Divergence in problem-solving skills is associated with differential expression of glutamate receptors in wild finches
OPEN Science advances | 17 Mar 2018
JN Audet, L Kayello, S Ducatez, S Perillo, L Cauchard, JT Howard, LA O'Connell, ED Jarvis and L Lefebvre
Problem solving and innovation are key components of intelligence. We compare wild-caught individuals from two species that are close relatives of Darwin’s finches, the innovativeLoxigilla barbadensis, and its most closely related species in Barbados, the conservativeTiaris bicolor. We found an all-or-none difference in the problem-solving capacity of the two species. Brain RNA sequencing analyses revealed interspecific differences in genes related to neuronal and synaptic plasticity in the intrapallial neural populations (mesopallium and nidopallium), especially in the nidopallium caudolaterale, a structure functionally analogous to the mammalian prefrontal cortex. At a finer scale, we discovered robust differences in glutamate receptor expression between the species. In particular, the GRIN2B/GRIN2A ratio, known to correlate with synaptic plasticity, was higher in the innovativeL. barbadensis. These findings suggest that divergence in avian intelligence is associated with similar neuronal mechanisms to that of mammals, including humans.
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