NDLI: Nest defence in great tits Parus major: support for parental investment theory

Content Provider	Springer Nature Link
Author	Rytkönen, Seppo
Copyright Year	2002
Abstract	Parental investment (PI) theory predicts that parents should invest more in large than small broods and high- than low- quality offspring. These predictions were tested in relation to nest defence behaviour of great tits, Parus major, in northern Finland. We manipulated future benefits as a function of investment in current offspring using food supplementation, which resulted in manipulated broods having a greater number of larger-sized fledglings than control broods. Supplemented parents engaged in riskier nest defence behaviour than did non-supplemented parents. The result was independent of parental condition, suggesting that the expected costs of provisioning did not contribute to the result. Thus, great tit parents appear able to adjust their nest defence behaviour to the expected fitness value of their offspring, as predicted by the PI theory. On the other hand, the large manipulation effect on brood value was possible only because the breeding success of northern great tits is exceptionally low (50–60% of eggs produce fledglings, cf. 90% in mid-latitudes). This is due to food limitation during the nestling period, suggesting that great tit clutch adjustment strategies are not adapted to the harsh northern environment.
Starting Page	379
Ending Page	384
Page Count	6
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	52
Issue Number	5
e-ISSN	14320762
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-08-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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