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Author |
Merkling T*, Perrot C*, Helfenstein F, Ferdy J-B, Gaillard L, Lefol E, Voisin E, Hatch SA, Danchin E & Blanchard P (* co first authors) |
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Title |
Does parent-offspring conflict shape the relationship between environmental conditions and maternal effects? An experimental test |
Type |
Journal Article |
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Year |
2016 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
6 |
Issue |
11 |
Pages |
3699-3710 |
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Abstract |
Maternal effects occur when the mother's phenotype influences her offspring's phenotype. In birds, differential allocation in egg yolk components can allow mothers to compensate for the competitive disadvantage of junior chicks. We hypothesize that the parent–older chick conflict peaks at intermediate conditions: parents benefit from the younger chick(s) survival, but its death benefits the older chick in terms of growth and survival. We thus expect maternal compensation to follow a bell-shaped pattern in relation to environmental conditions. We studied a black-legged kittiwake (Rissa tridactyla) population where previous results revealed increased allocation of yolk testosterone in younger as compared to older chicks in intermediate conditions, in line with our theoretical framework. We therefore predicted a maternally induced increase in aggressiveness, growth, and survival for younger chicks born in intermediate environmental conditions. Controlling for parental effects and chick sex, we manipulated food availability before egg laying to create a situation with intermediate (Unfed group) and good (Fed group) environmental conditions. Within each feeding treatment, we further created experimental broods where the natural hatching order was reversed to maximize our chances to observe an effect of feeding treatment on the younger chicks' aggressiveness. As predicted, we found that chick aggressiveness was higher in younger chicks born from the Unfed group (i.e., in intermediate environmental conditions), but only when they were put in a senior position, in reversed broods. Predictions on growth and survival were not confirmed. Mothers thus seem to favor the competitiveness of their younger chick in intermediate conditions via egg yolk components, but our study also suggests that hatching asynchrony need to be small for maternal compensation to be efficient. We emphasize the need for further studies investigating other chick behaviors (e.g., begging) and focusing on the relative role of different yolk components in shaping parent–offspring conflict over sibling competition. |
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1162 |
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2045-7758 |
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yes |
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6476 |
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Author |
Collet Julien, Patrick Samantha C., Weimerskirch Henri |
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Title |
Behavioral responses to encounter of fishing boats in wandering albatrosses |
Type |
Journal |
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Year |
2017 |
Publication |
Ecology and evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
10 |
Pages |
3335-3347 |
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Keywords |
competition fisheries foraging decisions movement ecology seabirds vessel monitoring system |
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Abstract |
Animals are attracted to human food subsidies worldwide. The behavioral response of individuals to these resources is rarely described in detail, beyond chances of encounters. Seabirds for instance scavenge in large numbers at fishing boats, triggering crucial conservation issues, but how the response to boats varies across encounters is poorly known. Here we examine the behavioral response of wandering albatrosses (Diomedea exulans), equipped with GPS tags, to longline fishing boats operating near their colony for which we had access to vessel monitoring system data. We distinguish between encounters (flying within 30 km of a boat) and attendance behavior (sitting on the sea within 3 km of a boat), and examine factors affecting each. In particular, we test hypotheses that the response to encountered boats should vary with sex and age in this long?lived dimorphic species. Among the 60% trips that encountered boats at least once, 80% of them contained attendance (but attendance followed only 60% of each single encounter). Birds were more attracted and remained attending longer when boats were hauling lines, despite the measures enforced by this fleet to limit food availability during operations. Sex and age of birds had low influence on the response to boats, except the year when fewer boats came fishing in the area, and younger birds were attending further from boats compared to older birds. Net mass gain of birds was similar across sex and not affected by time spent attending boats. Our results indicate albatrosses extensively attend this fishery, with no clear advantages, questioning impacts on foraging time budgets. Factors responsible for sex foraging segregation at larger scale seem not to operate at this fleet near the colony and are not consistent with predictions of optimal foraging theory on potential individual dominance asymmetries. This approach complements studies of large?scale overlap of animals with human subsidies. |
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109 |
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2045-7758 |
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2045-7758 |
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yes |
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6636 |
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Author |
Jeanniard?du?Dot Tiphaine, Trites Andrew W., Arnould John P. Y., Speakman John R., Guinet Christophe |
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Type |
Journal |
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Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
9 |
Pages |
2969-2976 |
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109 |
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ISSN |
2045-7758 |
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2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
6642 |
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Author |
Grissac Sophie, Bartumeus Frederic, Cox Sam L., Weimerskirch Henri |
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Title |
Early?life foraging: Behavioral responses of newly fledged albatrosses to environmental conditions |
Type |
Journal |
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Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
17 |
Pages |
6766-6778 |
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Programme |
109 |
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2045-7758 |
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2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
6659 |
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Author |
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Title |
Local weather and body condition influence habitat use and movements on land of molting female southern elephant seals (Mirounga leonina) |
Type |
Journal |
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Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
8 |
Issue |
12 |
Pages |
6081-6090 |
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Keywords |
body mass GPS loggers habitat selection marine mammals meteorological conditions molt pinnipeds population counts |
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Abstract |
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Programme |
1201 |
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2045-7758 |
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2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
7368 |
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Title |
