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2. Foraging range scales with colony size in high-latitude seabirds

Author

Patterson, Allison, primary, Gilchrist, H. Grant, additional, Benjaminsen, Sigurd, additional, Bolton, Mark, additional, Bonnet-Lebrun, Anne Sophie, additional, Davoren, Gail K., additional, Descamps, Sébastien, additional, Erikstad, Kjell Einar, additional, Frederiksen, Morten, additional, Gaston, Anthony J., additional, Gulka, Julia, additional, Hentati-Sundberg, Jonas, additional, Huffeldt, Nicholas Per, additional, Johansen, Kasper Lambert, additional, Labansen, Aili Lage, additional, Linnebjerg, Jannie Fries, additional, Love, Oliver P., additional, Mallory, Mark L., additional, Merkel, Flemming Ravn, additional, Montevecchi, William A., additional, Mosbech, Anders, additional, Olsson, Olof, additional, Owen, Ellie, additional, Ratcliffe, Norman, additional, Regular, Paul M., additional, Reiertsen, Tone Kristin, additional, Ropert-Coudert, Yan, additional, Strøm, Hallvard, additional, Thórarinsson, Thorkell Lindberg, additional, and Elliott, Kyle H., additional

Published
2022
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3. Foraging range scales with colony size in high-latitude seabirds

Author

Patterson, Allison, Gilchrist, H. Grant, Benjaminsen, Sigurd, Bolton, Mark, Bonnet-Lebrun, Anne-Sophie, Davoren, Gail K., Descamps, Sébastien, Erikstad, Kjell Einar, Frederiksen, Morten, Gaston, Anthony J., Gulka, Julia, Hentati-Sundberg, Jonas, Huffeldt, Nicholas Per, Johansen, Kasper Lambert, Labansen, Aili Lage, Linnebjerg, Jannie Fries, Love, Oliver P., Mallory, Mark L., Merkel, Flemming Ravn, Montevecchi, William A., Mosbech, Anders, Olsson, Olof, Owen, Ellie, Ratcliffe, Norman, Regular, Paul M., Reiertsen, Tone Kristin, Ropert-Coudert, Yan, Strøm, Hallvard, Thórarinsson, Thorkell Lindberg, Elliott, Kyle H., Patterson, Allison, Gilchrist, H. Grant, Benjaminsen, Sigurd, Bolton, Mark, Bonnet-Lebrun, Anne-Sophie, Davoren, Gail K., Descamps, Sébastien, Erikstad, Kjell Einar, Frederiksen, Morten, Gaston, Anthony J., Gulka, Julia, Hentati-Sundberg, Jonas, Huffeldt, Nicholas Per, Johansen, Kasper Lambert, Labansen, Aili Lage, Linnebjerg, Jannie Fries, Love, Oliver P., Mallory, Mark L., Merkel, Flemming Ravn, Montevecchi, William A., Mosbech, Anders, Olsson, Olof, Owen, Ellie, Ratcliffe, Norman, Regular, Paul M., Reiertsen, Tone Kristin, Ropert-Coudert, Yan, Strøm, Hallvard, Thórarinsson, Thorkell Lindberg, and Elliott, Kyle H.

Abstract

Density-dependent prey depletion around breeding colonies has long been considered an important factor controlling the population dynamics of colonial animals. Ashmole proposed that as seabird colony size increases, intraspecific competition leads to declines in reproductive success, as breeding adults must spend more time and energy to find prey farther from the colony.1 Seabird colony size often varies over several orders of magnitude within the same species and can include millions of individuals per colony. As such, colony size likely plays an important role in determining the individual behavior of its members and how the colony interacts with the surrounding environment.6 Using tracking data from murres (Uria spp.), the world’s most densely breeding seabirds, we show that the distribution of foraging-trip distances scales to colony size0.33 during the chick-rearing stage, consistent with Ashmole’s halo theory.1,2 This pattern occurred across colonies varying in size over three orders of magnitude and distributed throughout the North Atlantic region. The strong relationship between colony size and foraging range means that the foraging areas of some colonial species can be estimated from colony sizes, which is more practical to measure over a large geographic scale. Two-thirds of the North Atlantic murre population breed at the 16 largest colonies; by extrapolating the predicted foraging ranges to sites without tracking data, we show that only two of these large colonies have significant coverage as marine protected areas. Our results are an important example of how theoretical models, in this case, Ashmole’s version of central-place-foraging theory, can be applied to inform conservation and management in colonial breeding species.

