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首页> 外文期刊>Marine biology >Movement patterns of the limpet Cellana grata (Gould) observed over a continuous period through a changing tidal regime
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Movement patterns of the limpet Cellana grata (Gould) observed over a continuous period through a changing tidal regime

机译：在不断变化的潮汐状态下连续观察到的帽贝Cellana grata（Gould）的运动方式

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摘要

Time-lapse videography of limpets mounted with light-emitting diodes was used to monitor the movements of a population of the non-homing Cellana grata on a vertical gully wall in Hong Kong. Animals were monitored for > 7 days to examine spatial and temporal variation in their behaviour as the tides transited from a semi-diurnal to an almost diurnal pattern. Movement was synchronised with the tides, irrespective of the day-night cycles. Limpets rested low on the shore and were stimulated to move by the rising tide. Individuals moved up shore with the flooding tide, maintaining themselves in the awash zone, and then down shore on the ebbing tide, until they reached a resting height when the tide then fell beneath them, exhibiting 'zonal shuttling'. A tight coupling of limpet position to tide height persisted through the changing tidal pattern, and almost all animals displayed the same organisation of activity over all tides. Initiation of activity and maximum height reached were probably controlled by the tides, but the cessation of activity may have been controlled by an internal clock. The pattern observed is consistent with the threat of attack from aquatic predators coupled with the need to minimise physical stresses while exposed. It is also consistent with the avoidance of grazing lower on the shore where interspecific competition may be more intense. Limpets showed two peaks of activity per tide, corresponding to when the rate of change of tide height was the greatest, except when tides became much reduced during the transit to a diurnal pattern. Movement was triphasic: an initial rapid phase, followed by a slower phase in the high shore and then a rapid phase before the limpets stopped moving. This structure is common in limpets and in this case is likely to be a consequence of animals maintaining themselves within the awash zone. Tide height appears to determine foraging activity, but with modifications in the behaviour in response to factors operating at more local temporal and spatial scales.
机译：装有发光二极管的帽贝的延时摄影用于监视香港垂直沟壑上非归巢的Cellana grata种群的运动。监测动物> 7天，以检查潮汐从半日模式转变为近日模式时行为的时空变化。无论昼夜周期如何，运动都与潮汐同步。残肢在岸上休息得很低，并受到涨潮的刺激而移动。个体随着洪水泛滥而上岸，将自己保持在淹没区，然后沿着退潮顺流而下，直到潮汐跌落到其下方时达到静止高度，表现出“纬向穿梭”。在不断变化的潮汐模式中，帽贝位置与潮汐高度紧密结合，几乎所有动物在所有潮汐中都表现出相同的活动组织。活动的开始和到达的最大高度可能受到潮汐的控制，但活动的停止可能已由内部时钟控制。观察到的模式与水生捕食者攻击的威胁以及暴露时最小化物理压力的需求是一致的。这也与避免在种间竞争可能更加激烈的海岸上放牧越低相符。潮羽显示每个潮汐有两个活动高峰，这与潮汐高度变化率最大时相对应，除了在转变为昼夜模式时潮汐大大减少时。运动是三阶段的：最初是快速阶段，随后是高岸的较慢阶段，然后是快速阶段，直到帽贝停止移动。这种结构在帽贝中很常见，在这种情况下，很可能是动物将自己保持在冲洗区内的结果。潮高似乎决定了觅食活动，但随着行为在局部时空尺度上的变化，行为发生了改变。

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