The breeding biology of the Coal Tit Periparus ater in South Central Sweden

Authors

  • Karl Gustav Schölin
  • Hans Källander Department of Biology, Lund University

DOI:

https://doi.org/10.34080/os.v23.22567

Keywords:

breeding success, fledging success, brood size, timing of breeding, phenology

Abstract

In a nestbox study started in 1948 and still ongoing, the number of breeding Coal Tits Periparus ater was always low. Here we present data on time of egg laying and its advancement during the last three decades, clutch size, fledging success and proportion of second broods. Laying dates varied between 18 April and 10 May, with an overall mean of 5 May, and advanced by 0.36 days per year during the second half of the study. Mean clutch size was 8.55 (first clutches). A mean of 7.25 young fledged (all first broods) or 7.78 (failed first broods excluded). Second broods (12.6%) were often not checked but seven clutches had a mean size of 7.23 eggs and fledged 6.71 young.

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Published

2013-10-01

How to Cite

Schölin, K. G., & Källander, H. (2013). The breeding biology of the Coal Tit Periparus ater in South Central Sweden. Ornis Svecica, 23(3–4), 151–158. https://doi.org/10.34080/os.v23.22567

Issue

Section

Research Papers