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• W2544503973 endingPage "126" @default.
• W2544503973 startingPage "111" @default.
• W2544503973 abstract "In many species, seasonal variation in grouping behavior is widespread, with shifts towards territoriality in the breeding season and grouping in the winter. Compared to the hormonal and neural mechanisms of seasonal territorial aggression, the mechanisms that promote seasonal grouping have received little attention. We collected brains in spring and winter from wild-caught males of two species of emberizid sparrows that seasonally flock (the field sparrow, <i>Spizella pusilla</i>, and the dark-eyed junco, <i>Junco hyemalis</i>) and two species that do not seasonally flock (the song sparrow, <i>Melospiza melodia</i>, and the eastern towhee, <i>Pipilo erythrophthalmus</i>). We used receptor autoradiography to quantify seasonal plasticity in available binding sites for three neuropeptides known to influence social behavior. We examined binding sites for ¹²⁵I-vasoactive intestinal polypeptide (VIP), ¹²⁵I-sauvagine (SG, a ligand for corticotropin-releasing hormone receptors) and ¹²⁵I-ornithine vasotocin analog (OVTA, a ligand for the VT3 nonapeptide). For all species and ligands, brain areas that exhibited a seasonal pattern in binding density were characterized by a winter increase. Compared to nonflocking species, seasonally flocking species showed different binding patterns in multiple brain areas. Furthermore, we found that winter flocking was associated with elevated winter ¹²⁵I-VIP binding density in the medial amygdala, as well as ¹²⁵I-VIP and ¹²⁵I-OVTA binding density in the rostral arcopallium. While the functional significance of the avian rostral arcopallium is unclear, it may incorporate parts of the pallial amygdala. Our results point to this previously undescribed area as a likely hot spot of social modulation." @default.
• W2544503973 created "2016-11-04" @default.
• W2544503973 creator A5004513810 @default.
• W2544503973 creator A5012232244 @default.
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• W2544503973 date "2016-01-01" @default.
• W2544503973 modified "2023-09-23" @default.
• W2544503973 title "Seasonal Variation in Group Size Is Related to Seasonal Variation in Neuropeptide Receptor Density" @default.
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• W2544503973 doi "https://doi.org/10.1159/000448372" @default.
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• W2544503973 hasPublicationYear "2016" @default.
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