Experimental evidence of reciprocal altruism in the pied flycatcher |
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Authors: | Indrikis Krams Tatjana Krama Kristine Igaune Raivo Mänd |
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Institution: | (1) Institute of Systematic Biology, University of Daugavpils, 5401 Daugavpils, Latvia;(2) Institute of Zoology and Hydrobiology, University of Tartu, 51014 Tartu, Estonia |
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Abstract: | Although human behaviour abounds with reciprocal altruism, few examples exist documenting reciprocal altruism in animals.
Recent non-experimental evidence suggests that reciprocal altruism may be more common in nature than previously documented.
Here we present experimental evidence of mobbing behaviour, the joint assault on a predator in an attempt to drive it away,
as reciprocal altruism in the breeding pied flycatcher (Ficedula hypoleuca). Given a choice, pied flycatchers assisted in mobbing initiated by co-operating neighbours and did not join in mobbing when
initiated by conspecific neighbours which had defected from necessary assistance 1 h before. The results suggest the birds
followed a ‘tit-for-tat’-like strategy and that mobbing behaviour of breeding birds may be explained in terms of reciprocal
altruism. |
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Keywords: | Reciprocal altruism Co-operation Anti-predator behaviour Mobbing Pied flycatcher |
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