Half-Blind to the Risk of Predation
Half-Blind to the Risk of Predation
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DOI：
10.3389/fevo.2017.00131
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发表时间：
2017-10-24
影响因子：
3
通讯作者：
Beauchamp, Guy
中科院分区：
文献类型：
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作者：
Beauchamp, Guy
眨眼在动物身上有几种功能，但它的代价是间歇性失明。眨眼可以自发发生，但它通常与头部运动有关。由于喂养动物经常需要反复低头以收集资源，间歇性失明可能是迄今为止未被重视的喂养成本。此外，这种成本在较大的群体中也可能更普遍，因为喂养努力通常随着群体大小而增加。在鸡（原鸡），眨眼与头部运动发生在一个高频率的喂养回合。虽然眨眼的时间往往很短，但在喂食时眨眼的时间接近50%，并且随着群体的大小而增加。相比之下，当鸟类在喂食之间简单地监测周围环境时，眨眼的时间要短得多。在这种规模的间歇性眨眼喂食时，可能会降低及时发现捕食威胁和有效监测邻居的能力。
Blinking serves several functions in animals, but it comes at the cost of intermittent blindness. Blinking can occur spontaneously, but it is commonly associated with head movements. As feeding animals often need to move the head down repeatedly to gather resources, intermittent blindness might represent a hitherto unappreciated cost of feeding. In addition, this cost might also be more prevalent in larger groups as feeding effort typically increases with group size. In chickens (Gallus gallus domesticus), blinks associated with head movements occurred at a high frequently during feeding bouts. While blinks tended to be short, the amount of time spent blinking was close to 50% when feeding and increased with group size. By contrast, time spent blinking was much lower when birds simply monitored their surroundings between feeding bouts. Intermittent blinking at this scale when feeding is likely to decrease the ability to detect predation threats in a timely fashion and to monitor neighbors effectively.