Journal articles: 'Migratory seabird'

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Rodrigues, Regiane da Silva, Vivian de Mello Cionek, André Silva Barreto, and Joaquim Olinto Branco. "Seabird strandings on the Brazilian coast: What influences spatial and temporal patterns?" PLOS ONE 20, no. 4 (2025): e0317335. https://doi.org/10.1371/journal.pone.0317335.

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Seabirds exhibit physiological adaptations that allow them to forage in the marine environment and undertake long-distance migrations during non-reproductive periods. As a result, they face various natural and anthropogenic pressures, which can lead to extreme fatigue and even death. Stranded bodies that float in the sea can wash ashore, providing valuable ecological information. This study aimed to analyze seabird strandings along the south and southeast coasts of Brazil between 2016 and 2019, focusing on spatiotemporal and potential environmental and anthropogenic influences. Using data from the Santos Basin Beach Monitoring Project, we calculated ecological indices of abundance, richness, and diversity for the entire seabird community and separately by migratory behavior (resident, southern migratory, northern migratory). Statistical modeling revealed a strong decreasing trend in strandings from south to north, with higher events on the southern coast (Santa Catarina and Paraná) and lower on the southeast coast (São Paulo). Resident species and northern migratory species showed peak strandings in spring, while southern migratory peaked in winter. These spatial and temporal patterns reflected birds’ home ranges, reproductive cycles, and migratory behaviors. Environmental variables influenced strandings differently depending on species migration behavior and ecological indices, highlighting the role of oceanographic processes in carcass drift and the impact of climatic events on species mortality. This study is the first to demonstrate a spatiotemporal pattern of seabird strandings on the Brazilian coast, providing valuable insights into seabird dynamics in the Santos Basin and offering important data for conservation efforts.

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Grecian, W. James, Matthew J. Witt, Martin J. Attrill, et al. "Seabird diversity hotspot linked to ocean productivity in the Canary Current Large Marine Ecosystem." Biology Letters 12, no. 8 (2016): 20160024. http://dx.doi.org/10.1098/rsbl.2016.0024.

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Upwelling regions are highly productive habitats targeted by wide-ranging marine predators and industrial fisheries. In this study, we track the migratory movements of eight seabird species from across the Atlantic; quantify overlap with the Canary Current Large Marine Ecosystem (CCLME) and determine the habitat characteristics that drive this association. Our results indicate the CCLME is a biodiversity hotspot for migratory seabirds; all tracked species and more than 70% of individuals used this upwelling region. Relative species richness peaked in areas where sea surface temperature averaged between 15 and 20°C, and correlated positively with chlorophyll a , revealing the optimum conditions driving bottom-up trophic effects for seabirds. Marine vertebrates are not confined by international boundaries, making conservation challenging. However, by linking diversity to ocean productivity, our research reveals the significance of the CCLME for seabird populations from across the Atlantic, making it a priority for conservation action.

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Fey, Jésica Daniela, Tatiana da Silva Neves, Kleber Barrionuevo Baraldo, and Fabiano Peppes. "A preliminary analysis of the distribution and spatial/temporal patterns of seabirds in the Laje de Santos Marine State Park (Santos, Brazil) and surrounding waters." Brazilian Journal of Oceanography 65, no. 4 (2017): 576–87. http://dx.doi.org/10.1590/s1679-87592017129206504.

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Abstract This study investigates the temporal taxonomic variation of the seabird community, and the spatial distributions of seabirds in the Laje de Santos Marine State Park (PEMLS) and surrounding waters, based on shipboard surveys. The increase in the number of seabird taxa during winter is associated to the presence of migratory birds from the south. During summer, only resident species were observed within the park. Analysis of the spatial distributions of taxa using geographic information systems (GIS) identified three different regions within the study area. The first was close to the coast, where birds interact with fishing activities in search for food; the second was the nesting area that provides shelter for the breeding colonies; and the third, which is farther offshore and more exposed, where a higher number of migratory birds were observed during winter surveys. The PEMLS and surrounding waters have characteristics that are important for the study and preservation of seabirds in Brazil and for the South Atlantic Ocean.

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Huang, Ryan M., Oron L. Bass Jr, and Stuart L. Pimm. "Sooty tern (Onychoprion fuscatus) survival, oil spills, shrimp fisheries, and hurricanes." PeerJ 5 (May 10, 2017): e3287. http://dx.doi.org/10.7717/peerj.3287.

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Migratory seabirds face threats from climate change and a variety of anthropogenic disturbances. Although most seabird research has focused on the ecology of individuals at the colony, technological advances now allow researchers to track seabird movements at sea and during migration. We combined telemetry data on Onychoprion fuscatus (sooty terns) with a long-term capture-mark-recapture dataset from the Dry Tortugas National Park to map the movements at sea for this species, calculate estimates of mortality, and investigate the impact of hurricanes on a migratory seabird. Included in the latter analysis is information on the locations of recovered bands from deceased individuals wrecked by tropical storms. We present the first known map of sooty tern migration in the Atlantic Ocean. Our results indicate that the birds had minor overlaps with areas affected by the major 2010 oil spill and a major shrimp fishery. Indices of hurricane strength and occurrence are positively correlated with annual mortality and indices of numbers of wrecked birds. As climate change may lead to an increase in severity and frequency of major hurricanes, this may pose a long-term problem for this colony.

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Michelutti, Neal, Bronwyn E. Keatley, Samantha Brimble, et al. "Seabird-driven shifts in Arctic pond ecosystems." Proceedings of the Royal Society B: Biological Sciences 276, no. 1656 (2008): 591–96. http://dx.doi.org/10.1098/rspb.2008.1103.

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Migratory animals such as seabirds, salmon and whales can transport large quantities of nutrients across ecosystem boundaries, greatly enriching recipient food webs. As many of these animals biomagnify contaminants, they can also focus pollutants at toxic levels. Seabirds arguably represent the most significant biovectors of nutrients and contaminants from the ocean to the land, given their sheer numbers and global distribution. However, long-term census data on seabirds are rare. Using palaeolimnological proxies, we show that a colony of Arctic seabirds has experienced climate-induced population increases in recent decades. We then document increasing concentrations of contaminants, including polychlorinated biphenyls and cadmium, in pond sediments that are linked to biotransport by seabirds. Our findings suggest that climate-related shifts in global seabird populations will have the unexpected consequence of restructuring coastal ecosystems.

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Wong, JB, S. Lisovski, RT Alisauskas, et al. "Arctic terns from circumpolar breeding colonies share common migratory routes." Marine Ecology Progress Series 671 (August 5, 2021): 191–206. http://dx.doi.org/10.3354/meps13779.

