Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus).
Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus).
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DOI：
10.1002/jez.544
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发表时间：
2009-08-01
影响因子：
2.8
通讯作者：
Zucker, Irving
中科院分区：
文献类型：
--
作者：
Butler, Matthew P.;Zucker, Irving
在9个队列的男性和女性西伯利亚仓鼠（Photopus sungorus）出生到一个模拟的自然光周期（SNP）开始4周前，夏至结束后12周，在不同的白天长度同步的季节性蜕皮的程度进行了评估。早期队列中的仓鼠表现出快速的躯体和性腺生长以及早期青春期，而后期队列中的仓鼠将青春期推迟到第二年春天。尽管不同的出生日期和青春期的策略，在毛皮的季节性变化模式是更好地预测日历日期比年龄在两性。在16周的过程中出生的男性首先在10月25日开始的5周间隔过渡到冬季毛皮;秋季蜕皮，但是，没有显着同步的年龄或日历日期。另一方面，秋季蜕皮的女性开始2周后，并显着同步日历日期没有检测到年龄的影响。在两种性别，秋季蜕皮落后于性腺和躯体的季节性变化了许多周。出生日期并不影响春季换羽的时间，两性的春季换羽时间与日历日期显着同步。逐渐变化的光周期对季节性蜕皮产生强烈的组织效应，为仓鼠提供了在实验室分析中不存在的时间线索，这些实验室分析采用静态日长和从夏季到冬季日长的突然过渡，从而扩展和验证了从以前的分析中得出的结论。
The extent to which changing day lengths 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 day lengths and abrupt transitions from summer to winter day lengths, thereby extending and validating conclusions derived from previous analyses.
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DOI：
10.1152/ajpregu.00146.2007
发表时间：
2007-07-01
影响因子：
2.8
作者：
Butler, Matthew P.;Turner, Kevin W.;Zucker, Irving
通讯作者：
Zucker, Irving
影响因子：
4.8
作者：
CARTER, DS;GOLDMAN, BD
通讯作者：
GOLDMAN, BD
影响因子：
4.8
作者：
MAYWOOD, ES;HASTINGS, MH
通讯作者：
HASTINGS, MH
DOI：
10.1152/ajpregu.00520.2007
发表时间：
2007-12-01
影响因子：
2.8
作者：
Paul, Matthew J.;George, Nicole T.;Butler, Matthew P.
通讯作者：
Butler, Matthew P.
影响因子：
--
作者：
SMALE, L;LEE, TM;ZUCKER, I
通讯作者：
ZUCKER, I