Capture mechanisms used by the lobate ctenophore, Mnemiopsis leidyi, preying on the copepod Acartia tonsa
Capture mechanisms used by the lobate ctenophore, Mnemiopsis leidyi, preying on the copepod Acartia tonsa
复制标题
叶状栉水母 (Mnemiopsis leidyi) 捕食桡足类 Acaria tonsa 时使用的捕获机制
DOI：
10.1093/plankt/21.11.2037
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发表时间：
1999
影响因子：
2.1
通讯作者：
J. Costello
中科院分区：
文献类型：
--
作者：
R. Waggett;J. Costello
虽然叶状栉水母Mnemiopsis leidyi是一种有影响力的捕食性天敌，但使其能够捕获其特征性的广泛猎物的机制尚未得到系统的研究。我们记录了自由游泳M.leidyi和两个阶段（无节幼体，成人）的哲水蚤桡足类Acartia tonsa之间的相互作用，以确定这种喂养过程的机械解释。猎物与拟记忆体的相遇涉及两个不同的过程。第一种依赖于四个耳廓上纤毛几乎连续跳动所产生的流体运动。这些纤毛产生了一个低速流动，其中A.tonsa无节幼体被夹带（94%的无节幼体遭遇），并通过口叶运输到卷须（口触角）上。无节幼体，虽然能够快速逃避反应，一般似乎是不敏感的电流中，他们进行。第二个过程依赖于游动的猎物与口叶内表面的碰撞，而不受耳状摄食电流的明显影响。成年的扁桃体下棘球蚴很少被耳流夹带，而是推动自己与口叶接触（97%的成年人遇到）。这两种捕食过程的功能是相同的。这些过程的协同作用可能解释了广泛的模式，猎物的摄食在原位研究Mnemiopsis喂养。
Although the lobate ctenophore Mnemiopsis leidyi is an influential planktonic predator, the mechanisms enabling it to capture its characteristically wide range of prey have not been systematic- ally examined. We recorded interactions between free-swimming M.leidyi and two stages (nauplii, adults) of the calanoid copepod Acartia tonsa in order to determine a mechanistic explanation of this feeding process. Prey encounter with Mnemiopsis involved two different processes. The first depended on fluid motions created by the nearly continuous beating of cilia lining the four auricles. These cilia created a low-velocity flow in which A.tonsa nauplii were entrained (94% of naupliar encounters) and transported past the oral lobes onto the tentillae (oral tentacles). The nauplii, although capable of rapid escape responses, generally appeared to be insensitive to the current in which they were carried. The second process relied upon the collision of swimming prey with the inner surfaces of the oral lobes and was not obviously influenced by the auricular feeding currents. Adult A.tonsa were rarely entrained in the auricular flow, but, instead, propelled themselves into contact with the oral lobes (97% of adult encounters). Both prey capture processes functioned simul- taneously. The synergistic functioning of these processes probably explains the broad patterns of prey ingestion found by in situ studies of Mnemiopsis feeding.