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The Arctic tern is an iconic seabird, famous for its annual migrations between the Arctic and the Antarctic. Its wide geographical range has impeded knowledge of potential population bottlenecks during its annual bi-hemispheric movements. Although Arctic terns breed in the Pacific, Atlantic, and Arctic coasts of North America, few tracking studies have been conducted on North American Arctic terns, and none in Canada, which represents a significant proportion of their circumpolar breeding range. Using light-level geolocators, we tracked 53 Arctic terns from 5 breeding colonies across a wide latitudinal and longitudinal range within North America. We compared the routes taken by birds in our study and migration timing to those previously tracked from Greenland, Iceland, The Netherlands, Sweden, Norway, Maine (USA), and S. Alaska (USA). Most Arctic terns tracked globally used one of 3 southbound migration routes: (1) Atlantic West Africa; (2) Atlantic Brazil; and (3) Pacific coastal, and one of 2 northbound migration routes: (1) Mid-ocean Atlantic and (2) Mid-ocean Pacific. Some other trans-equatorial seabirds also used these migration routes, suggesting that Arctic tern routes may be important for other species. The migration timing for southbound and northbound migrations was generally different between tracked tern colonies worldwide but generally fell within a 1-2 mo window. Our research suggests that conservation management of Arctic terns during their migration should dynamically adapt with the times of the year that terns use parts of their route. Future identification of common multi-species seabird flyways could aid the international negotiations required to conserve pelagic seabirds such as Arctic terns.

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Pope, Peter E. "Early Migratory Fishermen and Newfoundland's Seabird Colonies." Journal of the North Atlantic 2009, sp1 (2009): 57. http://dx.doi.org/10.3721/037.002.s107.

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Quillfeldt, Petra, Christian C. Voigt, and Juan F. Masello. "Plasticity versus repeatability in seabird migratory behaviour." Behavioral Ecology and Sociobiology 64, no. 7 (2010): 1157–64. http://dx.doi.org/10.1007/s00265-010-0931-2.

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Rail, Jean-François, and Richard Cotter. "Seventeenth census of seabird populations in the sanctuaries of the North Shore of the Gulf of St. Lawrence, 2010." Canadian Field-Naturalist 129, no. 2 (2015): 152. http://dx.doi.org/10.22621/cfn.v129i2.1695.

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Seabirds in the 10 migratory bird sanctuaries of the North Shore of the Gulf of St. Lawrence, Quebec, Canada, which were created in 1925, have been censused regularly for the last 85 years. The sanctuaries support 16 seabird species, many of which are found in significant numbers. From 2005 to 2010, some notable population changes were observed: large increases in Common Murres (Uria aalge), Razorbills (Alca torda), and two species of cormorants and continuing declines in Black-legged Kittiwakes (Rissa tridactyla) and Atlantic Puffins (Fratercula arctica). The status of Leach’s Storm-Petrel (Oceanodroma leucorhoa) and Caspian Tern (Hydroprogne caspia) is extremely precarious because of their small breeding populations. Between 2005 and 2010, seabird numbers in the sanctuaries increased 19% overall and were stable in most sanctuaries (≤ 15% change); however, notable increases were observed at Îles Sainte-Marie (60%), Baie des Loups (47%), and Île à la Brume (44%). Nonetheless, considering historical records, increased surveillance and raising of awareness of seabird conservation in local communities near the sanctuaries of Île à la Brume, Baie des Loups, and Saint-Augustin would be most beneficial.

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Rail, Jean-François. "Eighteenth census of seabirds breeding in the sanctuaries of the North Shore of the Gulf of St. Lawrence, 2015." Canadian Field-Naturalist 135, no. 3 (2022): 221–33. http://dx.doi.org/10.22621/cfn.v135i3.2675.

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In 1925, ten migratory bird sanctuaries were created on the North Shore of the Gulf of St. Lawrence, and their breeding seabird populations have been censused every five years since. Between 2010 and 2015, only three alcid species exhibited positive population trends (Razorbill [Alca torda], Common Murre [Uria aalge], and Atlantic Puffin [Fratercula arctica]), while the remaining 13 species showed declining trends. Leach’s Storm-Petrel (Hydrobates leucorhous) and Caspian Tern (Hydroprogne caspia) are on the verge of disappearing from the sanctuaries, and the prolonged and rapid decline in Black-legged Kittiwake (Rissa tridactyla) is worrisome. Based on historical records since 1925, it appears that seabird communities are faring well in some sanctuaries (e.g., Baie de Brador, Îles aux Perroquets, and Îles Sainte-Marie), while numbers are at low levels in others (e.g., Île à la Brume, Baie des Loups, and Saint-Augustin). Human disturbance, harvest of seabirds (eggs and birds), and predation are among the issues potentially most affecting seabird populations on the North Shore of the Gulf of St. Lawrence.

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Morley, Tim, Annette Fayet, Helene Jessop, et al. "The seabird wreck in the Bay of Biscay and South-Western Approaches in 2014: A review of reported mortality." Seabird Journal, no. 29 (2016): 22–38. http://dx.doi.org/10.61350/sbj.29.22.

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Between December 2013 and February 2014, a series of storm events occurred in areas of the North Atlantic frequented by migratory seabirds. Prolonged exposure to sustained storm conditions was followed by an unprecedented level of seabird mortality, apparently due to starvation, exhaustion and drowning. A total of 54,982 wrecked birds was recorded along European coastlines of the North-East Atlantic over the winter; 94% of which were dead. The majority of birds found were recorded on the French coastline (79.6%), and the most impacted species was the Atlantic Puffin Fratercula arctica (53.5%). In this paper, we describe the conditions surrounding this wreck event and report the numbers of wrecked and stranded seabirds by combining reports from multiple affected countries.

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Michael, Pamela E., Kathy M. Hixson, Jeffery S. Gleason, J. Christopher Haney, Yvan G. Satgé, and Patrick G. R. Jodice. "Migration, breeding location, and seascape shape seabird assemblages in the northern Gulf of Mexico." PLOS ONE 18, no. 6 (2023): e0287316. http://dx.doi.org/10.1371/journal.pone.0287316.

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The Gulf of Mexico supports many seabird species, yet data gaps describing species composition and habitat use are prevalent. We used vessel-based observations from the Gulf of Mexico Marine Assessment Program for Protected Species to identify and characterize distinct seabird assemblages in the northern Gulf of Mexico (within the U.S. Exclusive Economic Zone; nGoM). Using cluster analysis of 17 seabird species, we identified assemblages based on seabird relative density. Vessel-based surveys documented the location, species, and number of seabirds across the nGoM between 2017–2019. For each assemblage, we identified the (co-)dominant species, spatial distribution, and areas of greater relative density. We also assessed the relationship of the total relative density within each assemblage with environmental, spatial, and temporal covariates. Of the species assessed, 76% (n = 13) breed predominantly outside the nGoM basin. We identified four seabird assemblages. Two assemblages, one dominated by black tern and the other co-dominated by northern gannet/laughing gull, occurred on the continental shelf. An assemblage dominated by sooty tern occurred along the continental slope into pelagic waters. The fourth assemblage had no dominant species, was broadly distributed, and was composed of observations with low relative density (‘singles’ assemblage). Differentiation of assemblages was linked to migratory patterns, residency, and breeding location. The spatial distributions and relationships of the black tern and northern gannet/laughing gull assemblages with environmental covariates indicate associations with river outflows and ports. The sooty tern assemblage overlapped an area prone to mesoscale feature formation. The singles assemblage may reflect commuting and dispersive behaviors. These findings highlight the importance of seasonal migrations and dynamic features across the seascape, shaping seabird assemblages. Considering the potential far-ranging effects of interactions with seabirds in the nGoM, awareness of these unique patterns and potential links with other fauna could inform future monitoring, research, restoration, offshore energy, and aquaculture development in this highly industrialized sea.

