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首页> 外文期刊>Canadian Journal of Zoology >Correlation of depth and heart rate in harbour sealpups
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Correlation of depth and heart rate in harbour sealpups

机译：海豹幼崽的深度和心率的相关性

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摘要

Harbour seal (Phoca vitulina L., 1758) pups are aquatically active from birth and have been shown to develop increased cardiac control throughout the nursing period. In an attempt to quantify and compare these developmental changes, data previously collected on pups in the St. Lawrence River estuary, Quebec, Canada, were analyzed. Time-depth recorders and heart-rate recorders were employed on eight pups to obtain depth and heart-rate measurements simultaneously. Analyses involved partitioning the data into intervals of surface-dive-surface. These intervals were then allocated into nine consecutive segments: presurface, predive surface, descent, prebottom, bottom, postbottom, ascent, postdive surface, and postsurface. Mean heart rate for each segment was then correlated with the mean depth per segment and overall dive duration. With increasing dive depth, a decrease in heart-rate variability with age was observed. There was no apparent relationship between mean heart rate during the dive and overall dive duration. The proportion of time spent in the lower heart-rate mode was observed to increase with age during most phases of a dive. Relative changes in mean heart rate between consecutive dive segments indicated an initial decrease in mean heart rate prior to submersion and an increasing trend before surfacing. These findings indicate that harbour seal pups develop increased cardiac control prior to weaning and that anticipatory cardiac responses to diving and surfacing (bradycardia and tachycardia, respectively) may be evident.
机译：斑海豹（Phoca vitulina L.，1758）幼崽从出生开始就具有水生活性，并且在整个哺乳期间，它们都表现出增强的心脏控制能力。为了量化和比较这些发育变化，分析了以前在加拿大魁北克省圣劳伦斯河河口的幼崽收集的数据。在八个幼崽上使用了时间深度记录器和心率记录器，以同时获取深度和心率测量值。分析涉及将数据划分为表面潜水面的间隔。然后将这些间隔分配为九个连续的部分：前表面，前掠表面，下降，前底部，底部，后底部，上升，后俯表面和后表面。然后将每个节段的平均心率与每个节段的平均深度和整个潜水时间相关联。随着潜水深度的增加，观察到心率变异性随年龄下降。潜水期间的平均心率与整体潜水时间之间没有明显的关系。在大多数潜水阶段中，观察到在低心率模式下花费的时间比例会随着年龄的增长而增加。连续潜水段之间平均心率的相对变化表明，浸没前平均心率出现初始下降，而堆焊前平均心率出现上升趋势。这些发现表明，海豹幼崽在断奶前会增强心脏的控制能力，而且对潜水和浮出水面（分别为心动过缓和心动过速）的预期心脏反应可能很明显。

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