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Author Speake B.K., Decrock F., Groscolas R., Surai P.F. & Woods N.
Title Establishment of the brain's fatty acid profile during embryonic development of the king penguin (Aptenodytes patagonicus): effects of a yolk which is naturally rich in n-3 polyunsaturates. Type Journal Article
Year 2003 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 76 Issue Pages 187-195
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Programme 119
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ISSN 1522-2152 ISBN Medium
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Notes Approved yes
Call Number Serial 2484
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Author Cherel Y., Hobson K.A. & Hassani S.
Title Isotopic discrimination between food and blood and feathers of captive penguins : implications for dietary studies in the wild. Type Journal Article
Year 2005 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 78 Issue Pages 106-115
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Programme 109
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Notes Approved yes
Call Number Serial 2855
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Author Halsey L.G., Butler P.J., Fahlman A., Woakes A.J. & Y. Handrich
Title Behavioural and physiological significance of minimum resting metabolic rate in king penguins. Type Journal Article
Year 2008 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 81 Issue 1 Pages
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Programme 394
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ISSN 1522-2152 ISBN Medium
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Notes Approved yes
Call Number Serial 4555
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Author
Title Corticosterone and foraging behavior in a pelagic seabird. Type Journal Article
Year 2007 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 80 Issue Pages 283-292
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Programme 109
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ISSN 1522-2152 ISBN Medium
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Notes Approved yes
Call Number Serial 4591
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Author Halsey,L.G.;Handrich, Y.; Rey, B,Fahlman, A.; Woakes, A.J.; Butler, P.J.
Title Recovery from Swimming-Induced Hypothermia in King Penguins: Effects of Nutritional Condition Type Journal Article
Year 2008 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 81 Issue 4 Pages
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Abstract
Programme 131;394
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ISSN 1522-2152 ISBN Medium
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Notes Approved yes
Call Number Serial 5046
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Author
Title Body Mass and Clutch Size May Modulate Prolactin and Corticosterone Levels in Eiders Type Journal Article
Year 2006 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 79 Issue 3 Pages 514-521
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Abstract Altered body condition, increased incubation costs, and egg loss are important proximate factors modulating bird parental behavior, since they inform the adult about its remaining chances of survival or about the expected current reproductive success. Hormonal changes should reflect internal or external stimuli, since corticosterone levels (inducing nest abandonment) are known to increase while body condition deteriorates, and prolactin levels (stimulating incubation) decrease following egg predation. However, in a capital incubator that based its investment on available body reserves and naturally lost about half of its body mass during incubation, corticosterone should be maintained at a low threshold to avoid protein mobilization for energy supply. This study focused on the regulation of corticosterone and prolactin release in such birds during incubation, when facing egg manipulation (control, reduced, or increased) or a stressful event. Blood samples were taken before and after clutch manipulation and at hatching. Corticosterone levels were determined before and after 30 min of captivity. Female eiders exhibited a high hypothalamic?pituitary?adrenal sensitivity, plasma concentration of corticosterone being increased by four? to fivefold following 30 min of captivity. The adrenocortical response was not modified by body mass loss but was higher in birds for which clutch size was increased. In the same way, females did not show different prolactin levels among the experimental groups. However, when incubation started, prolactin levels were correlated to body mass, suggesting that nest attendance is programmed in relation to the female initial body condition. Moreover, due to an artifactual impact of bird manipulation, increased baseline corticosterone was associated with a prolactin decrease in the control group. These data suggest that, in eiders, body mass and clutch size modification can modulate prolactin and corticosterone levels, which cross?regulate each other in order to finely control incubation behavior.
Programme 332
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Notes doi: 10.1086/501065; PMID: 16691517 Approved yes
Call Number IPEV @ Thierry.Lemaire @ Serial 5576
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Author Halsey, L.G. Butler, P.J., Fahlman, A., Bost, C.-A., Woakes, A.J., Handrich, Y.
