BIOS10117 Lecture Notes - Lecture 15: Species Richness, Ecosystem Services, Carrying Capacity

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Dynamic equilibrium bc not staying the same o o. Dashed line is rate at which species are coming/leaving: what the species are will change over time. Carrying capacity and competition will encourage species extinction. Species area curve applies to species richness because island can only hold so many species and it will level off. Smaller island will have less species richness o. With a larger island have more species richness because more available niches. Closer to mainland = higher species richness because immigration is easier and mainland is likely the source of immigration. Order of most species to least: large, close, large, far, small close, small, far. Can apply to habitat fragmentation bc geographically isolated. Roads can also affect animals because they break up habitats. How are habitat fragments different from islands? o o. Terrestrial animals are able to migrate across habitats. Size of habitat fragments can change but islands are specific sizes.

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