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Rapid reduction in migration distance in relation to climate in a long-distance migratory bird Anders Pape MøLLER*, Tim VAN NUS, and Keith A. HOBSON Ecologie Systématique Evolution, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Orsay Cedex F-91405, France, Ministry of Education, Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing 100875, China, Chasséstraat 34-2, Amsterdam NL1057JG, The Netherlands, and Department—Biology and Environment and Climate Change Canada, University of Western Ontario, Room 2025 BGS Building, 1151 Richmond Street, London, ON, Canada N6A 5B7