7 results on '"Helgason, Hálfdán H."'
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2. Seabirds reveal mercury distribution across the North Atlantic
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Albert, Céline, primary, Moe, Børge, additional, Strøm, Hallvard, additional, Grémillet, David, additional, Brault-Favrou, Maud, additional, Tarroux, Arnaud, additional, Descamps, Sébastien, additional, Bråthen, Vegard Sandøy, additional, Merkel, Benjamin, additional, Åström, Jens, additional, Amélineau, Françoise, additional, Angelier, Frédéric, additional, Anker-Nilssen, Tycho, additional, Chastel, Olivier, additional, Christensen-Dalsgaard, Signe, additional, Danielsen, Johannis, additional, Elliott, Kyle, additional, Erikstad, Kjell Einar, additional, Ezhov, Alexey, additional, Fauchald, Per, additional, Gabrielsen, Geir W., additional, Gavrilo, Maria, additional, Hanssen, Sveinn Are, additional, Helgason, Hálfdán H., additional, Johansen, Malin Kjellstadli, additional, Kolbeinsson, Yann, additional, Krasnov, Yuri, additional, Langset, Magdalene, additional, Lemaire, Jérémy, additional, Lorentsen, Svein-Håkon, additional, Olsen, Bergur, additional, Patterson, Allison, additional, Plumejeaud-Perreau, Christine, additional, Reiertsen, Tone K., additional, Systad, Geir Helge, additional, Thompson, Paul M., additional, Lindberg Thórarinsson, Thorkell, additional, Bustamante, Paco, additional, and Fort, Jérôme, additional
- Published
- 2024
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3. Multi‐colony tracking of two pelagic seabirds with contrasting flight capability illustrates how windscapes shape migratory movements at an ocean‐basin scale
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Amélineau, Françoise, Tarroux, Arnaud, Lacombe, Simon, Bråthen, Vegard S., Descamps, Sebastien, Ekker, Morten, Fauchald, Per, Johansen, Malin K., Moe, Børge, Anker‐Nilssen, Tycho, Bogdanova, Maria I., Bringsvor, Ingar S., Chastel, Olivier, Christensen‐Dalsgaard, Signe, Daunt, Francis, Dehnhard, Nina, Einar Erikstad, Kjell, Ezhov, Aleksey, Gavrilo, Maria, Hansen, Erpur S., Harris, Mike P., Helgason, Hálfdán H., Langset, Magdalene, Léandri‐Breton, Don‐Jean, Lorentsen, Svein‐Håkon, Merkel, Benjamin, Newell, Mark, Olsen, Bergur, Reiertsen, Tone K., Systad, Geir H.R., Thorarinsson, Thorkell L., Åström, Jens, Strøm, Hallvard, Amélineau, Françoise, Tarroux, Arnaud, Lacombe, Simon, Bråthen, Vegard S., Descamps, Sebastien, Ekker, Morten, Fauchald, Per, Johansen, Malin K., Moe, Børge, Anker‐Nilssen, Tycho, Bogdanova, Maria I., Bringsvor, Ingar S., Chastel, Olivier, Christensen‐Dalsgaard, Signe, Daunt, Francis, Dehnhard, Nina, Einar Erikstad, Kjell, Ezhov, Aleksey, Gavrilo, Maria, Hansen, Erpur S., Harris, Mike P., Helgason, Hálfdán H., Langset, Magdalene, Léandri‐Breton, Don‐Jean, Lorentsen, Svein‐Håkon, Merkel, Benjamin, Newell, Mark, Olsen, Bergur, Reiertsen, Tone K., Systad, Geir H.R., Thorarinsson, Thorkell L., Åström, Jens, and Strøm, Hallvard
- Abstract
Migration is a common trait among many animals allowing the exploitation of spatiotemporally variable resources. It often implies high energetic costs to cover large distances, for example between breeding and wintering grounds. For flying or swimming animals, the adequate use of winds and currents can help reduce the associated energetic costs. Migratory seabirds are good models because they dwell in habitats characterized by strong winds while undertaking very long migrations. We tested the hypothesis that seabirds migrate through areas with favourable winds. To that end, we used the SEATRACK dataset, a multi-colony geolocator tracking dataset, for two North Atlantic seabirds with contrasting flight capabilities, the black-legged kittiwake Rissa tridactyla and the Atlantic puffin Fratercula arctica, and wind data from the ERA5 climate reanalysis model. Both species had on average positive wind support during migration. Their main migratory routes were similar and followed seasonally prevailing winds. The general migratory movement had a loop-shape at the scale of the North Atlantic, with an autumn route (southward) along the east coast of Greenland, and a spring route (northward) closer to the British Isles. While migrating, both species had higher wind support in spring than in autumn. Kittiwakes migrated farther and benefited from higher wind support than puffins on average. The variation in wind conditions encountered while migrating was linked to the geographical location of the colonies. Generally, northernmost colonies had a better wind support in autumn while the southernmost colonies had a better wind support in spring, with some exceptions. Our study helps understanding how the physical environment shapes animal migration, which is crucial to further predict how migrants will be impacted by ongoing environmental changes.
