BIOL 2600 Lecture Notes - Lecture 3: Invertebrate, Competitive Exclusion Principle, Protozoa
14 Jan 2018
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Document Summary
Island biogeography theory: describes the amount of habitat required to sustain a community in terms of an island. Suggests that larger islands are better at maintaining biodiversity. For example, elephant decline in the last century was the result of human population growth. Because of this, elephants were forced to move to suboptimal habitats and these confined habitats lead to overgrazing. Following major droughts, elephants died by the thousands. Weaknesses with island biogeography theory: does not predict which species will be affected, assumes habitat landscape is static and does not consider: Sloss: a debate in ecology during the 1970s as to whether a single large or several small reserves were a better means of conserving biodiversity in a fragmented habitat. Since species richness increases with habitat area, a larger block of habitat would support more species than many smaller blocks. Because most canadian parks are too small on average, we need habitat connectivity.
