SEX RATIOS, MORPHOLOGY AND GROWTH OF THE AFRICAN BUCK DUCK

References

• Balát , F. 1970 . On the wing-moult in the Mallard, Anas platyrhynchos, in Czechoslovakia. . Zool. Listy , 19 : 135 – 144 .
   Google Scholar
• Ball , I. J. , Frost , P. G. H. , Siegfried , W. R. and Mckinney , F. 1978 . Territories and local movements of African Black Ducks. . Wildfowl , 29 : 61 – 79 .
   Google Scholar
• Baldwin , S. P. and Kendeigh , S. C. 1938 . Variations in the weights of birds. . Auk , 55 : 416 – 467 .
   Google Scholar
• Bellrose , F. C. , Scott , T. G. , Hawkins , A. S. and Low , J. B. 1961 . Sex ratios and age ratios in North American ducks. III. . Nat. Hist. Surv. Bull , 27 : 391 – 474 .
   Google Scholar
• Boyd , H. 1961 . The flightless period of the Mallard in England. . Wildfowl Trust Ann. Rep , 12 : 140 – 143 .
   Google Scholar
• Dean , W. R.J. and Skead , D. M. 1977 . The sex ratio in Yellowbilled Duck, Redbilled Teal and Southern-Pochard. . Ostrich Suppl , 12 : 82 – 85 .
   Google Scholar
• Johnsoard , P. A. 1966 . The biology and relationship of the Torrent Duck. . Wildfowl Trust Ann. Rep , 17 : 66 – 74 .
   Google Scholar
• Johnson , N. F. 1971 . Effects of levels of dietary protein on Wood Duck growth. . J. Wildl. Mgmt , 35 : 798 – 802 .
   Google Scholar
• Johnson , D. H. and Sargeant , A. B. 1977 . Impact of Red Fox predation on the sex ratio of prairie Mallards. . U.S. Fish Wildl. Serv. Wildl. Res. Rep , 6 : 1 – 56 .
   Google Scholar
• Kear , J. 1972 . The Blue Duck of New Zealand. . Living Bird , 11 : 175 – 192 .
   Google Scholar
• Kear , J. 1975 . Salvadori's Duck of New Guinea. . Wildfowl , 26 : 104 – 111 .
   Google Scholar
• Kear , J. and Burton , P. J. K. 1971 . The food and feeding apparatus of the Blue Duck . Hymenolaimus. Ibis , 113 : 483 – 493 .
   Web of Science ®Google Scholar
• Kear , J. and Steel , T. H. 1971 . Aspects of social behaviour in the Blue Duck. . Notornis , 18 : 187 – 198 .
   Google Scholar
• McKinney , F. , Siegfried , W. R. , Ball , I. J. and Frost , P. G. H. 1978 . Behavioral specializations for river life in the African Black Duck (Anas sparsa Eyton). . Z. Tierpsychol , 48 : 349 – 400 .
   Google Scholar
• Rand , A. L. 1954 . On the spurs on birds' wings. . Wilson Bull , 66 : 127 – 134 .
   Google Scholar
• Siegfried , W. R. 1962 . Observations on the post embryonic development of the Egyptian Goose Alopochen aegyptiacus (L.) and the Redbill Teal Anas erythrorhyncha Gmelin. . Cape Dept. Nat. Cons. Invest. Report , : 29 – 17 .
   Google Scholar
• Siegfried , W. R. 1968 . The Black Duck in the south-western Cape. . Ostrich , 39 : 61 – 75 .
   Google Scholar
• Siegfried , W. R. , Ball , I. J. , Frost , P. G.H. and McKinney , D. F. 1975 . Waterfowl populations in the Eerste River Valley. . J. S. Afr. Wildl. Mgmt Ass , 5 : 69 – 73 .
   Google Scholar
• Siegfried , W. R. , Frost , P. G. H. , Ball , I. J. and McKinney , D. F. 1977 . Effects of radio packages on African Black Ducks. S. . Afr. J. Wildl. Res , 7 : 37 – 40 .
   Web of Science ®Google Scholar
• Taber , R. D. 1969 . “ Criteria of sex and age. ” . In Wildlife management techniques Edited by: Giles , R. H. Washington, D.C. : Wildlife Soc. .
   Google Scholar
• Weller , M. 1968 . Plumages and wing spurs of Torrent Ducks . Merganetta armata. Wildfowl , 19 : 33 – 40 .
   Google Scholar