How does the size of an island generally affect biodiversity and why?
The more isolated an island is, the lower its species richness will be. An island’s size also affects its biodiversity, since larger islands will have a wider variety of habitats, so species which arrive on the island will diversify to fill up the available niches.
How does island distance and size determine the biodiversity of an island?
The size of the island is one of the factors to consider when looking at biodiversity. The bigger the island, the more species can live on the island. There are more resources and less competition.
How does island Distance affect diversity?
Island size can influence species richness through its effect on both colonization and extinction rates (MacArthur & Wilson 1967). … Indeed, geographical distance between islands might be an important source of similarity in terms of species richness and community structure.
What two factors influence the biodiversity of an island?
Terms in this set (29) The number of species found on an island is determined by a balance between two factors: the immigration rate (of species new to the island) from other inhabited areas and the extinction rate (of species established on the island).
How does the size of the island affect the number and composition of the animals?
Extinction rates are related to the size of the island. The smaller the island, the higher the rate of extinction. This is because larger islands contain more resources and habitats, and are thus able to support more life.
How does island size affect the equilibrium number of species?
According to ETIB, the number of species present on an island is determined by a balance between immigration and extinction. … 2) Extinction is higher on small islands than on larger islands, hence the equilibrium number of species present will be greater on large islands.
How does island size affect immigration rate?
The second thing that affects immigration and extinction rates is the size of the island. … Larger islands have more space than smaller islands, so there are likely to be more resources available for species to use. The opposite is true for smaller islands. Therefore extinction rates are larger on small islands.
What happens to diversity the farther an island is to a continent?
Basically, The farther away the island, the less diverse it will be. There are lower immigration rate (organisms leaving). This is the “distance effect”
What are 3 things that influence island biodiversity?
Island biogeography is determined by three processes: immigration, evolution, and extinction. These processes are determined by the area and isolation of islands such that smaller and more isolated islands have lower numbers of species than larger and less isolated islands.
How does biodiversity on each island relate to anticipated speciation rates?
Larger islands have higher habitat diversity and more species, or larger population sizes and low extinction rates. As the age of islands increases, more species are added by speciation, leading to more species per lineage, given all else is constant.
Why do bigger islands have more species?
Larger islands contain larger habitat areas and opportunities for more different varieties of habitat. Larger habitat size reduces the probability of extinction due to chance events. … Over time, the countervailing forces of extinction and immigration result in an equilibrium level of species richness.