A decrease in fledging body mass in common guillemot Uria aalge chicks in the Baltic Sea

Abstract

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 224:305-309 (2001) - doi:10.3354/meps224305 A decrease in fledging body mass in common guillemot Uria aalge chicks in the Baltic Sea Henrik Österblom1,*, Anders Bignert2, Thord Fransson3, Olof Olsson4 1Department of Vertebrate Zoology, 2Contaminant Research Group, and 3Bird Ringing Centre, Swedish Museum of Natural History, PO Box 50007, 104 05 Stockholm, Sweden 4Formas, PO Box 1206, 111 82 Stockholm, Sweden *E-mail: henrik.osterblom@nrm.se ABSTRACT: Chick fledging body mass of the common guillemots Uria aalge breeding at Stora Karlsö in the Baltic Sea between 1989 and 2000 were studied in order to reveal any effects of an increased abundance of their main prey species, sprat Sprattus sprattus. Chick fledging body mass has decreased during the study period, and so has the condition of sprat. The deteriorated condition of the prey is most probably responsible for the observed decreased fledging body mass in guillemot chicks. This study shows that the condition of fish preyed upon by seabirds, in addition to availability, may be an important factor when studying seabird-fish interactions. It is clearly indicated that changes in the sprat population, as a consequence of changes in the Baltic Sea, have affected common guillemot fledging body mass. KEY WORDS: Common guillemot · Uria aalge · Fledging body mass · Sprat · Baltic Sea Full text in pdf format PreviousExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 224. Online publication date: December 18, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research.