Benthic species of the Kerguelen Plateau show contrasting distribution shifts in response to environmental changes |
Type |
Journal |
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Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
8 |
Issue |
12 |
Pages |
6210-6225 |
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Keywords |
conservation echinoid future predictions historical changes Kerguelen Plateau species distribution modeling |
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Abstract |
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Programme |
1044 |
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ISSN |
2045-7758 |
ISBN |
2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
7105 |
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Author |
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Title |
Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems |
Type |
Journal |
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Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
8 |
Issue |
5 |
Pages |
2752-2765 |
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Keywords |
diet myctophid prolactin seabird Southern Ocean |
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Abstract |
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Programme |
109,394 |
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Thesis |
Bachelor's thesis |
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ISSN |
2045-7758 |
ISBN |
2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
7114 |
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| Permanent link to this record |
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Author |
Julien Collet, Samantha C. Patrick, Henri Weimerskirch |
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Title |
Behavioral responses to encounter of fishing boats in wandering albatrosses |
Type |
Journal |
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Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
10 |
Pages |
3335-3347 |
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Keywords |
competition fisheries foraging decisions movement ecology seabirds vessel monitoring system |
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Abstract |
Animals are attracted to human food subsidies worldwide. The behavioral response of individuals to these resources is rarely described in detail, beyond chances of encounters. Seabirds for instance scavenge in large numbers at fishing boats, triggering crucial conservation issues, but how the response to boats varies across encounters is poorly known. Here we examine the behavioral response of wandering albatrosses (Diomedea exulans), equipped with GPS tags, to longline fishing boats operating near their colony for which we had access to vessel monitoring system data. We distinguish between encounters (flying within 30 km of a boat) and attendance behavior (sitting on the sea within 3 km of a boat), and examine factors affecting each. In particular, we test hypotheses that the response to encountered boats should vary with sex and age in this long-lived dimorphic species. Among the 60% trips that encountered boats at least once, 80% of them contained attendance (but attendance followed only 60% of each single encounter). Birds were more attracted and remained attending longer when boats were hauling lines, despite the measures enforced by this fleet to limit food availability during operations. Sex and age of birds had low influence on the response to boats, except the year when fewer boats came fishing in the area, and younger birds were attending further from boats compared to older birds. Net mass gain of birds was similar across sex and not affected by time spent attending boats. Our results indicate albatrosses extensively attend this fishery, with no clear advantages, questioning impacts on foraging time budgets. Factors responsible for sex foraging segregation at larger scale seem not to operate at this fleet near the colony and are not consistent with predictions of optimal foraging theory on potential individual dominance asymmetries. This approach complements studies of large-scale overlap of animals with human subsidies. |
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Programme |
109 |
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ISSN |
2045-7758 |
ISBN |
2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
7154 |
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| Permanent link to this record |
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Author |
Sophie de Grissac, Frederic Bartumeus, Sam L. Cox, Henri Weimerskirch |
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Title |
Early-life foraging: Behavioral responses of newly fledged albatrosses to environmental conditions |
Type |
Journal |
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Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
17 |
Pages |
6766-6778 |
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Keywords |
Diomedea exulans ecology juveniles learning seabirds tracking |
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Abstract |
In order to survive and later recruit into a population, juvenile animals need to acquire resources through the use of innate and/or learnt behaviors in an environment new to them. For far-ranging marine species, such as the wandering albatross Diomedea exulans, this is particularly challenging as individuals need to be able to rapidly adapt and optimize their movement strategies in response to the highly dynamic and heterogeneous nature of their open-ocean pelagic habitats. Critical to this is the development and flexibility of dispersal and exploratory behaviors. Here, we examine the movements of eight juvenile wandering albatrosses, tracked using GPS/Argos satellite transmitters for eight months following fledging, and compare these to the trajectories of 17 adults to assess differences and similarities in behavioral strategies through time. Behavioral clustering algorithms (Expectation Maximization binary Clustering) were combined with multinomial regression analyses to investigate changes in behavioral mode probabilities over time, and how these may be influenced by variations in day duration and in biophysical oceanographic conditions. We found that juveniles appeared to quickly acquire the same large-scale behavioral strategies as those employed by adults, although generally more time was spent resting at night. Moreover, individuals were able to detect and exploit specific oceanographic features in a manner similar to that observed in adults. Together, the results of this study suggest that while shortly after fledging juvenile wandering albatrosses are able to employ similar foraging strategies to those observed in adults, additional skills need to be acquired during the immature period before the efficiency of these behaviors matches that of adults. |
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109 |
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ISSN |
2045-7758 |
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2045-7758 |
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Approved |
yes |
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Call Number |
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Serial |
7158 |
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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 |
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Type |
Journal |
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Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
7 |
Issue |
9 |
Pages |
2969-2976 |
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Keywords |
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Abstract |
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109 |
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2045-7758 |
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2045-7758 |
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yes |
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Call Number |
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Serial |
7163 |
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