Elephant Database
African Elephant Specialist Group

Dung Count (Line Transects) Stratum/Block

Gabon
Phenotype: Forest (based on genetic evidence gathered on-site)
Data contributed by aed@solertium.com, last updated 21/10/2022
Report restricted by data provider
380 km²
No strata
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Pongara National Park

Internal name:
Stratum/block area (km²): 378
Population estimate: 344
Variance: 6034.1826171875
Standard error: 77.6800003051758
Value of t used to calculate 95% confidence interval:
Degrees of freedom:
95% confidence interval: 152.252807617188
95% lower confidence limit: 220
95% upper confidence limit: 538
Check if no estimate of precision available: false
Asymmetric lower confidence interval: 220
Asymmetric upper confidence interval: 538
Number of transects covered: 40
Total length of transects covered (in km): 36.25
Effective strip width: 2.55
Number of observations (encounters): 167
How were distances to observations estimated?: Using instruments
Number of elephants seen:
Number of dungpile on which the decay estimate is based: 1282
Was dung decay rate measured on site, and if so, how?: Decay rate NOT measured on site
Dung decay estimate used (days): 56.0
Site where decay rate was measured: Lope National park -three rates were used in the report- 44, 56 and 70. However if we use 158 days as Conkouati which is the same climate, (Vanleeuwe & probert 2014) , we get 157 elephants (in narrative too)
Date (year) in which decay rate was measured: 1992
Dung decay rate - bibliographical reference: White, L.J.T. (1995). Factors affecting the duration of elephant dung piles in rain forest in the Lopé reserve, Gabon. African Journal of Ecology, 33 : 142-150.
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Check if no estimate of precision available: true
Was defecation rate measured on-site?: false
Estimate of defecation rate used (days): 18.06
Site where the defecation rate was measured:
Defecation rate - bibliographical reference: Hedges & Lawson, 2006
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Check if no estimate of precision available: true
Estimate of dung density: 900
Variance:
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95% upper confidence limit:
Asymmetric upper confidence interval: 1406
Asymmetric lower confidence interval: 576
Check if no estimate of precision available: false
Dung encounter rate: 4.95
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