SEXUALLY DIMORPHIC SPATIAL-LEARNING VARIES SEASONALLY IN 2 POPULATIONS OF DEER MICE
SEXUALLY DIMORPHIC SPATIAL-LEARNING VARIES SEASONALLY IN 2 POPULATIONS OF DEER MICE
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DOI：
10.1016/0006-8993(94)91419-2
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发表时间：
1994-01-28
期刊：
影响因子：
2.9
通讯作者：
HARGREAVES, EL
中科院分区：
文献类型：
--
作者：
GALEA, LAM;KAVALIERS, M;HARGREAVES, EL
在Morris水迷宫任务中研究了光周期诱导的繁殖（生殖）和非繁殖（非生殖）成年雄性和雌性鹿小鼠（Peromyscus maniculatus）的空间学习。性成熟的成年雄性和雌性鹿鼠来自大陆种群（P. m. aretmisae）或岛屿人口（P. m. angustus）被要求学习水迷宫中隐藏的水下平台的空间位置。鹿鼠在繁殖季节（夏季;长日照）或非繁殖季节（冬季;短日照）进行了测试，在一天内共进行了6个区块的4次试验。保留进行了测试，两个探针试验发生后一天和三天收购。在繁殖季节，雄性空间任务的获得是上级优于雌性空间任务的获得两个群体。与此相反，在非繁殖季节有没有显着的性别差异，在空间收购的人口。这种性别二态性空间学习的变化是由于女性的空间性能下降，从非繁殖季节的繁殖季节和男性的空间性能增加在同一时期。这两个群体表现出类似的季节性变化，性二态水迷宫任务的表现。然而，有，总体人口差异，水迷宫任务的性能，与生态的小鼠，与岛屿小鼠显示较短的lavelets达到隐藏的平台比大陆鹿小鼠。有人建议，在鹿鼠的季节性变化的性激素水平的变化可能占两个种群的空间采集的季节性波动，这些变化差异影响的空间学习的雄性和雌性小鼠。
Spatial learning in photoperiodically induced breeding (reproductive) and non-breeding (non-reproductive) adult male and female deer mice (Peromyscus maniculatus) was examined in a Morris water-maze task. Sexually mature, adult male and female deer mice that were derived from either a mainland population (P. m. aretmisae) or an island population (P. m. angustus) were required to learn the spatial position of a hidden, submerged platform in a water maze. Deer mice were tested either during the breeding season (summer; long day photoperiod) or during the non-breeding season (winter; short day photoperiod) with a total of six blocks of four trials conducted in a single day. Retention was tested with two probe trials which occurred one and three days after acquisition. During the breeding season male spatial task acquisition was superior to female spatial task acquisition for both populations. In contrast, during the non-breeding season there were no significant sex differences in spatial acquisition for either population. This change in sexually dimorphic spatial learning was due to female spatial-performance decreasing from non-breeding season to the breeding season and male spatial-performance increasing over the same period. Both populations displayed similar seasonal variations in sexually dimorphic water-maze task performance. There were, however, overall population differences in water-maze task performance that were related to the ecology of the mice, with the insular mice displaying shorter latencies to reach the hidden platform than did the mainland deer mice. It is suggested that changes in the levels of sex hormones which vary across the season in deer mice may account for the seasonal fluctuations in spatial acquisition in both populations and that these changes differentially influence the spatial learning of male and female mice.