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- 2024
4. Multi‐colony tracking of two pelagic seabirds with contrasting flight capability illustrates how windscapes shape migratory movements at an ocean‐basin scale
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Amélineau, Françoise, primary, Tarroux, Arnaud, additional, Lacombe, Simon, additional, Bråthen, Vegard S., additional, Descamps, Sebastien, additional, Ekker, Morten, additional, Fauchald, Per, additional, Johansen, Malin K., additional, Moe, Børge, additional, Anker‐Nilssen, Tycho, additional, Bogdanova, Maria I., additional, Bringsvor, Ingar S., additional, Chastel, Olivier, additional, Christensen‐Dalsgaard, Signe, additional, Daunt, Francis, additional, Dehnhard, Nina, additional, Einar Erikstad, Kjell, additional, Ezhov, Aleksey, additional, Gavrilo, Maria, additional, Hansen, Erpur S., additional, Harris, Mike P., additional, Helgason, Hálfdán H., additional, Langset, Magdalene, additional, Léandri‐Breton, Don‐Jean, additional, Lorentsen, Svein‐Håkon, additional, Merkel, Benjamin, additional, Newell, Mark, additional, Olsen, Bergur, additional, Reiertsen, Tone K., additional, Systad, Geir H. R., additional, Thorarinsson, Thorkell L., additional, Åström, Jens, additional, and Strøm, Hallvard, additional
- Published
- 2023
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5. North Atlantic winter cyclones starve seabirds
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Clairbaux, Manon, primary, Mathewson, Paul, additional, Porter, Warren, additional, Fort, Jérôme, additional, Strøm, Hallvard, additional, Moe, Børge, additional, Fauchald, Per, additional, Descamps, Sebastien, additional, Helgason, Hálfdán H., additional, Bråthen, Vegard S., additional, Merkel, Benjamin, additional, Anker-Nilssen, Tycho, additional, Bringsvor, Ingar S., additional, Chastel, Olivier, additional, Christensen-Dalsgaard, Signe, additional, Danielsen, Jóhannis, additional, Daunt, Francis, additional, Dehnhard, Nina, additional, Erikstad, Kjell Einar, additional, Ezhov, Alexey, additional, Gavrilo, Maria, additional, Krasnov, Yuri, additional, Langset, Magdalene, additional, Lorentsen, Svein-H., additional, Newell, Mark, additional, Olsen, Bergur, additional, Reiertsen, Tone K., additional, Systad, Geir Helge, additional, Thórarinsson, Thorkell L., additional, Baran, Mark, additional, Diamond, Tony, additional, Fayet, Annette L., additional, Fitzsimmons, Michelle G., additional, Frederiksen, Morten, additional, Gilchrist, Hugh G., additional, Guilford, Tim, additional, Huffeldt, Nicholas P., additional, Jessopp, Mark, additional, Johansen, Kasper L., additional, Kouwenberg, Amy-Lee, additional, Linnebjerg, Jannie F., additional, Major, Heather L., additional, Tranquilla, Laura McFarlane, additional, Mallory, Mark, additional, Merkel, Flemming R., additional, Montevecchi, William, additional, Mosbech, Anders, additional, Petersen, Aevar, additional, and Grémillet, David, additional
- Published
- 2021
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6. North Atlantic winter cyclones starve seabirds
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Clairbaux, Manon, Mathewson, Paul, Porter, Warren, Fort, Jérôme, Strøm, Hallvard, Moe, Børge, Fauchald, Per, Descamps, Sebastien, Helgason, Hálfdán H., Bråthen, Vegard S., Merkel, Benjamin, Anker-Nilssen, Tycho, Bringsvor, Ingar S., Chastel, Olivier, Christensen-Dalsgaard, Signe, Danielsen, Jóhannis, Daunt, Francis, Dehnhard, Nina, Erikstad, Kjell Einar, Ezhov, Alexey, Gavrilo, Maria, Krasnov, Yuri, Langset, Magdalene, Lorentsen, Svein-H., Newell, Mark, Olsen, Bergur, Reiertsen, Tone K., Systad, Geir Helge, Thórarinsson, Thorkell L., Baran, Mark, Diamond, Tony, Fayet, Annette L., Fitzsimmons, Michelle