 Reference Base  Black rhinoceros (Diceros bicornis (L.)): population size... |
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Kiwia, H.D., 1989. Black rhinoceros (Diceros bicornis (L.)): population size and structure in Ngorongoro Crater, Tanzania. African Journal of Ecology 27: 1-6, fig.1, tables 1-2
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| Location: |
Africa - Eastern Africa - Tanzania |
| Subject: |
Ecology - Population |
| Species: |
Black Rhino |
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A total of twenty-five rhinos were counted in the area during the study (Table 1). Of the twenty-five rhinos, fifteen were permanent residents of the Crater floor and the remaining ten were temporary visitors. The sex ratio (male:female) for rhinos of all age classes combined was 1: 1.2 and for adults 1: 1.8 (Table 2). Three calves (two males and one female) were born in the area, whereas four adults (two males and two females) were killed by poachers (three were shot and one speared) leaving twenty-one individuals by the end of the field work.
Table 2. Sex and age ratios of Black Rhinoceros inTanzania and Kenya (all individuals known by. observer)
Sample Sex ratio Age ratio Source of
Location size Male:Female Cow:Calf information
Ngorongoro Crater 24 1:1.2 100:45 This study
105 1: 1.1 100:72 Goddard. (1967a)
Serengeti Plains 63 1:1.0 100:79 Frame, ( 1980)
Olduvai Gorge 74 1:0.8 100:79 Goddard. (1 967a)
Masai Mara 97 1:0.8 - Mukinya, (1973)
Tsavo medium density 52 1:1.2 - Goddard. (1970)
Tsavo high density 124 1:1.0 100:79* Goddard, (1970)
Tsavo high density 89 1 0.8 - Goddard. (1970)
Tsavo high density 119 1:0.9 - Goddard, (1970)
Tsavo high density 77 1:1.0 - Goddard. (1970)
Note: All unsexed calves not included. *all Goddard's data combined.
The sex ratio also does not differ significantly from those observed in ten other studies (X2 =3.13, P>0-05).
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