PPT Slide

DESCRIBING SPECIES RICHNESS

1. Direct count of # species in an area -

- a species tally for any given area

a - diversity

2. Species # turnover among areas

within a larger region

b - diversity

THESE ARE DISTINCT ASPECTS

OF DIVERSITY

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A REGION MAY HAVE A RICH BUT UNIFORM BIOTA - HIGH ALPHA; LOW BETA

ANOTHER REGION MAY HAVE LOCALLY LOW RICHNESS, BUT BE VERY HETERO-GENEOUS - HIGH BETA; LOW ALPHA

ALPHA RELATES TO RICHNESS

BETA RELATES TO ENDEMISM - define

question of what size area considered