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Kürten, Nathalie, Heiko Schmaljohann, Coraline Bichet, et al. "High individual repeatability of the migratory behaviour of a long-distance migratory seabird." Movement Ecology 10 (February 5, 2022): 5 (2022). https://doi.org/10.5281/zenodo.6088726.

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Abstract Background: Understanding the evolution of migration requires knowledge of the patterns, sources, and consequences of variation in migratory behaviour, a need exacerbated by the fact that many migratory species show rapid population declines and require knowledge-based conservation measures. We therefore need detailed knowledge on the spatial and temporal distribution of individuals across their annual cycle, and quantify how the spatial and temporal components of migratory behaviour vary within and among individuals. Methods: We tracked 138 migratory journeys undertaken by 64 adult common terns (Sterna hirundo) from a breeding colony in northwest Germany to identify the annual spatiotemporal distribution of these birds and to evaluate the individual repeatability of eleven traits describing their migratory behaviour. Results: Birds left the breeding colony early September, then moved south along the East Atlantic Flyway. Wintering areas were reached mid-September and located at the west and south coasts of West Africa as well as the coasts of Namibia and South Africa. Birds left their wintering areas late March and reached the breeding colony mid-April. The timing, total duration and total distance of migration, as well as the location of individual wintering areas, were moderately to highly repeatable within individuals (repeatability indexes: 0.36–0.75, 0.65–0.66, 0.93–0.94, and 0.98–1.00, respectively), and repeatability estimates were not strongly affected by population-level inter-annual variation in migratory behaviour. Conclusions: We found large between-individual variation in common tern annual spatiotemporal distribution and strong individual repeatability of several aspects of their migratory behaviour.

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Fromant, Aymeric, Charles-André Bost, Paco Bustamante, et al. "Temporal and spatial differences in the post-breeding behaviour of a ubiquitous Southern Hemisphere seabird, the common diving petrel." Royal Society Open Science 7, no. 11 (2020): 200670. http://dx.doi.org/10.1098/rsos.200670.

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The non-breeding period plays a major role in seabird survival and population dynamics. However, our understanding of the migratory behaviour, moulting and feeding strategies of non-breeding seabirds is still very limited, especially for small-sized species. The present study investigated the post-breeding behaviour of three distant populations (Kerguelen Archipelago, southeastern Australia, New Zealand) of the common diving petrel (CDP) ( Pelecanoides urinatrix ), an abundant, widely distributed zooplanktivorous seabird breeding throughout the southern Atlantic, Indian and Pacific oceans. The timing, geographical destination and activity pattern of birds were quantified through geolocator deployments during the post-breeding migration, while moult pattern of body feathers was investigated using stable isotope analysis. Despite the high energetic cost of flapping flight, all the individuals quickly travelled long distances (greater than approx. 2500 km) after the end of the breeding season, targeting oceanic frontal systems. The three populations, however, clearly diverged spatially (migration pathways and destinations), and temporally (timing and duration) in their post-breeding movements, as well as in their period of moult. Philopatry to distantly separated breeding grounds, different breeding phenologies and distinct post-breeding destinations suggest that the CDP populations have a high potential for isolation, and hence, speciation. These results contribute to improving knowledge of ecological divergence and evolution between populations, and inform the challenges of conserving migratory species.

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Yamamoto, Takashi, Akinori Takahashi, Katsufumi Sato, Nariko Oka, Maki Yamamoto, and Philip N. Trathan. "Individual consistency in migratory behaviour of a pelagic seabird." Behaviour 151, no. 5 (2014): 683–701. http://dx.doi.org/10.1163/1568539x-00003163.

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Many animals migrate between breeding and wintering areas; however, whether each animal behaves consistently in space and time between consecutive years is less well understood. Furthermore, previous breeding state (successful or failed) is often not considered when attempting to understand consistent individual differences in behaviour that are likely to impact upon the subsequent behaviour. Between 2006 and 2010, we used geolocators to track the migratory movements of a pelagic seabird, the streaked shearwater Calonectris leucomelas, with individuals () being followed for two years or more, including 23 birds that had chicks in two seasons and 23 birds in just one season. All individuals, except for one bird, migrated to the same broad wintering areas, and their migratory route as well as the centre of wintering distribution did not change in relation to the previous breeding outcomes. Migration schedules (dates of departure from the breeding colony, southward and northward migrations, and first return to the colony) did not differ significantly between years for individuals that had chicks during both years, while failed individuals left the breeding colony and appeared to start the southward migration at an earlier date than the previous successful year. Nonetheless, the timing of the southward migration was consistent within individuals, including both males and females, over successive years regardless of the previous breeding outcome, and also the timing of first return back to the colony for females that had chicks in the both previous years and eggs in the both following season. This may imply the existence of individual-specific broad time schedules, possibly a circannual rhythm, though ecological conditions might affect the exact timing of the actual departure event. Our results present evidence for high levels of individually consistent behaviour for this pelagic seabird outside the breeding season.

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Arizmendi-Mejía, Rosana, Teresa Militão, Ginés Viscor, and Jacob González-Solís. "Pre-breeding ecophysiology of a long-distance migratory seabird." Journal of Experimental Marine Biology and Ecology 443 (May 2013): 162–68. http://dx.doi.org/10.1016/j.jembe.2013.02.047.

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Ramos, Raül, Jacob González-Solís, and Xavier Ruiz. "Linking isotopic and migratory patterns in a pelagic seabird." Oecologia 160, no. 1 (2009): 97–105. http://dx.doi.org/10.1007/s00442-008-1273-x.

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Baak, Julia E., Mark L. Mallory, Christine M. Anderson, et al. "Inter-individual variation in the migratory behaviour of a generalist seabird, the herring gull (Larus smithsoniansus), from the Canadian Arctic." Animal Migration 8, no. 1 (2021): 144–55. http://dx.doi.org/10.1515/ami-2020-0109.

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Abstract The Arctic is warming three times faster than the rest of the globe, causing rapid transformational changes in Arctic ecosystems. As these changes increase, understanding seabird movements will be important for predicting how they respond to climate change, and thus how we plan for conservation. Moreover, as most Arctic-breeding seabirds only spend the breeding season in the Arctic, climate change may also affect them through habitat changes in their non-breeding range. We used Global Location Sensors (GLS) to provide new insights on the movement of Arctic-breeding herring gulls (Larus smithsoniansus) in North America. We tracked gulls that wintered in the Gulf of Mexico (n = 7) or the Great Lakes (n = 1), and found that migratory routes and stopover sites varied between individuals, and between southbound and northbound migration. This inter-individual variation suggests that herring gulls, as a generalist species, can make use of an array of regions during migration, but may be more susceptible to climate change impacts in their overwintering locations than during migration. However, due to our limited sample size, future, multi-year studies are recommended to better understand the impacts of climate change on this Arctic-breeding seabird.

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Moss, Madonna L. "Haida and Tlingit Use of Seabirds from the Forrester Islands, Southeast Alaska." Journal of Ethnobiology 27, no. 1 (2007): 28–45. http://dx.doi.org/10.2993/0278-0771_2007_27_28_hatuos_2.0.co_2.

