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The Penguins: Spheniscidae
This book discusses penguin origins and evolution, breeding biology and moult, population structure and dynamics, and conservation: threats to penguin populations. Expand
Individual variation in endocrine systems: moving beyond the ‘tyranny of the Golden Mean’
  • T. Williams
  • Biology, Medicine
  • Philosophical Transactions of the Royal Society B…
  • 12 May 2008
This paper reviews the state of knowledge of the magnitude, mechanisms and functional significance of phenotypic variation, plasticity and flexibility in endocrine systems, and argues for a renewed focus on inter-individual variability. Expand
Stress Hormones: A Link between Maternal Condition and Sex‐Biased Reproductive Investment
The results suggest that maternal stress hormones provide a mechanistic link between maternal quality and sex‐biased maternal investment in offspring, and in birds, deposition of yolk corticosterone may benefit mothers by acting as a bet‐hedging strategy in stochastic environments. Expand
The Adaptive Value of Stress‐Induced Phenotypes: Effects of Maternally Derived Corticosterone on Sex‐Biased Investment, Cost of Reproduction, and Maternal Fitness
Results indicate that the transfer of stress hormones to eggs by low‐quality mothers can be adaptive since corticosterone‐mediated sex‐biased investment matches the quality of a mother to offspring demand, ultimately increasing maternal fitness. Expand
Seasonal dynamics of flight muscle fatty acid binding protein and catabolic enzymes in a migratory shorebird.
An ELISA to measure heart-type fatty acid binding protein (H-FABP) in muscles of the western sandpiper (Calidris mauri), a long-distance migrant shorebird, suggests that endurance flight training may be required to stimulate H-fABP expression. Expand
Mechanisms Underlying the Costs of Egg Production
It is argued that hormonally mediated, non-resource-based costs of egg production caused by pleiotropic effects of reproductive hormones that can operate over the longer time scales at which costs of reproduction are expressed. Expand
Plasticity in the adrenocortical response of a free-living vertebrate: The role of pre- and post-natal developmental stress
The quality of both the pre- and post-natal developmental environment can be a significant source of variation in the responsiveness of the HPA axis, and provides a frame-work for examining ecologically-relevant sources of stress-induced programming and plasticity in this endocrine system in a free-living vertebrate, respectively. Expand
Endocrinology: The Developing Synthesis between Endocrinology and Evolutionary Genetics
Concentrations of circulating hormones and the activities of titer regulators are focused on, and variation in brain neurohormones, bone-regulating hormones, and hormone receptor gene sequences that underlie ecologically important genetic polymorphisms are identified. Expand
Mediation of a corticosterone-induced reproductive conflict
The results suggest that CORT and CBG interact to play a role in mediating the increased energetic demand of offspring, while minimizing the chances of nest desertion, thereby alleviating any potential behavioral conflict for CORT during reproduction. Expand