Match!

Movements, winter distribution and activity patterns of Falkland and brown skuas: insights from loggers and isotopes

Published on Sep 13, 2007in Marine Ecology Progress Series2.359
· DOI :10.3354/meps06991
Richard A. Phillips50
Estimated H-index: 50
(BAS: British Antarctic Survey),
Paulo Catry31
Estimated H-index: 31
+ 4 AuthorsIan J. Strange18
Estimated H-index: 18
Sources
Abstract
In the first published study of the wintering ranges and activity patterns of skuas from any colony, we combined tracking (geolocator) and stable isotope analysis in a comparison of migra- tion behaviour of brown skuas Catharacta lonnbergi and Falkland skuas C. antarctica from South Georgia and the Falkland Islands, respectively. Brown skuas, particularly failed breeders, departed and returned to the colony much earlier than Falkland skuas, and 2 of 3 brown skuas performed a pre-laying exodus. During winter, brown skuas were distributed widely over deep, oceanic water within the Argentine Basin (37 to 52° S) between the Antarctic Polar Front and the northern sub-trop- ical Front. Falkland skuas, by comparison, wintered mainly in subantarctic waters around the central Patagonian shelf-break (40 to 52° S). Much greater overlap existed among core areas within than between species, and sex did not influence distribution. The partial inter-specific spatial segregation was also reflected in a divergence in activity patterns, with brown skuas in flight for a greater propor- tion, and more time on average, during both daylight and darkness. Both species of skua spent far more time on the water than do foraging albatrosses, and there was limited overlap between their nonbreeding distributions and those of large procellariids from the same archipelagos. Stable isotope signatures of brown skua feathers indicated that distributions of tracked birds were typical of most or all of the breeding population, and were consistent from year to year. None was characteristic of species that winter on adjacent continental shelves or off south-west Europe. Isotope values also sug- gested a mixed diet for brown skuas of zooplankton, low trophic-level squid and fish, with little or no reliance on seabird predation or fisheries.
Figures & Tables
  • References (34)
  • Citations (82)
📖 Papers frequently viewed together
366 Citations
199 Citations
180 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
References34
Newest
#2Rosemary Gales (Parks and Wildlife Service)H-Index: 10
#3April Hedd (UTAS: University of Tasmania)H-Index: 5
Last. Graham Robertson (AAD: Australian Antarctic Division)H-Index: 25
view all 3 authors...
Satellite telemetry was used to identify the foraging zones of Shy Albatrosses Diomedea cauta breeding at two sites off Tasmania, Australia (Albatross Island in western Bass Strait and Pedra Branca to the south) to assess their level of interaction with longline fisheries. Adult birds from both colonies fed locally both in and outside the breeding season. Breeding birds from Albatross Island foraged over the Australian continental shelf or slope waters off northwest Tasmania, while those from Pe...
93 CitationsSource
#1Ben Phalan (University of Cambridge)H-Index: 26
#2Richard A. PhillipsH-Index: 50
Last. John P. CroxallH-Index: 40
view all 9 authors...
We integrated information from satellite transmitters, GPS loggers and wet/dry activity loggers to compare the at-sea behaviour of 4 sympatric albatross species by night and day: wander- ing Diomedea exulans, grey-headed Thalassarche chrysostoma, black-browed T. melanophrys and light-mantled sooty Phoebetria palpebrata (in total, 350 foraging trips by 101 individuals). Trip dura- tion, distance and maximum range varied more within species between stages (incubation, brood- guard and post-brood) ...
99 CitationsSource
Electronic tracking tags have revolutionized our understanding of broad-scale movements and habitat use of highly mobile marine animals, but a large gap in our knowledge still remains for a wide range of small species. Here, we report the extraordinary transequatorial postbreeding migrations of a small seabird, the sooty shearwater, obtained with miniature archival tags that log data for estimating position, dive depth, and ambient temperature. Tracks (262 ± 23 days) reveal that shearwaters fly ...
359 CitationsSource
#1Yves Cherel (CNRS: Centre national de la recherche scientifique)H-Index: 62
#2Richard A. Phillips (BAS: British Antarctic Survey)H-Index: 50
Last. Rona A. R. McGill (Scottish Enterprise)H-Index: 25
view all 4 authors...
Although there is increasing evidence that climatic variations during the non-breeding season shape population dynamics of seabirds, most aspects of their winter distribution and ecology remain essentially unknown. We used stable isotope signatures in feathers to infer and compare the moulting (wintering) habitat of subantarctic petrels breeding at two distant localities (South Georgia and Kerguelen). Petrels showed species-specific wintering habitat preferences, with a similar pattern of latitu...
