Estimates from Surveys | Guesses | % Known and Possible Range | Area (km2) | |||
---|---|---|---|---|---|---|
Survey category | Estimate | ± 95% CL | From | To | ||
Aerial Total Counts | 484 | — | — | — | 1.0 | 819 |
Aerial Sample Counts | 82,126 | 8,589 | — | — | 80.6 | 65,502 |
Informed Guesses | 20 | — | 527 | 567 | 4.6 | 3,777 |
Other Guesses | — | — | 1,091 | 1,221 | 10.3 | 8,399 |
Degraded Data | — | — | 17 | 17 | 0.4 | 342 |
Totals 2015 | 82,630 | 8,589 | 1,635 | 1,805 | ||
Totals 2006 | 93,122 | 7,068 | 534 | 625 | ||
Assessed Range | 97.1 | 78,839 | ||||
Unassessed Range | 2.9 | 2,389 | ||||
Total Range | 100 | 81,228 |
Data Category | Definite | Probable | Possible | Speculative |
---|---|---|---|---|
Aerial or Ground Total Counts | 484 | 0 | 0 | 0 |
Direct Sample Counts and Reliable Dung Counts | 73,537 | 8,589 | 8,589 | 0 |
Informed Guesses | 20 | 0 | 527 | 40 |
Other Guesses | 181 | 0 | 0 | 1,101 |
Totals 2015 | 74,222 | 8,589 | 9,116 | 1,141 |
Totals 2006 | 86,053 | 7,069 | 7,403 | 291 |
Estimates from Surveys | Guesses | Area | ||||
---|---|---|---|---|---|---|
Cause of Change | Estimate | ± 95% CL | From | To | % Known and Possible | Total |
Repeat Survey | -10,320 | ±11,124 | 0 | 0 | 78.6 | 63,868 |
New Population | 0 | 0 | +713 | +713 | 5.6 | 4,563 |
Different Technique | +7 | ±99 | -145 | -145 | 4.1 | 3,370 |
Different Area | +20 | 0 | -3 | +36 | 0.0 | 33 |
New Guess | -182 | 0 | +519 | +559 | 8.2 | 6,662 |
Data Degraded | -17 | 0 | +17 | +17 | 0.0 | 0 |
Totals | -10,492 | ±11,124 | +1,101 | +1,180 | 96.6 | 78,839 |
Cause of Change | Definite | Probable | Possible | Speculative |
---|---|---|---|---|
Repeat Survey | -33,815 | +23,495 | +34,990 | 0 |
New Population | 0 | 0 | +527 | +186 |
Different Technique | -23 | +30 | +99 | -145 |
Different Area | +20 | 0 | -3 | +39 |
New Guess | -8 | 0 | -331 | +760 |
Totals | -33,826 | +23,525 | +35,282 | +840 |
Data Category | Known Range | Possible Range | Total Range |
---|---|---|---|
Aerial or Ground Total Counts | 819 | 0 | 819 |
Direct Sample Counts and Reliable Dung Counts | 65,375 | 127 | 65,502 |
Informed Guesses | 3,745 | 32 | 3,777 |
Other Guesses | 8,741 | 0 | 8,741 |
Unassessed Range | 1,533 | 857 | 2,389 |
Totals | 80,213 | 1,016 | 81,228 |
Cause of | Survey Details2 | Number of Elephants | Area | Map Location | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Input Zone | Change1 | Type | Reliab. | Year | Estimate | 95% C.L. | Source | PFS3 | (km²) | Lon. | Lat. |
+ Chegutu Safari Area | NG | O | E | 2014 | 150 | Dunham, 2015 | 2 | 445 | 29.6E | 17.9S | |
Greater Mapungubwe | |||||||||||
+ Tuli, Maramani, Sentinel, Nottingham | RS | AT | A | 2014 | 212 | Selier & Page, 2015 | 2 | 1,192 | 29.4E | 22.0S | |
