Quiz7Key - 4 On rocky intertidal habitats name two abiotic...

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NAME_______________________________________ MNS320 Spring 2010 1) Draw a graph of how disturbance is predicted to affect diversity (3 pts). Simple IDH graph – 1 pt for each axis labeled properly, 1pt for the shape of the curve. 2) Describe mechanisms at each of three points on the graph (3pts). Low – disturbance infrequent, good competitors dominate and drive diversity down Intermediate – disturbance creates open space for species to colonize, diversity goes up. High – disturbance is too frequent that it prevents species from colonizing, driving diversity down – only good dispersers or sp. Resistant to disturbance can persist. 3) What is a keystone species? A single sentence does the trick… (1pt) A species that can influence diversity in a community
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Unformatted text preview: 4) On rocky intertidal habitats, name two abiotic forces that can affect individual survival and consequently the distribution of that species. (2 pts). Wave action – desiccation – temperature - salinity 5) Temperature can vary along a vertical gradient along the intertidal; but can species perceive such variation at smaller scales, say just on a rock? (YES / NO) (1pt). YES 6) What is usually the first thing that happens when a patch is exposed on a rock after a disturbance event? (1pt). New propagules arrive. 7) Estuaries are influenced by which two main forces? (2pts) Tides and salinity 7) How do individuals (either larvae, juvenile or adult stages) enter or exit an estuary? (2pts) With the tides....
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This note was uploaded on 09/26/2010 for the course MNS 320 taught by Professor Staff during the Spring '08 term at University of Texas.

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