Upwind or downwind: the spring arrival of Arctic Terns Sterna paradisaea at Troms, north Norway
ForfatterBarrett, Robert T
Arctic Terns Sterna paradisaea have a record-long migration between their breeding grounds in the Arctic and wintering areas in the Antarctic. Nevertheless, return dtaes to north Norway were remarkably constant over a 35-y period (1981-2015), arriving in Troms within a 13-d time window in mid to late May. Since 1993, arrival dates have advanced by about four days. No relationships were found between arrival dates and large-scale weather proxies such as the North Atlantic Oscillation or sea temperatures, but when terns were approaching Troms, headwinds tended to delay arrivals whereas tailwinds advanced them.
This is an Accepted Manuscript of an article published by Taylor & Francis in "Ringing and Migration". Published version available at http://dx.doi.org/10.1080/03078698.2016.1190610.