Reed warblers discriminate cuckoos from sparrowhawks with graded alarm signals that attract mates and neighbours

@article{Welbergen2008ReedWD,
  title={Reed warblers discriminate cuckoos from sparrowhawks with graded alarm signals that attract mates and neighbours},
  author={Justin A. Welbergen and Nicholas Barry Davies},
  journal={Animal Behaviour},
  year={2008},
  volume={76},
  pages={811-822}
}

Figures and Tables from this paper

Oriental reed warbler (Acrocephalus orientalis) nest defence behaviour towards brood parasites and nest predators

There was a sex difference in rate of body attacks towards rufous morph common cuckoo, sparrowhawk and the spotted dove and thelocally absent parasite and predator, respectively, with females showing better ability to distinguish between these species than males.

Enemy Recognition of Reed Warblers (Acrocephalus scirpaceus): Threats and Reproductive Value Act Independently in Nest Defence Modulation

This work quantified the ability of reed warblers to discriminate among brood parasites, nestling predators and non-threatening species at different stages of the breeding cycle and determined whether variables that influence the value of offspring explain variation in the intensity of defence recorded during the egg and nestling stages.

Cuckoos Combat Socially Transmitted Defenses of Reed Warbler Hosts with a Plumage Polymorphism

The experiments reveal that social learning is specific to the cuckoo morph that neighbors mob, and suggest that selection for mimicry and polymorphisms comes not only from personal experience but also from social learning.

Heterospecific alarm-call recognition in two warbler hosts of common cuckoos

Heterospecific alarm-call recognition in response to parasitism by cuckoos was tested and it was found that BRW seemed to learn the association between parasite-related alarm calls of the ORW and the cuckoo by observing the process of ORW attackingcuckoos.

Alarm call‐based discrimination between common cuckoo and Eurasian sparrowhawk in a Chinese population of great tits

This study suggests that great tits are able to distinguish sparrowhawks from common cuckoos and convey relevant information in alarm calls by adjusting the number and combinations of notes of a single call type.

Common Cuckoo Nestling Adapts Its Begging Behavior to the Alarm Signaling System of a Host

It is elucidated that coevolution has selected the common cuckoo nestlings that adapt their begging behavior to the parent–offspring communication of alarm signaling in their host, oriental reed warblers.

Responses of cuckoo hosts to alarm signals of different nest intruders in non-nesting areas

It is found that the alarm calls given in response to different intruders incurred similar numbers of approaching species for both conspecific and interspecific birds, which implied that visual information may be needed for further confirmation of threats.

Rarely parasitized and unparasitized species mob and alarm call to cuckoos: implications for sparrowhawk mimicry by brood parasitic cuckoos

Recent experiments support the long-standing hypothesis that Common Cuckoos are mimics of Eurasian Sparrowhawks and suggest that mimicry benefits the cuckoos by reducing the intensity of mobbing they suffer near host nests, at least in some host populations, potentially increasing their access to the hosts' nests.

Female cuckoo calls misdirect host defences towards the wrong enemy

The results show that the female cuckoo enhances her success by manipulating a fundamental trade-off in host defences between clutch and self-protection.

Specific responses of cuckoo hosts to different alarm signals according to breeding stage: a test of the offspring value hypothesis

In general, the oriental reed warbler had consistently stronger responses to different alarm calls in the nestling stage than in the egg stage, supporting the offspring value hypothesis.
...

References

SHOWING 1-10 OF 76 REFERENCES

Are Blackcaps (Sylvia atricapilla) defending their nests also calling for help from their neighbours?

  • T. Grim
  • Environmental Science
    Journal of Ornithology
  • 2007
It is argued that this hypothesis is unlikely to apply to typical avian predators during nest predation acts because these only last for several seconds, and the observed pattern of the positive correlation between the intensity of nest defence and the number of attracted birds is most likely a proximate by-product of the conspicuous nest defence by Blackcaps.

Nest defence, enemy recognition and nest inspection behaviour of experimentally parasitized Reed Warblers Acrocephalus scirpaceus

Low aggression and non-specificity of host responses in the study area are in line with the fact that the Reed Warbler is an intermediate rejecter of Cuckoo eggs as expected from the spatial habitat structure hypothesis.

Responses of breeding Reed Warblers Acrocephalus scirpaceus to mounts of Sparrowhawk Accipiter nisus, Cuckoo Cuculus canorus and Jay Garrulus glandarius

Mounts of a Cuckoo Cuculus canorus, a Sparrowhawk Accipiter nisus and a Jay Garrulus glandarius were presented at nests of Reed Warbler Acrocephalus scirpaceus at all breeding stages to demonstrate that Reed Warblers can tell Cuckoos from Sparrowhawks, as can many non-host species.

Reed warblers guard against cuckoos and cuckoldry

It is concluded that male reed warblers do increase nest guarding in response to cuckoos, but only after their females have begun egg laying, when there are less likely to be costs in lost paternity.

Responses by breeding birds to heterospecific song and mobbing call playbacks under varying predation risk

Out results suggest that birds exploit heterospecific signals in their decision making but under the constraints of predation risk, but large bird species did not.

Functional reference in an alarm signal given during nest defence: seet calls of yellow warblers denote brood-parasitic brown-headed cowbirds

  • S. GillS. Sealy
  • Environmental Science
    Behavioral Ecology and Sociobiology
  • 2003
Yellow warblers seet called equally in situations that simulated low, medium and high risk of parasitism, which suggests that these calls did not vary with response urgency, and that cowbird parasitism was a strong selective pressure in the evolution of functional referentiality in the seet call of yellow warblers.

Diana monkey long-distance calls: messages for conspecifics and predators

It is concluded that, in addition to their function in perception advertisement, diana monkey long-distance calls function as within-group semantic signals that denote different types of predators.

Reactions of Four Passerine Species To Threats of Predation and Cowbird Parasitism: Enemy Recognition or Generalized Responses?

Four host species of the parasitic brown-headed cowbird were exposed to taxidermic mounts of a female cowbird, fox sparrow, and common grackle at their nests during their egg-laying or nestling stage and all of the hosts recognized the grackle as an enemy and increased their levels of defence from the laying to nestling stages.

Cost of mobbing call to breeding pied flycatcher, Ficedula hypoleuca

The results of the present study indicate that repeated conspicuous mobbing calls may carry a significant cost for birds during the breeding season.

Cuckoo–hawk mimicry? An experimental test

The first evidence that some small birds respond to common cuckoos Cuculus canorus as if they were sparrowhawks Accipiter nisus is provided, and tits showed similarly strong alarm to barred and unbarred hawks, and little alarms to barred doves, suggesting that naive small birds can mistake cuckoo for hawks.
...