Publications

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body temperatures of free-living african penguins (spheniscus demersus) and bank cormorants (phalacrocorax neglectus).two free-living seabirds (the african penguin spheniscus demersus and the bank cormorant phalacrocorax neglectus) were equipped with stomach temperature-loggers to study body temperature changes during foraging. body temperature in these endotherms was environmentally and activity-dependent and varied in the case of the cormorant by over 5 degrees c. considerations of heat flux show that such flexibility confers considerable energetic advantages: by allowing body temperature to drop when the hea ...19968896365
defining ecologically relevant scales for spatial protection with long-term data on an endangered seabird and local prey availability.human activities are important drivers of marine ecosystem functioning. however, separating the synergistic effects of fishing and environmental variability on the prey base of non-target predators is difficult, often because prey availability estimates on appropriate scales are lacking. understanding how prey abundance at different spatial scales links to population change can help integrate the needs of non-target predators into fisheries management by defining ecologically-relevant areas for ...201728248436
molecular characterization of babesia peircei and babesia ugwidiensis provides insight into the evolution and host specificity of avian piroplasmids.there are 16 recognized species of avian-infecting babesia spp. (piroplasmida: babesiidae). while the classification of piroplasmids has been historically based on morphological differences, geographic isolation and presumed host and/or vector specificities, recent studies employing gene sequence analysis have provided insight into their phylogenetic relationships and host distribution and specificity. in this study, we analyzed the sequences of the 18s rrna gene and its-1 and its-2 regions of t ...201728913165
parenting in a warming world: thermoregulatory responses to heat stress in an endangered seabird.the frequency of extreme weather events, including heat waves, is increasing with climate change. the thermoregulatory demands resulting from hotter weather can have catastrophic impacts on animals, leading to mass mortalities. although less dramatic, animals also experience physiological costs below, but approaching, critical temperature thresholds. these costs may be particularly constraining during reproduction, when parents must balance thermoregulation against breeding activities. such chal ...202031976077
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