What is the species richness distribution?

Species richness is the number of different species represented in an ecological community, landscape or region. Species richness is simply a count of species, and it does not take into account the abundances of the species or their relative abundance distributions.

What is the connection between species richness abundance and evenness?

Species abundance is the number of individuals per species, and relative abundance refers to the evenness of distribution of individuals among species in a community. Two communities may be equally rich in species but differ in relative abundance.

What is global plant distribution?

There is a wide range of variations in the distribution of vegetation on the globe. There is a zonal pattern of vegetation from equator towards the poles and from seal level to vegetation level on the high mountains.

What is global distribution of biodiversity?

A relatively small number of countries (17) have less than 10% of the global surface, but support more than 70% of the biological diversity on earth. Countries rich in biological diversity and associated traditional knowledge belong to a group known as the Like Minded Megadiverse Countries (LMMC).

Is there a relationship between species richness and evenness?

Although many ecologists focus on the relationship between species richness (S) and evenness (E), conflicts between observation and theory are difficult to reconcile. Empirical S-E relationships were not consistent, while relationships show strong correlation between S …

What does evenness mean in terms of biodiversity?

Evenness = Proportions of species or functional groups present on a site. The more equal species are in proportion to each other the greater the evenness of the site. A site with low evenness indicates that a few species dominate the site. Diversity can be use to describe variation in several forms: Genetic (species, varieties, etc.)

Why are species richness estimates based on range maps?

Becausespeciesdonotoccureverywherewithintheirgeographic range, estimates of species richness based on fine-scale atlas data are typically lower than richness estimates based on overlaying range maps (Figs. 3 and 4).

How are species richness and composition related to environmental gradients?

Plant community properties such as species richness, evenness, and composition vary along environmental gradients. Arid and semi-arid ecosystems, such as the central Tibetan Plateau, are thought to be sensitive to changes in temperature and water availability, and also influenced by a long history of herbivore grazing.