94 CitationsSource
#1Martin-Alejandro Serrano-Meneses (University of Bath)H-Index: 1
#2Tamás SzékelyH-Index: 48
Seabirds exhibit a range of sexual size dimorphism (SSD) that includes both male-biased (males > females) and female-biased SSD (males < females). Here we use phylogenetic comparative methods to test the selective processes that may influence their SSD. Using phylogenetically independent contrasts we show that the sizes of males and females are scaled isometrically in seabirds. We also test three functional hypotheses of SSD: sexual selection, fecundity selection and differential niche-utilisati...
56 CitationsSource
#1Richard A. Phillips (NERC: Natural Environment Research Council)H-Index: 50
#2Janet R. D. Silk (NERC: Natural Environment Research Council)H-Index: 15
Last. Vsevolod Afanasyev (NERC: Natural Environment Research Council)H-Index: 28
view all 4 authors...
The white-chinned petrel Procellaria aequinoctialis is a medium-sized procellariiform with a circumpolar subAntarctic breeding distribution. Feeding during both day and night, and often competing aggressively for bait, offal and discards, it has the highest incidental mortality rate of any seabird in Southern Ocean longline fisheries. Although still abundant, the limited census data suggest rapid population declines. Using geolocators, the movements of 10 white-chinned petrels from South Georgia...
180 CitationsSource
#1Stuart Bearhop ('QUB': Queen's University Belfast)H-Index: 51
#2Richard A. PhillipsH-Index: 50
Last. John P. CroxallH-Index: 40
view all 6 authors...
An important aspect of foraging ecology is the extent to which different individuals or genders within a population exploit food resources in a different manner. For diving seabirds, much of this information relates either to short-term dietary data or indirect measures such as time budgets. Moreover, dietary specialisation can be difficult to detect due to biases associated with conventional sampling techniques. We used stable isotope ratios in blood and feathers to infer trophic and habitat sp...
172 CitationsSource
#1Richard A. Phillips (NERC: Natural Environment Research Council)H-Index: 50
#2Janet R. D. Silk (NERC: Natural Environment Research Council)H-Index: 15
Last. Victoria J. Bennett (NERC: Natural Environment Research Council)H-Index: 1
view all 5 authors...
Many birds show a surprising degree of intraspecific variability in migratory tendency and choice of wintering site. In this study, we tracked the seasonal movements of 35 nonbreeding Black-browed Albatrosses Thalassarche melanophrys from South Georgia, including 24 birds followed in two consecutive years. This revealed consistent patterns of status-related, sex-specific, and individual variation in wintering strategies, and provided the first description of the summer distribution of failed/def...
199 CitationsSource
#1John P. CroxallH-Index: 40
#2Janet R. D. SilkH-Index: 15
Last. D. R. BriggsH-Index: 12
view all 5 authors...
Although albatrosses are paradigms of oceanic specialization, their foraging areas and migration routes when not breeding remain essentially unknown. Our continuous remote tracking of 22 adult gray-headed albatrosses for over 30 bird-years reveals three distinct strategies: (i) Stay in breeding home range; (ii) make return migrations to a specific area of the southwest Indian Ocean; and (iii) make one or more global circumnavigations (the fastest in just 46 days). The consistencies in patterns, ...
233 CitationsSource
#1José C. Xavier (University of Cambridge)H-Index: 26
#2Philip N. Trathan (NERC: Natural Environment Research Council)H-Index: 45
Last. Paul G. Rodhouse (NERC: Natural Environment Research Council)H-Index: 43
view all 6 authors...
Knowledge about the areas used by the foraging wandering albatross, Diomedea exulans, its prey and overlap with longline fisheries is important information not only for the conservation of this species but also for furthering our understanding of the ecology of its prey. We attached satellite-tracking devices and activity recorders to wandering albatrosses between May and July of 1999 and 2000 (years of differing food availability around South Georgia) in order to assess inter-annual variation i...
84 CitationsSource
Cited By82
Newest
#2Diego MontaltiH-Index: 10
Last. Martín AnsaldoH-Index: 13
view all 3 authors...
Source
#1Maëlle Connan (UCT: University of Cape Town)H-Index: 11
#2Ben J. Dilley (UCT: University of Cape Town)H-Index: 8
Last. Peter G. Ryan (UCT: University of Cape Town)H-Index: 50
view all 6 authors...
A central theme in community ecology is understanding how similar species co‐exist and how their interactions may evolve in the context of climate change. Most studies of resource partitioning among central place foragers, particularly birds, focus on the offspring‐rearing period, when they are accessible, but breeding success may be determined earlier and little is known about how such species partition resources at the onset of breeding. We used a non‐invasive approach to evaluate resource par...
Source
#1Aurore Ponchon (Aberd.: University of Aberdeen)H-Index: 8
#2Thomas Cornulier (Aberd.: University of Aberdeen)H-Index: 15
Last. Paulo Catry (International Sleep Products Association)H-Index: 31
view all 5 authors...