G., Frederiksen, Morten, Gilchrist, Hugh G., Guilford, Tim, Huffeldt, Nicholas P., Jessopp, Mark, Johansen, Kasper L., Kouwenberg, Amy-Lee, Linnebjerg, Jannie F., Major, Heather L., Tranquilla, Laura McFarlane, Mallory, Mark, Merkel, Flemming R., Montevecchi, William, Mosbech, Anders, Petersen, Aevar, Grémillet, David, Clairbaux, Manon, Mathewson, Paul, Porter, Warren, Fort, Jérôme, Strøm, Hallvard, Moe, Børge, Fauchald, Per, Descamps, Sebastien, Helgason, Hálfdán H., Bråthen, Vegard S., Merkel, Benjamin, Anker-Nilssen, Tycho, Bringsvor, Ingar S., Chastel, Olivier, Christensen-Dalsgaard, Signe, Danielsen, Jóhannis, Daunt, Francis, Dehnhard, Nina, Erikstad, Kjell Einar, Ezhov, Alexey, Gavrilo, Maria, Krasnov, Yuri, Langset, Magdalene, Lorentsen, Svein-H., Newell, Mark, Olsen, Bergur, Reiertsen, Tone K., Systad, Geir Helge, Thórarinsson, Thorkell L., Baran, Mark, Diamond, Tony, Fayet, Annette L., Fitzsimmons, Michelle G., Frederiksen, Morten, Gilchrist, Hugh G., Guilford, Tim, Huffeldt, Nicholas P., Jessopp, Mark, Johansen, Kasper L., Kouwenberg, Amy-Lee, Linnebjerg, Jannie F., Major, Heather L., Tranquilla, Laura McFarlane, Mallory, Mark, Merkel, Flemming R., Montevecchi, William, Mosbech, Anders, Petersen, Aevar, and Grémillet, David
- Abstract
Each winter, the North Atlantic Ocean is the stage for numerous cyclones, the most severe ones leading to seabird mass-mortality events called “winter wrecks.” During these, thousands of emaciated seabird carcasses are washed ashore along European and North American coasts. Winter cyclones can therefore shape seabird population dynamics by affecting survival rates as well as the body condition of surviving individuals and thus their future reproduction. However, most often the geographic origins of impacted seabirds and the causes of their deaths remain unclear. We performed the first ocean-basin scale assessment of cyclone exposure in a seabird community by coupling winter tracking data for ∼1,500 individuals of five key North Atlantic seabird species (Alle alle, Fratercula arctica, Uria aalge, Uria lomvia, and Rissa tridactyla) and cyclone locations. We then explored the energetic consequences of different cyclonic conditions using a mechanistic bioenergetics model and tested the hypothesis that cyclones dramatically increase seabird energy requirements. We demonstrated that cyclones of high intensity impacted birds from all studied species and breeding colonies during winter but especially those aggregating in the Labrador Sea, the Davis Strait, the surroundings of Iceland, and the Barents Sea. Our broad-scale analyses suggested that cyclonic conditions do not increase seabird energy requirements, implying that they die because of the unavailability of their prey and/or their inability to feed during cyclones. Our study provides essential information on seabird cyclone exposure in a context of marked cyclone regime changes due to global warming.
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- 2021
7. Contrasting Spatial and Seasonal Trends of Methylmercury Exposure Pathways of Arctic Seabirds: Combination of Large-Scale Tracking and Stable Isotopic Approaches
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Renedo, Marina, primary, Amouroux, David, additional, Albert, Céline, additional, Bérail, Sylvain, additional, Bråthen, Vegard S., additional, Gavrilo, Maria, additional, Grémillet, David, additional, Helgason, Hálfdán H., additional, Jakubas, Dariusz, additional, Mosbech, Anders, additional, Strøm, Hallvard, additional, Tessier, Emmanuel, additional, Wojczulanis-Jakubas, Katarzyna, additional, Bustamante, Paco, additional, and Fort, Jérôme, additional
- Published
- 2020
- Full Text
- View/download PDF
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