Check List shows that their diversity in the country is ...

Farming more seaweed to be food, feed and fuel

A University of Queensland–led study has shown that expanding global seaweed farming could go a long way to addressing the planet's food security, biodiversity loss and climate change challenges.

A plethora of plant molecules provides a ple"flora" of data

Researchers at the University of Geneva have established a searchable library of spectra and molecules found in a collection of 1,600 plant extracts. This collection was accessed through a collaboration with Pierre Fabre ...

Urban forest-mapping with help from public and private data

A Concordia project cataloging the diversity of the urban forest in a Montreal residential neighborhood is now complete, and the researchers behind it say the results highlight the importance of a diverse city tree population.

Exploring the resilience of blackbucks across India

A new study from the Indian Institute of Science (IISc) sheds light on how blackbucks in India have fared in the face of natural and human-induced challenges to their survival. The work, among the first of its kind in its ...

Taxonomic complexity of Sambucus genus studied

Sambucus L. is a morphologically diverse flora comprising approximately 23 accepted species that are mostly deciduous shrubs, perennial herbs or small trees widespread in almost all regions of the world, excluding extremely ...

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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

This text uses material from Wikipedia, licensed under CC BY-SA