An Analysis of the Records of a South African Ringing Station

Life Expectancy of the Cape Sparrow

“…However, juvenile mortality rates, adult mortality rates and adult life expectancy calculated in this paper are similar to the results obtained by Rowan (1964Rowan ( , 1966 for the Cape Sparrow elsewhere in South Africa. Acocks (1953) as Dry Cymbopogon-Themeda Veld.…”

“…Problems in using these data have been given by Rowan (1964) for the Cape Sparrow, and by Franks (1975) for ringing data for small passerines in general. However, juvenile mortality rates, adult mortality rates and adult life expectancy calculated in this paper are similar to the results obtained by Rowan (1964Rowan ( , 1966 for the Cape Sparrow elsewhere in South Africa.…”

SOME OBSERVATIONS ON REPRODUCTION AND MORTALITY IN THE CAPE SPARROW PASSER MELANURUS

“…For further estimates, I have used the last figure, which is likely to be too low, rather than too high, and have assumed an equal sex ratio-an assumption which is supported by ringing results (Rowan 1964). On this basis, every 100 adults (50 pairs) present during the breeding season will lay 100 clutches.…”

“…The evidence from the Transvaal is owed to Reed, who has been ringing and recapturing Mossies over a privately-owned area of 35 acres ever since 1954. Conventional life tables, constructed from his records, indicate that 52% of his ringed males survive from the beginning of one breeding season to the next (Rowan 1964). For the south-west Cape, I have records of a much smaller number of ringed birds, trapped in a smaller (10-acre) area in suburban Cape Town since early 1959.…”

The Birds of the De Hoop Vlei Region, Bredasdorp, and the Effect, of the 1957 Inundation Over a 10-Year Period (1957–1966) on the Distribution of Species, Bird Numbers and Breeding

“…crakes and rails are either absent or poorly represented and the bias in terms of numbers is heavily in favour of the geese, duck, grebes and coot. Amongst the duck as would be expected (Siegfried, 1965;Rowan, 1964) conditions favour the Shoveller and Yellow-bill and they predominate during most of the year, though Shelduck, Pochard and Maccoa are not uncommon, showing quite definite seasonal variations. After the 1957 inundation the MV also shared the increased numbers observed on IA of Cape Teal and Shelduck, at that time common species (Brand, 1961).…”