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Villemin, T., H. Geirsson, E. Sturkell, and F. Jouanne |
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Title  |
Active deformation at Grímsvötn subglacial volcano: a composite evolution to be deciphered, paper presented at EGU General Assembly 2009, Vienna, Austria, 19-24 April 2009. |
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2009 |
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316 |
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6002 |
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Viera Vanessa M, Viblanc Vincent A, Filippi-Codaccioni Ondine, Côté Steeve D, Groscolas René, |
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Title |
Active territory defence at a low energy cost in a colonial seabird
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Journal Article |
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2011 |
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Animal Behaviour |
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82 |
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1 |
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69-76 |
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Keywords |
activity budget, aggressive behaviour, Aptenodytes patagonicus, breeding, daily energy expenditure, king penguin, |
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Abstract |
Aggressive behaviour associated with the defence of a territory is thought to impose substantial energy costs and thus to represent a trade-off with other energy-demanding activities. The energy costs of aggressive behaviours, however, have rarely been estimated in the wild, and the overall contribution of territorial defence to daily energy expenditure has never been determined. We studied the activity budget of breeding king penguins, Aptenodytes patagonicus, equipped with heart rate data loggers to estimate the energy costs associated with territory defence in this colonial bird exhibiting very high rates of agonistic interactions. We also assessed whether threat displays imposed lower energy costs than attacks with body contact. During territorial defence (i.e. threats and physical attacks combined), energy expenditure averaged 1.27 times resting metabolic rate. Defence accounted for 13% of the daily time budget and contributed to 2.7% of the total daily energy expenditure. Interactions with body contact cost three times more than threat displays, but accounted for only 16% of the aggressive behaviours recorded. Neither did body mass, body size, penguin sex or breeding stage affect the cost of aggressiveness. Our results are consistent with previous research reporting that fighting imposes significant metabolic costs. However, we found that aggressive behaviour in king penguins was not an expensive activity compared to the total energy budget. Because king penguins go without food and are sleep deprived while breeding, they may have developed behavioural strategies (e.g. lower rates of attacks with body contact) allowing them to defend their territory efficiently at a low energy cost. |
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119 |
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0003-3472 |
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3799 |
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Sturkell, E., P. Einarsson, F. Sigmundsson, B.G. Ófeigsson, H. Geirsson, R. Pedersen, T. Árnadóttir, H. Ólafsson, E. de Zeeuw-van Dalfsen, A.T. Linde, S.I. Sacks, P.C. LaFemina, C. Pagl, T. Villemin, and H. Rymer |
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Title |
Active volcanism and associated crustal deformation in Iceland |
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Conference - International - Communication |
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2008 |
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International Association of Volcanology and Chemi |
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316 |
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5322 |
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Sturkell, E., P. Einarsson, F. Sigmundsson, B.G. Ófeigsson, H. Geirsson, R. Pedersen, T. Árnadóttir, H. Ólafsson, E. de Zeeuw-van Dalfsen, A.T. Linde, S.I. Sacks, P.C. LaFemina, C. Pagl, T. Villemin, and H. Rymer |
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Title |
Active volcanism and associated crustal deformation in Iceland. |
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Conference - International - Communication |
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2005 |
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International Association of Volcanology and Chemi |
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316 |
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yes |
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5320 |
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Weimerskirch H., Wilson R.P. & Lys P. |
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Title |
Activity pattern of foraging in the wandering albatross : a marine predator with two mades of prey searching. |
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Journal Article |
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Year |
1997 |
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Marine ecology-progress series |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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151 |
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245-254 |
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109 |
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0171-8630 |
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yes |
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1964 |
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Collins T., Meuwis M.A, Gerday C. & Feller G. |
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Title |
Activity, stability and flexibility in glycosisases adapted to extreme thermal environments. |
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Journal Article |
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2003 |
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Journal of molecular biology |
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J. Mol. Biol. |
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328 |
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2 |
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419-428 |
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Abstract |
