Table 1.

Highest posterior probability values and, in brackets, 95% HPD intervals, for the parameters estimated using ima2. Results are listed for each of the six independent runs performed on each pairwise population analysis. Values in bold are the arithmetic means (±s.d.) calculated over the six runs. N_e denotes the effective size of a population and ‘Eastern’ indicates the eastern lowland gorilla population.

pairwise analysis	divergence time (t0) in years	current Ne, pop1	current Ne, pop2	ancestral Ne
Virunga (pop1)–Bwindi (pop2)	4740 [1260–13 980]	369 [131–681]	456 [169–831]	4419 [2169–8544]
	5580 [1860–13 980]	369 [156–669]	481 [206–831]	4319 [2156–8506]
	4980 [1500–13 980]	344 [131–656]	406 [181–831]	4169 [2144–8356]
	5220 [1740–13 860]	344 [156–681]	456 [194–819]	4094 [2094–8331]
	6060 [1860–13 980]	356 [156–669]	431 [194–844]	4206 [2119–8594]
	4980 [ 1740–14 580]	331 [144–681]	469 [194–844]	4256 [2131–8356]
	5260 (±484)	352 (±15)	450 (±27)	4244 (±115)
Virunga (pop1)–Eastern (pop2)	9420 [2460–89 580]	499 [219–919]	1496 [761–2861]	3386 [884–7481]
	11 220 [3300–96 540]	551 [254–954]	1601 [814–2861]	3351 [761–7866]
	10 980 [2820–119 820]	551 [236–954]	1584 [761–2984]	3351 [359–7149]
	10 980 [2580–118 260]	534 [236–919]	1496 [726–2844]	3404 [971–7481]
	11 460 [2700–112 020]	516 [236–936]	1496 [726–2826]	3386 [779–7919]
	11 340 [2940–119 940]	551 [236–936]	1444 [779–2861]	3456 [604–7481]
	10 900 (±750)	534 (±22)	1520 (±60)	3389 (±39)
Bwindi (pop1)–Eastern (pop2)	9540 [1980–25 860]	551 [254–1041]	1461 [621–2669]	4244 [2091–8479]
	8580 [2580–23 820]	569 [271–1024]	1444 [516–2599]	4279 [2021–8339]
	8700 [2340–24 540]	604 [236–1024]	1286 [586–2581]	4349 [2074–8689]
	8100 [2220–28 020]	604 [254–1059]	1339 [621–2739]	4261 [1969–8636]
	9420 [3300–27 300]	551 [289–1059]	1461 [709–2651]	4209 [2021–8111]
	9300 [2340–25 020]	604 [254–1041]	1321 [551–2651]	4366 [2021–8321]
	8940 (±568)	580 (±26)	1385 (±79)	4285 (±61)