Nigeria, 2007

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

2007 Summary Totals for Nigeria

Data Category	Definite	Possible	Speculative
Aerial or Ground Total Counts	348	0	0
Informed Guesses	0	105	100
Other Guesses	0	0	275
Totals 2006	348	105	375

Interpretation of Changes in Estimates from Previous Report

Cause of Change	Definite	Possible	Speculative
Repeat Survey	+20	0	0
Different Technique	-150	0	-100
Data Degraded	0	-235	+175
Totals	-130	-235	+75

Area of Range Covered by Each Data Category (km²)

Data Category	Known Range	Possible Range	Total Range
Aerial or Ground Total Counts	495	1,570	2,065
Informed Guesses	1,801	653	2,454
Other Guesses	3,821	142	3,964
Unassessed Range	7,030	7,456	14,486
Totals	13,147	9,821	22,968

Nigeria : 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.
Andoni Island	-	IG3	D	2002	6	4*	Mshelbwala et al., 2002	3	215	7.5E	4.5N
Chad Basin (Chingurmi-Duguma) National Park Sector	DD	IG3	E	1994	100		Mshelbwala, 1998	2	2,160	14.4E	11.7N
Cross River (Okwangwo) National Park	-	DC3	D	1998	74	56*	Obot et al., 1998	2	239	9.2E	6.3N
Gashaka-Gumti National Park	-	IG3	D	2002	20	30*	R. Barnwell, pers. comm., 2002	1	5,860	11.7E	7.5N
Kambari	-	IG3	D	1998	5	10*	Gawaisa, quest. reply, 1998	2	2,000	10.6E	8.8N
Kwiambana Game Reserve	DD	IG3	E	1993	80	40*	Hurst, quest. reply, 1994	2	1,715	6.6E	11.3N
Marguba Forest Reserve	DT	AT3	A	2006	0		Omondi et al., 2006a	1	710	12.7E	11.5N
Okomu Game Sanctuary	-	OG3	E	1991	40		NRCC, 1991	2	1,082	5.1E	6.3N
Omo Forest Reserve	DD	IG3	E	1994	30	20*	Mshelbwala, 1998	2	1,300	3.6E	6.8N
Sambisa	DT	AT3	A	2006	0		Omondi et al., 2006a	1	647	13.4E	11.3N
Taylor Creek	DD	IG3	E	1993	25		Thouless, 1993	3	145	6.4E	5.2N
Yankari National Park	RS	AT3	A	2006	348		Omondi et al., 2006b	2	3,224	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.