First data on breeding success of Croatian inland colonies of Common Tern Sterna hirundo

Acrocephalus. 2019;40(180-181):97-103 DOI 10.1515/acro-2019-0007


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Journal Title: Acrocephalus

ISSN: 0351-2851 (Print); 2199-6067 (Online)

Publisher: Sciendo

Society/Institution: Bird Watching and Bird Study Association of Slovenia - DOPPS Bird Life

LCC Subject Category: Science: Zoology

Country of publisher: Poland

Language of fulltext: English, Slovenian

Full-text formats available: PDF



Martinović Miloš (Institute of Ornithology, Croatian Academy of Sciences and Arts, Gundulićeva 24, 10000 Zagreb, Croatia)

Kralj Jelena (Institute of Ornithology, Croatian Academy of Sciences and Arts, Gundulićeva 24, 10000 Zagreb, Croatia)

Rubinić Tomica (Public Institution Green Ring, 151. samoborske brigade HV 1, 10430 Samobor, Croatia)

Jurinović Luka (Croatian Veterinary Institute, Poultry Centre, Heinzelova 55, 10000 Zagreb, Croatia)

Petrović Ana (Pleternička 26, 31000 Osijek, Croatia)

Svetličić Ida (University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6 10000Zagreb, Croatia)


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Time From Submission to Publication: 16 weeks


Abstract | Full Text

In 2018 and 2019, the breeding success of two Common Tern colonies on artificial lakes near the River Sava in Zagreb, Croatia, was studied. The colonies were visited weekly from May to July and we collected data on phenology, number of breeding pairs, clutch size as well as egg and chick survival. We also conducted a comparison between early and late breeders. Hatching and fledging success was within previously observed ranges, apart from a low hatching success on Siromaja in 2019. The smaller colony on Siromaja had a higher productivity in both years than the colony on Rakitje, although in 2018 an avian pox virus killed much of the late chicks on Rakitje. Early breeders seem to have had higher hatching success and average clutch size. Furthermore, a greater proportion of them managed to hatch all their eggs compared to late breeders, but the differences were not statistically significant. Our study provided baseline data for future monitoring of phenology and breeding success with regard to the management of breeding colonies.