摘要
The relationship between postures, sleep stages and eye state was established in two species of deer, the Indian sambar (Rusa unicolor) and sika deer (Cervus nippon), based on video recording. In both species, the state of rest or behavioral sleep was recorded in the sternal position, holding the head above the ground, and in the lateral position, with the head resting on the croup or on the ground. Rest accounted for at least 80% of the time in these positions. Based on behavior criteria a substantial portion of rest represented slow-wave sleep. Episodes of rapid eye movements (REM sleep) were recorded in the lateral position. They did not exceed 2 min. When the deer were in the sternal posture, they kept their eyes open most of the time: in average 96% of the time in sambars and 82% in sika deer. Episodes of the open eye in this posture lasted up to 8.4 min in sambars and up to 3.3 min in sika deer. In the lateral position, such episodes were 4 and 1.5 times shorter. Sleeping with open eyes in ungulates may be an important mechanism of maintaining vigilance.
摘要译文
姿势，睡眠阶段和眼科之间的关系是根据视频记录的两种鹿，印度山道（Rusa Unicolor）和Sika Deer（Cervus nippon）建立的。在这两个物种中，休息或行为睡眠的状态都记录在胸骨的位置，将头部固定在地面上方，并处于横向位置，头部放在臀部或地面上。在这些职位上，REST至少占80％的时间。根据行为标准，大部分休息代表了慢波睡眠。在横向位置记录了快速眼动（REM睡眠）的发作。他们不超过2分钟。当鹿处于胸骨的姿势时，他们大部分时间都睁开眼睛：平均有96％的时间在Sambars中，而Sika Deer的82％。在这种姿势中，睁大眼睛的发作持续到8.4分钟，在Sika Deer中持续到3.3分钟。在横向位置，此类发作短4和1.5倍。睁开眼睛睡觉可能是保持警惕的重要机制。
Lyamin; O. I.[1];Siegel; J. M.[2];Nazarenko; E. A.[1];Vu; Manh[3];Rozhnov; V. V.[1]. Sleep with Open Eyes in Two Species of Deer, the Indian Sambar (Rusa unicolor) and Sika Deer (Cervus nippon)[J]. Doklady Biological Sciences, 2023,512(1): 295-299