Elephant Database
African Elephant Specialist Group

Chad, 2007

All Years for Chad: 201620132007200219981995

2007 Summary Totals for Chad

Data Category Definite Probable Possible Speculative
Aerial or Ground Total Counts3,885000
Informed Guesses002,000550
Totals 20063,88502,000550

Interpretation of Changes in Estimates from Previous Report

Cause of Change Definite Probable Possible Speculative
Repeat Survey+1,896000
Totals+1,896000

Area of Range Covered by Each Data Category (km²)

Data CategoryKnown RangePossible RangeTotal Range
Aerial or Ground Total Counts3,15103,151
Informed Guesses35,0481235,061
Unassessed Range63,04548,187111,232
Totals101,24448,200149,443

Chad : Elephant Estimates

Cause ofSurvey Details2 Number of Elephants Area Map Location
Input ZoneChange1TypeReliab.YearEstimate95% C.L. SourcePFS3 (km²) Lon. Lat.
Dembo Area-IG3D2002600 100*Malachie & Lassou, 200222,409 18.0E 8.2N
Gagal-Yapala Area-IG3D2002400 100*Malachie & Lassou, 200224,640 14.9E 9.1N
Koloudia-Doumdoum Area-IG3D200250 50*Malachie & Lassou, 200222,180 15.3E 13.4N
Lac Fitri Area-IG3D2002200 100*Malachie & Lassou, 2002211,670 17.6E 12.9N
Larmanaye Area-IG3D2002100 50*Malachie & Lassou, 200222,180 15.5E 8.1N
Massenya-Mandjafa Area-IG3D2002150 50*Malachie & Lassou, 2002210,864 16.3E 11.3N
Siniaka-Minia Faunal Reserve-IG3D2002500 100*Malachie & Lassou, 200224,740 18.2E 10.4N
Zakouma National ParkRSAT2A20053,885Malachie et al., 200532,987 19.7E 10.8N

* 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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