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首页> 外文期刊>Marine biology >Juvenile-adult relationship in the gregarious ophiuroid Ophiothrix fragilis (Echinodermata): a behavioral and morphological study
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Juvenile-adult relationship in the gregarious ophiuroid Ophiothrix fragilis (Echinodermata): a behavioral and morphological study

机译：蛇形脆弱类蛇眼（Echinodermata）少年与成人的关系：行为和形态学研究

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Ophiothrix fragilis forms dense beds in the North Sea-English Channel region, where juveniles are exclusively found on adults. The aim of this study was to see how the behavior and morphology of juveniles could help elucidate the close juvenile-adult relationship found in this species. Juveniles are found on the disk, arms and in the bursae of adult conspecifics, the ones on the disks being significantly larger. No clear advantage seems to be gained by the juveniles being in the bursae, and their presence there is most likely due to juvenile movement on adults and to and from adults. Hooked spines serve as anchory organs during the early life of the juvenile, but growth of the arms enhances its anchory capabilities and the hooked spines become secondary in that respect. They regress as ophiuroids become older, to the advantage of the other spines used in suspension feeding. Juveniles are attracted to conspecifics, and true gregarious behavior has been observed. The tip of each arm, the terminal tentacle, plays a major role in distance chemoattraction, with juveniles needing at least one intact terminal tentacle to be able to initiate a response. Electron microscope observations of the terminal tentacle permitted us to recognize two different potential receptor structures designated stabchens. The first possesses one long projecting cilia and is mostly present around the base of the terminal tentacle, while the other has one to five short projecting cilia and is mostly found on the tip. No receptors are found on the shaft. Receptors are not associated with secretory structures. Juveniles and adults are closely associated with one another, and both the morphology and behavior of juveniles play an important role in that relationship.
机译：脆弱的蛇形纲在北海-英吉利海峡地区形成密集的河床，那里仅在成年人中发现幼鱼。这项研究的目的是了解少年的行为和形态如何帮助阐明该物种中少年与成年人之间的亲密关系。在成年种的圆盘，臂和法氏囊中发现了幼鱼，圆盘上的幼鱼明显更大。少年在法氏囊中似乎并没有获得明显的优势，而且它们的存在很可能是由于少年在成年人之间以及在成年人与成年人之间来回运动的缘故。钩状棘刺在少年的早期生活中起着锚定器官的作用，但是手臂的生长增强了它的锚定能力，钩状棘刺在这方面成为次要的。它们随着蛇形类的变老而消退，这有利于悬浮饲料中使用的其他棘突。少年被特定物种吸引，并且观察到了真正的合群行为。每条臂的尖端，即触手，在距离化学引诱中起主要作用，而幼虫需要至少一个完整的触手才能发起反应。电子显微镜观察到的触手末端使我们能够识别出两种被称为结刺的潜在受体结构。第一个具有一个长的伸出的纤毛，并且大部分存在于触手的根部周围，而另一个则具有一到五个短的伸出的纤毛，并且大多位于尖端。在轴上未发现接收器。受体与分泌结构无关。少年和成年人彼此密切相关，少年的形态和行为在这种关系中都起着重要的作用。

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