Beak colour dynamically signals changes in fasting status and parasite loads in king penguins

This research was funded by the French Polar Institute (IPEV–Research Program 119) and the French National Centre for Scientific Research (CNRS-INEE). Field logistic support was provided by Terres Australes et Antarctiques Françaises. Q.S. was funded by a doctoral fellowship from the Ministère Français de l’Education Supérieur et de la Recherche. We thank all over-wintering assistants: Benoit Gineste, Sylvia Pardonnet, Laureline Durand, Emilie Lefol and Hédi Saadaoui for field work and Emilio Rojas for helpful discussion on the analyses. We apologize to our stick insect (Carausius morosus) for bearing with VAV’s inquisitive curiosity during our debates on color ornaments in king penguins. We sincerely thank the editor and 2 anonymous reviewers for their helpful comments on a previous version of the paper.Peer reviewedPostprin

Independent living programs and foster youth perceptions

The purpose of this study was to conduct a descriptive and exploratory analysis of Riverside County\u27s Independent Living Skills Program (ILSP) and its ability to prepare foster youth for successful adult transition. A vital component of this study was the exploration of perceived preparedness through the eyes of the participants enrolled in this program

Аналитический метод решения нестационарных дифференциальных игр сближения

Досліджено ігрову задачу зближення для нестаціонарних динамічних процесів, що функціонують в умовах невизначеності та протидії. При цьому термінальна множина представляє собою циліндричне багатозначне відображення. На основі методу розв’язуючих функцій отримано достатні умови завершення гри в класі квазі- та стробоскопічних стратегій для різних схем методу. Проведено порівняння гарантованих часів. Результати ілюструються на моделі з інтегральним блоком керування та ігрових задачах з простим рухом.The game problem of pursuit is studied for dynamic processes evolving under uncertainty and counteraction. The terminal set is supposed to be a cylindrical set-valued mapping. The method of resolving functions is used to derive the sufficient conditions for the game termination in the class of quasi- and stroboscopic strategies for various schemes of the method. The guaranteed times are compared. The results are illustrated using the model with integral control unit and game problems with simple motion

The oxidative debt of fasting : evidence for short to medium-term costs of advanced fasting in adult king penguins

This research was funded by the French Polar Institute (IPEV–Research Program 119) and the French National Centre for Scientific Research (CNRS-INEE). We are especially grateful to Dominic L. Cram and one anonymous reviewer for helpful comments on the paper. Field logistic support was provided by Terres Australes et Antarctiques Françaises. QS was funded by a doctoral fellowship from the Ministère Français de l’Education Supérieur et de la Recherche.Peer reviewedPublisher PD

Landings, vol. 30, no. 11

Landings content emphasizes science, history, resource sustainability, economic development, and human interest stories related to Maine\u27s lobster industry. The newsletter emphasizes lobstering as a traditional, majority-European American lifeway with an economic and social heritage unique to the coast of Maine. The publication focuses how ongoing research to engage in sustainable, non-harmful, and non-wasteful commercial fishing practices benefit both the fishery and Maine\u27s coastal legacy. For more information, please visit the Maine Lobstermen’s Community Alliance (MLCA) website

Behavioural Adjustment in Response to Increased Predation Risk: A Study in Three Duck Species

Predation directly triggers behavioural decisions designed to increase immediate survival. However, these behavioural modifications can have long term costs. There is therefore a trade-off between antipredator behaviours and other activities. This trade-off is generally considered between vigilance and only one other behaviour, thus neglecting potential compensations. In this study, we considered the effect of an increase in predation risk on the diurnal time-budget of three captive duck species during the wintering period. We artificially increased predation risk by disturbing two groups of 14 mallard and teals at different frequencies, and one group of 14 tufted ducks with a radio-controlled stressor. We recorded foraging, vigilance, preening and sleeping durations the week before, during and after disturbance sessions. Disturbed groups were compared to an undisturbed control group. We showed that in all three species, the increase in predation risk resulted in a decrease in foraging and preening and led to an increase in sleeping. It is worth noting that contrary to common observations, vigilance did not increase. However, ducks are known to be vigilant while sleeping. This complex behavioural adjustment therefore seems to be optimal as it may allow ducks to reduce their predation risk. Our results highlight the fact that it is necessary to encompass the whole individual time-budget when studying behavioural modifications under predation risk. Finally, we propose that studies of behavioural time-budget changes under predation risk should be included in the more general framework of the starvation-predation risk trade-off

Peroxide grafted PDMS: hydrosilylation reaction study and thiol-ene chemistry as an alternative pathway

International audiencePeroxide containing PDMS were synthesized according to a new pathway. Although hydrosilylation is one of the main reaction carried out in silicone chemistry, the catalysts used are very sensitive to the chemical nature of the reactants and remained inefficient to graft allylic peroxide. Radical catalyzed thiol-ene chemistry was involved for the first time to yield an initiator group containing polymer. Peroxide grafted polysiloxane structure and decomposition were characterized using 1H, 13C and 29Si NMR, FT-IR and RAMAN spectroscopies, SEC and DSC. These macroinitiators can be used to obtain polysiloxane able to undergo cross-linking

Experimental stress during molt suggests the evolution of condition-dependent and condition-independent ornaments in the king penguin

Acknowledgments We thank Emilie Lefol for her help in the field, and two anonymous reviewers for their comments on the manuscript. This research was funded by the French Polar Institute (IPEV– Research Program 119) and the French National Centre for Scientific Research (CNRS- INEE). Field logistic support was provided by Terres Australes et Antarctiques Françaises. Q.S. was funded by a doctoral fellowship from the Ministère Français de l’Education Supérieur et de la Recherche.Peer reviewedPublisher PD

Oxidative stress and mitochondrial responses to stress exposure suggest that king penguins are naturally equipped to resist stress

We are grateful to four anonymous reviewers for their help in improving a previous draft of this manuscript and to the French Polar Institut (IPEV) for providing logistical support for this study through the programs 119 & 131. AS was self-funded during fieldwork, funded by the University of Angers during laboratory analyses, and was supported by a Marie Sklodowska-Curie Postdoctoral Fellowship (#658085) and a ‘Turku Collegium for Science and Medicine' Fellowship at the time of writing.Peer reviewedPublisher PD