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The Origin of Autumn Colours by Coevolution

โœ Scribed by MARCO ARCHETTI

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
112 KB
Volume
205
Category
Article
ISSN
0022-5193

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โœฆ Synopsis

We lack an adaptive explanation for a striking phenomenon, that of bright colours displayed in autumn by the leaves of many deciduous trees. The usual explanation is that it is simply a non-adaptive secondary e!ect of leaf senescence. A game-theoretic model of biological signalling provides an adaptive hypothesis for autumn colours showing that they can be the result of a process of coevolution between insects and trees: if leaf colour acts as a warning indicator of the tree's vigour to autumn parasite insects, trees can gain advantage from the reduction of parasite load and insects can gain advantage from location of the most pro"table hosts to lay their eggs. The results of the model are consistent with Zahavi's handicap principle. Possible explanations for the origin of the system and evidence from natural history are discussed.

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