Oecologia

, Volume 137, Issue 4, pp 634–641 | Cite as

Sources and timing of calcium intake during reproduction in flycatchers

Behavioural Ecology

Abstract

Calcium availability may limit the reproductive output of birds and snail shells are considered to be the main source of calcium in many passerine species. This study of collared (Ficedula albicollis) and pied (F. hypoleuca) flycatchers evaluates calcium intake of a natural diet in Central Europe, and sex differences in the utilization of experimentally supplemented sources of calcium during the entire breeding period in aviary birds. The study provides the first evidence that successful reproduction of these species depends on the availability of woodlice (Isopoda) and millipedes (Diplopoda). Each of these two components provided about 3 times more calcium than the snail shells contained in a natural nestling diet. The breeding performance of aviary birds was poor when only snail shells and the fragments of eggshells were provided in food, i.e., irregular laying, smaller clutches, eggshell defects (25 of 53 eggs), and eggs dried-up during incubation. In contrast, no defective eggshell or dried-up eggs were found and the overall breeding performance increased 2–3 times when woodlice were added to the food. Females increased their intake of woodlice during both the pre-laying and laying periods, and both sexes did so during the nestling period. Both sexes took more woodlice in the evening than in the morning, independent of the nesting stage. Intake by females was low until 4 days before laying the first egg, then increased to the highest level, dropping immediately after laying the last egg. Intake of woodlice by both sexes increased steadily from hatching until the nestling age of about 10–12 days decreasing thereafter, which corresponds with the period of rapid skeletal growth. In contrast, the intake of mealworms increased until the nestling age of 13–14 days leveling off thereafter which corresponds with the growth curve of nestling body mass.

Keywords

Breeding success Diplopoda Egg laying Ficedula Isopoda 

Notes

Acknowledgements

This study was supported by a grant from GAČR (No. 206/03/0215) and the Czech Ministry of Education (MSM 153100012). We thank P. Kovařík, M. Krist, V. Pavel, V. Remeš and two anonymous referees for comments on the manuscript.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Laboratory of OrnithologyPalacky University771 46 OlomoucCzech Republic

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