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Documents disponibles écrits par cet auteur (11)
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Article
Caroline Howes, Auteur ; Patrik Byholm, Auteur ; Craig T. Symes, AuteurDecreases in suitable habitat due to loss and fragmentation on the African non-breeding grounds are believed to be a driver of the declines in Palaearctic migrants. However, the effects of habitat loss and fragmentation on individual migrants ha[...]
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Colleen T. Downs, Auteur ; Mark Brown, Auteur ; Lorinda Hart, Auteur ; Craig T. Symes, AuteurWorldwide, there is concern about the increased prevalence of infectious diseases and their effects on biodiversity. Increasing changes in the environment, particularly changes in climatic conditions as a consequence of anthropogenic-induced cli[...]
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Craig T. Symes, Auteur ; Andrew E. McKechnie, Auteur ; Susan W. Nicolson, Auteur ; Stephan M. Woodborne, AuteurThe winter-flowering succulent Aloe marlothii provides nectar for many opportunistic avian nectarivores in southern African savannas. We assessed the importance of A. marlothii nectar sugar for opportunistic nectarivores by analysing temporal ch[...]
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Darren W. Pietersen, Auteur ; Craig T. Symes, AuteurThe diets of Falco amurensis and F. naumanni were investigated by analysing the respective stomach contents of 64 and 22 individuals killed during a severe thunderstorm in December 2004. Interpretations of diet were made by considering (1) bioma[...]
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Craig T. Symes, AuteurDans Ostrich (85(3) 2014)Parrots (families Psittacidae and Cacatuidae) are one of the most threatened taxa of birds, with a combination of threats to wild populations, including capture for the cage bird market, habitat modification and destruction, persecution, disease[...]
Article
Craig T. Symes, Auteur ; Stephan Woodborne, AuteurStable isotopes (delta D, delta C-13, delta N-15) were measured in adult and juvenile Amur Falcon Falco amurensis feathers to understand the migratory connectivity of this species. Using the OIPC (Online Isotopes in Precipitation Calculator) and[...]
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Craig T. Symes, Auteur ; Annie R. Antonites, AuteurOur study reports on contrasts in prey items from African Crowned Eagle Stephanoaetus coronatus nesting in forest (n = 1) and savanna (n = 2) biomes in KwaZulu-Natal, South Africa. At least 12 taxa were identified at a forest nest, of which 92.1[...]
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Craig T. Symes, Auteur ; John W. Wilson, AuteurWe investigated primary moult and morphometrics in the Green-winged Pytilia Pytilia melba during a six-month period (May-October) in central South Africa. A total of 157 pytilias were captured; 80 (51.0%) of these were in active primary moult du[...]
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Craig T. Symes, Auteur ; Susan W. Nicolson, Auteur ; Andrew E. McKechnie, AuteurIn southern Africa, Aloe marlothii flowers during the dry winter season and offers copious dilute nectar to a variety of birds. Avian abundance and community composition were monitored at an A. marlothii forest at Suikerbosrand Nature Reserve, S[...]
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Stuart J. Marsden, Auteur ; Craig T. Symes, Auteur ; Andrew L. Mack, AuteurIn comparison with other tropical forest land uses such as selective logging, little is known of the impacts on wildlife of the many forms of small-scale agriculture practised across the tropics. We present density estimates, derived using a poi[...]
Article
Craig T. Symes, Auteur ; Stephan M. Woodborne, AuteurWe measured delta C-13 and delta N-15 isotope signatures in flight feathers of a White-bellied Sunbird to assess the value of using stable isotopes of feathers in avian dietary studies. Significant variation in delta C-13 and delta N-15 isotope [...]