Lower Zambezi Valley | |||||||||||
+ Chewore I and III | RS | AS | B | 2014 | 2,709 | 851 | Dunham et al., 2015c | 2 | 1,773 | 29.9E | 16.1S |
+ Chewore II | RS | AS | B | 2014 | 594 | 333 | Dunham et al., 2015c | 2 | 1,058 | 29.9E | 16.1S |
+ Chewore IV | RS | AS | B | 2014 | 0 | Dunham et al., 2015c | 3 | 472 | 29.9E | 16.1S | |
+ Doma Safari Area | RS | AS | B | 2014 | 153 | 194 | Dunham et al., 2015c | 2 | 991 | 29.9E | 16.1S |
+ Mavuradonha Wilderness Area | RS | AS | B | 2014 | 0 | Dunham et al., 2015c | 2 | 652 | 29.9E | 16.1S | |
+ Mukwiche Area | RS | AS | B | 2014 | 0 | Dunham et al., 2015c | 3 | 337 | 29.9E | 16.1S | |
+ Protea Farm | - | O | E | 2001 | 7 | Dunham & Mackie, 2002 | 4 | 14 | 29.6E | 16.5S | |
+ Rest of Zambezi valley | RS | AS | B | 2014 | 8,200 | 2,029 | Dunham et al., 2015c | 1 | 11,720 | 29.9E | 16.1S |
+ Mambali Communal Lands | - | AT | E | 2001 | 10 | Dunham & Mackie, 2002 | 2 | 327 | 28.4E | 21.5S | |
+ Mangwe Dam | DA | O | D | 2014 | 20 | 40* | Dunham, 2015 | 3 | 291 | 28.1E | 20.7S |
Northwest Matabeleland | |||||||||||
+ Fuller Forest Land | NP | O | D | 2014 | 308 | Dunham, 2015 | 3 | 10,000 | 25.9E | 18.1S | |
+ Gwaai, Bembesi, and Umguza Forest Lands | NP | O | D | 2014 | 165 | Dunham, 2015 | 2 | 1,442 | 28.0E | 19.3S | |
+ Gwampa/Lake Alice Forest Lands | NP | O | E | 2014 | 150 | Dunham, 2015 | 2 | 860 | 28.5E | 19.1S | |
+ Hwange National Park | RS | AS | B | 2014 | 45,846 | 6,244 | Dunham et al., 2015a | 1 | 15,168 | 26.4E | 18.8S |
+ Matabeleland Communal areas | RS | AS | B | 2014 | 2,201 | 3,062 | Dunham et al., 2015a | 2 | 3,075 | 26.4E | 18.8S |
+ Matetsi Safari Complex | RS | AS | B | 2014 | 4,843 | 2,968 | Dunham et al., 2015a | 1 | 4,384 | 26.4E | 18.8S |
+ Nakavango | NP | O | E | 2014 | 36 | Dunham, 2015 | 3 | 10,000 | 25.8E | 18.0S | |
+ Ngamo & Sikumi Forest Areas | RS | AS | B | 2014 | 1,101 | 993 | Dunham et al., 2015a | 2 | 2,332 | 26.4E | 18.8S |
+ Nyatana Wildlife Management Area | NG | O | E | 2014 | 30 | Dunham, 2015 | 2 | 651 | 32.5E | 16.7S | |
Sebungwe | |||||||||||
+ Binga Communal Lands | RS | AS | B | 2014 | 86 | 162 | Dunham et al., 2015b | 2 | 2,201 | 28.2E | 17.4S |
+ Chete Safari Area | RS | AS | B | 2014 | 278 | 222 | Dunham et al., 2015b | 2 | 1,242 | 28.2E | 17.4S |
+ Chirisa Safari Area | RS | AS | B | 2014 | 1,200 | 755 | Dunham et al., 2015b | 2 | 1,530 | 28.2E | 17.4S |
+ Chizarira National Park | RS | AS | B | 2014 | 747 | 767 | Dunham et al., 2015b | 2 | 2,096 | 28.2E | 17.4S |
+ Kariba Communal Areas | RS | AS | B | 2014 | 411 | 364 | Dunham et al., 2015b | 2 | 3,198 | 28.2E | 17.4S |
+ Kavira Forest Land | NG | O | E | 2014 | 70 | 30* | Dunham, 2015 | 2 | 287 | 27.0E | 18.1S |
