Chad, 2007

All Years for Chad: 2016 — 2013 — 2007 — 2002 — 1998 — 1995

2007 Summary Totals for Chad

Data Category	Definite	Possible	Speculative
Aerial or Ground Total Counts	3,885	0	0
Informed Guesses	0	2,000	550
Totals 2006	3,885	2,000	550

Interpretation of Changes in Estimates from Previous Report

Cause of Change	Definite	Probable	Possible	Speculative
Repeat Survey	+1,896	0	0	0
Totals	+1,896	0	0	0

Area of Range Covered by Each Data Category (km²)

Data Category	Known Range	Possible Range	Total Range
Aerial or Ground Total Counts	3,151	0	3,151
Informed Guesses	35,048	12	35,061
Unassessed Range	63,045	48,187	111,232
Totals	101,244	48,200	149,443

Chad : Elephant Estimates

	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.
Dembo Area	-	IG3	D	2002	600	100*	Malachie & Lassou, 2002	2	2,409	18.0E	8.2N
Gagal-Yapala Area	-	IG3	D	2002	400	100*	Malachie & Lassou, 2002	2	4,640	14.9E	9.1N
Koloudia-Doumdoum Area	-	IG3	D	2002	50	50*	Malachie & Lassou, 2002	2	2,180	15.3E	13.4N
Lac Fitri Area	-	IG3	D	2002	200	100*	Malachie & Lassou, 2002	2	11,670	17.6E	12.9N
Larmanaye Area	-	IG3	D	2002	100	50*	Malachie & Lassou, 2002	2	2,180	15.5E	8.1N
Massenya-Mandjafa Area	-	IG3	D	2002	150	50*	Malachie & Lassou, 2002	2	10,864	16.3E	11.3N
Siniaka-Minia Faunal Reserve	-	IG3	D	2002	500	100*	Malachie & Lassou, 2002	2	4,740	18.2E	10.4N
Zakouma National Park	RS	AT2	A	2005	3,885		Malachie et al., 2005	3	2,987	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.