<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Here we present the results of candling 258 eggs from 50 nests of Common Eiders <italic>Somateria mollissima</italic> in a colony in the central Baltic. Of these, 223 (86%) had a developing foetus. Among the 35 (14%) failed eggs, 15 were unfertilized and 20 contained a dead embryo. The prevalence of failed eggs is similar to the average proportion of failed eggs reported previously by the Christiansø Scientific Field Station during 1998–2014. The reason for the high percentage of failed eggs is unknown; however, low pre-incubation body mass and energetic stress is likely to be the main factor. In addition, we incubated 8 eggs in the laboratory from day 0 to hatch in order to follow the development and foetal morphology. This resulted in a field atlas from which it is possible to estimate date of incubation start using candling in early incubation (days 1–12). The atlas is a new possibility for field biologists to estimate the first day of incubation of breeding eiders and the prevalence of unfertilized and rotten eggs, which is important for studying their biology and population dynamics.</p></abstract>

Here we present the results of candling 258 eggs from 50 nests of Common Eiders Somateria mollissima in a colony in the central Baltic. Of these, 223 (86%) had a developing foetus. Among the 35 (14%) failed eggs, 15 were unfertilized and 20 contained a dead embryo. The prevalence of failed eggs is similar to the average proportion of failed eggs reported previously by the Christiansø Scientific Field Station during 1998–2014. The reason for the high percentage of failed eggs is unknown; however, low pre-incubation body mass and energetic stress is likely to be the main factor. In addition, we incubated 8 eggs in the laboratory from day 0 to hatch in order to follow the development and foetal morphology. This resulted in a field atlas from which it is possible to estimate date of incubation start using candling in early incubation (days 1–12). The atlas is a new possibility for field biologists to estimate the first day of incubation of breeding eiders and the prevalence of unfertilized and rotten eggs, which is important for studying their biology and population dynamics.

Candling and Field Atlas of Early Egg Development in Common Eiders <italic>Somateria Mollissima</italic> in the Central Baltic

Department of Bioscience, Arctic Research Centre (ARC)

Faculty of Health and Medical Sciences, Department of Veterinary and Animal Sciences

Acrocephalus

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Candling and Field Atlas of Early Egg Development in Common Eiders  in the Central Baltic

Here we present the results of candling 258 eggs from 50 nests of Common Eiders Somateria mollissima in a colony in the central Baltic. Of these, 223 (86%) had...

Candling and Field Atlas of Early Egg Development in Common Eiders Somateria Mollissima in the Central Baltic

Published Online: May 02, 2019

Page range: 85 - 90

Received: Sep 17, 2018

Accepted: Dec 12, 2018

DOI: https://doi.org/10.1515/acro-2018-0007

Keywords
Common Eider, Baltic, candling, fertilization, starvation, stress

© 2018 Svend-Erik Garbus et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Candling and Field Atlas of Early Egg Development in Common Eiders Somateria Mollissima in the Central Baltic

Published Online: May 02, 2019

Page range: 85 - 90

Received: Sep 17, 2018

Accepted: Dec 12, 2018

DOI: https://doi.org/10.1515/acro-2018-0007

KeywordsCommon Eider, Baltic, candling, fertilization, starvation, stress

© 2018 Svend-Erik Garbus et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Common Eider, Baltic, candling, fertilization, starvation, stress