Can the mechanoreceptional setae of a feeding‐current feeding copepod detect hydrodynamic disturbance induced by entrained free‐floating prey?

Can the mechanoreceptional setae of a feeding‐current feeding copepod detect hydrodynamic disturbance induced by entrained free‐floating prey?
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正在进食的桡足类的机械感受刚毛能否检测到由夹带的自由漂浮猎物引起的水动力干扰?

DOI:
10.1002/lno.11945
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发表时间:
2021
影响因子:
4.5
通讯作者:
Fu, Henry C.
Fu, Henry C.
中科院分区:
地球科学1区
文献类型:
--
作者:
Shen, Xinhui;Yao, Xin;Marcos;Fu, Henry C.

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桡足类动物利用进食电流击打它们的头状附属物来产生水流夹带,并通过触角和其他附属物上的机械感觉刚毛来探测附近猎物的存在。目前尚不清楚桡足类动物是否可以利用进食电流来感知周围环境的信息,当电流受到附近粒子的干扰时。在本文中,我们提出了一个数值模型来解决自由漂浮猎物的存在对摄食电流速度场的影响,以及这些猎物引起的干扰如何改变集合变形模式。我们规定了捕食附属物的跳动行程,并量化了由于猎物夹带而导致的横贯刚毛弯曲流和刚毛变形的变化。我们发现,首先,由于输入电流的时间平均速度分量,当过滤掉振荡分量时,数据集弯曲更大。其次,100μm直径的自由漂浮猎物不会引起近端和远端刚毛变形的任何明显变化,除非它们分别小于10或5.5个猎物半径。体型较大的猎物比体型较小的猎物造成更大的水流干扰,而体型较小的猎物更难被发现。最后,如果刚毛在没有猎物的情况下对相对变形的变化做出反应,那么远端刚毛可能具有远程敏感性,以帮助探测近端刚毛附近的猎物,但如果刚毛对变形的绝对变化做出反应,那么这两种刚毛都具有非常短的远程敏感性。
Copepods that catch prey using feeding currents beat their cephalic appendages to generate flow entrainment, and detect the presence of nearby prey through the mechanoreceptional setae on the antennules and other appendages. It remains unclear whether the feeding current can be used by the copepod to gain information about its surroundings by sensing when the current is disturbed by nearby particles. In this article, we present a numerical model to address how much the presence of free‐floating prey can alter the feeding current velocity field, and how these prey‐induced disturbances modify setal deformation patterns. We prescribe the beating strokes of the feeding appendages, and quantify the changes in the bending flows across the setae and setal deformations due to the prey entrainment. We find that, first, the seta bends more due to the time‐averaged velocity component of the feeding current, while filtering out the oscillatory component. Second, 100μm diameter free‐floating prey do not induce any noticeable change in deformations of the proximal and distal setae unless they are less than 10 or 5.5 prey radii from the antennules, respectively. Larger prey cause bigger flow disturbances than small prey, which are expected to be even harder to detect. Last, if setae are responsive to changes in deformationrelativeto the deformations in the absence of prey, the distal seta may have long‐ranged sensitivity to assist in detection of prey near the proximal seta, but if setae are responsive toabsolutechanges in deformation, both setae have very short‐ranged sensitivity.
DOI: --
发表时间: 2006
期刊:
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