Migration patterns, population trends and morphometrics of the
Ruddy Turnstone Arenaria interpres passing Ottenby in south-
eastern Sweden Publikation/Tidskrift/Serie: Ornis Svecica
Förlag: Swedish Ornithological Society / Sveriges ornitologiska
förening We analysed 57 years’ uninterrupted trapping data of
autumn migrating Ruddy Turnstones Arenaria interpres at Ottenby,
south-eastern Sweden (1593 full-grown birds in 1947–2003; of
them 574 birds with standardised trapping in 1976–2003). Numbers
trapped decreased significantly for both adult and juvenile
birds in the total dataset (–0.34 and –0.57 ringed birds per
year), and for juveniles in the 1976–2003 dataset (–0.51 per
year). Median date for adults was 27 July and for juveniles 6
August. Adult females passed on average three days earlier than
adult males (females 27 July, males 30 July). The mean body
masses (juveniles 108.0 g, adults 108.4 g) correspond to a fuel
load of 21–22% in relation to lean body mass (89 g). Length of
stay of retrapped birds was onl