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Documents disponibles écrits par cet auteur (26)
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Article
J. Ainsley, Auteur ; L. G. Underhill, Auteur
Article
L. G. Underhill, Auteur ; M. Brooks, Auteur ; M. Loftie-Eaton, Auteur
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M. Murgatroyd, Auteur ; G. Avery, Auteur ; L. G. Underhill, Auteur ; A. Amar, AuteurSpecialist predators are generally negatively impacted by habitat change. Predators that inhabit transformed areas are usually forced to diversify their diet and this departure away from traditional resources can have negative consequences for f[...]
Article
L. G. Underhill, Auteur ; J. S. Kirby, Auteur ; R. B. West, Auteur ; D. A. Scott, Auteur ; N. C. Davidson, Auteur ; L. Haanstra, Auteur ; T. Piersma, Auteur ; H. Hotker, Auteur ; D. A. Stroud, Auteur
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L. G. Underhill, AuteurAvian demography is defined here as the study of the statistics of bird populations. Ornithology has generated types of data - or been the first discipline to generate them - which do not lend themselves to standard statistical analyses. In thes[...]
Article
L. Serra, Auteur ; D. A. Whitelaw, Auteur ; A. J. Tree, Auteur ; L. G. Underhill, AuteurData on 355 Grey Plovers, Pluvialis squatorola, ringed in South Africa in 1971-1997 were analysed. Biometrics could not identify Well-defined origins in the Siberian breeding grounds, but suggested the:presence of birds from east of the Gydan Pe[...]
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M. Herremans, Auteur ; D. Philogene, Auteur ; G. D. Underhill, Auteur ; J. M. H. Raijmakers, Auteur ; L. G. Underhill, Auteur ; D. Johnson, Auteur ; H. Bernitz, Auteur ; Z. Bernitz, Auteur ; M. B. Bowker, Auteur ; S. J. De Beer, AuteurAll Levaillant's Cisticolas south of the Limpopo River art currently considered to be of the nominate race. Atlas data indicate a distinct discontinuity in the distribution, separating birds in the winter rainfall region of the Western Cape from[...]
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M. Herremans, Auteur ; D. Philogene, Auteur ; G. D. Underhill, Auteur ; J. M. H. Raijmakers, Auteur ; L. G. Underhill, Auteur ; D. Johnson, Auteur ; H. Bernitz, Auteur ; B. Bernitz, Auteur ; M. B. Bowker, Auteur ; S. J. De Beer, Auteur
Article
T. B. Oatley, Auteur ; L. G. Underhill, AuteurA model-free method utilizing randomization tests was used to compare the distances moved and elapsed times between ringing and recovery. The method was applied to ring recovery data for three weavers in southern Africa, the Cope, Ploceus capens[...]
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K. M. C. Tjorve, Auteur ; L. G. Underhill, Auteur ; G. H. Visser, AuteurWe investigated the effect of body size, parental behaviour and timing of breeding on the chick growth and energetics of three precocial shorebird (Charadrii) species in a warm sub-tropical environment: the Kittlitz's Plover Charadrius pecuarius[...]
Article
L. G. Underhill, Auteur
Article
L. Staverees, Auteur ; R. J. M. Crawford, Auteur ; L. G. Underhill, AuteurIn the 2002/2003 breeding season at Malgas Island, South Africa, 125 nests of Cape Gannets Morus capensis, of which at least one partner was of known age, were monitored. The age of birds at these nests ranged from five to 22 years. At five nest[...]
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H. Schekkerman, Auteur ; M. W. J. Van Roomen, Auteur ; L. G. Underhill, AuteurDans Ardea (86(2) 1998)Growth and survival of chicks and movements of broods were studied in Curlew Sandpipers in N.E. Taimyr, Siberia, in 1991. Breeding was synchronised, 73% of 30 clutches hatching during 10-15 July. Nests were distributed clumped in dry frost-heave[...]
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L. G. Underhill, Auteur ; K. M. Calf, Auteur
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B. Kalejta-Summers, Auteur ; M. McCarthy, Auteur ; L. G. Underhill, AuteurWaterbird counts at Cope Frats Sewage Treatment Works (Strandfontein) near Cope Town are analysed for three periods: 1953-58, 1961-67 and 1983-93. Information on waterbird abundance is also provided for the period 1979-81. One hundred and one sp[...]
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L. Serra, Auteur ; D. A. Whitelaw, Auteur ; A. J. Tree, Auteur ; L. G. Underhill, AuteurDans Ardea (87(1) 1999)Data on 355 Grey Plovers Pluvialis squatarola trapped in South Africa in 1971-1997 were used to describe seasonal body mass variation and moult in relation to their very long migrations. The estimated duration of adult primary moult, 131 days, w[...]
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L. G. Underhill, Auteur ; G. D. Underhill, Auteur ; C. N. Spottiswoode, AuteurThe duration of primary moult of adult Cape Turtle Doves Streptopelia capicola was estimated to be 192 days. 23 November was the estimated mean starting date. with 95% of birds starting within 88 days of this date. The mean body-mass of adults w[...]
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L. G. Underhill, Auteur ; G. D. Underhill, AuteurRock Pigeons Columba guinea in the Western Cape, South Africa, take an estimated 7.2 months to complete primary moult. The mean starting and completion dates are 26 December and 2 August, with 95% of birds starting and completing within two mont[...]
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K. M. Calf, Auteur ; L. G. Underhill, Auteur
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L. G. Underhill, Auteur ; R. W. Summers, Auteur
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L. G. Underhill, Auteur ; P. A. Whittington, Auteur ; K. M. Calf, Auteur
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K. M. Calf, Auteur ; L. G. Underhill, Auteur
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H. D. Oschadleus, Auteur ; G. D. Underhill, Auteur ; L. G. Underhill, AuteurTiming of breeding and moult is analysed in the Masked Weaver Ploceus velatus. It is common throughout southern Africa, which is largely a summer rainfall area. This species expanded its range into the Western Cape, a winter rainfall region, in [...]
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A. J. Williams, Auteur ; V. L. Ward, Auteur ; L. G. Underhill, Auteur
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K. Wearne, Auteur ; L. G. Underhill, Auteur
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B. Erni, Auteur ; F. Liechti, Auteur ; L. G. Underhill, Auteur ; B. Bruderer, AuteurFor the first time an almost complete sample of the seasonal course of nocturnal autumn migration was recorded by a conically scanning pencil-beam radar and was analysed with respect to weather, using a log-linear regression model. A variable ai[...]
