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Hybrid chickadees are deficient in learning and memory.

Michael A McQuillan1, Timothy C Roth2, Alex V Huynh1

  • 1Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015.

Evolution; International Journal of Organic Evolution
|March 27, 2018
PubMed
Summary

Hybrid chickadees exhibit impaired learning and memory, suggesting these cognitive deficits act as a postzygotic barrier. This finding highlights the overlooked role of learning and memory in maintaining species.

Keywords:
Cognitionhybrid breakdownhybridizationpostzygotic reproductive isolationscatter hoardingspeciation

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Genetics

Background:

  • Postzygotic reproductive isolation is key to understanding species evolution.
  • Learning and memory are critical fitness traits, particularly in species relying on food caching.

Purpose of the Study:

  • To investigate if learning and memory abilities function as a postzygotic isolating barrier in chickadees.
  • To compare cognitive performance between two closely related species and their hybrids.

Main Methods:

  • Assessed associative learning and novel problem-solving in black-capped chickadees, Carolina chickadees, and their hybrids.
  • Utilized an outdoor aviary setting for behavioral experiments.

Main Results:

  • Hybrid chickadees demonstrated significantly poorer performance on spatial learning tasks.
  • Hybrids were less adept at solving novel problems compared to both parental species.

Conclusions:

  • Impaired learning and memory in hybrids may contribute to postzygotic reproductive isolation.
  • Cognitive traits like learning and memory could play a significant, underappreciated role in speciation.