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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Morphology and control of photogenic structures in a rare dwarf pelagic lantern shark (Etmopterus splendidus)
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Morphology and control of photogenic structures in a rare dwarf pelagic lantern shark (Etmopterus splendidus)

机译：罕见的侏儒中上层彩翅鲨（Etmopterus splendidus）的形态和光致结构的控制

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摘要

The shark genus Etmopterus encompasses numerous deep-sea species that are widely distributed throughout the world's oceans and share the capability to emit light thanks to numerous tiny epidermal photogenic organs called photophores. Despite the potential wide ecological interest of this light emission, it is still a poorly studied aspect of shark biology, mostly due to the challenges inherent to the study of uncommon deep-sea animals. During a collection trip in waters around Okinawa Island, we had the opportunity to collect, maintain and study specimens of Etmopterus splendidus, a small pelagic lantern shark that was not previously known from this area. Analyses show that (ⅰ) the photophore density of this species varies according to the different parts of the body, which led to a heterogeneous photogenic pattern; (ⅱ) photophore harbour the classical structure found in other etmopterid sharks, i.e. a cluster of photocytes enclosed in a pigmented sheath and surmounted by pigmented and lens cells; (ⅲ) the physiological control of these photophores appears similar to what was found in the distantly related Etmopterus spinax, i.e. including hormonal and neural inputs as well as the action of pigmented cells overlying the photocytes. These results indicate that E. splendidus luminescence is probably used for more than one purpose, and support the idea that the physiological control of lantern shark photophores was selected early in the evolution of these sharks.
机译：鲨科属的鳞翅目（Etmopterus）包含无数深海物种，这些物种广泛分布于世界各地的海洋中，并且由于无数种微小的表皮光生器官（称为荧光团）而具有发光能力。尽管这种发光具有潜在的广泛的生态学意义，但它仍然是鲨鱼生物学研究的一个较差的方面，这主要是由于研究罕见的深海动物所固有的挑战。在冲绳岛附近水域的一次收集旅行中，我们有机会收集，维护和研究了Etmopterus splendidus的标本，Etmopterus splendidus是一种小上层灯笼鲨，以前在该地区尚不知道。分析表明（ⅰ），该物种的荧光体密度根据身体的不同部位而变化，从而导致了异质性的光生性模式； （ⅱ）荧光团具有其他翅翅目鲨中发现的经典结构，即一簇光细胞包围在有色鞘中，并被有色和晶状体细胞覆盖； （ⅲ）这些荧光体的生理控制似乎与在远缘的线翅目纺锤体中发现的相似，即包括激素和神经输入以及色素细胞在光细胞上的作用。这些结果表明，锦绣肠发光可能用于多种目的，并支持这样的想法，即在这些鲨鱼的进化的早期就选择了灯笼鲨荧光体的生理控制。

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