What two factors determine species diversity on an island?

What two factors determine species diversity on an island?

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).

What two factors have contributed to the diversity of species?

Several factors contribute to species diversity, including habitat diversity, competition among species, and genetic diversity. Genetic diversity within a species not only is necessary to maintain diversity among species,6 but also contributes to the diversity of food, fiber, and medicines available from nature.

What factors determine the number of species found on an island?

The numbers of species on islands were multiply regressed, separately for cays and continental islands, against seven independent variables: latitude, longitude, insular area, insular height, rainfall, distance to mainland and distance to nearest larger land mass (whether mainland or another island).

What is the biggest determinant of the number of species on an island?

They found that area was the strongest determinant of island species number, followed by isolation, temperature and precipitation.

What are the two most important factors that determine the amount of species diversity in a given place?

The two factors that determine the species diversity found in isolated ecosystem such as an island is its size and distance from the nearest mainland.

What are the two rules of the theory of island biogeography?

The two main predictions of Island Biogeography Theory are: 1. Islands close to a source area will have a higher number of species than islands of equivalent area that are further from the source area. 2. Larger islands will have more species than smaller islands located at similar distances from the source area.

What two characteristics of an island influence the number of species that are found on the island?

According to ETIB, the number of species present on an island is determined by a balance between immigration and extinction. Generally, as the number of species present increases, the immigration rate decreases and the extinction rate increases.

What is the theory of island biodiversity?

The theory of island biogeography explains that the biodiversity and number of species inhabiting an island is impacted by the island's land size and degree of isolation. Larger, less isolated islands have higher numbers of species, while smaller, more isolated islands have lower numbers of species.

Why do large 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. Habitat heterogeneity increases the number of species that will be successful after immigration.

What are the three factors that influence species composition on an island?

There are three main factors that affect species diversity on these islands: immigration, which is species coming to the island; emigration, which is species leaving the island; and extinction, which is species becoming extinct.

Why do some islands have more species than others?

Wilson, developed the theory of island biogeography, predicting that the number of species on an island depends on a balance between colonization, evolution of novel species in the islands, and extinction, and that these processes are determined by the size and isolation of the island.

Why are islands so diverse?

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.

What two factors affect the immigration and extinction rates of species on an island?

The Equilibrium Model of Island Biogeography (EMIB) states that, other things being equal, area and geographic isolation are the two main factors determining extinction and immigration rates, which in turn regulate the level of species richness that is reached at a dynamic equilibrium (1), (2).

What factors affect island biogeography?

Factors that influence the creation and longevity of island biogeography include the degree that the zone is isolated, or the distance between the next nearest landform and continental mainland; how long the area has been isolated from other regions around it and how close it is to achieving equilibrium (or how long it …

What influences island biodiversity?

The theory of island biogeography explains that the biodiversity and number of species inhabiting an island is impacted by the island's land size and degree of isolation. Larger, less isolated islands have higher numbers of species, while smaller, more isolated islands have lower numbers of species.

Why do islands have more biodiversity?

Islands are home to a significant part of global biodiversity due to a very high level of species endemism, unique functional traits, and spectacular evolutionary patterns, such as adaptive radiations or examples of replicated convergent evolution (12, 13).

How do species get on islands?

New species cannot immigrate via land, and instead must arrive via air, water, or wind. As a result, organisms with high dispersal capabilities, such as plants and birds, are much more common on islands than are poorly dispersing taxa like mammals.

What factors influence island biogeography?

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.