Funding Information Fundacao para Ciencia e a Tecnologica (FCT Portugal). Grant Numbers: IF/00502/2013/CP1186/CT0003, UID/AMB/50017/2019, MAREUID/MAR/04292/2019 Marie Sklodowska‐Curie grant. Grant Number: 753420 Agreement on the Conservation of Albatrosses and Petrels. Grant Number: 2013-14
Source
#1Paloma Borghello (CONICET: National Scientific and Technical Research Council)
#2Diego Sebastián Torres (CONICET: National Scientific and Technical Research Council)
Last. Andrés E. Ibañez (CONICET: National Scientific and Technical Research Council)H-Index: 9
view all 4 authors...
Top predators exhibit a critical role in ecosystem functioning and in the stability of the food web, so research on diet is relevant to understand their foraging behavior. Seasonal variation in diet and prey selection may be the result of fluctuations in the physiological demands during the different annual life cycles, and ecological factors such as resource availability, which may influence the foraging behavior. Moreover, the competition for the feeding territories between conspecifics in a p...
Source
#1Dariusz Jakubas (University of Gdańsk)H-Index: 20
#2Lech Iliszko (University of Gdańsk)H-Index: 10
Last. Lech Stempniewicz (University of Gdańsk)H-Index: 22
view all 5 authors...
Foraging strategies of seabird species often vary considerably between and within individuals. This variability is influenced by a multitude of factors including age, sex, stage of annual life cycle, reproductive status, individual specialization and environmental conditions. Using GPS-loggers, we investigated factors affecting foraging flight characteristics (total duration, maximal range, total distance covered) of great skuas Stercorarius skua of known sex breeding on Bjornoya, Svalbard, the ...
1 CitationsSource
#1Isabel Afán (CSIC: Spanish National Research Council)H-Index: 11
#2Joan Giménez (CSIC: Spanish National Research Council)H-Index: 13
Last. Francisco Ramírez (University of Barcelona)H-Index: 14
view all 4 authors...
: Identifying priority areas for biodiversity conservation is particularly challenging in the marine environment due to the open and dynamic nature of the ocean, the paucity of information on species distribution, and the necessary balance between marine biodiversity conservation and essential supporting services such as seafood provision. We used the Patagonian seabird breeding community as a case study to propose an integrated and adaptive method for delimiting key marine areas for conservatio...
Source
#1Raül Ramos (University of Barcelona)H-Index: 16
#2Victoria Llabrés (University of Barcelona)H-Index: 1
Last. Jacob González-Solís (University of Barcelona)H-Index: 37
view all 5 authors...
Life history theory states that individual fitness in one stage of life is conditioned by what occurred in previous stages. In migratory species, reproductive effort during breeding has often been found to influence body condition, molt schedule, self‐provisioning and migration of individuals in subsequent seasons (i.e., carryover effects of breeding). However, there is a current uncertainty in understanding how long‐distance migrants trade off among such energy‐demanding activities (i.e., breed...
3 CitationsSource
#1Amélie A. AugéH-Index: 1
#2Maria P. Dias (BirdLife International)H-Index: 20
Last. John P. Croxall (BirdLife International)H-Index: 21
view all 25 authors...
Abstract Marine Spatial Planning (MSP) is becoming a key management approach throughout the world. The process includes the mapping of how humans and wildlife use the marine environment to inform the development of management measures. An integrated multi-species approach to identifying key areas is important for MSP because it allows managers a global representation of an area, enabling them to see where management can have the most impact for biodiversity protection. However, multi-species ana...
10 CitationsSource
#1Yutaka Watanuki (Hokkaido University)H-Index: 37
#2Jean-Baptiste Thiebot (National Institute of Polar Research)H-Index: 12
Mesopelagic myctophid fish are a key component of the world’s ocean food webs, linking primary consumers and predators. Among marine predators, seabirds are globally significant consumers, but the extent to which they feed on myctophids has been investigated only at the regional scale. This global-scale review of analyses of the stomach contents of 228 seabird species reveals that the occurrence of myctophids in seabird diets is extremely variable. However, myctophids do constitute a considerabl...
2 CitationsSource
#1Andrés E. Ibañez (CONICET: National Scientific and Technical Research Council)H-Index: 9
#2Maricel Graña Grilli (CONICET: National Scientific and Technical Research Council)H-Index: 3
Last. Diego Montalti (CONICET: National Scientific and Technical Research Council)H-Index: 10
view all 5 authors...
During breeding, Brown Skuas (Stercorarius antarcticus lonnbergi) perform a great physical effort in the care and maintenance of the nest. Interestingly, the breeding colony on which this work was conducted is in steady decline in recent years. In order to understand the physiological background responsible for the trade off between reproductive effort and health status, in adults and the possible reasons for the colony decline, we evaluated the health status in Brown Skuas parents and growing c...
2 CitationsSource