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This paper presents the results of recent archaeological survey and zooarchaeological studies of five sites located on the Forrester Islands of southeast Alaska, part of the Alaska Maritime National Wildlife Refuge managed by the U.S. Fish and Wildlife Service. Even though many Alaska Natives have a long history of hunting migratory birds—including seabirds—use of these resources is not well-documented, at least partly because harvest during the spring and summer was illegal for much of the 20th century. Ethnographic and biological data are employed to help interpret the zooarchaeological results. This study documents use of 11 seabird taxa, with Tufted Puffins, Common Murres, Rhinoceros Auklets, and Cassin's Auklets as the most heavily used species. The bird assemblages from the Forrester Islands demonstrate that the Haida, Tlingit, and their ancestors have been using seabirds from the Forrester Islands for over a thousand years.

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Schultner, Jannik, Børge Moe, Olivier Chastel, Claus Bech, and Alexander S. Kitaysky. "Migration and stress during reproduction govern telomere dynamics in a seabird." Biology Letters 10, no. 1 (2014): 20130889. http://dx.doi.org/10.1098/rsbl.2013.0889.

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Changes in telomere length are believed to reflect changes in physiological state and life expectancy in animals. However, much remains unknown about the determinants of telomere dynamics in wild populations, and specifically the influence of conditions during highly mobile life-history stages, for example migration. We tested whether telomere dynamics were associated with migratory behaviour and/or with stress during reproduction in free-living seabirds. We induced short-term stress during reproduction in chick-rearing, black-legged kittiwakes ( Rissa tridactyla ), tracked winter migration with geolocators and measured telomere length before and after winter migration. We found that time spent at wintering grounds correlated with reduced telomere loss, while stress during reproduction accelerated telomere shortening. Our results suggest that different life-history stages interact to influence telomere length, and that migratory patterns may be important determinants of variation in an individual's telomere dynamics.

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Freeman, Robin, Ben Dean, Holly Kirk, et al. "Predictive ethoinformatics reveals the complex migratory behaviour of a pelagic seabird, the Manx Shearwater." Journal of The Royal Society Interface 10, no. 84 (2013): 20130279. http://dx.doi.org/10.1098/rsif.2013.0279.

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Understanding the behaviour of animals in the wild is fundamental to conservation efforts. Advances in bio-logging technologies have offered insights into the behaviour of animals during foraging, migration and social interaction. However, broader application of these systems has been limited by device mass, cost and longevity. Here, we use information from multiple logger types to predict individual behaviour in a highly pelagic, migratory seabird, the Manx Shearwater ( Puffinus puffinus ). Using behavioural states resolved from GPS tracking of foraging during the breeding season, we demonstrate that individual behaviours can be accurately predicted during multi-year migrations from low cost, lightweight, salt-water immersion devices. This reveals a complex pattern of migratory stopovers: some involving high proportions of foraging, and others of rest behaviour. We use this technique to examine three consecutive years of global migrations, revealing the prominence of foraging behaviour during migration and the importance of highly productive waters during migratory stopover.

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Cutrim, Caio Henrique Gonçalves, Igor Luiz Araújo Munhoz, Leandro Bacci, Paulo Roberto Jesus Filho, and Vinícius Albano Araújo. "Illustrious visitors to the world nature heritage: seabird strandings in the Ilha Grande bay, Rio de Janeiro, Brazil." Nature and Conservation 14, no. 4 (2022): 70–78. http://dx.doi.org/10.6008/cbpc2318-2881.2021.004.0007.

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Seabirds use the extensive Brazilian coast as a migratory corridor where they explore resources for food and reproduction. The south coast of the State of Rio de Janeiro has hundreds of islands that are habitats for several species of seabirds. In this study, we analyze the abundance, richness and seasonality of birds stranded in Ilha Grande Bay, Rio de Janeiro, Brazil, an important natural and cultural heritage of humanity. The stranding record data were obtained during 5 years of beach monitoring (2016-2021), a total of 18.7 km of coastline and over 220 km (including islands and beaches outside regular monitoring). Most of the birds were found alive and sent for rehabilitation. A total of 268 seabird strandings were recorded, belonging to five orders, eight families and 19 species. Most strandings occurred in winter, with the most frequent species being Spheniscus magellanicus, Fregata magnificens and Sula leucogaster. Most species are seasonally without stranding pattern, with only six species being added throughout the annual cycle. Ilha Grande Bay is an important tourist pole in Brazil and knowledge of the diversity and dynamics of seabirds in the region can contribute to species management and conservation plans, in addition to potentialize the implementation of environmental tourism objectives and sustainable exploration of natural resources.

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Louzao, Maite, Karine Delord, David García, Isabel Afán, José Manuel Arcos, and Henri Weimerskirch. "First days at sea: depicting migration patterns of juvenile seabirds in highly impacted seascapes." PeerJ 9 (May 11, 2021): e11054. http://dx.doi.org/10.7717/peerj.11054.

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Increasing human activities have detrimental consequences on marine ecosystems and their impact can have cumulative effects. Within marine ecosystems, seabirds respond to ecosystem variability and face multiple human pressures, especially threatened species. In long-lived species, juveniles and immatures could represent up to 50% of the total population, but their migratory movements remain largely unknown. Here, we depict the migratory patterns of juvenile Balearic shearwaters Puffinus mauretanicus, the most threatened European seabird, using miniaturised satellite transmitters. At the end of the 2012 breeding season, five tagged juveniles left the breeding colonies of Eivissa Island (western Mediterranean) the first week of July. They moved westwards to reach the Atlantic Ocean between 3 and 13 days afterwards. Juveniles showed a two-phase migratory pattern: they first travelled slower close to the breeding colonies, and then moved towards their wintering areas in the Atlantic Ocean by rapid directional movements. Environmental cues (e.g.,marine productivity, water mass distribution, frontal systems) might have a prominent role in driving the migratory patterns of juvenile Balearic shearwaters, moving from warm and poor marine areas in the Mediterranean Sea to cooler and rich non-breeding grounds in the Atlantic Ocean. Based on observational findings, we observed certain spatial overlap of juvenile Balearic shearwaters with areas of high human impact, but the relationship between flying travel speed and both fishing effort and cumulative human impacts were not statistically significant. These results suggest that more research is needed to assess whether the movement patterns of migrating juveniles are affected by human activities. Therefore, understanding the at-sea spatial ecology of juveniles should be a priority for research and conservation due to the importance of this population component in long-lived species, as well as assessing their vulnerability to multiple anthropogenic pressures.

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Gibb, Rory, Akiko Shoji, Annette L. Fayet, Chris M. Perrins, Tim Guilford, and Robin Freeman. "Remotely sensed wind speed predicts soaring behaviour in a wide-ranging pelagic seabird." Journal of The Royal Society Interface 14, no. 132 (2017): 20170262. http://dx.doi.org/10.1098/rsif.2017.0262.

