Table 1. Details of the observations made at the five study sites.
Total group size and the age sex classes include the range of number of individuals during the course of the study. Not all groups were observed for the entire duration of the study period for the sites with more than one group.
| Study Site | Subspecies | Annual Rainfall (mm) | Geographic Coordinates | Altitude (for study groups) | Number of Observers | Days of Observation | Observation Period | Number of Groups | Group Name | Total Size (range during study period) | # Silverback | # Blackback | # Adult Female | # Juvenile & Subadult | # Infant |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bwindi | G. bberingei | 1180 | 1° 0' S 29° 40' E | 2100–2500 m | 2 | 957 | 1998–2011 | 1 | Kyagurilo | 9–21 | 1–4 | 0–4 | 5–7 | 0–6 | 0–7 |
| Karisoke | G. b. beringei | 2050 | 1° 50' S 29° 30' E | 2700–4000 m | 2 | 852 | 2006–2014 | 11 | BEE | 21–27 | 4–7 | 0–2 | 7–10 | 7–13 | + |
| INS | 2–8 | 1 | 0 | 1–4 | 0–4 | + | |||||||||
| ISA | 4–17 | 1–2 | 0–1 | 2–8 | 0–8 | + | |||||||||
| KUY | 8–16 | 2–3 | 0–2 | 2–6 | 2–11 | + | |||||||||
| NTA | 5–19 | 2–4 | 0–2 | 1–7 | 0–9 | + | |||||||||
| PAB | 29–65 | 3–8 | 1–10 | 7–20 | 11–35 | + | |||||||||
| SHI | 23–29 | 4–7 | 1–2 | 6–11 | 7–14 | + | |||||||||
| TIT | 4–14 | 1–4 | 0–3 | 1–4 | 0–8 | + | |||||||||
| UGE | 6–23 | 1–3 | 0 | 1–9 | 1–14 | + | |||||||||
| URU | 4–7 | 1 | 0 | 2–3 | 1–4 | + | |||||||||
| BWE | 2–12 | 1 | 0 | 1–7 | 0–8 | + | |||||||||
| Bai Hokou | G. g. gorilla | 1600–1800 | 2° 50' N 16° 28' E | 340–615 m | 3 | 2348 | 2004–2014 | 3 | Munye | 3 | 1 | 0 | 1 | 1 | 0 |
| Makumba | 9–13 | 1 | 1 | 2–4 | 3–7 | 5 | |||||||||
| Mayele | 14–16 | 1 | 0 | 2–4 | 8 | 4 | |||||||||
| Mondika | G. g. gorilla | 1600–1800 | 2° 21' N 16° 16' E | <400m | 3 | 815* (and 47 months) | 2003–2010 | 3 | Kingo | 9–13 | 1 | 0 | 4–6 | 1–2 | 3–5 |
| Muya | 3 | 1 | 0 | 2 | 0 | 0 | |||||||||
| Buka | 13 | 1 | 1 | 4 | 3–4 | 3 | |||||||||
| Moukalaba | G. g. gorilla | 1300–1800 | 2° 3' S 10° 57' E | <200 m | 3 | 430 | 2007–2015 | 1 | Gentil | 19–23 | 1 | 0–5 | 5–9 | 5–11 | 3–7 |
* another researcher made observations at Mondika for a total of 47 months (but exact number of days is not known). + for the Karisoke study groups, infants are combined in the juvenile and subadult age category.