Mar community ecology - Introduction o Immigration and reef...

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Introduction o Immigration and reef fish diversity Possible explanations: Post Recruitment  (PR) Competition -> Intense Weak Recruitment modified  by PR processes 1. Competition Model (Smith and Tyler) 3. Predation Disturbance Model (Talbot et al) Recruitment NOT  modified by PR  processes 2. Lottery Model (Sale) 4.  Recruitment Limitation Model  (Victor) o     o In lottery model, when a territory opens, can have territorial creeping, swapping or  larval settlement in open patch End up with a "patchwork" of species over a reef from random settlement of  larvae o Why are there so many different species on a reef? 50% of the explanations are based on larval settlement o What is a  species ? We look at different morphologies-> expressions of genes Reproductively isolated Allopatric speciation - there is a physical barrier that prevents reproduction Sympatric speciation - occurs in place Break-down in sexual attraction? o What is a  community ? Multiple pops of different species within an area at the same time Talk about numbers of species vs number of individuals in a population Fundamentally different: different species occupy different niches and  have different fundamental requirements Hutchinson proposed  niche hypervolume - the sum total of all things a  species requires No 2 species with identical niches will survive in the same area=  interspecific competition o Biodiversity Why it is good: genetic variation (very slow origination)
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Ideas come from the Greeks: biodiversity=stability Community Measures o Species Richness : Number of species per unit area or volume Dependent on sample size Reduce this problem by taking consistent sample sizes We now use ECOSIM to predict the #of species in an environ. Hessler found both # of species and # of individs were an order of magnitude  greater in deep sea o Species Diversity : Includes species # and evenness Diversity indices: Simpson' s: relies on probabilities What is probability of getting 2 same species in a sample? If result is close to 1, is very likely
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This note was uploaded on 04/13/2008 for the course MSCI 438 taught by Professor Walters during the Spring '08 term at Coastal Carolina University.

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Mar community ecology - Introduction o Immigration and reef...

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