Effects of Testosterone and Photoperiodic Condition on Song Production and Vocal Control Region Volumes in Adult Male Dark-Eyed Juncos (Junco hyemalis)

2001 ◽  
Vol 39 (2) ◽  
pp. 95-105 ◽  
Author(s):  
Stephanie M. Dloniak ◽  
Pierre Deviche
Keyword(s):  
Control Region ◽  
Adult Male ◽  
Junco Hyemalis ◽  
Photoperiodic Condition ◽  
Vocal Control ◽  
Song Production

scholarly journals Carbachol-Induced Reduction in the Activity of Adult Male Zebra Finch RA Projection Neurons

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Wei Meng ◽  
Song-Hua Wang ◽  
Dong-Feng Li
Keyword(s):  
Membrane Potential ◽  
Adult Male ◽  
Motor Behavior ◽  
Membrane Conductance ◽  
Resting Membrane Potential ◽  
Projection Neurons ◽  
Cholinergic Modulation ◽  
Cholinergic Mechanism ◽  
Song Production

Cholinergic mechanism is involved in motor behavior. In songbirds, the robust nucleus of the arcopallium (RA) is a song premotor nucleus in the pallium and receives cholinergic inputs from the basal forebrain. The activity of projection neurons in RA determines song motor behavior. Although many evidences suggest that cholinergic system is implicated in song production, the cholinergic modulation of RA is not clear until now. In the present study, the electrophysiological effects of carbachol, a nonselective cholinergic receptor agonist, were investigated on the RA projection neurons of adult male zebra finches through whole-cell patch-clamp techniques in vitro. Our results show that carbachol produced a significant decrease in the spontaneous and evoked action potential (AP) firing frequency of RA projection neurons, accompanying a hyperpolarization of the membrane potential, an increase in the evoked AP latency, afterhyperpolarization (AHP) peak amplitude, and AHP time to peak, and a decrease in the membrane input resistance, membrane time constant, and membrane capacitance. These results indicate that carbachol reduces the activity of RA projection neurons by hyperpolarizing the resting membrane potential and increasing the AHP and the membrane conductance, suggesting that the cholinergic modulation of RA may play an important role in song production.

Central prolactin binding site densities change seasonally in an adult male passerine bird (Junco hyemalis)

2020 ◽  
Vol 106 ◽  
pp. 101786
Author(s):  
Kristina O. Smiley ◽  
John D. Buntin ◽  
Cynthia Corbitt ◽  
Pierre Deviche
Keyword(s):  
Binding Site ◽  
Adult Male ◽  
Passerine Bird ◽  
Junco Hyemalis

Plasticity in adult development: experience with young males enhances mating competence in adult male cowbirds, Molothrus ater

Behaviour ◽  
2002 ◽  
Vol 139 (6) ◽  
pp. 713-728 ◽  
Author(s):  
David White ◽  
Andrew P.King ◽  
Meredith West
Keyword(s):  
Social Environment ◽  
Adult Development ◽  
Adult Male ◽  
Adult Males ◽  
Young Males ◽  
The Social ◽  
Mating Opportunities ◽  
Song Production ◽  
Juvenile Males

AbstractThe social environment can play an important role in organizing organisms' behavioural development. We studied the effect on adult male cowbirds' communication and mating-related behaviour of being housed in social groups with juvenile males. In two large outdoor aviaries, we housed adult males, juvenile females and adult females either with or without juvenile males. Conditions remained intact from September 1999 through the first half of the breeding season in May 2000. We observed them throughout this time, documenting singing interactions, patterns of affiliation, and song production. We then brought the two groups of adult males together by rotating individuals from the groups into a mating competency tournament, allowing the males to compete with each other for mating opportunities with a new group of females. Throughout the study prior to the mating competency test, there were few differences among adult males in the two conditions as measured by amount and use of song, the quality of their songs, or number of copulations they received. In the mating competency tournament however, significant differences among males in the two conditions emerged. Compared with adult males that had been housed without juvenile males, adult males that had formerly been housed with juvenile males were more successful in the mating competition as measured by: success in getting copulations, number of copulations received, and latency to get copulations. They also engaged in more male-male singing interactions. These results provide evidence to suggest that development of mating competency is malleable throughout life in response to the social environment that individuals experience.

MEIOTIC EVIDENCE FOR PERICENTRIC INVERSION POLYMORPHISM IN JUNCO (AVES)

1976 ◽  
Vol 18 (4) ◽  
pp. 747-751 ◽  
Author(s):  
Gerald F. Shields
Keyword(s):  
Adult Male ◽  
Pericentric Inversion ◽  
Inversion Polymorphism ◽  
Junco Hyemalis ◽  
Pericentric Inversions

Species of the genus Junto are polymorphic for chromosomes 2 and 5. Diplotene karyotypes of 61 adult male Dark-eyed Juncos, Junco hyemalis, were analyzed in order to determine the basis of the polymorphisms. Individuals carrying heterozygous bivalents of the polymorphic chromosomes have fewer chiasma than homozygous individuals. These data suggest that two separate pericentric inversions are at the basis of the polymorphisms.

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