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Author |
Fort Jerome, Cherel Yves, Harding Ann M A, Welcker Jorg, Jakubas Dariusz, Steen Harald, Karnovsky Nina J, Gremillet David, |
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Title |
Geographic and seasonal variability in the isotopic niche of little auks
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Journal Article |
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Year |
2010 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal  |
Mar. Ecol. Prog. Ser. |
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Volume |
414 |
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Pages |
293 -302 |
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Keywords |
alcid, annual cycle, copepod, diet, north atlantic, pelagic ecosystem, seabird, |
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Abstract |
The non-breeding season of seabirds is extremely challenging to study because it is often spent offshore under harsh environmental conditions. We used stable isotope analysis to investigate little auk Alle alle feeding ecology throughout the annual cycle. The geographic distribution of little auks in the Arctic covers a wide range of oceanographic conditions. We sampled birds from 5 different colonies located in the most important breeding areas (Greenland and Spitsbergen) to examine how individuals breeding in contrasting marine environments differ in their trophic niche throughout the year. We found differences in summer delta N-15 values among the colonies, suggesting different target species despite low overall delta N-15 values in blood, which indicates a diet that is primarily composed of copepods. A rise in delta N-15 values between summer and autumn indicated that adults changed their trophic status to feed at a higher trophic level. During autumn, a large overlap in feather delta C-13 values between colonies suggests a common moulting area off Northeast Greenland. During winter, the isotopic signatures show that the trophic status of Greenland and Spitsbergen birds differed, with birds from Greenland feeding at low trophic levels (probably mostly on copepods), and birds from Spitsbergen maintaining a higher trophic level. These findings highlight contrasting seasonal and regional diet in little auk populations, and reveal possible population overlaps during the autumn moult. We found substantial trophic variability in little auks, which may indicate unsuspected capabilities to adapt to current, drastic environmental change in the North Atlantic.
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388 |
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0171-8630 |
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yes |
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2405 |
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Hétérier V, David B, De Ridder C, Rigaud T, |
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Title |
Ectosymbiosis is a critical factor in the local benthic biodiversity of the Antarctic deep sea
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Journal Article |
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Year |
2008 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
364 |
Issue |
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Pages |
67-76 |
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Keywords |
Symbiosis · Species diversity · Species abundance · Null models · Cidaroids · Weddell Sea |
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Abstract |
In deep-sea benthic environments, competition for hard substrates is a critical factor in the distribution and diversity of organisms. In this context, the occurrence of biotic substrates in addition to mineral substrates may change the characteristics of sessile fauna. We tested this hypothesis at different localities of the Weddell Sea (Antarctica) by studying the diversity of ectosymbionts living on the spines of cidaroids (echinoids). The presence of cidaroids promoted a higher total specific richness and increased sessile species abundance, but did not change the diversity. Analyses of species distribution suggested that the cidaroids are a favourable habitat for sessile organisms, compared to rocks, but are colonized by relatively specialist sessile species, leaving the unfavourable rock habitat to more generalist species. Therefore, our study highlights the role of some living organisms, such as cidaroids, as key species increasing Antarctic benthic deep-sea species richness through the niche they provide to symbiotic species. |
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1124 |
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0171-8630 |
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yes |
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2823 |
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Author |
Bailleul F, Cotté C, Guinet C, |
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Title |
Mesoscale eddies as foraging area of a deep-diving predator, the southern elephant seal
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Journal Article |
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Year |
2010 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
408 |
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251-264 |
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109 |
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0171-8630 |
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3016 |
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Author |
Péron C, Delord K, Phillips RA, Charbonnier Y, Marteau C, Louzao M, Weimerskirch H, |
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Title |
Seasonal variation in oceanographic habitat and behaviour of white-chinned petrels Procellaria aequinoctialis from Kerguelen Island
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Type |
Journal Article |
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Year |
2010 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
416 |
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Pages |
267-284 |
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109 |
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0171-8630 |
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yes |
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3063 |
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Author |
Halsey LG, Butler PJ, Fahlman A, Bost CA, Handrich Y, |
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Title |
Changes in the foraging dive behaviour and energetics of king penguins through summer and autumn: a month by month analysis
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Journal Article |
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Year |
2010 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
401 |
Issue |
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Pages |
279-289 |
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Abstract |
King penguins Aptenodytes patagonicus are known to change their diving behaviour in
response to changes in both prey location and their breeding status through the early stages of the
breeding cycle (austral summer and autumn). However, little information exists on whether and how
these changes affect the energy expenditure of such behaviour. By deploying heart rate and hydrostatic pressure data loggers, we investigated detailed changes in the dive time budgeting of king penguins during foraging dives across the breeding season, in the same individuals, and the associated changes in estimated oxygen consumption during those dives. Maximum dive depth, duration,
