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G. J. Sutton, C. A. Bost, A. Z. Kouzani, S. D. Adams, K. Mitchell, J. P. Y. Arnould |
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Title |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
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2021 |
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Marine Biology |
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168 |
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1 |
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3 |
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Abstract |
Difficulties quantifying in situ prey patch quality have limited our understanding of how marine predators respond to variation within and between patches, and throughout their foraging range. In the present study, animal-borne video, GPS, accelerometer and dive behaviour data loggers were used to investigate the fine-scale foraging behaviour of Macaroni penguins (Eudyptes chrysolophus) in response to prey type, patch density and temporal variation in diving behaviour. Individuals mainly dived during the day and utilised two strategies, targeting different prey types. Subantarctic krill (Euphausia vallentini) were consumed during deep dives, while small soft-bodied fish were captured on shallow dives or during the ascent phase of deep dives. Despite breeding in large colonies individuals seemed to be solitary foragers and did not engage with conspecifics in coordinated behaviour as seen in other group foraging penguin species. This potentially reflects the high abundance and low manoeuvrability of krill. Video data were used to validate prey capture signals in accelerometer data and a Support Vector Machine learning algorithm was developed to identify prey captures that occurred throughout the entire foraging trip. Prey capture rates indicated that Macaroni penguins continued to forage beyond the optimal give up time. However, bout-scale analysis revealed individuals terminated diving behaviour for reasons other than patch quality. These findings indicate that individuals make complex foraging decisions in relation to their proximate environment over multiple spatio-temporal scales. |
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1432-1793 |
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yes |
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2037 |
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Provost C. & Woppelmann G.L.E. |
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Rapport de mission: Campagne NIVMER-94- Marion Dufresne Crozet, Kerguelen, Amsterdam. |
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1994 |
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Rapport de mission |
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688 |
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2074 |
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Ducroz F. |
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Title |
Etude de la composition chimique de la basse atmosphère des régions côtières antarctiques(station française de dumont d'Urville). |
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1996 |
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299 |
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Thèse de doctorat de l'Université Joseph fourier-Grenoble |
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241 |
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yes |
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2077 |
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Touaty M. |
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Etude de la variabilité des hydrocarbures légers à l'Ile Amsterdam. |
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1995 |
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D.E.A. de 'Chimie de la pollution atmosphérique et physique de l'environnement', Université de Paris 7 |
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146 |
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yes |
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2098 |
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Hureau J.C., Koubbi P., Ozouf Costaz C., Pisano E. & Vacchi M. |
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Programme d'ichtyologie côtière en Terre Adélie (ICOTA). Rapport de la campagne 1995-96. |
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1997 |
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20 |
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Rapp.scient.IFRTP |
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281 |
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yes |
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2125 |
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Penneroux M. |
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Title |
Contribution à l'étude de la variabilité d'Ixodes uriae (Acari: Ixodidae): parasite d'oiseaux marins dans la région antarctique. |
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2001 |
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Thèse de Dotorat en pharmacie, Université de Rennes |
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136 |
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yes |
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2135 |
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Author |
Bodevin R. |
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Title |
Analyse génétique de populations d'*Ixodes uriae| : parasites d'oiseaux marins des îles australes. Utilisation des marqueurs microsatellites. |
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2001 |
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36 |
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Doctorat en Pharmacie, Rennes |
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136 |
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yes |
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2141 |
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Author |
Frenot Y. |
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Title |
Station infrason IS23 – CEA – Kerguelen : étude d'impact sur l'environnement. |
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2002 |
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10 |
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Rapport IFRTP, non publié, Paimpont |
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136 |
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yes |
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2144 |
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Author |
Doucet S. |
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Title |
Interactions rides-points chauds et originalité du chimisme de l'océan indien. Apport de l'étude géochimique et isotopique (Hf-Pb-Sr-Nd) des îles Kerguelen & Amsterdam-St.Paul. |
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2002 |
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245 |
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Thèse de Doctorat, Université Libre de Bruxelle et Université J. Monnet de St-E |
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251 |
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yes |
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2151 |
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Author |
Plenier G. |
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Fluctuations du champ paléomagnétique terrestre enregistrées par les laves de l'Archipel des Kerguelen (partie australe de l'océan indien) et détermination de leur direction de mise en place. |
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2002 |
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Thèse de Doctorat Université de Montpellier |
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310 |
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2165 |
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