Published
2022

5. Multispecies tracking reveals a major seabird hotspot in the North Atlantic

Author

Davies, Tammy E., primary, Carneiro, Ana P.B., additional, Tarzia, Marguerite, additional, Wakefield, Ewan, additional, Hennicke, Janos C., additional, Frederiksen, Morten, additional, Hansen, Erpur Snær, additional, Campos, Bruna, additional, Hazin, Carolina, additional, Lascelles, Ben, additional, Anker‐Nilssen, Tycho, additional, Arnardóttir, Hólmfríður, additional, Barrett, Robert T., additional, Biscoito, Manuel, additional, Bollache, Loïc, additional, Boulinier, Thierry, additional, Catry, Paulo, additional, Ceia, Filipe R., additional, Chastel, Olivier, additional, Christensen‐Dalsgaard, Signe, additional, Cruz‐Flores, Marta, additional, Danielsen, Jóhannis, additional, Daunt, Francis, additional, Dunn, Euan, additional, Egevang, Carsten, additional, Fagundes, Ana Isabel, additional, Fayet, Annette L., additional, Fort, Jérôme, additional, Furness, Robert W., additional, Gilg, Olivier, additional, González‐Solís, Jacob, additional, Granadeiro, José Pedro, additional, Grémillet, David, additional, Guilford, Tim, additional, Hanssen, Sveinn Are, additional, Harris, Michael P., additional, Hedd, April, additional, Huffeldt, Nicholas Per, additional, Jessopp, Mark, additional, Kolbeinsson, Yann, additional, Krietsch, Johannes, additional, Lang, Johannes, additional, Linnebjerg, Jannie Fries, additional, Lorentsen, Svein‐Håkon, additional, Madeiros, Jeremy, additional, Magnusdottir, Ellen, additional, Mallory, Mark L., additional, McFarlane Tranquilla, Laura, additional, Merkel, Flemming R., additional, Militão, Teresa, additional, Moe, Børge, additional, Montevecchi, William A., additional, Morera‐Pujol, Virginia, additional, Mosbech, Anders, additional, Neves, Verónica, additional, Newell, Mark A., additional, Olsen, Bergur, additional, Paiva, Vitor H., additional, Peter, Hans‐Ulrich, additional, Petersen, Aevar, additional, Phillips, Richard A., additional, Ramírez, Iván, additional, Ramos, Jaime A., additional, Ramos, Raül, additional, Ronconi, Robert A., additional, Ryan, Peter G., additional, Schmidt, Niels Martin, additional, Sigurðsson, Ingvar A., additional, Sittler, Benoît, additional, Steen, Harald, additional, Stenhouse, Iain J., additional, Strøm, Hallvard, additional, Systad, Geir H. R., additional, Thompson, Paul, additional, Thórarinsson, Thorkell L., additional, van Bemmelen, Rob S.A., additional, Wanless, Sarah, additional, Zino, Francis, additional, and Dias, Maria P., additional

Published
2021
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7. Multispecies tracking reveals a major seabird hotspot in the North Atlantic

