Gabon, 2007

1. Reports
2. 2007
3. Africa
4. Central Africa
5. Gabon

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

2007 Summary Totals for Gabon

Data Category	Definite	Probable	Possible	Speculative
Direct Sample Counts and Reliable Dung Counts	1,523	827	827	0
Other Dung Counts	0	22,630	7,965	0
Informed Guesses	0	0	19,119	969
Other Guesses	0	0	0	16,777
Totals 2006	1,523	23,457	27,911	17,746

Interpretation of Changes in Estimates from Previous Report

Cause of Change	Definite	Probable	Possible	Speculative
Different Technique	0	+22,630	+15,878	0
Different Area	+1,523	-7,305	-2,679	0
New Analysis	0	0	0	-40,563
Totals	+1,523	+15,325	+13,199	-40,563

Area of Range Covered by Each Data Category (km²)

Data Category	Known Range	Possible Range	Total Range
Direct Sample Counts and Reliable Dung Counts	4,640	0	4,640
Other Dung Counts	13,843	0	13,843
Informed Guesses	17,278	0	17,278
Other Guesses	169,003	0	169,003
Unassessed Range	14,222	0	14,222
Totals	218,985	0	218,985

Gabon : 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.
Djouah - Bélinga	DT	IG3	D	2002	4,035		Lahm & Barnes, quest. reply, 2006	2	4,339	13.6E	1.2N
Gamba Reserve Complex	-	IG3	D	1999	11,205	969*	Thibault et al., 2001	2	10,485	10.1E	2.4S
Ivindo National Park & western buffer zone	DT	DC2	C	2005	1,216	572	F.G. Maisels, pers. comm., 2006a	3	3,475	12.6E	0.1N
Lopé National Park	DA	DC2	B	2005	2,350	827	Maisels et al., 2006	2	4,486	11.5E	0.6S
Minkébé National Park	DT	DC2	C	2004	21,070	7,942	Blake, 2005	2	7,338	12.7E	1.8N
Monts de Cristal	DT	IG3	D	2001	1,396		Lahm & Barnes, quest. reply, 2006	3	2,083	10.3E	0.7N
Mwagne	DT	IG3	D	2001	2,483		Lahm & Barnes, quest. reply, 2006	3	473	13.8E	0.5N
Pongara National Park	DT	DC2	C	2006	344	152	Latour, 2006	3	380	9.4E	0.1N
Rest of Gabon Forest Range	NA	DC2	E	1988	16,777		Barnes et al., 1995	1	169,018	11.7E	0.7S

* 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.