Table 2 

Estimates of parameters of the demographic model applied to Cross River and western lowland gorillas 

Prior distribution 
min 
max 
Posterior mode 
HDI 50^{b} 
HDI 90^{b} 
HDI 95^{b} 



2Nm 
Loguniform 
1 
15.85 
9.55 
[4.57, 13.8] 
[1.58, 15.84] 
[1.32, 15.85] 
N_{crossriver_old}/N_{crossriver_now}) 
Loguniform 
1 
100 
61.7 
[33.1, 93.3] 
[10, 100] 
[4.2, 100] 
N_{crossriver_now} 
N(200, 100) ^{a} 
68 
300 
271 
[223, 292] 
[146, 300] 
[122, 300] 
N_{ancestral} 
Uniform 
500 
25,000 
2,547 
[1,383, 4,032] 
[500, 6,681] 
[500, 7,684] 
N_{western} 
N(24,000, 5000) ^{a} 
10,000 
30,000 
22,376 
[18,765, 25,319] 
[14,217, 28,930] 
[12,879, 29,532] 
T_{divergence} 
Loguniform 
10 
3,162 
891 
[269, 1,738] 
[60.3, 3,090] 
[38, 3.162] 
T_{bottleneck} 
Loguniform 
10 
316 
16 
[33.1, 93.3] 
[10, 97.7] 
[10, 141] 
T_{migration} 
Loguniform 
10 
3,162 
21 
[11.7, 60.3] 
[10, 446.7] 
[10, 812] 


N_{crossriver_now}, N_{ancestral}, N_{western }represent the effective population sizes of Cross River, ancestral and western lowland gorillas respectively. Timings in generations were estimated on the log_{10 }scale and indicate the divergence (T_{divergence}), the onset of the bottleneck (T_{bottlneck}) and the cessation of migration (T_{migration}). The number of diploid individuals exchanged between the populations was also estimated on the log_{10 }scale as 2 Nm. For parameters estimated on the log_{10 }scale we chose uniform priors on the same scale. ^{a }Corresponds to a normal distribution of the form N(μ, σ) truncated at [min, max] ^{b }The high posterior density interval HDI is chosen as the smallest continuous interval spanning 50% of the posterior surface. The other HDI are chosen accordingly. 

Thalmann et al. BMC Evolutionary Biology 2011 11:85 doi:10.1186/147121481185 