Pulsed resources affect the timing of first breeding and lifetime reproductive success of tawny owls

The Journal of Animal Ecology
Alexandre MillonXavier Lambin

Abstract

1. According to life-history theory, environmental variability and costs of reproduction account for the prevalence of delayed reproduction in many taxa. Empirical estimates of the fitness consequences of different ages at first breeding in a variable environment are few however such that the contributions of environmental and individual variability remains poorly known. 2. Our objectives were to elucidate processes that underpin variation in delayed reproduction and to assess lifetime consequences of the age of first breeding in a site-faithful predator, the tawny owl Strix aluco L. subjected to fluctuating selection linked to cyclical variation in vole density (typically 3-year cycles with low, increasing and decreasing vole densities in successive years). 3. A multistate capture-recapture model revealed that owl cohorts had strikingly different juvenile survival prospects, with estimates ranging from 0.08 to 0.33 respectively for birds born in Decrease and Increase phases of the vole cycle. This resulted in a highly skewed population structure with >75% of local recruits being reared during Increase years. In contrast, adult survival remained constant throughout a vole cycle. The probability of commencing reproduction was lo...Continue Reading

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Citations

Jan 15, 2016·Evolution; International Journal of Organic Evolution·Emeline MourocqMichael Griesser
Apr 7, 2011·The Journal of Animal Ecology·Alexandre MillonXavier Lambin
Oct 13, 2011·American Journal of Physical Anthropology·Andrew M RobbinsMartha M Robbins
Oct 22, 2014·The Journal of Animal Ecology·Sarah R HoyXavier Lambin
Nov 18, 2014·The Journal of Animal Ecology·Ivar HerfindalAnders P Møller
Apr 3, 2015·Proceedings. Biological Sciences·Jean-François LemaîtreJean-Michel Gaillard
Aug 7, 2019·Biological Reviews of the Cambridge Philosophical Society·Alexandre MillonMichael Schaub
Apr 28, 2021·Ecology Letters·Shripad TuljapurkarJean-Michel Gaillard

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