This species diversity map is based on all pentads for which there are four or more checklists. It therefore includes all pentads which are shades of green, blue or red on the coverage map. The "species diversity index" used is fully described in a paper by James Harrison and Peter Martinez (Ibis, 1995, 137: 410-417). It was specially designed to deal with the problem of different numbers of checklists per pentad. As the number of checklists increases, the number of species also steadily increases - this is clearly seen on the "species richness map". But the "species diversity index" is more or less stable once there are about 15 checklists for a pentad, and reaches about 92% of its final value after four checklists. The species diversity index cannot be back-transformed into a number of species; a small value indicates "not many species", and a large value indicates "lots of species".
On the species diversity map, yellow indicates lowest diversity and dark blue the highest. The cutpoints between the colours are chosen so that equal numbers of grid cells have the same colour. This map represents "work in progress".
|
|
| Observers |
| 415 |
| Cards submitted: |
| 10722 |
| Pentads covered: |
| 3234 |
| Total number of records: |
| 595564 |
| Total number of incidental records: |
| 35915 |
| Latest Card date: |
| 2009-01-06 |
| Last Update posted: |
| 2009-01-06 21:00 |
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SABAP2 is a joint project of the
Animal Demography Unit
(Department of Zoology, University of Cape Town),
BirdLife South Africa,
&
South African National Biodiversity Institute