Abstract
Parental investment (PI) theory assumes that optimal parental investment is a function of expected cost/benefit ratio of current versus future reproduction. This study tests the prediction of PI theory that in a species with high adult mortality, paying of reproductive costs can be induced or prevented by manipulation of brood reproductive value (RV). Analysis of recruitment rates in a 10-year study of great tits (Parus major) showed that brood RV was affected by both fledgling number and quality (body mass and tarsus length). A 4-year brood size manipulation experiment (±2 hatchlings) resulted in reduction of fledgling quality in enlarged versus control and reduced broods, while the fledgling number did not differ between manipulation categories due to increase of nestling mortality with brood size manipulation score. Hence, the experiment resulted in reduction of brood RVs in enlarged broods. Females rearing enlarged broods survived better than those with control and reduced broods, while male survival was not affected by the experiment. This indicates that paying the survival costs for reproduction was a part of normal life history for studied female great tits, and that decisions whether to pay this cost were based on the estimation of brood RV. Recruitment rate was lowest (but extremely male-biased) in reduced broods, while control and increased broods did not differ in the number of locally recaptured offspring.
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Acknowledgements
I thank Indrek Ots, Lea Tegelmann, Helen Vellau, Lauri Peil and several undergraduate students for the field assistance, and Toomas Tammaru, Nadav Nur and an anonymous referee for the constructive criticism on the manuscript. The study was financially supported by Estonian Science Foundation grant number 4537. The experiments comply with the current the laws of the Estonian Republic.
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Hõrak, P. When to pay the cost of reproduction? A brood size manipulation experiment in great tits (Parus major). Behav Ecol Sociobiol 54, 105–112 (2003). https://doi.org/10.1007/s00265-003-0608-1
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DOI: https://doi.org/10.1007/s00265-003-0608-1