Apr 29, 2020

Fast and furious: host aggression modulates behaviour of brood parasites

BioRxiv : the Preprint Server for Biology
Vaclav JelinekM. Honza

Abstract

Avian brood parasites pose a serious threat for hosts, substantially reducing their fitness which selects for the evolution of host defences. A classic example of a host frontline defence is mobbing which frequently includes contact attacking of brood parasites. Here, we investigated how the nest defence of a very aggressive great reed warbler (Acrocephalus arundinaceus) host influences the speed of egg-laying and egg-removing behaviour of its brood parasite - the common cuckoo (Cuculus canorus). We video-recorded 168 brood parasitic events at 102 active host nests and found that cuckoos avoided host mobbing in only 62% of cases. If hosts spotted the cuckoo at their nests, they almost always attacked it (in 91 of 104 cases), however, such attacks only rarely and temporarily prevented cuckoos from parasitizing (11 additional cases). When attacked, cuckoos parasitized host nests significantly faster and left them immediately. However, when not attacked, cuckoos frequently stayed at or near the nest suggesting that host aggression, rather than the risk of being spotted, influences the speed of brood parasitism in this species. Further, we found that cuckoos performed egg-removing behaviour in all parasitic events without regard to...Continue Reading

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Mentioned in this Paper

Avoidance
Immune Response
Virus
Influenza A Virus, H3N8 Subtype
Anas platyrhynchos
Pathogenic Organism
Antibody Titer Measurement
Anas platyrhynchos platyrhynchos
Antigens
Influenza A virus

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