Linked Life Data

19425044

Source:http://linkedlifedata.com/resource/pubmed/id/19425044

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2009-7-8
pubmed:abstractText
The extent to which changing day lengths (DLs) synchronize the seasonal molt was assessed in nine cohorts of male and female Siberian hamsters (Phodopus sungorus) born into a simulated natural photoperiod (SNP) beginning 4 weeks before and ending 12 weeks after the summer solstice. Hamsters in early cohorts displayed rapid somatic and gonadal growth and early puberty, whereas those in later cohorts delayed puberty until the next spring. Despite the varying birth dates and puberty strategies, the seasonal pattern of change in pelage is much better predicted by calendar date than by age in both sexes. Males born over the course of 16 weeks first made the transition to the winter pelage during a 5-week interval beginning on October 25; the autumn molt, however, was not significantly synchronized by either age or calendar date. The autumn molt of females on the other hand began 2 weeks later, and was significantly synchronized to calendar date with no detectable age effects. In both sexes, the autumn molt lagged gonadal and somatic seasonal changes by many weeks. Date of birth did not affect the timing of the spring molt, which was significantly synchronized by calendar date in both sexes. Incrementally changing photoperiods exert a strong organizing effect on the seasonal molt by providing hamsters with timing cues that are absent in laboratory analyses that employ static DLs and abrupt transitions from summer to winter DLs, thereby extending and validating conclusions derived from previous analyses.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1932-5223
pubmed:author
pubmed:copyrightInfo
2009 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
311
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
475-82
pubmed:dateRevised
2009-10-5
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus).
pubmed:affiliation
Department of Integrative Biology, University of California, Berkeley, California, USA. mb3024@columbia.edu
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural