LAB.island Biogeography Simulation Lab.pdf - Name:_ Class:_...

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Name:__________________________________________ Class:______ Date:__________________________Island BiogeographyBackground:Island biogeography is the study of community diversity on islands.One of the variables studiedis the rate of colonization by additional species – called recruitment.The farther an island isfrom the mainland (or the source of colonists), the less frequently new colonists will arrive andbecome established.Also, the larger an island, the more likely it is that colonists are able to“find” that space and establish themselves on the island.Another variable is the carrying capacity of the island.Small islands contain fewer resourcesand support populations of fewer individuals. Small populations are more susceptible to localextinction; so small islands have fewer species than equivalent large islands.Small islands alsohave a higher ratio of perimeter to area than larger islands.This is important because at theborders of habitats, the physical conditions are often a combination of the conditions of eitherhabitat.An example on oceanic islands is the perimeter of the forest, which will be buffeted bysalt spray, while the forest’s center will not be.This creates an “edge effect.”The principles from island biogeography can easily be applied to terrestrial situations.Forexample, alpine habitats are usually separated by lowland habitats, and lake habitats areseparated by terrestrial and stream habitats.Fragmented habitats, such as rainforest parcelsseparated by farmlands, can be considered “islands.” Many wildlife managers have taken theeffects of “island” size into account and have begun to link smaller fragments of habitat togetherusing small corridors to effectively increase the island size.(Costa Rica is an example.)Therehas also been increasing concern that if a catastrophe damages a nature preserve that isessentially an island, the preserve may not recover quickly unless there is a source of colonists(equivalent to the mainland) fairly close by.Procedure:1)Go to the Virtual Biology Lab page (link above). Read theBackground Informationthenclick the home button2)Watch theTutorialthen click the home button.3)ClickRun Experiments
Name:__________________________________________ Class:______ Date:__________________________Run 11)Set Island 1 to 130 Km distance.2)Set Island 2 to 410 Km distance.3)Set Taxon to Birds4)Click the arrow to the data section and allow it to run for 500s.5)Record the number of individuals (ni) of each species in the data table.6)Sum the nifor each island, for each species - show your work7)Calculate the relative abundance for each speciespi=(ni/N) show your worki.25.25.2500000000.2500004

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Term
Fall
Professor
NoProfessor
Tags
Species II, Species III, additional species, Set island

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