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Title |
Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems |
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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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Programme |
109,394 |
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Bachelor's thesis |
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ISSN |
2045-7758 |
ISBN  |
2045-7758 |
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yes |
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Call Number |
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Serial |
7114 |
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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 |
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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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Serial |
7154 |
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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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2045-7758 |
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2045-7758 |
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yes |
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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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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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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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Title |
Exposing the structure of an Arctic food web |
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Journal |
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Year |
2015 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
5 |
Issue |
17 |
Pages |
3842-3856 |
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Keywords |
Calidris DNA barcoding generalism Greenland Hymenoptera molecular diet analysis Pardosa Plectrophenax specialism Xysticus |
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Abstract |
Abstract How food webs are structured has major implications for their stability and dynamics. While poorly studied to date, arctic food webs are commonly assumed to be simple in structure, with few links per species. If this is the case, then different parts of the web may be weakly connected to each other, with populations and species united by only a low number of links. We provide the first highly resolved description of trophic link structure for a large part of a high-arctic food web. For this purpose, we apply a combination of recent techniques to describing the links between three predator guilds (insectivorous birds, spiders, and lepidopteran parasitoids) and their two dominant prey orders (Diptera and Lepidoptera). The resultant web shows a dense link structure and no compartmentalization or modularity across the three predator guilds. Thus, both individual predators and predator guilds tap heavily into the prey community of each other, offering versatile scope for indirect interactions across different parts of the web. The current description of a first but single arctic web may serve as a benchmark toward which to gauge future webs resolved by similar techniques. Targeting an unusual breadth of predator guilds, and relying on techniques with a high resolution, it suggests that species in this web are closely connected. Thus, our findings call for similar explorations of link structure across multiple guilds in both arctic and other webs. From an applied perspective, our description of an arctic web suggests new avenues for understanding how arctic food webs are built and function and of how they respond to current climate change. It suggests that to comprehend the community-level consequences of rapid arctic warming, we should turn from analyses of populations, population pairs, and isolated predator?prey interactions to considering the full set of interacting species. |
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1036 |
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ISSN |
2045-7758 |
ISBN |
2045-7758 |
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yes |
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Call Number |
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Serial |
7282 |
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Title |
Effects of food abundance and early clutch predation on reproductive timing in a high Arctic shorebird exposed to advancements in arthropod abundance |
Type |
Journal |
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Year |
2016 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
6 |
Issue |
20 |
Pages |
7375-7386 |
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Keywords |
Bird migration Calidris alba chick growth climate change nest survival phenology timing trophic interactions trophic mismatch |
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Abstract |
Climate change may influence the phenology of organisms unequally across trophic levels and thus lead to phenological mismatches between predators and prey. In cases where prey availability peaks before reproducing predators reach maximal prey demand, any negative fitness consequences would selectively favor resynchronization by earlier starts of the reproductive activities of the predators. At a study site in northeast Greenland, over a period of 17 years, the median emergence of the invertebrate prey of Sanderling Calidris alba advanced with 1.27 days per year. Yet, over the same period Sanderling did not advance hatching date. Thus, Sanderlings increasingly hatched after their prey was maximally abundant. Surprisingly, the phenological mismatches did not affect chick growth, but the interaction of the annual width and height of the peak in food abundance did. Chicks grew especially better in years when the food peak was broad. Sanderling clutches were most likely to be depredated early in the season, which should delay reproduction. We propose that high early clutch predation may favor a later reproductive timing. Additionally, our data suggest that in most years food was still abundant after the median date of emergence, which may explain why Sanderlings did not advance breeding along with the advances in arthropod phenology. |
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1036 |
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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 |
7306 |
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Title |
Experimental stress during molt suggests the evolution of condition-dependent and condition-independent ornaments in the king penguin |
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Journal |
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Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
8 |
Issue |
2 |
Pages |
1084-1095 |
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Keywords |
Corticosterone honest signal Immunity sexual selection social selection |
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Abstract |
Sexual selection and social selection are two important theories proposed for explaining the evolution of colorful ornamental traits in animals. Understanding signal honesty requires studying how environmental and physiological factors during development influence the showy nature of sexual and social ornaments. We experimentally manipulated physiological stress and immunity status during the molt in adult king penguins (Aptenodytes patagonicus), and studied the consequences of our treatments on colourful ornaments (yellow-orange and UV beak spots and yellow-orange auricular feather patches) known to be used in sexual and social contexts in this species. Whereas some ornamental features showed strong condition-dependence (yellow auricular feather chroma, yellow and UV chroma of the beak), others were condition-independent and remained highly correlated before and after the molt (auricular patch size and beak UV hue). Our study provides a rare examination of the links between ornament determinism and selection processes in the wild. We highlight the coexistence of ornaments costly to produce that may be honest signals used in mate choice, and ornaments for which honesty may be enforced by social mediation or rely on genetic constraints. |
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119 |
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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 |
7370 |
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Author |
Florian Orgeret, Sam L. Cox, Henri Weimerskirch, Christophe Guinet |
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Title |
Body condition influences ontogeny of foraging behavior in juvenile southern elephant seals |
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Journal |
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Year |
2019 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
9 |
Issue |
1 |
Pages |
223-236 |
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Keywords |
accelerometers diving behavior early-life first-year juveniles foraging behavior ontogeny satellite relay tags southern elephant seals |
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Abstract |
Ontogeny of diving and foraging behavior in marine top predators is poorly understood despite its importance in population recruitment. This lack of knowledge is partly due to the difficulties of monitoring juveniles in the wild, which is linked to high mortality early in life. Pinnipeds are good models for studying the development of foraging behaviors because juveniles are large enough to robustly carry tracking devices for many months. Moreover, parental assistance is absent after a juvenile departs for its first foraging trip, minimizing confounding effects of parental input on the development of foraging skills. In this study, we tracked 20 newly weaned juvenile southern elephant seals from Kerguelen Islands for up to 338 days during their first trip at sea following weaning. We used a new generation of satellite relay tags, which allow for the transmission of dive, accelerometer, and location data. We also monitored, at the same time, nine adult females from the colony during their post-breeding trips, in order to compare diving and foraging behaviors. Juveniles showed a gradual improvement through time in their foraging skills. Like adults females, they remarkably adjusted their swimming effort according to temporal changes in buoyancy (i.e., a proxy of their body condition). They also did not appear to exceed their aerobic physiological diving limits, although dives were constrained by their smaller size compared to adults. Changes in buoyancy appeared to also influence their decision to either keep foraging or return to land, alongside the duration of their haul outs and choice of foraging habitat (oceanic vs. plateau). Further studies are thus needed to better understand how patterns in juveniles survival, and therefore elephant seal populations, might be affected by their changes in foraging skills and changes in their environmental conditions. |
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109,1201 |
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Thesis |
Bachelor's thesis |
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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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7463 |
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Year |
2023 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
13 |
Issue |
12 |
Pages |
e10796 |
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Programme |
1182 |
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2045-7758 |
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yes |
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Call Number |
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Serial |
8745 |
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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 |
Flipper strokes can predict energy expenditure and locomotion costs in free-ranging northern and Antarctic fur seals |
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Journal |
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Year |
2016 |
Publication |
Scientific reports |
Abbreviated Journal |
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Volume |
6 |
Issue |
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Pages |
33912 |
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Programme |
109 |
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ISSN |
2045-2322 |
ISBN |
2045-2322 |
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yes |
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Call Number |
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Serial |
6604 |
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| Permanent link to this record |
