06 December 2009

Bird Species Diversity

There are 3 types of diversity: alpha diversity (at single point, restricted area); beta (between point diversity, comparing different alpha diversities); and gamma (broad geographic scale). If point A has 30 species, point B has 30 species and point C has 30 species, and none of these species are shared, then alpha diversity is 30, beta is 60 and gamma is 90. If the points have the same species, then alpha = beta.

Thre are three types of patterns of diversity. You have latitudinal. In Maine you have alpha diversities around 18 (and gamma of 45); Louisiana 30 (150); Mexico 50 (300); Costa Rica 60 (400); Panama 80 (500); Amazon 125 (600). (An interesting exception is that alpha diversities in grasslands remain a fairly constant 5).

Altitudinal (Peru) beta diversity: 500' 200; 5600 144; 6500 128; 8000 106; 9800 66; 11000 25.


Habitat: as you go from grassland to mature forest, you see the following patterns: grassland 5; shrub 10; 2` growth 15; 1` growth 30

The question now arises, HOW DO YOU ADD SPECIES TO A COMMUNITY?

Buff-breasted Sandpiper

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