Copy_of_Island_Biogeography_Lab - Name: Period: Group...

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Name:Period:Group members:Island Biogeography LabBackground:Island biogeography is the study of community diversity on islands. One of the variables studied is therate of colonization by additional species – called recruitment. The farther an island is from the mainland(or the source of colonists), the less frequently new colonists will arrive and become established. Also,the larger an island, the more likely it is more colonists to “find” that space and establish themselves onthe island.Another variable is the carrying capacity of the island. Small islands contain fewer resources and supportpopulations of fewer individuals. Small populations are more susceptible to local extinction; so smallislands have fewer species than equivalent large islands. Small islands also have a higher ratio ofperimeter to area than larger islands.This is important because at the borders of habitats, the physicalconditions are often a combination of the conditions of either habitat. An example on oceanic islands isthe perimeter of the forest, which will be buffeted by salt spray, while the forest’s center will not be.Thiscreates an “edge effect.”The principles from island biogeography can easily be applied to terrestrial situations. For example,alpine habitats are usually separated by lowland habitats, and lake habitats are separated by terrestrial andstream habitats. Fragmented habitats, such as rainforest parcels separated by farmlands, can beconsidered “islands.” Many wildlife managers have taken the effects of “island” size into account andhave begun to link smaller fragments of habitat together using small corridors to effectively increase theisland size. (Costa Rica is an example.)There has also been increasing concern that if a catastrophedamages a nature preserve that is essentially an island, the preserve may not recover quickly unless thereis a source of colonists (equivalent to the mainland) fairly close by.

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Term
Spring
Professor
N/A
Tags
Species II, Species III, Set island

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