Winter feeding strategies of individually marked herons |
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| Institution: | 1. School of Computer and Software, Nanjing University of Information Science and Technology, Nanjing, China;2. Jiangsu Engineering Center of Network Monitoring, Nanjing University of Information Science and Technology, Nanjing, China;3. State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, China;4. School of Computer Science and Technology, Silicon Lake College, Suzhou, China;5. College of Engineering, Huaqiao University, Quanzhou, Fujian, China;6. School of Information Science and Engineering, Qufu Normal University, China;1. School of Power and Energy, Northwestern Polytechnical University, PR China;2. Shaanxi Key Laboratory of Internal Aerodynamics in Aero-engine, Xi''an, Shaanxi, PR China;1. Hospital Clínico Universitario de Valencia, Valencia, Spain;2. GEICAM (Grupo GEICAM de Investigación en Cáncer de Mama), Madrid, Spain;3. Centro de Investigación Biomédica en Red de Oncología, CIBERONC-ISCIII, Spain;4. Universidad de Valencia, Valencia, Spain;5. Instituto de Investigación Sanitaria INCLIVA, Valencia, Spain;6. MD Anderson Cancer Center, Houston, TX 77030, USA;7. IMIM Hospital del Mar Medical Research Institute; Barcelona, Spain;8. Medical Oncology Department Hospital del Mar, Barcelona, Barcelona, Spain;9. Hospital Provincial de Castellón, Castellón, Spain;10. Instituto Valenciano de Oncología, Valencia, Spain;11. Hospital Universitario Quirón de Madrid, Madrid, Spain;12. Hospital Virgen de la Salud, Toledo, Spain;13. Department of Systems Biology and Institute of Personalized Cancer Therapy, The University of Texas, USA;14. Complejo Hospitalario Universitario A Coruña, A Coruña, Spain;15. Hospital Clínico San Cecilio, Granada, Spain;p. Medical Oncology Department, Hospital Clínic of Barcelona, Barcelona, Spain;q. Fundación Jiménez Díaz, Madrid, Spain;r. Institut de Recerca Biomedica Barcelona, Spain;s. Universitat Pompeu Fabra, Barcelona, Spain;1. IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, 69360 Solaize (69), France;2. Dipartimento di Scienza Applicata e Tecnologia, Istituto di Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, TO, Italy;1. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Francisco, San Francisco, California;2. Department of Artificial Intelligence, Stanford University, Palo Alto, California |
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| Abstract: | The winter feeding behaviour of individually marked herons was studied in an estuarine habitat with adjacent streams in north-east Scotland. Feeding rates in the estuary were highest around low tide, and no feeding took place 3 h before and after low tide. Feeding rates at streams were significantly lower than in the estuary, but were constant throughout the day.Individual herons fed consistently with one of the following strategies: (1) feeding in a stream only: (2) feeding in the estuary only; or (3) switching between stream and estuary. The feeding rate was measured as a basis for a comparison of the benefits of alternative feeding strategies. A comparison between the three feeding strategies showed that herons that switched between estuary and streams achieved a significantly higher food intake than birds that used a stream feeding site only. The timing of arrival on the estuary and departure from the estuary to the streams was consistent with an energy maximization hypothesis. In midwinter, switchers were significantly heavier than non-switchers. |
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