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Global wind patterns affect flight strategies in many birds, including pelagic seabirds, many of which use wind-powered soaring to reduce energy costs during at-sea foraging trips and migration. Such long-distance movement patterns are underpinned by local interactions between wind conditions and flight behaviour, but these fine-scale relationships are far less well understood. Here we show that remotely sensed ocean wind speed and direction are highly significant predictors of soaring behaviour in a migratory pelagic seabird, the Manx shearwater ( Puffinus puffinus ). We used high-frequency GPS tracking data (10 Hz) and statistical behaviour state classification to identify two energetic modes in at-sea flight, corresponding to flap-like and soar-like flight. We show that soaring is significantly more likely to occur in tailwinds and crosswinds above a wind speed threshold of around 8 m s −1 , suggesting that these conditions enable birds to reduce metabolic costs by preferentially soaring over flapping. Our results suggest a behavioural mechanism by which wind conditions may shape foraging and migration ecology in pelagic seabirds, and thus indicate that shifts in wind patterns driven by climate change could impact this and other species. They also emphasize the emerging potential of high-frequency GPS biologgers to provide detailed quantitative insights into fine-scale flight behaviour in free-living animals.

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Barbieri, Edison, and Douglas Bete. "Occurrence of Stercorarius pomarinus (Temminck, 1815, Charadriiformes: Stercorariidae) in the Cananéia estuary, southern coast of São Paulo State." Biota Neotropica 13, no. 1 (2013): 353–55. http://dx.doi.org/10.1590/s1676-06032013000100035.

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Many Neartic seabirds migrate to South America for the non-breeding season, using several key stopover and wintering sites along the Atlantic coast. The Stercorarius pomarinus is a widely distributed seabird found in every Ocean. It is a migratory bird from northern North America that flies southwards. However, there is little information about the occurrence of Stercorarius pomarinus along the São Paulo State coast. Former publications concerning the birds of Iguape- Cananéia- Ilha Comprida estuary have made no mention of the presence of this bird in the region. Thus it is important that forthcoming appearances be recorded. Throughout the bird-sample selection stage, undertaken since 1998 in the Cananéia estuary (25° 02' 44.71" S and 47° 55' 14.58" W) - 272 km from the city of São Paulo -, the bird was seen for the first time, resting in the Cananéia estuary, in January (2012). This note reports the occurrence of Stercorarius pomarinus in the Cananéia estuary, on the southern coast of São Paulo State, Brazil.

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Bond, Alexander L., and Antony W. Diamond. "Nutrient allocation for egg production in six Atlantic seabirds." Canadian Journal of Zoology 88, no. 11 (2010): 1095–102. http://dx.doi.org/10.1139/z10-082.

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How species allocate nutrients to egg production is an important question in contaminant analyses. Seabird eggs are sampled frequently in such studies, so it is important to know the source of nutrients in these eggs if the source of the contaminants is to be traced. We used a stable-isotope approach to evaluate the relative importance of locally derived nutrients (income breeding) and stored nutrient reserves (capital breeding) in six species of Atlantic seabirds (Arctic Tern, Sterna paradisaea Pontoppidan, 1763; Common Tern, Sterna hirundo L., 1758; Atlantic Puffin, Fratercula arctica (L., 1758); Common Murre, Uria aalge (Pontoppidan, 1763); Razorbill, Alca torda L., 1758; Leach’s Storm-Petrel, Oceanodroma leucorhoa (Vieillot, 1818)) breeding in the Bay of Fundy. We found that all species either were income breeders or adopted an intermediate strategy whereby varying proportions of locally derived nutrients were incorporated into eggs. Each species’ migratory behaviour is likely a main factor in determining the amount of endogenous nutrients used in egg formation.

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Jones, Rhys J. "The status of seabird colonies on the Cook Islands atoll of Suwarrow." Bird Conservation International 11, no. 4 (2001): 309–17. http://dx.doi.org/10.1017/s0959270901000351.

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Suwarrow (Suvorov) atoll is an important seabird breeding site in the central Pacific Ocean. However, it is not protected and is attractive to developers of potentially damaging aquaculture industries. In this paper I report the results of a survey conducted to establish the present status of Suwarrow's seabird colonies and to generate base-line data for measuring the effect of a proposed pearl-farm development. Between late July and early September 2000 the reef islets were surveyed for seabird chick numbers and age-states using a simple sampling method. In addition to Sooty Tern Sterna fuscata, populations of boobies Sula spp., noddies Anous spp., frigatebirds Fregata spp. and tropicbirds Phaethon spp. were assessed. Results showed that bird populations were maintaining levels similar to those from findings of surveys in 1992. Of particular note were globally significant numbers of Lesser Frigatebird Fregata ariel and Red-tailed Tropicbird Phaethon rubricauda. Migratory birds were observed with Bristle-thighed Curlew Numenius tahitiensis regularly seen. The well-being of bird-life on the islets appears to be indirectly proportional to the proximity of human activity, with birds not observed breeding on Anchorage Island – the islet most often visited by people.

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Tavares, Davi, Jailson Moura, and Salvatore Siciliano. "First documented record of the Roseate Tern Sterna dougallii Montagu, 1813 (Aves: Sternidae) in southeast Brazil." Check List 9, no. (4) (2013): 806–8. https://doi.org/10.15560/9.4.806.

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We report the first record of Sterna dougallii Montagu, 1813 on the southeastern Brazilian coast. During monthly bird surveys in the northern Rio de Janeiro State, on January 2012 we recovered a tern banded in Massachusetts, USA. The present record stretches the S. dougallii southernmost geographic distribution in Brazil (Bahia state) by about 600 km. It is difficult to evaluate this species' regional status due to the absence of continuous sampling efforts.

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Leat, EHK, S. Bourgeon, E. Magnusdottir, et al. "Influence of wintering area on persistent organic pollutants in a breeding migratory seabird." Marine Ecology Progress Series 491 (October 2, 2013): 277–93. http://dx.doi.org/10.3354/meps10455.

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Price, CA, K. Hartmann, TJ Emery, EJ Woehler, CR McMahon, and MA Hindell. "Climate variability and breeding parameters of a transhemispheric migratory seabird over seven decades." Marine Ecology Progress Series 642 (May 28, 2020): 191–205. http://dx.doi.org/10.3354/meps13328.

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Climate variability affects physical oceanographic systems and environmental conditions at multiple spatial and temporal scales. These changes can influence biological and ecological processes, from primary productivity to higher trophic levels. Short-tailed shearwaters Ardenna tenuirostris are transhemispheric migratory procellariiform seabirds that forage on secondary consumers such as fish (myctophids) and zooplankton (euphausiids). In this study, we investigated the breeding parameters of the short-tailed shearwater from a colony of 100 to 200 breeding pairs at Fisher Island, Tasmania, Australia, for the period 1950 to 2012, with the aim to quantify the relationship between breeding parameters with large-scale climate indices in the Northern (i.e. Northern Pacific Index and Pacific Decadal Oscillation) and Southern Hemispheres (i.e. El Niño-Southern Oscillation and Southern Annular Mode). Through the use of generalised linear models, we found that breeding participation among short-tailed shearwaters was affected by climate variability with a 12-mo temporal lag. Furthermore, breeding success decreased in years of increased rainfall at the colony. These findings demonstrate that both large-scale climate indices and local environmental conditions could explain some of the variability among breeding parameters of the short-tailed shearwater.