Title Modelling the marine resources required to raise a king penguin chick in differing environments: an energetics approach. Type Journal Article
Year 2008 Publication PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 81 Issue 6 Pages 856-867
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Programme 394
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Notes Approved yes
Call Number Serial 5663
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Author
Title What factors drive prolactin and corticosterone responses to stress in a long-lived bird species (snow petrel Pagodroma nivea)? Type Journal Article
Year 2009 Publication Physiological and biochemical zoology : PBZ Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 82 Issue 5 Pages 590 -602
Keywords Adrenal Glands, Adrenal Glands: drug effects, Adrenal Glands: secretion, Adrenocorticotropic Hormone, Adrenocorticotropic Hormone: administration & dosa, Adrenocorticotropic Hormone: secretion, Animals, Behavior, Animal, Birds, Birds: blood, Birds: physiology, Breeding, Corticosterone, Corticosterone: blood, Corticosterone: secretion, Female, Longevity, Male, Models, Biological, Prolactin, Prolactin: blood, Prolactin: secretion, Reproduction, Sex Characteristics, Stress, Physiological,
Abstract Life-history theory predicts that individuals should adapt their parental investment to the costs and benefits of the current reproductive effort. This could be achieved by modulating the hormonal stress response, which may shift energy investment away from reproduction and redirect it toward survival. In birds, this stress response consists of a release of corticosterone that may be accompanied by a decrease in circulating prolactin, a hormone involved in the regulation of parental care. We lack data on the modulation of the prolactin stress response. In this study, we tested the hypothesis that individuals should modulate their prolactin stress response according to the fitness value of the current reproductive effort relative to the fitness value of future reproduction. Specifically, we examined the influence of breeding status (failed breeders vs. incubating birds) and body condition on prolactin and corticosterone stress responses in a long-lived species, the snow petrel Pagodroma nivea. When facing stressors, incubating birds had higher prolactin levels than failed breeders. However, we found no effect of body condition on the prolactin stress response. The corticosterone stress response was modulated according to body condition but was not affected by breeding status. We also performed an experiment using injections of adrenocorticotropic hormone (ACTH) and found that the modulation of the corticosterone stress response was probably associated with a reduction in ACTH release by the pituitary and a decrease in adrenal sensitivity to ACTH. In addition, we examined whether prolactin and corticosterone secretion were functionally linked. We found that these two hormonal stress responses were not correlated. Moreover, injection of ACTH did not affect prolactin levels, demonstrating that short-term variations in prolactin levels are not governed directly or indirectly by ACTH release. Thus, we suggest that the corticosterone and prolactin responses to short-term stressors are independent and may therefore mediate some specific components of parental investment in breeding birds. With mounting evidence, we suggest that examining both corticosterone and prolactin stress responses could be relevant to parental investment in vertebrates.
Programme 109
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Call Number Serial 2219
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Author
Title Body Girth as an Alternative to Body Mass for Establishing Condition Indexes in Field Studies: A Validation in the King Penguin Type Journal Article
Year 2012 Publication PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 85 Issue 5 Pages 533-542
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Abstract ABSTRACT
Body mass and body condition are often tightly linked to animal health and fitness in the wild and thus are key measures for ecophysiologists and behavioral ecologists. In some animals,
such as large seabird species, obtaining indexes of structural size is relatively easy, whereas measuring body mass under specific field circumstances may be more of a challenge. Here, we
suggest an alternative, easily measurable, and reliable surrogate of body mass in field studies, that is, body girth. Using 234 free-living king penguins (Aptenodytes patagonicus) at various
stages of molt and breeding, we measured body girth under the flippers, body mass, and bill and flipper length. We found that body girth was strongly and positively related to body mass
in both molting (R2=0.91) and breeding (R2=0.73) birds,with the mean error around our predictions being 6.4%. Body girth appeared to be a reliable proxy measure of body mass because the relationship did not vary according to year and experimenter, bird sex, or stage within breeding groups. Body
girth was, however, a weak proxy of body mass in birds at the end of molt, probably because most of those birds had reached a critical depletion of energy stores. Body condition indexes
established from ordinary least squares regressions of either body girth or body mass on structural size were highly correlated (r=0.91), suggesting that body girth was as good as s
body mass in establishing body condition indexes in king penguins. Body girth may prove a useful proxy to body mass for estimating body condition in field investigations and could
likely provide similar information in other penguins and large animals that may be complicated to weigh in the wild.
Programme 119
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Call Number Serial 4184
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Author Portugal S.J., Green J.A., Arnold W., Careau V., Dann P, Frappell P.B., Gremillet D., Handrich Y., Martin G.R., Ruf T., Guillemette M.M., Butler P.J. & L.G. Halsey
Title The Association between Resting, Activity and Daily Metabolic Rate in Free-Living Endotherms: No Universal Rule in Birds and Mammals. Type Journal Article
Year 2016 Publication Physiological and biochemical zoology Abbreviated Journal (down) Physiol. Biochem. Zool.
Volume 89 Issue 3 Pages 251-261
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Abstract Energy management models provide theories and predictions for how animals manage their energy budgets within their energetic constraints, in terms of their resting metabolic rate (RMR) and daily energy expenditure (DEE). Thus, uncovering what associations exist between DEE and RMR is key to testing these models. Accordingly, there is considerable interest in the relationship between DEE and RMR at both inter-and intraspecific levels. Interpretation of the evidence for particular energy management models is enhanced by also considering the energy spent specifically on costly activities (activity energy expenditure [AEE] = DEE 2 RMR). However, to date there have been few intraspecific studies investigating such patterns. Our aim was to determine whether there is a generality of intraspecific relationships among RMR, DEE, and AEE using long-term data sets for bird and mammal species. For mammals, we use minimum heart rate (f(H)), mean fH, and activity fH as qualitative proxies for RMR, DEE, and AEE, respectively. For the birds, we take advantage of calibration equations to convert fH into rate of oxygen consumption in order to provide quantitative proxies for RMR, DEE, and AEE. For all 11 species, the DEE proxy was significantly positively correlated with the RMR proxy. There was also evidence of a significant positive correlation between AEE and RMR in all four mammal species but only in some of the bird species. Our results indicate there is no universal rule for birds and mammals governing the relationships among RMR, AEE, and DEE. Furthermore, they suggest that birds tend to have a different strategy for managing their energy budgets from those of mammals and that there are also differences in strategy between bird species. Future work in laboratory settings or highly controlled field settings can tease out the environmental and physiological processes contributing to variation in energy management strategies exhibited by different species.Keywords
Programme 394
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Notes Approved yes
Call Number Serial 6517
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