Elephant Database
African Elephant Specialist Group

Provisional African Elephant Population Estimates: update to 31 Dec 2013

All Years for Angola: 201620132007200219981995

Summary Totals for Angola

Estimates from SurveysGuesses% Known and
Possible Range
Area (km2)
Survey categoryEstimate± 95% CLFromTo
Aerial Sample Counts1,5838013.210,496
Degraded Data1461460.1429
Totals 20151,583800146146  
Totals 20061,619800110110  
Assessed Range3.410,926
Unassessed Range96.6312,344
Total Range100323,270

Summary Totals for Angola

Data Category Definite Probable Possible Speculative
Direct Sample Counts and Reliable Dung Counts7828018010
Other Guesses3600110
Totals 2013818801801110
Totals 200681880185160

Interpretation of Changes in Estimates from Previous Report

 Estimates from SurveysGuessesArea
Cause of Change Estimate ± 95% CL From To% Known and PossibleTotal
Data Degraded-360+36+360.1429

Interpretation of Changes in Estimates from Previous Report

Cause of Change Definite Probable Possible Speculative
Data Degraded00-50+50

Interpretation of Changes in Estimates from Previous Report (2007 scaling)

Cause of Change Definite Probable Possible Speculative
Data Degraded00-50+50

Area of Range Covered by Each Data Category (km²)

Data CategoryKnown RangePossible RangeTotal Range
Direct Sample Counts and Reliable Dung Counts10,496010,496
Other Guesses41019429
Unassessed Range76,769235,576312,344

Angola: Elephant Estimates

Cause ofSurvey Details2 Number of Elephants Area Map Location
Input ZoneChange1TypeReliab.YearEstimate95% C.L. SourcePFS3 (km²) Lon. Lat.
+ Bongola Area-OE199260Anstey, 199321,505 17.6E 17.3S
-OE199260Anstey, 19931,505 17.6E 17.3S
+ Cáua CampDDIRE200236Vaz Pinto, pers. comm., 200339,500 13.3E 9.3S
DDIRE200236Vaz Pinto, pers. comm., 20039,500 13.3E 9.3S
+ Luiana East Reserve-ASB20051,583 801Chase & Griffin, 2005b24,032 22.8E 17.4S
-ASB20051,583 801Chase & Griffin, 2005b4,032 22.8E 17.4S
+ Luiana West Reserve-ASB20050Chase & Griffin, 2005b24,368 22.3E 17.4S
-ASB20050Chase & Griffin, 2005b4,368 22.3E 17.4S
+ Quiçama National ParkDDOE200250Vaz Pinto, pers. comm., 200329,500 13.6E 9.8S
DDOE200250Vaz Pinto, pers. comm., 20039,500 13.6E 9.8S

* 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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