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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The birth rate of the present population was 13.6%, compared to one of 24.1 % reported for the period 1964-1966 by Goddard (1967a). However, during my second visit to the area, a year later (December 1983), five more calves had been born, thus raising the birth rate to 24.2%, a value very close to that recorded by Goddard. The intercalving interval of two known females in the area was observed to be 27-28 months. Goddard (1967a) reported an intercalving interval of 27 months. By September 1982, the mortality rate was 8% and the natality rate (number of births per year as a percentage of all rhinos) was 6%, showing a decline in the population of 2%. However, by December 1983, the natality rate changed to 10.7% resulting in a population increase of 2.7%.
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