Singing in the face of death: male banded wrens sing more to playback in their last breeding season

Journal of Avian Biology
M L HallSandra L. Vehrencamp

Abstract

Investment in signalling is subject to multiple trade-offs that vary with life-stage, leading to a complex relationship between survival and trait expression. We show a negative relationship between survival and song rate in response to simulated territorial intrusion in male banded wrens (Thryophilus pleurostictus), and test several explanations for this association. (1) Male age failed to explain the association: though age affected song rate in a cross-sectional analysis, longitudinal analysis showed that individuals did not increase their song rate as they got older. Reconciling these results suggests differential selection against young males that respond to intrusion with low song rates. (2) Mortality costs of high song rates did not appear to explain the negative relationship between song rate and survival because, though song rate in response to playback was condition-dependent, high song rates in a different context did not appear to impose mortality costs. (3) High levels of territorial pressure may have increased mortality, but were not associated with high song rates in response to playback. (4) Since song rates did not increase with age, but tended to increase only in the last year of life, we tentatively suggest t...Continue Reading

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Citations

Feb 15, 2013·Theory in Biosciences = Theorie in Den Biowissenschaften·Juhan Javoiš
Oct 5, 2012·Proceedings. Biological Sciences·Emily K Copeland, Kenneth M Fedorka
Apr 2, 2013·Behavioral Ecology and Sociobiology·S L VehrencampS R de Kort
May 21, 2013·Global Change Biology·Gabrielle M MillerPhilip L Munday
Jun 6, 2012·Animal Behaviour·Sat GavassaPhilip K Stoddard
Nov 25, 2014·Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology·Sandra L VehrencampJohn M Koltz

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