+ Lusulu | RS | AS | B | 2014 | 0 | Dunham et al., 2015b | 2 | 537 | 28.2E | 17.4S | |
+ Matusadona National Park | RS | AS | B | 2014 | 669 | 251 | Dunham et al., 2015b | 2 | 1,366 | 28.2E | 17.4S |
+ North Gokwe Communal Lands | RS | AS | B | 2014 | 0 | Dunham et al., 2015b | 2 | 3,096 | 28.2E | 17.4S | |
+ Sijarira Forest Area | RS | AS | B | 2014 | 16 | 21 | Dunham et al., 2015b | 3 | 261 | 28.2E | 17.4S |
+ Shangani Ranch | NG | O | E | 2014 | 174 | Dunham, 2015 | 2 | 628 | 29.3E | 19.6S | |
Southeast Lowveld | |||||||||||
+ Bubiana Conservancy | NG | O | E | 2014 | 100 | Dunham, 2015 | 2 | 1,772 | 29.8E | 21.1S | |
+ Bubye Valley Conservancy | NG | O | E | 2014 | 500 | 100* | Dunham, 2015 | 1 | 2,895 | 30.1E | 21.5S |
+ Chiredzi River Conservancy | DT | O | E | 2014 | 55 | Dunham, 2015 | 2 | 895 | 31.6E | 20.8S | |
+ Gonarezhou National Park | RS | AS | B | 2014 | 11,120 | 2,709 | Dunham & van der Westhuizen, 2015 | 1 | 4,941 | 31.9E | 21.5S |
+ Mahenye Ward | RS | AS | B | 2014 | 332 | 519 | Dunham & van der Westhuizen, 2015 | 3 | 221 | 31.9E | 21.5S |
+ Malapati Safari Area | RS | AS | B | 2014 | 0 | Dunham & van der Westhuizen, 2015 | 3 | 177 | 31.9E | 21.5S | |
+ Malilangwe Conservancy | RS | AT | A | 2013 | 272 | Clegg, 2013 | 3 | 425 | 31.9E | 21.1S | |
+ Matibi II Communal Lands | - | AS | E | 1996 | 0 | Davies et al., 1996 | 3 | 400 | 31.7E | 21.5S | |
+ Nuanetsi Ranch | NP | O | D | 2014 | 54 | Dunham, 2015 | 2 | 10,000 | 30.8E | 21.6S | |
+ Save Valley Conservancy | RS | AS | B | 2014 | 1,585 | 1,295 | Dunham & van der Westhuizen, 2015 | 2 | 3,496 | 32.1E | 20.4S |
+ Sengwe Communal Land | DT | AS | B | 2013 | 35 | 99 | Dunham et al., 2013 | 2 | 2,488 | 31.8E | 21.6S |
* Range of informed guess
1Key to Causes of Change (only tracked since 2007): DA: Different Area; DD: Data Degraded; DT: Different Technique; NA: New Analysis; NG: New Guess; NP: New population; PL: Population Lost; RS: Repeat Survey (RS ́ denotes a repeat survey that is not statistically comparable for reasons such as different season); –––: No Change
2Key to Survey Types: AC: Aerial Count, not specified; AS: Aerial Sample Count; AT: Aerial Total Count; DC: Dung Count; EX: Extrapolation from GIS; GD: Genetic Dung Count; GS: Ground Sample Count; GT: Ground Total Count; IG: Informed Guess; IR: Individual Registration; OG: Other Guess. Survey Type is followed by an indicator of survey quality, ranked from 1 to 3 (best to worst). Survey Reliability is keyed A-E (best to worst) as outlined in this table.
3PFS: 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.africanelephantdatabase.org/reliability. As a result, totals do not necessarily match the simple sum of the entries within a given category.