To elucidate the strategy of low temperature adaptation for a cold-adapted family 8 xylanase, the thermal and chemical stabilities, thermal inactivation, thermodependence of activity and conformational flexibility, as well as the thermodynamic basis of these processes, were compared with those of a thermophilic homolog. Differential scanning calorimetry, fluorescence monitoring of guanidine hydrochloride unfolding and fluorescence quenching were used, among other techniques, to show that the cold-adapted enzyme is characterized by a high activity at low temperatures, a poor stability and a high flexibility. In contrast, the thermophilic enzyme is shown to have a reduced low temperature activity, high stability and a reduced flexibility. These findings agree with the hypothesis that cold-adapted enzymes overcome the quandary imposed by low temperature environments via a global or local increase in the flexibility of their molecular edifice, with this in turn leading to a reduced stability. Analysis of the guanidine hydrochloride unfolding, as well as the thermodynamic parameters of irreversible thermal unfolding and thermal inactivation shows that the driving force for this denaturation and inactivation is a large entropy change while a low enthalpy change is implicated in the low temperature activity. A reduced number of salt-bridges are believed to be responsible for both these effects. Guanidine hydrochloride unfolding studies also indicate that both family 8 enzymes unfold via an intermediate prone to aggregation. |
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193 |
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0022-2836 |
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yes |
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2379 |
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Author |
Huston A., Haeggstrom J. & Feller G. |
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Activity, stability and flexibility of a cold-active aminopeptidase produced by marine psychrophile Colwellia psychrerythraea strain 34H. |
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Conference - International - Poster |
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2004 |
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Extremophiles |
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2004. Cambridge (USA) |
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193 |
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3919 |
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Author |
Tiphaine Jeanniard‐du‐Dot, Andrew W. Trites, John P. Y. Arnould, John R. Speakman, Christophe Guinet |
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Title |
Activity-specific metabolic rates for diving, transiting, and resting at sea can be estimated from time–activity budgets in free-ranging marine mammals |
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2017 |
Publication |
Ecology and Evolution |
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7 |
Issue |
9 |
Pages |
2969-2976 |
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Keywords |
Antarctic fur seal Arctocephalus gazella Callorhinus ursinus diving energy expenditure foraging metabolic rate northern fur seal time–activity budget |
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Time and energy are the two most important currencies in animal bioenergetics. How much time animals spend engaged in different activities with specific energetic costs ultimately defines their likelihood of surviving and successfully reproducing. However, it is extremely difficult to determine the energetic costs of independent activities for free-ranging animals. In this study, we developed a new method to calculate activity-specific metabolic rates, and applied it to female fur seals. We attached biologgers (that recorded GPS locations, depth profiles, and triaxial acceleration) to 12 northern (Callorhinus ursinus) and 13 Antarctic fur seals (Arctocephalus gazella), and used a hierarchical decision tree algorithm to determine time allocation between diving, transiting, resting, and performing slow movements at the surface (grooming, etc.). We concomitantly measured the total energy expenditure using the doubly-labelled water method. We used a general least-square model to establish the relationship between time–activity budgets and the total energy spent by each individual during their foraging trip to predict activity-specific metabolic rates. Results show that both species allocated similar time to diving ( 29%), transiting to and from their foraging grounds ( 26–30%), and resting ( 8–11%). However, Antarctic fur seals spent significantly more time grooming and moving slowly at the surface than northern fur seals (36% vs. 29%). Diving was the most expensive activity ( 30 MJ/day if done non-stop for 24 hr), followed by transiting at the surface ( 21 MJ/day). Interestingly, metabolic rates were similar between species while on land or while slowly moving at the surface ( 13 MJ/day). Overall, the average field metabolic rate was 20 MJ/day (for all activities combined). The method we developed to calculate activity-specific metabolic rates can be applied to terrestrial and marine species to determine the energetic costs of daily activities, as well as to predict the energetic consequences for animals forced to change their time allocations in response to environmental shifts. |
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109 |
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2045-7758 |
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2045-7758 |
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7163 |
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D’Amico S., Collins, T., Georlette D, Marx J.C., Gerday C. & Feller G. |
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Title |
Activity-stability relationships in extremophilic enzymes |
Type |
Conference - International - Communication |
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2004 |
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Extremophiles |
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Cambridge (USA) |
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193 |
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3914 |
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D'amico S., Marx J.C., Gerday C. & Feller G. |
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Title |
Activity-stability relationships in extremophilic enzymes. |
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Journal Article |
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2003 |
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Journal of biological chemistry |
Abbreviated Journal |
J. Biol. Chem. |
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278 |
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7891-7896 |
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193 |
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0021-9258 |
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2380 |
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