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JENOUVRIER, STEPHANIE, JEAN-CLAUDE THIBAULT, ANNE VIALLEFONT, et al. "Global climate patterns explain range-wide synchronicity in survival of a migratory seabird." Global Change Biology 15, no. 1 (2009): 268–79. http://dx.doi.org/10.1111/j.1365-2486.2008.01715.x.

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Hennin, Holly L., Jöel Bêty, Pierre Legagneux, H. Grant Gilchrist, Tony D. Williams, and Oliver P. Love. "Energetic Physiology Mediates Individual Optimization of Breeding Phenology in a Migratory Arctic Seabird." American Naturalist 188, no. 4 (2016): 434–45. http://dx.doi.org/10.1086/688044.

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Fort, Jérôme, Harald Steen, Hallvard Strøm, et al. "Energetic consequences of contrasting winter migratory strategies in a sympatric Arctic seabird duet." Journal of Avian Biology 44, no. 3 (2013): 255–62. http://dx.doi.org/10.1111/j.1600-048x.2012.00128.x.

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Medeiros, Renata J., R. Andrew King, William O. C. Symondson, et al. "Molecular Evidence for Gender Differences in the Migratory Behaviour of a Small Seabird." PLoS ONE 7, no. 9 (2012): e46330. http://dx.doi.org/10.1371/journal.pone.0046330.

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Amélineau, F., J. Fort, P. D. Mathewson, et al. "Energyscapes and prey fields shape a North Atlantic seabird wintering hotspot under climate change." Royal Society Open Science 5, no. 1 (2018): 171883. http://dx.doi.org/10.1098/rsos.171883.

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There is an urgent need for a better understanding of animal migratory ecology under the influence of climate change. Most current analyses require long-term monitoring of populations on the move, and shorter-term approaches are needed. Here, we analysed the ecological drivers of seabird migration within the framework of the energyscape concept, which we defined as the variations in the energy requirements of an organism across geographical space as a function of environmental conditions. We compared the winter location of seabirds with their modelled energy requirements and prey fields throughout the North Atlantic. Across six winters, we tracked the migration of 94 little auks ( Alle alle ), a key sentinel Arctic species, between their East Greenland breeding site and wintering areas off Newfoundland. Winter energyscapes were modelled with Niche Mapper™, a mechanistic tool which takes into account local climate and bird ecophysiology. Subsequently, we used a resource selection function to explain seabird distributions through modelled energyscapes and winter surface distribution of one of their main prey, Calanus finmarchicus . Finally, future energyscapes were calculated according to IPCC climate change scenarios. We found that little auks targeted areas with high prey densities and moderately elevated energyscapes. Predicted energyscapes for 2050 and 2095 showed a decrease in winter energy requirements under the high emission scenario, which may be beneficial if prey availability is maintained. Overall, our study demonstrates the great potential of the energyscape concept for the study of animal spatial ecology, in particular in the context of global change.

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Pérez, Cristóbal, José Pedro Granadeiro, Maria P. Dias, and Paulo Catry. "Sex and migratory strategy influence corticosterone levels in winter-grown feathers, with positive breeding effects in a migratory pelagic seabird." Oecologia 181, no. 4 (2016): 1025–33. http://dx.doi.org/10.1007/s00442-016-3625-2.

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Muñoz Arroyo, Gonzalo, and María Mateos-Rodríguez. "Do Seabirds Control Wind Drift during Their Migration across the Strait of Gibraltar? A Study Using Remote Tracking by Radar." Remote Sensing 14, no. 12 (2022): 2792. http://dx.doi.org/10.3390/rs14122792.

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This study presents data on the directional flying behaviour of the five most abundant seabird species migrating across the Strait of Gibraltar in relation to the wind, as observed from the north coast, based on radar tracking, and identified to species level by visual observations. A total of 318 seabird trajectories were analysed, illustrating the expected east–west or west–east movements in spring and autumn. We hypothesised that the seabirds that cross the Strait channel during their migrations would behave differently with respect to compensation for wind direction, depending on their flight styles, the migratory period, and the prevailing winds. In this regard, our results showed that flapping birds (Razorbill, Puffin, Northern Gannet, and Balearic shearwater) compensated for wind drift independently of the season and the predominant wind direction. This agrees with the theory that suggests that under moderate winds and whenever visual contact with the coastline is present (as in the case of our study), migrants should compensate for wind drift to avoid being drifted towards the coast, off their main direction of flight. However, Cory’s shearwater, an active gliding seabird with long, slender wings, showed an adaptive directional response to wind, allowing it to be drifted in spring when westerly tailwinds were prevalent, but compensated for wind in autumn, when both easterly and westerly winds were similarly frequent. This adaptive flight behaviour allows it to take advantage of the prevailing tailwinds in spring, gaining ground speed and saving energy during its passage through the Strait, while in autumn, more frequent headwind conditions and a more directional migration to the south may favour compensating for wind drift. Our results support the usefulness of bird radar as a remote tool for describing the pattern of animal movements in the marine environment, as well as their behavioural response to atmospheric conditions. These studies are particularly relevant in the current framework of climate change.

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Baak, Julia E., Allison Patterson, H. Grant Gilchrist, and Kyle H. Elliott. "First evidence of diverging migration and overwintering strategies in glaucous gulls (Larus hyperboreus) from the Canadian Arctic." Animal Migration 8, no. 1 (2021): 98–109. http://dx.doi.org/10.1515/ami-2020-0107.

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Abstract Many seabird populations differ in their migration strategies, where individuals travel in different directions to separate wintering areas. These migratory strategies may expose individuals to different threats, thus understanding migratory connectivity is crucial to assess risks to populations. Glaucous gulls (Larus hyperboreus) are generalist predators with flexible migratory behaviour that may alter these behaviours in response to climate change and anthropogenic activities, such as access to landfills, yet little is known about their migration. We deployed GPS and GLS tracking devices on glaucous gulls from Coats Island, Nunavut, Canada to obtain the first insights into their migration and habitat use outside of the breeding season. Gulls used two migration strategies during the non-breeding season, where one migrated as far as the Sea of Okhotsk in the Pacific and the remainder (n = 7) wintered in the North Atlantic. Gulls primarily overwintered in pelagic (56%) and coastal (38%) habitats. While in coastal habitats, one gull visited one landfill once, but visits increased with a 1 km and 3 km buffer, suggesting that urban glaucous gulls primarily used non-landfill habitats. This research can be used as a baseline to explore changes in migratory behaviour and inform future conservation of Arctic-breeding gulls.

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Matos, Andressa Maria Rorato Nascimento de, Fernanda Louise Pereira Lavorente, Elis Lorenzetti, et al. "Molecular identification and histological aspects of Renicola sloanei (Digenea: Renicolidae) in Puffinus puffinus (Procellariiformes): a first record." Revista Brasileira de Parasitologia Veterinária 28, no. 3 (2019): 367–75. http://dx.doi.org/10.1590/s1984-29612019025.

