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Visual discrimination of polymorphic nestlings in a cuckoo-host system.

Alfredo Attisano1, Nozomu J Sato2, Keita D Tanaka3

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Area of Science:

  • Evolutionary biology
  • Ornithology
  • Animal behavior

Background:

  • Avian brood parasitism drives evolutionary arms races between hosts and parasites.
  • Brood parasites often evolve to mimic host eggs and nestlings to avoid detection.
  • Host defenses can include recognizing and rejecting parasitic young, favoring uniformity within broods.

Purpose of the Study:

  • To investigate how host parents (Gerygone flavolateralis) visually recognize their own nestlings in a cuckoo-host system (Chalcites lucidus).
  • To determine if nestling skin color polymorphism in hosts and parasites influences recognition accuracy.
  • To assess the role of visual cues versus other sensory modalities in nestling identification.

Main Methods:

  • Comparative analysis of host and parasite nestling phenotypes (color, luminance, pattern).
  • Observation of host parental responses to own and parasite nestlings in monomorphic and polymorphic broods.
  • Assessment of visual differences between host morphs and parasite mimicry.

Main Results:

  • Both host and parasite nestlings exhibit bright and dark color phenotypes.
  • Parasite nestlings predominantly mimic the bright host morph.
  • Host parents successfully distinguished and rejected parasite nestlings from their own, irrespective of brood polymorphism.
  • The visual difference between host morphs was greater than the difference between the parasite and the mimicked host morph.

Conclusions:

  • Parasite mimicry is sophisticated, targeting multiple visual features of host nestlings.
  • Visual discrimination alone may be insufficient for accurate nestling recognition in polymorphic broods.
  • Host parents likely utilize additional non-visual sensory cues for nestling identification.
  • Nestling polymorphism may be an evolutionary relic with limited current impact on host-parasite recognition accuracy.