Author

Davies, Tammy E., Carneiro, Ana P.B., Tarzia, Marguerite, Wakefield, Ewan, Hennicke, Janos C., Frederiksen, Morten, Hansen, Erpur Snær, Campos, Bruna, Hazin, Carolina, Lascelles, Ben, Anker-Nilssen, Tycho, Arnardóttir, Hólmfríður, Biscoito, Manuel, Bollache, Loïc, Boulinier, Thierry, Catry, Paulo, Ceia, Filipe R., Chastel, Olivier, Christensen-Dalsgaard, Signe, Cruz-Flores, Marta, Danielsen, Jóhannis, Daunt, Francis, Dunn, Euan, Egevang, Carsten, Fagundes, Ana Isabel, Fayet, Annette L., Fort, Jérôme, Furness, Robert W., Gilg, Olivier, González-Solís, Jacob, Granadeiro, José Pedro, Grémillet, David, Guilford, Tim, Hanssen, Sveinn Are, Harris, Michael P., Hedd, April, Huffeldt, Nicholas Per, Jessopp, Mark, Kolbeinsson, Yann, Krietsch, Johannes, Lang, Johannes, Linnebjerg, Jannie Fries, Lorentsen, Svein-Håkon, Madeiros, Jeremy, Magnusdottir, Ellen, Mallory, Mark L., McFarlane Tranquilla, Laura, Merkel, Flemming R., Militão, Teresa, Moe, Børge, Montevecchi, William A., Morera-Pujol, Virginia, Mosbech, Anders, Neves, Verónica, Newell, Mark A., Olsen, Berger, Paiva, Vitor H., Peter, Hans-Ulrich, Petersen, Aevar, Phillips, Richard A., Ramírez, Iván, Ramos, Jaime A., Ramos, Raül, Ronconi, Robert A., Ryan, Peter G., Schmidt, Niels Martin, Sigurðsson, Ingvar A., Sittler, Benoît, Steen, Harald, Stenhouse, Iain J., Strøm, Hallvard, Systad, Geir H.R., Thompson, Paul, Thórarinsson, Thorkell L., van Bemmelen, Rob S.A., Wanless, Sarah, Zino, Francis, Dias, Maria P., Davies, Tammy E., Carneiro, Ana P.B., Tarzia, Marguerite, Wakefield, Ewan, Hennicke, Janos C., Frederiksen, Morten, Hansen, Erpur Snær, Campos, Bruna, Hazin, Carolina, Lascelles, Ben, Anker-Nilssen, Tycho, Arnardóttir, Hólmfríður, Biscoito, Manuel, Bollache, Loïc, Boulinier, Thierry, Catry, Paulo, Ceia, Filipe R., Chastel, Olivier, Christensen-Dalsgaard, Signe, Cruz-Flores, Marta, Danielsen, Jóhannis, Daunt, Francis, Dunn, Euan, Egevang, Carsten, Fagundes, Ana Isabel, Fayet, Annette L., Fort, Jérôme, Furness, Robert W., Gilg, Olivier, González-Solís, Jacob, Granadeiro, José Pedro, Grémillet, David, Guilford, Tim, Hanssen, Sveinn Are, Harris, Michael P., Hedd, April, Huffeldt, Nicholas Per, Jessopp, Mark, Kolbeinsson, Yann, Krietsch, Johannes, Lang, Johannes, Linnebjerg, Jannie Fries, Lorentsen, Svein-Håkon, Madeiros, Jeremy, Magnusdottir, Ellen, Mallory, Mark L., McFarlane Tranquilla, Laura, Merkel, Flemming R., Militão, Teresa, Moe, Børge, Montevecchi, William A., Morera-Pujol, Virginia, Mosbech, Anders, Neves, Verónica, Newell, Mark A., Olsen, Berger, Paiva, Vitor H., Peter, Hans-Ulrich, Petersen, Aevar, Phillips, Richard A., Ramírez, Iván, Ramos, Jaime A., Ramos, Raül, Ronconi, Robert A., Ryan, Peter G., Schmidt, Niels Martin, Sigurðsson, Ingvar A., Sittler, Benoît, Steen, Harald, Stenhouse, Iain J., Strøm, Hallvard, Systad, Geir H.R., Thompson, Paul, Thórarinsson, Thorkell L., van Bemmelen, Rob S.A., Wanless, Sarah, Zino, Francis, and Dias, Maria P.

Abstract

The conservation of migratory marine species, including pelagic seabirds, is challenging because their movements span vast distances frequently beyond national jurisdictions. Here, we aim to identify important aggregations of seabirds in the North Atlantic to inform ongoing regional conservation efforts. Using tracking, phenology, and population data, we mapped the abundance and diversity of 21 seabird species. This revealed a major hotspot associated with a discrete area of the subpolar frontal zone, used annually by 2.9–5 million seabirds from ≥56 colonies in the Atlantic: the first time this magnitude of seabird concentrations has been documented in the high seas. The hotspot is temporally stable and amenable to site-based conservation and is under consideration as a marine protected area by the OSPAR Commission. Protection could help mitigate current and future threats facing species in the area. Overall, our approach provides an exemplar data-driven pathway for future conservation efforts on the high seas.

