Elephant Database
African Elephant Specialist Group

Nigeria, 2007

All Years for Nigeria: 201620132007200219981995

2007 Summary Totals for Nigeria

Data Category Definite Probable Possible Speculative
Aerial or Ground Total Counts348000
Informed Guesses00105100
Other Guesses000275
Totals 20063480105375

Interpretation of Changes in Estimates from Previous Report

Cause of Change Definite Probable Possible Speculative
Repeat Survey+20000
Different Technique-15000-100
Data Degraded00-235+175
Totals-1300-235+75

Area of Range Covered by Each Data Category (km²)

Data CategoryKnown RangePossible RangeTotal Range
Aerial or Ground Total Counts4951,5702,065
Informed Guesses1,8016532,454
Other Guesses3,8211423,964
Unassessed Range7,0307,45614,486
Totals13,1479,82122,968

Nigeria : Elephant Estimates

Cause ofSurvey Details2 Number of Elephants Area Map Location
Input ZoneChange1TypeReliab.YearEstimate95% C.L. SourcePFS3 (km²) Lon. Lat.
Andoni Island-IG3D20026 4*Mshelbwala et al., 20023215 7.5E 4.5N
Chad Basin (Chingurmi-Duguma) National Park SectorDDIG3E1994100Mshelbwala, 199822,160 14.4E 11.7N
Cross River (Okwangwo) National Park-DC3D199874 56*Obot et al., 19982239 9.2E 6.3N
Gashaka-Gumti National Park-IG3D200220 30*R. Barnwell, pers. comm., 200215,860 11.7E 7.5N
Kambari-IG3D19985 10*Gawaisa, quest. reply, 199822,000 10.6E 8.8N
Kwiambana Game ReserveDDIG3E199380 40*Hurst, quest. reply, 199421,715 6.6E 11.3N
Marguba Forest ReserveDTAT3A20060Omondi et al., 2006a1710 12.7E 11.5N
Okomu Game Sanctuary-OG3E199140NRCC, 199121,082 5.1E 6.3N
Omo Forest ReserveDDIG3E199430 20*Mshelbwala, 199821,300 3.6E 6.8N
SambisaDTAT3A20060Omondi et al., 2006a1647 13.4E 11.3N
Taylor CreekDDIG3E199325Thouless, 19933145 6.4E 5.2N
Yankari National ParkRSAT3A2006348Omondi et al., 2006b23,224 10.5E 9.8N

* 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.

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