Elephant Database
African Elephant Specialist Group

Provisional African Elephant Population Estimates: update to 31 Dec 2013

All Years for Congo: 20132007200219981995

Summary Totals for Congo

Data Category Definite Probable Possible Speculative
Direct Sample Counts and Reliable Dung Counts4,2981,0341,0340
Other Dung Counts024,4016,9780
Totals 20134,29825,4358,0120
Totals 200640213,9156,5900

Area of Range Covered by Each Data Category (km²)

Data CategoryKnown RangePossible RangeTotal Range
Direct Sample Counts and Reliable Dung Counts23,6172,91726,535
Other Dung Counts27,7432,15629,899
Unassessed Range37,36557,13894,503

Congo: Elephant Estimates

Cause ofSurvey Details2 Number of Elephants Area Map Location
Input ZoneChange1TypeReliab.YearEstimate95% C.L. SourcePFS3 (km²) Lon. Lat.
+ Bailly Swamps - NorthNPDCB2011827 656Maisels et al., 201224,210 16.8E 1.8N
NPDCB2011827 656Maisels et al., 20124,210 16.8E 1.8N
+ Batanga EcosystemNPDCB2012104 153Iyenguet et al., 201221,029 17.6E 0.6N
NPDCB2012104 153Iyenguet et al., 20121,029 17.6E 0.6N
+ Conkouati-Douli National ParkRSDCB2013947 180Vanleeuwe, 201423,850 11.5E 3.9S
RSDCB2013947 180Vanleeuwe, 20143,850 11.5E 3.9S
+ Lac Télé Community Reserve DADCB2011296428Maisels et al., 201226,054 16.8E 1.8N
DADCB2011296 428Maisels et al., 20123,299 16.8E 1.8N
DADCB20110Maisels et al., 20122,755 16.8E 1.8N
+ Loundougou logging concession - swampsNPDCB2011279 204Maisels et al., 201222,515 16.8E 1.8N
NPDCB2011279 204Maisels et al., 20122,515 16.8E 1.8N
+ Messok-Dja Forest AreaNPDCB2013346 202Mantsila, 201321,228 14.6E 2.0N
NPDCB2013346 202Mantsila, 20131,228 14.6E 2.0N
+ Ngombe-Pikounda-Ntokou areaNPDCC200715,109 6,620Malonga, 2007117,753 15.5E 0.4N
NPDCC200715,109 6,620Malonga, 200717,753 15.5E 0.4N
+ Nouabalé Ndoki National Park and adjacent areaDADCB20112,533565Maisels et al., 201217,187 16.8E 1.8N
DADCB2011143 117Maisels et al., 20122,210 16.8E 1.8N
DADCB2011865 378Maisels et al., 20121,266 16.8E 1.8N
DADCB20111,459 391Maisels et al., 20122,696 16.8E 1.8N
DADCB201166 98Maisels et al., 20121,015 16.8E 1.8N
+ Odzala Kokoua National Park RSDCC20129,2922,206Maisels et al., 2013113,525 15.0E 0.9N
RSDCC20123,395 1,092Maisels et al., 20137,323 15.0E 0.9N
RSDCC20125,897 1,917Maisels et al., 20136,202 15.0E 0.9N

* 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.

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