The variety of life in the world or in a particular habitat or ecosystem.
A large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
Still in existence; surviving
(Of a species, family, or other larger group) Having no living members; no longer in existence
Define genetic drift
Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce
Define species evenness
It refers to how close in numbers each species in an environment is. It is a measure of the relative abundance of the different species making up the richness of an area.
Define species richness
The number of species per sample.
Approximately how many species have biologists identified so far?
List and explain the three levels of biodiversity.
Genetic diversity is all the different genes contained in all individual plants, animals, fungi, and microorganisms. It occurs within a species as well as between species.
Species diversity is all the differences within and between populations of species, as well as between different species.
Ecosystem diversity is all the different habitats, biological communities, and ecological processes, as well as variation within individual ecosystems.
What does kinship measure mean?
A mean kinship value is calculated for each animal in the population using a formula. Mean kinship gives a numerical value to how closely related each animal is to the population.
What are the two components of species diversity?
Species richness and relative abundance
How are the two components of species diversity different?
Species richness is the number of species per sample.
Relative abundance is the number of individuals per species.
What 2 climatic factors influence the distribution of biomes around the Earth?
Water and temperature
How are ecology and evolution tightly linked?
Because evolution results in organisms that are best suited to survive and reproduce in a given environment.
Why do we focus on the Species level?
Because the species level is easier to work with. Species are relatively easy to identify.
In biology, what is a key?
Keys are used to identify different species. A key will usually ask questions based on easily identifiable features of an organism.
What would make one community more diverse than another?
Species richness, which is the number of species in a community.
How is the Diversity Index value used to measure species?
It is a quantitative measure that reflects how many different types (such as species) there are in a data set. The value of a diversity index increases both when the number of types increases and when evenness increases.