bottom duration, feeding events (indicated by wiggles) per dive and post-dive duration increased
through the study period. While a foraging dive later in the breeding season was energetically more
costly than a dive earlier in the season, the overall rate of energy expenditure did not change, nor did energy cost per unit prey capture. These findings indicate an ability of king penguins to adjust their foraging dive behaviours through the summer and autumn without affecting the energetic costs of diving to capture prey. Such plasticity may be necessary to compensate for changes both in prey location and abundance, and in the energy requirements of the chick over time. |
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394 |
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Inter-Research, Nordbuente 23 Oldendorf/Luhe 21385 Germany |
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0171-8630 |
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3108 |
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Author |
Thiebot JB, Cherel Y, Trathan PN, Bost CA, |
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Title |
Inter-population segregation in the wintering areas of macaroni penguins
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Journal Article |
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Year |
2011 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
421 |
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279-290 |
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109;394 |
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Bachelor's thesis |
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0171-8630 |
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3261 |
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Author |
González-Solís J, Smyrli M, Militão T, Gremillet D, Tveraa T, Phillips RA, Boulinier T, |
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Title |
Combining stable isotope analyses and geolocation to reveal kittiwake migration
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Journal Article |
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Year |
2011 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
435 |
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251-261 |
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333;388 |
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Bachelor's thesis |
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0171-8630 |
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yes |
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3510 |
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Author |
Hemery LG, Galton-Fenzi B, Améziane N, Riddle MJ, Rintoul SR, Beaman RJ, Post AL, Eléaume M, |
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Title |
Predicting habitat preferences for Anthometrina adriani (Echinodermata) on the East Antarctic continental shelf
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Journal Article |
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Year |
2011 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
441 |
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105-116 |
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1124 |
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0171-8630 |
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3726 |
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Author |
Dragon AC, Bar-Hen A, Monestiez P, Guinet C, |
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Title |
Horizontal and vertical movements as predictors of foraging success in a marine predator
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Journal Article |
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Year |
2012 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
447 |
Issue |
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Pages |
243-257 |
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Keywords |
Area-restricted search · Dive classification · Drift dive · Fine-scale behaviour · Movement analysis |
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Abstract |
With technical advances in wildlife telemetry, the study of cryptic predators’ responses to prey distribution has been revolutionised. In the case of marine predators, high resolution tagging devices have been developed recently to collect precise diving datasets covering extended periods of time. In this study, we investigated changes in the horizontal movements and diving patterns of a marine predator, the southern elephant seal, at fine temporal and spatial scales. Satellite tracking data collected for 9 seals were processed with switching state-space models. Seal body condition, as a proxy for foraging success, was estimated through changes in drift rate from Time Depth Recorder (TDR) data. We identified (1) statistically distinct behavioural modes from the tracking data (intensive vs. extensive foraging modes) and (2) distinct dive classes from the TDR diving data (drift, exploratory, shallow active and deep active dives). Active dives, associated with vertical foraging and chasing, were more numerous when the seals were in intensive foraging mode. Improved body condition and mass gain of seals were also associated with the intensive foraging mode and, within the vertical dimension, with sets of highly active dives. In conclusion, proportions of dive classes varied according to seals’ horizontal behaviour. Intensive foraging detected from surface tracking data is a good predictor of diving activity and foraging success occurring in the vertical dimension. |
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0171-8630 |
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3870 |
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Author |
Grmillet D, Welcker J, Karnovsky NJ, Walkusz W, Hall ME, Fort J, Brown ZW, Speakman JR, Harding AMA, |
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Title |
Little auks buffer the impact of current Arctic climate change
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Type |
Journal Article |
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Year |
2012 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
454 |
Issue |
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197-206 |
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Keywords |
Behavioural plasticity · Envelope models · Global warming · North Atlantic · Pelagic food web · Zooplankton |
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Abstract |
Climate models predict a multi-degree warming of the North Atlantic in the 21st century. A research priority is to understand the effect of such changes upon marine organisms. With 40 to 80 million individuals, planktivorous little auks Alle alle are an essential component of pelagic food webs in this region that is potentially highly susceptible to climatic effects. Using an integrative study of their behaviour, physiology and fitness at 3 study sites, we evaluated the effect of ocean warming on little auks across the Greenland Sea in 2005 to 2007. Contrary to our hypothesis, the birds responded to a wide range of sea surface temperatures via plasticity of their foraging behaviour, allowing them to maintain their fitness levels. Predicted effects of climate change are significantly attenuated by such plasticity, confounding attempts to forecast future effects of climate change using envelope models. |
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0171-8630 |
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4082 |
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