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126<br />
Table 3.<br />
Summary of crocodile densilies in the Selous Game Reserve as estimated<br />
by aerial survey.<br />
Graham/BeU<br />
1963<br />
Iringa Region - Rutrhtr National Park<br />
Ruaha River (Fiqwe 4)<br />
Hutton/Katalihwa<br />
19EE<br />
Games/Severre<br />
1989<br />
Gam€s/Severre<br />
1990<br />
Upper Runji 1.95 - 3.51 0.98 3.15 2.89<br />
Lower Rufiji 6.75 11.83<br />
Rufiji Lakes 3.35 8.46<br />
Ruaha 1.56 l.'7'l t.57<br />
Kilombero 0.28 2.86<br />
Upper<br />
Luwego<br />
Lowet<br />
Luwego<br />
0.33 1.64<br />
This river can be divided into two strata. Upstream ofthe park headquarters at Msemhe (Figure<br />
4) the river is moderately wide tlowing over rooks. There were occasional deep pools.<br />
Downstream of Msembe it is a very wide and sandy meandering river. The water is very<br />
shallow and there are few pools. <strong>Crocodile</strong> densities wete medium in the upstream section<br />
(4.67 crocodiles/km) and low in the downstream section (0 15 crocodiles/km).<br />
Most of the crocodiles were congregated in large pools upstream from Msembe (31.72<br />
crocodiles/km) and once past the Foxtreks camp (Figure 4) densities were low (0 86<br />
crocodiles/km). There was a noticeable decrease once the park boundary was reached.<br />
Flgure 4: Upper Ru:rhr crocodile survey - 1990
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