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Documents disponibles écrits par cet auteur (18)
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Article
Ryno Kemp, Auteur ; Robin Colyn, Auteur ; Marc T. Freeman, Auteur ; Andrew E. McKechnie, AuteurMany desert birds are vulnerable to anthropogenic global warming and landscape transformation, particularly in the case of range- restricted species. We quantified suitable habitat and the current population of Red Larks Calendulauda burra (fami[...]
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Michelle Bouwer, Auteur ; Celiwe A. Ngcamphalala, Auteur ; André Ganswindt, Auteur ; Andrew E. McKechnie, AuteurQuantification of glucocorticoids and their metabolites as a central component of the physiological stress response has many potential applications in ornithological research, but require careful species-specific validations. We established a re[...]
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Ryno Kemp, Auteur ; Marc T. Freeman, Auteur ; Barry van Jaarsveld, Auteur ; Zenon J. Czenze, Auteur ; Shannon R. Conradie, Auteur ; Andrew E. McKechnie, AuteurBehavioural trade-offs between foraging and thermoregulation result in negative relationships between diurnal body mass (M b) gain and daily maximum air temperature (T max) in arid-zone birds. However, it remains unclear how these trade-offs are[...]
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Darren W. Pietersen, Auteur ; Andrew E. McKechnie, Auteur ; Raymond Jansen, Auteur ; Ian T. Little, Auteur ; Armanda D. S. Bastos, AuteurDans Ibis (161(4) 2019)The globally distributed avian family Motacillidae consists of five to seven genera (Anthus, Dendronanthus, Tmetothylacus, Macronyx and Motacilla, and depending on the taxonomy followed, Amaurocichla and Madanga) and 66–68 recognized species, of[...]
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Darren W. Pietersen, Auteur ; Ian T. Little, Auteur ; Raymond Jansen, Auteur ; Andrew E. McKechnie, AuteurThe Yellow-breasted Pipit (Anthus chloris) is endemic to the eastern escarpment of South Africa, marginally entering eastern Lesotho. This species is classified as globally Vulnerable due to a perceived decreasing population size and loss of hab[...]
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Ryno Kemp, Auteur ; Matthew J. Noakes, Auteur ; Andrew E. McKechnie, AuteurHeterothermic responses characterised by pronounced hypometabolism and reductions in body temperature (T-b) are one of the most effective ways in which small endotherms can offset the energetic cost of endothermic homeothermy. It remains unclear[...]
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Ben Smit, Auteur ; Andrew E. McKechnie, AuteurEndothermic animals resident in hot, arid terrestrial environments are likely to face a trade-off between their ability to obtain water and elevated thermoregulatory water requirements. We assessed whether daily water flux (DWF) is higher on hot[...]
Article
Ben Smit, Auteur ; Andrew E. McKechnie, AuteurEndothermic animals resident in hot, arid terrestrial environments are likely to face a trade-off between their ability to obtain water and elevated thermoregulatory water requirements. We assessed whether daily water flux (DWF) is higher on hot[...]
Article
Ben Smit, Auteur ; Andrew E. McKechnie, AuteurEndothermic animals resident in hot, arid terrestrial environments are likely to face a trade-off between their ability to obtain water and elevated thermoregulatory water requirements. We assessed whether daily water flux (DWF) is higher on hot[...]
Article
Andrew E. McKechnie, Auteur ; Matthew J. Noakes, Auteur ; Ben Smit, AuteurThe adjustment of resting metabolic rates represents an important component of avian seasonal acclimatization, with recent studies revealing substantial differences between summer and winter in birds from a wide range of latitudes. We compared s[...]
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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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James Wakelin, Auteur ; Andrew E. McKechnie, Auteur ; Stephan Woodborne, AuteurThe Blue Swallow (Hirundo atrocaerulea) is a threatened intra-African migrant with breeding populations in three geographically disjunct regions. We analysed stable hydrogen, nitrogen and carbon isotope ratios in feather keratin to determine whe[...]
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Ryan S. O'Connor, Auteur ; R. Mark Brigham, Auteur ; Andrew E. McKechnie, AuteurEndotherms allocate large amounts of energy and water to the regulation of a precise body temperature (T-b), but can potentially reduce thermoregulatory costs by allowing T-b to deviate from normothermic levels. Many data on heterothermy at low [...]
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Robert A. M. Ashdown, Auteur ; Andrew E. McKechnie, AuteurWe examined environmental correlates of activity in the Freckled Nightjar (Caprimulgus tristigma), a nocturnal aerial insectivore that is resident year-round in the colder and drier parts of southern Africa. Specifically, we tested the predictio[...]
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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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Corneile Minnaar, Auteur ; Justin G. Boyles, Auteur ; Ingrid A. Minnaar, Auteur ; Catherine L. Sole, Auteur ; Andrew E. McKechnie, Auteur1. Artificial night lighting threatens to disrupt strongly conserved light-dependent processes in animals and may have cascading effects on ecosystems as species interactions become altered. Insectivorous bats and their prey have been involved i[...]
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Andrew E. McKechnie, Auteur ; Ben Smit, AuteurDans Ostrich (81(2) 2010)Torpor has been documented in a number of avian orders, but our understanding of the phylogenetic distribution of this phenomenon is far from complete, and several groups have yet to be investigated. We examined patterns of rest- and active-phas[...]
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Andrew E. McKechnie, Auteur ; Robert A. M. Ashdown, Auteur ; Murray B. Christian, Auteur ; R. Mark Brigham, AuteurRecent data Suggest that facultative hypothermic responses such as torpor are more important in the energy balance of birds from tropical and sub-tropical regions than previously thought. We used telemetric measurements of skin temperature (T(sk[...]