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Abstract Renicolids are parasites that inhabit the renal tubules and ureters of molluscivorous and piscivorous birds. Puffinus puffinus is a migratory seabird that was identified as the definitive host of Renicola spp. Studies focusing on the renicolid species and the resulting renal lesions are valuable for their association with causes of stranding in seabirds. The aim of this study was to identify the renicolid trematodes and evaluate the histological findings in two P. puffinus stranded on the coast of Paraná state, Brazil. The parasites were evaluated by histologic, ultrastructural and molecular assays, while tissue changes were analyzed by histologic methods. The morphological and morphometrical characteristics of the parasites, along with polymerase chain reaction and sequencing assays (ribosomal and mitochondrial regions), identified the species as Renicola sloanei. The results also suggest that this helminth can be the adult form of Cercaria pythionike. The dilation of collecting ducts was the main histological finding in the kidneys. In conclusion, R. sloanei was identified, and for the first time, P. puffinus was described as a host of this digenean inducing mild renal changes.

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Genovart, Meritxell, Ana Sanz-Aguilar, Albert Fernández-Chacón, et al. "Contrasting effects of climatic variability on the demography of a trans-equatorial migratory seabird." Journal of Animal Ecology 82, no. 1 (2012): 121–30. http://dx.doi.org/10.1111/j.1365-2656.2012.02015.x.

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RAMOS, RAÜL, TERESA MILITÃO, JACOB GONZÁLEZ-SOLÍS, and XAVIER RUIZ. "Moulting strategies of a long-distance migratory seabird, the Mediterranean Cory's ShearwaterCalonectris diomedea diomedea." Ibis 151, no. 1 (2009): 151–59. http://dx.doi.org/10.1111/j.1474-919x.2008.00877.x.

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42

Fayet, Annette L., Robin Freeman, Akiko Shoji, et al. "Carry-over effects on the annual cycle of a migratory seabird: an experimental study." Journal of Animal Ecology 85, no. 6 (2016): 1516–27. http://dx.doi.org/10.1111/1365-2656.12580.

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43

Møller, A. P., E. Flensted-Jensen, and W. Mardal. "Black beak tip coloration as a signal of phenotypic quality in a migratory seabird." Behavioral Ecology and Sociobiology 61, no. 10 (2007): 1561–71. http://dx.doi.org/10.1007/s00265-007-0388-0.

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Thiebot, Jean-Baptiste, Charles-André Bost, Nina Dehnhard, et al. "Mates but not sexes differ in migratory niche in a monogamous penguin species." Biology Letters 11, no. 9 (2015): 20150429. http://dx.doi.org/10.1098/rsbl.2015.0429.

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Strong pair bonds generally increase fitness in monogamous organisms, but may also underlie the risk of hampering it when re-pairing fails after the winter season. We investigated whether partners would either maintain contact or offset this risk by exploiting sex-specific favourable niches during winter in a migratory monogamous seabird, the southern rockhopper penguin Eudyptes chrysocome . Using light-based geolocation, we show that although the spatial distribution of both sexes largely overlapped, pair-wise mates were located on average 595 ± 260 km (and up to 2500 km) apart during winter. Stable isotope data also indicated a marked overlap between sex-specific isotopic niches ( δ 13 C and δ 15 N values) but a segregation of the feeding habitats ( δ 13 C values) within pairs. Importantly, the tracked females remained longer (12 days) at sea than males, but all re-mated with their previous partners after winter. Our study provides multiple evidence that migratory species may well demonstrate pair-wise segregation even in the absence of sex-specific winter niches (spatial and isotopic). We suggest that dispersive migration patterns with sex-biased timings may be a sufficient proximal cause for generating such a situation in migratory animals.

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Kim, Heung-Chul, Ju Jiang, Jun Hang, et al. "Detection of Rickettsia lusitaniae Among Ornithodoros sawaii Soft Ticks Collected From Japanese Murrelet Seabird Nest Material From Gugul Island, Republic of Korea." Journal of Medical Entomology 58, no. 3 (2021): 1376–83. http://dx.doi.org/10.1093/jme/tjab005.

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Abstract In a follow-up to the investigations of soft ticks identified from seabird nest soil and litter collected from coastal islands of the Republic of Korea (ROK), Ornithodoros sawaii and Ornithodoros capensis were assessed for the presence and identification of rickettsiae. Ticks collected from samples of 50–100 g of nest litter and soil from seabird nests were identified individually by morphological techniques, and species confirmed by sequencing of the mt-rrs gene. Subsequently, tick DNA preparations were screened for the presence of rickettsiae using a genus-specific nested PCR (nPCR) assay targeting the 17 kDa antigen gene. The amplicons from the 17 kDa assay and two additional nPCR assays targeting the gltA and ompB gene fragments were sequenced and used to identify the rickettsiae. A total of 134 soft ticks belonging to two species, O. sawaii Kitaoka & Suzuki 1973 (n = 125) and O. capensis Neumann 1901 (n = 9), were collected. Rickettsia lusitaniae DNA was detected and identified among O. sawaii ticks (n = 11, 8.8%) collected from nest litter and soil of the Japanese murrelet (Synthliboramphus wumizusume Temminck 1836) at Gugul Island along the western coastal area of the ROK. This study confirmed for the first time the presence of R. lusitaniae associated with O. sawaii collected from migratory seabird nests in the ROK.

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Guilford, T., J. Meade, J. Willis, et al. "Migration and stopover in a small pelagic seabird, the Manx shearwater Puffinus puffinus : insights from machine learning." Proceedings of the Royal Society B: Biological Sciences 276, no. 1660 (2009): 1215–23. http://dx.doi.org/10.1098/rspb.2008.1577.

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The migratory movements of seabirds (especially smaller species) remain poorly understood, despite their role as harvesters of marine ecosystems on a global scale and their potential as indicators of ocean health. Here we report a successful attempt, using miniature archival light loggers (geolocators), to elucidate the migratory behaviour of the Manx shearwater Puffinus puffinus , a small (400 g) Northern Hemisphere breeding procellariform that undertakes a trans-equatorial, trans-Atlantic migration. We provide details of over-wintering areas, of previously unobserved marine stopover behaviour, and the long-distance movements of females during their pre-laying exodus. Using salt-water immersion data from a subset of loggers, we introduce a method of behaviour classification based on Bayesian machine learning techniques. We used both supervised and unsupervised machine learning to classify each bird's daily activity based on simple properties of the immersion data. We show that robust activity states emerge, characteristic of summer feeding, winter feeding and active migration. These can be used to classify probable behaviour throughout the annual cycle, highlighting the likely functional significance of stopovers as refuelling stages.

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Cotter, Richard, and Jean-François Rail. "Third Census of Seabird Populations of the Gaspé Peninsula, Québec, 2002." Canadian Field-Naturalist 121, no. 3 (2007): 274. http://dx.doi.org/10.22621/cfn.v121i3.475.

