Parental prey selection affects risk-taking behaviour and spatial learning in avian offspring.
Early nutrition shapes life history. Parents should, therefore, provide a diet that will optimize the nutrient intake of their offspring. In a number of passerines, there is an often observed, but unexplained, peak in spider provisioning during chick development. We show that the proportion of spiders in the diet of nestling blue tits, Cyanistes caeruleus, varies significantly with the age of chicks but is unrelated to the timing of breeding or spider availability. Moreover, this parental prey selection supplies nestlings with high levels of taurine particularly at younger ages. This amino acid is known to be both vital and limiting for mammalian development and consequently found in high concentrations in placenta and milk. Based on the known roles of taurine in mammalian brain development and function, we then asked whether by supplying taurine-rich spiders, avian parents influence the stress responsiveness and cognitive function of their offspring. To test this, we provided wild blue tit nestlings with either a taurine supplement or control treatment once daily from the ages of 2-14 days. Then pairs of size- and sex-matched siblings were brought into captivity for behavioural testing. We found that juveniles that had received additional taurine as neonates took significantly greater risks when investigating novel objects than controls. Taurine birds were also more successful at a spatial learning task than controls. Additionally, those individuals that succeeded at a spatial learning task had shown intermediate levels of risk taking. Non-learners were generally very risk-averse controls. Early diet therefore has downstream impacts on behavioural characteristics that could affect fitness via foraging and competitive performance. Fine-scale prey selection is a mechanism by which parents can manipulate the behavioural phenotype of offspring.
Arnold
Kathryn E
KE
Division of Environmental and Evolutionary Biology, Institute of Biomedical and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, UK. k.arnold@bio.gla.ac.uk
Ramsay
Scot L
SL
Donaldson
Christine
C
Adam
Aileen
A
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D004032:Diet; D007858:Learning / Q000502:physiology*; D008568:Memory; D046109:Passeriformes / Q000502:physiology*; D013037:Spatial Behavior / Q000502:physiology*; D013112:Spiders; D013654:Taurine
D013654:Taurine
Neurosci Biobehav Rev. 1999 Nov;23(7):925-35
10580307
Endocr Rev. 2000 Feb;21(1):55-89
10696570
J Perinat Med. 2002;30(4):281-6
12235714
Behav Neurosci. 2003 Jun;117(3):403-11
12802870
Neurosci Lett. 2003 Sep 11;348(2):120-2
12902033
Exp Gerontol. 2003 Sep;38(9):935-40
12954479
Proc Biol Sci. 2003 Aug 22;270(1525):1691-6
12964996
Adv Exp Med Biol. 2003;527:121-5
15206724
Brain Res Bull. 2004 Jul 15;63(6):491-7
15249114
Proc Biol Sci. 2004 Aug 7;271 Suppl 5:S347-9
15504014
Dev Psychobiol. 1983 Jul;16(4):287-301
6884578
Neurosci Lett. 1984 Dec 21;52(3):341-6
6395048
Physiol Rev. 1993 Jan;73(1):119-47
8419963
Behav Brain Res. 1993 Feb 26;53(1-2):127-31
8466658
Mol Ecol. 1998 Aug;7(8):1071-5
9711866
Q Rev Biol. 2004 Sep;79(3):241-77
15529965
Anim Cogn. 2005 Jul;8(3):211-4
15611879