Distribution of substance P reveals a novel subdivision in the hippocampus of parasitic South American cowbirds

The Journal of Comparative Neurology
Radha G Nair-RobertsA Kacelnik

Abstract

Parasitic cowbirds monitor potential hosts' nests and return to lay when appropriate, a task that is likely to involve spatial recall. Seasonal and sexual behavioral variations in the cowbirds correlate with anatomical changes in the hippocampal formation. During the breeding season, parasites have larger hippocampal formations than nonparasites. In parasitic species in which females alone perform nest bookkeeping, females have larger hippocampal formations than males. We investigated the distribution of the neuropeptide substance P (SP) in three sympatric cowbirds: two obligate parasites (shiny cowbird and screaming cowbird) and one nonparasite (bay-winged cowbird). Distribution of SP was similar to that in other songbirds, except for a previously undescribed field of dense SP-rich terminals within the hippocampus that we call the hippocampal SP terminal field (SPh). We found robust species differences in the volume of this new area, measured relative to the remainder of the telencephalon. SPh was largest in the generalist parasite (shiny cowbird) and smallest in the nonparasitic species (bay-winged cowbird). In the specialist parasite (screaming cowbird), SPh was smaller than in the generalist parasite but larger than in the ...Continue Reading

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Jan 10, 2009·The Journal of Comparative Neurology·Cary H LeungDonna L Maney
Mar 26, 2016·Frontiers in Psychology·Maxime Cauchoix, Alexis S Chaine
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Sep 28, 2020·Animal Cognition·Jimena Lois-MilevicichJuan Carlos Reboreda

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