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In the tradition of the quinquennial census of seabirds in the Migratory Bird Sanctuaries along Québec’s North Shore, which began in 1925, this paper presents the results of the first three seabird censuses of the Gaspé Peninsula conducted in 1979, 1989, and 2002, with an emphasis on the third census and on changes in seabird populations that occurred between the second and third censuses. In 1979 the population of seabirds was estimated at 134,163 birds, and this increased 72% to 231,186 birds in 1989. The upward trend in population continued in the 1990s but less sharply. The 2002 census recorded 279,276 birds, a 21% increase over the second census. The seabird community of the Gaspé Peninsula comprises 14 species. In each of the three censuses, three species accounted for over 75% of the total seabird population: Northern Gannet, Black-legged Kittiwake, and Common Murre. Between 1989 and 2002, Common Eider, Northern Gannet, Great Cormorant, Ring-billed Gull, Razorbill, and Black Guillemot increased in numbers, whereas Herring Gull, Black-legged Kittiwake, and Common Tern all suffered declines. Populations for Double-crested Cormorant, Great Black-backed Gull, and Common Murre all remained stable. Very small populations (<25 birds) of Leach’s Storm-Petrel and Atlantic Puffin have been recorded during the censuses at only one location, Bonaventure Island. In the 2002 census there were no petrels observed, neither of adults nor of active burrows.À l’instar des inventaires quinquennaux des oiseaux marins dans les refuges d’oiseaux migrateurs de la Côte-Nord, entrepris en 1925, cet article présente les résultats des trois premiers inventaires complets des oiseaux de mer nicheurs en Gaspésie, menés en 1979, 1989 et 2002. Une attention particulière est mise sur le statut des espèces d’après le troisième inventaire, et sur les tendances des populations entre les deux derniers inventaires. En 1979, le nombre d’oiseaux marins nicheur était évalué à 134 163 oiseaux, puis ce total a augmenté de 72% pour atteindre 231 186 oiseaux en 1989. Cette tendance à la hausse a continué dans les années 90, mais moins rapidement. En 2002 l’estimation était de 279 276 oiseaux, soit une hausse de 21 % par rapport au deuxième inventaire. La communauté d’oiseaux de mer de la Gaspésie est formée de 14 espèces nicheuses. Dans chacun des trois inventaires, trois espèces représentaient plus de 75 % de la population totale des oiseaux marins: le Fou de Bassan, la Mouette tridactyle, et le Guillemot marmette. Entre 1989 et 2002, l’Eider à duvet, le Fou de Bassan, le Grand Cormoran, le Goéland à bec cerclé, le Petit Pingouin et le Guillemot à miroir ont vu leurs nombres croître, tandis que le Goéland argenté, la Mouette tridactyle et la Sterne pierregarin subissaient des déclins. Les populations de Cormoran à aigrettes, Goéland marin et Guillemot marmette sont demeurées stables. Les petites populations (<25 oiseaux) d’Océanite cul-blanc et de Macareux moine n’ont été vues durant ces inventaires qu’à l’île Bonaventure. Cependant, aucun nid actif d’océanite ne fut localisé à cet endroit en 2002.

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Fracasso, Hélio A. A., and Joaquim O. Branco. "Reproductive success of South American terns (Sterna hirundinacea) from Cardos Islands, Florianópolis, SC, Brazil." Anais da Academia Brasileira de Ciências 84, no. 2 (2012): 527–36. http://dx.doi.org/10.1590/s0001-37652012005000020.

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Sterna hirundinacea (Lesson, 1831) is a migratory seabird that breeds in the Pacific Coast (from Peru to Chile) and along the Atlantic coast of South America from Espírito Santo (Brazil) to Terra del Fuego (Argentina). This paper describes the reproductive success of South American Terns on Cardos Island, Florianopolis, Brazil in the breeding seasons of 2003, 2005 and 2006. The colony was formed in mid-May in 2003 and early April in other years, with the total number of nests ranging from 1,852 in 2006 to 2,486 in 2005. Hatching success was estimated at 76.39% in 2006, 62.73% in 2003 and 41.1% in 2005, the lowest value that could be attributed to predation by hawks Caracara plancus, lizards Tupinambis merianae and black vulture Coragyps atratus. The chicks hatched in July in 2003, and in June 2005 and 2006, and fledging success was 50.94%, 35.96 and 53.47% respectively. Cardos Island has been constantly used as a breeding site by South American Terns, and therefore represents an important area for conservation of this species. This success could be attributed to low pressure of Kelp gulls (Larus dominicanus), the main predator of seabirds along the Brazilian coast.

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Dias, Maria P., José P. Granadeiro, Richard A. Phillips, Hany Alonso, and Paulo Catry. "Breaking the routine: individual Cory's shearwaters shift winter destinations between hemispheres and across ocean basins." Proceedings of the Royal Society B: Biological Sciences 278, no. 1713 (2010): 1786–93. http://dx.doi.org/10.1098/rspb.2010.2114.

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There is growing evidence that migratory species are particularly vulnerable to rapid environmental changes arising from human activity. Species are expected to vary in their capacity to respond to these changes: long-distance migrants and those lacking variability in migratory traits are probably at considerable disadvantage. The few studies that have assessed the degree of plasticity in behaviour of marine animals suggest that fidelity to non-breeding destinations is usually high. In the present study, we evaluated individual flexibility in migration strategy of a highly pelagic seabird, the Cory's shearwater Calonectris diomedea . Geolocation data from 72 different migrations, including 14 birds that were tracked for more than one non-breeding season, showed a remarkable capacity to change winter destinations between years. Although some birds exhibited high site fidelity, others shifted from the South to North Atlantic, from the western to eastern South Atlantic, and from the Atlantic to Indian Ocean. Individuals also showed flexibility in stopover behaviour and migratory schedule. Although their K-selected life-history strategy has the disadvantage that the chances of microevolution are slight if circumstances alter rapidly, these results suggest that Cory's shearwaters may be in a better position than many other long-distance migrants to face the consequences of a changing environment.

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Drummond, Brie A., Rachael A. Orben, Aaron M. Christ, et al. "Comparing non-breeding distribution and behavior of red-legged kittiwakes from two geographically distant colonies." PLOS ONE 16, no. 7 (2021): e0254686. http://dx.doi.org/10.1371/journal.pone.0254686.

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Abstract:

Knowledge of non-breeding distributions is a crucial component to seabird conservation, as conditions during the non-breeding period can play an important role in regulating seabird populations. Specifically, if seabirds from different colonies share the same wintering grounds, conditions in that shared region could have a widespread impact on multiple breeding populations. Red-legged kittiwakes (Rissa brevirostris) are endemic to the Bering Sea and may be especially susceptible to effects of climate change due to a restricted breeding range, small population size, and specialized diet. To examine whether red-legged kittiwakes from different breeding colonies overlapped in winter distribution and activity patterns, we used geolocation loggers to simultaneously track individuals from the two largest red-legged kittiwake breeding colonies in Alaska (separated by over 1000 km) during two consecutive non-breeding periods. We found that non-breeding activity patterns were generally similar between birds originating from the two colonies, but birds employed different migratory strategies during the early winter. Kittiwakes from Buldir Island in the western Aleutian Islands left the colony in September and immediately headed west, spending October through December around the Sea of Okhotsk and the Kuril Islands. In contrast, birds from St. George Island in the Pribilof Islands remained in the eastern Bering Sea or around the eastern Aleutian Islands for a couple months before traveling farther west. During late winter however, from January through March, birds from both colonies converged south of Kamchatka and east of the Kuril Islands over the Kuril-Kamchatka Trench and in the Western Subarctic Gyre before returning to their respective colonies in the spring. This late winter overlap in distributions along the Kuril-Kamchatka Trench suggests the region is a winter hotspot for red-legged kittiwakes and highlights the importance of this region for the global kittiwake population.

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Journal articles on the topic 'Migratory seabird'

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