Zobrazeno 1 - 10
of 23
pro vyhledávání: '"RM Randall"'
Autor:
Minke Witteveen, Keith H. B. Harrison, Bruce M. Dyer, RM Randall, PA Whittington, Lauren J. Waller, Azwianewi B. Makhado, Mark Brown, Leshia Upfold, A. Paul Martin, Peter G. Ryan, Johan Huisamen, Robert J. M. Crawford
Publikováno v:
Waterbirds. 39:99-113
South Africa's population of Kelp Gulls (Larus dominicanus vetula) numbered about 10,000 pairs during 1976/1977–1980/1981, increased to 21,000 pairs from 2000/2001–2004/2005 and then decreased to 17,500 pairs from 2009/2010–2013/2014. The incre
Autor:
Bruce M. Dyer, Colleen T. Downs, PA Whittington, Meyrick B. Bowker, C Fox, WH Oosthuizen, RM Randall, David G. Allan, Peter G. Ryan, J Visagie, Azwianewi B. Makhado, S Bachoo, Jane Turpie, R Fox, AP Martin, L Upfold, Rjm Crawford, Lauren Waller, J Huisamen, Ricky H. Taylor
Publikováno v:
African Journal of Marine Science; Vol 35, No 4 (2013)
White-breasted cormorants Phalacrocorax [carbo] lucidus breed around South Africa’s coast and at inland localities. Along the coasts of the Northern, Western and Eastern Cape provinces, numbers breeding were similar during the periods 1977–1981 (
Autor:
Deon Geldenhuys, J Huisamen, Lauren Waller, Azwianewi B. Makhado, Peter G. Ryan, PA Whittington, MK Smith, RM Randall, L Upfold, Rjm Crawford, J Visagie, R Fox, Bruce M. Dyer, Timothée R. Cook, CG Wilke, C McGeorge
Publikováno v:
African Journal of Marine Science; Vol 38, No 3 (2016); 373-383
Numbers of Cape cormorants Phalacrocorax capensis breeding in South Africa decreased by nearly 50% from approximately 107 000 pairs in 1977–1981 to 57 000 pairs in 2010–2014. Although four colonies had >10 000 pairs in 1977–1981, there was just
Autor:
Lauren J. Waller, Bruce M. Dyer, RM Randall, Rjm Crawford, J Visagie, Deon Geldenhuys, L Upfold, Azwianewi B. Makhado
Publikováno v:
African Journal of Marine Science; Vol 34, No 3 (2012)
During 2008–2012, the number of crowned cormorants Phalacrocorax coronatus breeding in South Africa was c. 1 900 pairs, compared to 1 700 pairs for 1977–1981. Numbers at 10 islands in the Western Cape province fluctuated around a level of 1 100 p
Publikováno v:
Ostrich. 80:35-41
The Wilderness Lakes system, comprising three estuarine lakes (Eilandvlei, Langvlei and Rondevlei), supports a diverse waterbird community, which includes 12 duck species and the abundant Red-knobbed Coot Fulica cristata. Biannual counts of waterfowl
Autor:
RM Randall, N. T. W. Klages, PA Bartlett, AC Wolfaardt, YJ Chesselet, R Jones, R. J. M. Crawford, PA Whittington, BM Randall
Publikováno v:
African Journal of Marine Science. 27:205-213
Of over 20 000 African penguins Spheniscus demersus that had been flipper-banded as chicks between 1978 and 1999, 2% of those re-sighted after fledging settled to breed at non-natal colonies. This represented 14% of the banded birds that were subsequ
Autor:
R. J. M. Crawford, RM Randall, PA Whittington, YJ Chesselet, R Jones, PA Bartlett, AC Wolfaardt, BM Randall, N. T. W. Klages
Publikováno v:
African Journal of Marine Science. 27:215-229
The direction, distance and seasonal patterns of movements of African penguins Speniscus demersus between breeding colonies were investigated for birds that had been flipper-banded between 1970 and 1998. These were comprised of 3 986 penguins banded
Autor:
S. A. Davis, R. J. M. Crawford, Michael A. Meÿer, A. J. Willlams, A. C. Wolfaardt, T. M. Leshoro, L. F. Jackson, A. P. van Dalsen, RM Randall, L Upfold, R. T. Harding, P. A. Whitington, Les G. Underhill, E. van der Merwe
Publikováno v:
South African Journal of Marine Science. 22:157-176
On 23 June 2000, the bulk ore carrier MV Treasure sank off western South Africa between Dassen and Robben islands, which individually currently support the largest and 3rd largest colonies of African penguins Spheniscus demersus. Subsequently, more t
Autor:
N. T. W. Klages, RM Randall, Bruce M. Dyer, A. J. Williams, YJ Chesselet, J. H. Hofmeyr, John E. Cooper, R. J. M. Crawford
Publikováno v:
South African Journal of Marine Science. 16:101-118
The entire nesting population of African penguins Spheniscus demersus was about 575 000 adults at the start of the 20th century. Numbers halved by the 1950s and continued to fall to about 220 000 by the late 1970s and about 180 000 by the early 1990s
Publikováno v:
African Journal of Ecology.