BIOL 2060 Lecture Notes - Lecture 10: Caddisfly, Cedar Creek Ecosystem Science Reserve, Species Richness

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Species richness: the number of species occupying a given area. Species evenness: the relative abundance of each species, species diversity is a combo of species richness and evenness, communities with high richness and high evenness are the most diverse. Visualizing species diversity: the rank-abundance curve assess evenness by how shallow lines are. Species richness of mountain stream: most abundant down to least abundance- least abundant species is ranked 75. Question: the figure below shows the rank abundance for two reel fish communities. Patterns in species diversity: latitudinal diversity gradient- across a wide range of taxa there is more diversity at lower latitudes, some communities are notably diverse (e. g. coral reefs, peninsulas tend to have lower than expected diversity. Species-area relationships: larger islands have more species. Islands, fish in lakes, mammals on mountaintops: scaling relationship (slope) is remarkably consistent (0. 2-0. 35, explanations, larger islands might contain unique habitats, constant turn-over through immigration and extinction, passive sampling- bigger target.

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