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2007 Continental Totals for Africa

Reports > Loxodonta africana > 2007 > Africa

All Years for Africa: 2013 — 2007 — 2002 — 1998 — 1995

2007 Summary Totals for Africa

Data Category Definite Probable Possible Speculative
Aerial or Ground Total Counts 52,320 0 0 0
Direct Sample Counts and Reliable Dung Counts 416,703 36,566 36,566 0
Other Dung Counts 601 46,138 8,788 0
Informed Guesses 2,645 0 38,980 6,148
Other Guesses 0 0 0 44,216
Totals 2007 472,269 82,704 84,334 50,364

Interpretation of Changes in Estimates from Previous Report

Cause of Change Definite Probable Possible Speculative
Repeat Survey +53,417 +5,897 +7,763 -617
New Population +4,125 +857 +3,602 +1,480
Different Technique +10,663 +24,031 +2,693 -7,048
Different Area +24,409 -2,631 -2,300 0
New Guess -6,501 -1,283 -9,807 -4,999
New Analysis -6,780 -700 -11,127 -44,885
Population Lost 0 0 -63 -171
Data Degraded -9,131 -2,490 -6,241 +7,297
Totals +70,202 +23,680 -15,479 -48,943

Area of Range Covered by Each Data Category (km²)

Data Category Known Range Possible Range Total Range
Aerial or Ground Total Counts 170,682 12,334 183,016
Direct Sample Counts and Reliable Dung Counts 678,335 36,939 715,274
Other Dung Counts 83,328 24 83,352
Informed Guesses 172,379 30,022 202,400
Other Guesses 411,597 113,026 524,623
Unassessed Range 597,909 1,029,252 1,627,161
Totals 2,114,230 1,221,597 3,335,827

Continental and Regional Totals and Data Quality

Region Definite Probable Possible Speculative Range Area (km²) % of Continental Range % of Range Assessed IQI1 PFS2
Central Africa 10,383 48,936 43,098 34,129 975,079 29 52 .22 1
Eastern Africa 137,485 29,043 35,124 3,543 880,063 26 45 .36 2
Southern Africa 297,718 23,186 24,734 9,753 1,305,140 39 53 .48 1
West Africa 7,487 735 1,129 2,939 175,545 5 66 .44 3
Totals 472,269 82,704 84,334 50,364 3,335,827 100 51 .41

1 IQI: Information Quality Index: This index quantifies overall data quality at the regional level based on the precision of estimates and the proportion of assessed elephant range (i.e. range for which estimates are available). The IQI ranges from zero (no reliable information) to one (perfect information).

2 PFS: Priority for Future Surveys, ranked from 1 to 5 (highest to lowest). Based on the precision of estimates and the proportion of national range accounted for by the site in question, PFS is a measure of the importance and urgency for future population surveys. All areas of unassessed range have a priority of 1. See Introduction for details on how the PFS is derived.

***Note that totals for the Definite, Probable, and Possible categories are derived by pooling the variances of individual estimates, as described at http://www.elephantdatabase.org/reliability. As a result, totals do not necessarily match the simple sum of the entries within a given category.