Published
2021

8. Changing winter diet of Thick-billed Murres (Uria lomvia) in southwest Greenland, 1990s versus 2010s

Author

Merkel, Flemming Ravn, Linnebjerg, Jannie Fries, Andersen, Ole Gorm Norden, Huffeldt, Nicholas Per, Jansen, Teunis, Hedeholm, Rasmus, Frederiksen, Morten, Merkel, Flemming Ravn, Linnebjerg, Jannie Fries, Andersen, Ole Gorm Norden, Huffeldt, Nicholas Per, Jansen, Teunis, Hedeholm, Rasmus, and Frederiksen, Morten

Abstract

Southwest Greenland constitutes an internationally important wintering area for seabirds, including Thick-billed Murres (Uria lomvia (Linnaeus, 1758)), but their prey may be affected by the general warming of this sub-Arctic region. We compared murre diet collected in winter in the 1990s and in the 2010s around Nuuk, Greenland. Fish made up 36% of the diet (wet mass) and crustaceans 63% in the 1990s, changing to 22% and 78% in the 2010s, respectively. Capelin (Mallotus villosus (Müller, 1776)) was the dominant fish species, and the smaller contribution in the 2010s coincided with declining densities of capelin around Nuuk. The crustaceans were dominated by two krill species (Meganyctiphanes norvegica (M. Sars, 1857) and Thysanoessa inermis (Krøyer, 1846)). However, M. norvegica was only important in the 2010s (51% wet mass), while T. inermis was dominating the 1990s with 62% wet mass and only 23% in the 2010s. The dominance of M. norvegica in the 2010s confirmed our expectations of a gradual “borealization” of this region due to the generally warming sub-Arctic. The smaller contribution of fish in the diet may also support the hypothesis of deteriorating winter conditions for murres. Apart from the diet, plastic was found in 15% of the birds and 53% had parasitic nematodes.

Published
2021

10. Effects of oil and oil burn residues on seabird feathers

Author

Fritt-Rasmussen, Janne, Linnebjerg, Jannie Fries, Sørensen, Martin X., Brogaard, Nicholas L., Rigét, Frank F., Kristensen, Paneeraq, Jomaas, Grunde, Boertmann, David M., Wegeberg, Susse, Gustavson, Kim, Fritt-Rasmussen, Janne, Linnebjerg, Jannie Fries, Sørensen, Martin X., Brogaard, Nicholas L., Rigét, Frank F., Kristensen, Paneeraq, Jomaas, Grunde, Boertmann, David M., Wegeberg, Susse, and Gustavson, Kim

Abstract

It is well known, that in case of oil spill, seabirds are among the groups of animals most vulnerable. Even small amounts of oil can have lethal effects by destroying the waterproofing of their plumage, leading to loss of insulation and buoyancy. In the Arctic these impacts are intensified. To protect seabirds, a rapid removal of oil is crucial and in situ burning could be an efficient method. In the present work exposure effects of oil and burn residue in different doses was studied on seabird feathers from legally hunted Common eider (Somateria mollissima) by examining changes in total weight of the feather and damages on the microstructure (Amalgamation Index) of the feathers before and after exposure. The results of the experiments indicate that burn residues from in situ burning of an oil spill have similar or larger fouling and damaging effects on seabird feathers, as compared to fresh oil.

Published
2016

15. Why is the last Thick-billed Murre Uria lomvia colony in central West Greenland heading for extinction?

Author

MERKEL, FLEMMING, BOERTMANN, DAVID, FALK, KNUD, FREDERIKSEN, MORTEN, JOHANSEN, KASPER, LABANSEN, AILI LAGE, LINNEBJERG, JANNIE FRIES, MOSBECH, ANDERS, and SONNE, CHRISTIAN

Abstract

Ritenbenk/Innaq in Disko Bay is the only remaining Thick-billed Murre colony in central West Greenland. It has declined by 72% since 1980 and now (2012) holds c.1,100 breeding pairs. In 2005–2006 and 2011–2012, a number of studies were carried out in this colony to improve our understanding of the population decline and its causes. Hunting has previously been identified as a problem for the colony, but local breeding conditions have never been studied and the non-breeding distribution was known only from ringing. Our studies showed that breeding success was moderate to good in the Ritenbenk colony and apparently not limited by food availability. The impact of gull predation was more uncertain, but seemed limited in our study plot. In contrast, estimates of maximum sustainable harvest levels showed that hunting, including illegal activities, was and still is too high and probably can explain much of the population decline. It is puzzling though, that the steepest population decline was observed within the most recent decade when the harvest level was markedly reduced. This may indicate that something else besides hunting mortality affects the colony. The winter distribution of the Ritenbenk birds includes areas in the central North Atlantic, such as the waters around South Greenland, where conditions have been identified as potentially deteriorating due to pronounced oceanographic changes. The potential impact on the Ritenbenk colony, as well as other colonies in the North Atlantic, needs to be studied further. [ABSTRACT FROM PUBLISHER]

Published
2016
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