At the broadest most encompassing level, we have ecosystem diversity. However, species richness increases with sample size. Biological diversity largely describes the change of life from genes to ecosystems, comprising their existences, genetic variations, their environment, populations and the ecosystem in which they are existing and other evolutionary developments that keep the system functioning, changing and adapting. Species diversity Species diversity refers to the variety of different types of species found in a particular area. The effective number of species refers to the number of equally abundant species needed to obtain the same mean proportional species abundance as that observed in the dataset of interest (where all species may not be equally abundant). Main Difference – Genetic Diversity vs Species Diversity. Genetic diversity is the “fundamental currency of diversity” (Williams and Humphires, 1996) that is responsible for variation between individuals, populations and species. An index of diversity combines both the number of different species and the population size of each within a community. Diversity is measured by counting the number of species, assessing the relative abundance of the species, or by using an index which cumulatively analyzes the species richness and abundance. Or a definition of species that is wrong. a. Biodiversity is a term which describes every living organism within a single ecosystem or habitat, including numbers and diversity of species and all environmental aspects such as temperature, oxygen and carbon dioxide levels and climate. Species diversity has two components. The Neotropical catfish genus Kronichthys contains three species distributed along coastal rivers of southern and southeastern Brazil. A species is a group of organisms that share a genetic heritage, are able to interbreed, and to create offspring that are also fertile. Species diversity is the difference between one species and another. Key Difference – Species Richness vs Species Diversity The term biodiversity originates from words ‘biological’ and ‘diversity’. Species Composition Makes Ecosystems Unique. Species diversity best fits the literal translation: the number of different species in a particular ecosystem or on Earth. Biodiversity is a contraction of biological diversity. Other articles where Species abundance is discussed: biogeographic region: Components of species diversity: species richness and relative abundance: 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. Biodiversity Definition. The author begins with a clear definition of biological diversity and a summary of the types of diversity patterns found on Earth. The smallest sample size may be 1 km^ and the largest may be the entire region or country. It includes all the species ranging from plants to different microorganism. The number and variety of species found within a specified geographic region. No two individuals of the same species are exactly similar. Species diversity index. Species diversity Definition Biodiversity at the species level, often combining aspects of species richness , their relative abundance , and their dissimilarity. Species Richness = an index based on the number of species i. For instance, lions and tigers can interbreed and produce fertile offspring. In our biosphere immense diversity (or heterogeneity) exists not only at the species level but at all levels of biological organization ranging from macromolecules within cells to biomes. Species Richness (s) is a relative term that refers to the number of species in a community, and is directly associated with measuring the diversity of species in a given area. Impact of agriculture on species diversity . Species evenness is how evenly spread the population is across the species in an area- if you have 100 cats and 105 dogs, the population has high evenness but if you had 200 cats and 5 dogs, even though the number of animals is the same, the population is not very even. Having a wide variety of different species in an area is a sign of good biodiversity. The level just broader is species diversity, which best fits the literal translation of biodiversity: the number of different species in a particular ecosystem or on Earth. Species richness is the number of species found in an area- you simply count the number of different species. N(N-1)/sum of n(n-1) Where N= total number of organisms in environment and n= total number of organisms of each species. 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