pelagic seabird
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2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Philip Bertrand ◽  
Joël Bêty ◽  
Nigel G. Yoccoz ◽  
Marie-Josée Fortin ◽  
Hallvard Strøm ◽  
...  

AbstractIn colonially breeding marine predators, individual movements and colonial segregation are influenced by seascape characteristics. Tidewater glacier fronts are important features of the Arctic seascape and are often described as foraging hotspots. Albeit their documented importance for wildlife, little is known about their structuring effect on Arctic predator movements and space use. In this study, we tested the hypothesis that tidewater glacier fronts can influence marine bird foraging patterns and drive spatial segregation among adjacent colonies. We analysed movements of black-legged kittiwakes (Rissa tridactyla) in a glacial fjord by tracking breeding individuals from five colonies. Although breeding kittiwakes were observed to travel up to ca. 280 km from the colony, individuals were more likely to use glacier fronts located closer to their colony and rarely used glacier fronts located farther away than 18 km. Such variation in the use of glacier fronts created fine-scale spatial segregation among the four closest (ca. 7 km distance on average) kittiwake colonies. Overall, our results support the hypothesis that spatially predictable foraging patches like glacier fronts can have strong structuring effects on predator movements and can modulate the magnitude of intercolonial spatial segregation in central-place foragers.


2020 ◽  
Vol 30 (14) ◽  
pp. 2869-2873.e2 ◽  
Author(s):  
Joe Wynn ◽  
Oliver Padget ◽  
Henrik Mouritsen ◽  
Chris Perrins ◽  
Tim Guilford

2020 ◽  
Author(s):  
A.O. Debrot ◽  
◽  
N.H.B.M. Kaag ◽  
M.F. Leopold ◽  
J.T. van der Wal ◽  
...  

2019 ◽  
Vol 692 ◽  
pp. 382-392 ◽  
Author(s):  
Aneta Dorota Pacyna ◽  
Dariusz Jakubas ◽  
Anne N.M.A. Ausems ◽  
Marcin Frankowski ◽  
Żaneta Polkowska ◽  
...  

2019 ◽  
Vol 116 (43) ◽  
pp. 21629-21633 ◽  
Author(s):  
Oliver Padget ◽  
Geoff Stanley ◽  
Jay K. Willis ◽  
Annette L. Fayet ◽  
Sarah Bond ◽  
...  

While displacement experiments have been powerful for determining the sensory basis of homing navigation in birds, they have left unresolved important cognitive aspects of navigation such as what birds know about their location relative to home and the anticipated route. Here, we analyze the free-ranging Global Positioning System (GPS) tracks of a large sample (n = 707) of Manx shearwater, Puffinus puffinus, foraging trips to investigate, from a cognitive perspective, what a wild, pelagic seabird knows as it begins to home naturally. By exploiting a kind of natural experimental contrast (journeys with or without intervening obstacles) we first show that, at the start of homing, sometimes hundreds of kilometers from the colony, shearwaters are well oriented in the homeward direction, but often fail to encode intervening barriers over which they will not fly (islands or peninsulas), constrained to flying farther as a result. Second, shearwaters time their homing journeys, leaving earlier in the day when they have farther to go, and this ability to judge distance home also apparently ignores intervening obstacles. Thus, at the start of homing, shearwaters appear to be making navigational decisions using both geographic direction and distance to the goal. Since we find no decrease in orientation accuracy with trip length, duration, or tortuosity, path integration mechanisms cannot account for these findings. Instead, our results imply that a navigational mechanism used to direct natural large-scale movements in wild pelagic seabirds has map-like properties and is probably based on large-scale gradients.


PLoS ONE ◽  
2019 ◽  
Vol 14 (8) ◽  
pp. e0219986
Author(s):  
Martin Berg ◽  
Jannie F. Linnebjerg ◽  
Graeme Taylor ◽  
Stefanie M. H. Ismar-Rebitz ◽  
Mike Bell ◽  
...  

2019 ◽  
Vol 89 (1) ◽  
pp. 29-43 ◽  
Author(s):  
Letizia Campioni ◽  
Maria Peixe Dias ◽  
José Pedro Granadeiro ◽  
Paulo Catry

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