Document Detail


Photoperiodic time measurement in seasonal reproduction of the weaver bird (Ploceus philippinus).
MedLine Citation:
PMID:  6628974     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Use of a circadian clock in photoperiodic time measurement is demonstrated in the tropical photoperiodic weaver bird with the help of resonance, ahemeral, and asymmetrical skeleton photoperiods. Different asymmetrical skeleton photoperiods and seasonal scotophase scans indicate (1) that light entrains endogenous circadian rhythms (ECR) of photosensitivity and the position of the photoinducible phase shifts according to the length of the basic photoperiod, (2) a seasonal variation in response to asymmetrical skeleton photoperiods, and (3) dissociation in the two gonadotrophins LH and FSH and a possibility of two distinct ECRs of photosensitivity for LH and FSH. Annual phasing of the ECRs of photosensitivity of the two gonadotrophins and/or interaction of hormones might be involved in the seasonal reproduction and photosensitivity of this bird.
Authors:
S Pavgi; A Chandola
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  General and comparative endocrinology     Volume:  52     ISSN:  0016-6480     ISO Abbreviation:  Gen. Comp. Endocrinol.     Publication Date:  1983 Oct 
Date Detail:
Created Date:  1983-12-20     Completed Date:  1983-12-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370735     Medline TA:  Gen Comp Endocrinol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  126-33     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Birds / physiology*
Circadian Rhythm
Light
Male
Organ Size
Periodicity*
Reproduction*
Seasons
Testis / anatomy & histology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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