Lecture_24_species abundance and diversity 30Mar2011

Lecture_24_species abundance and diversity 30Mar2011 -...

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CHAPTER 16 Species Abundance and Diversity
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COMMUNITY= an association of interacting  species inhabiting a defined area Can be defined at many different scales e.g., gut flora community e.g., desert mammal community
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We have increased our level of organization - No longer focusing on the populations of organisms and  how they are affected by the    abiotic and biotic components of the environment - Instead….we begin looking at community properties =  COMMUNITY STRUCTURE
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II. Me tho ds  fo r m e a s uring  a nd a s s e s s ing   c o m m unity s truc ture A. De finitio ns : 1. S pe c ie s  c o m po s itio n  =  Kinds  o f s pe c ie s  tha t  m a ke  up the  c o m m unity  2. S pe c ie s  ric hne s s  (S )  =  Num b e r o f s pe c ie s   3.  S pe c ie s  e ve nne s s  (E)  =  Re la tive  a b unda nc e  o f  e a c h o f tho s e  s pe c ie s   4.  Dive rs ity   a  c o m b ina tio n o f S  a nd E. 
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Defining diversity with BOTH a measure of  evenness and richness is much more  insightful than just looking at richness  alone.  Why??  
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There are many different mathematical indices to  measure diversity; we will review only one of these  – the  Shannon-Wiener Diversity Index ( H’ ) H’ = - Σ  (pi)(ln pi)
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5.  Rank-abundance curves  = a visual method to  summarize and compare the evenness and richness  of communities Remember, the lower the slope (flatter the line), the  greater the evenness of the community.
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6.  Community similarity  = the degree to which the  structure of two or more communities are similar  to each other.  Sometimes this is measured as dissimilarity which  quantifies their differences 
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There are many methods to quantify community similarity.   One common method is the  Similarity Coefficient (CCs).  
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Lecture_24_species abundance and diversity 30Mar2011 -...

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