The eyestalk photophore of Northern krill Meganyctiphanes norvegica (M. Sars) (Euphausiacea) re-investigated: Innervation by specialized ommatidia of the compound eye

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2024-10-18 DOI:10.1016/j.asd.2024.101393
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Abstract

Members of the Euphausiacea (“krill”) generate bioluminescence using light organs, the so-called photophores, including one pair associated with the eyestalks, two pairs on the thoracic segments, and four unpaired photophores on the pleon. The photophores generate light via a luciferin–luciferase type of biochemical reaction in light-emitting cells comprised in a photophore compartment called “lantern”. The behavioral significance of bioluminescence in krill is discussed controversially, and possible functions include a defensive function, camouflage by counter-shading, and intra-specific communication. Light production of all krill photophores is controlled by hormonal and neuronal pathways but our knowledge about the nature of these pathways is still rudimentary. Here, we provide a detailed description of the eyestalk photophore's histology in Northern krill Meganyctiphanes norvegica, and used immunohistochemistry combined with confocal laser-scan microscopy to explore this organ's serotonergic innervation. Furthermore, we provide evidence that the photophore is innervated by a distinct photophore nerve that originates from a specialized cluster of ca. 30 highly modified ommatidia at the dorsal rim of the compound eye that are optically isolated from the other ommatidia. Our findings suggest the compound eye – photophore link as a major anatomical axis to adjust the photophore activity.
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对北方磷虾(大戟纲)Meganyctiphanes norvegica (M. Sars)的眼柄光器进行再研究:复眼特化膜的神经支配。
磷虾类(Euphausiacea)的成员利用光器官(即所谓的光孔)产生生物发光,包括一对与眼柄相关的光孔、两对位于胸节上的光孔以及四个位于褶上的非配对光孔。这些光器通过发光细胞中的荧光素-荧光素酶类型的生化反应产生光,这些细胞组成的光器区被称为 "灯笼"。磷虾生物发光的行为意义尚存争议,可能的功能包括防御功能、通过反遮光进行伪装以及特异性内部交流。磷虾所有光生器的产光都受激素和神经通路的控制,但我们对这些通路的性质还知之甚少。在这里,我们详细描述了北磷虾(Meganyctiphanes norvegica)眼茎光团的组织学结构,并利用免疫组化结合激光共聚焦扫描显微镜来探索该器官的血清素能神经支配。此外,我们还提供了证据,证明复眼由一种独特的复眼神经支配,该神经源于复眼背侧边缘约 30 个高度改良的膜簇,这些膜簇在光学上与其他膜簇隔离。我们的研究结果表明,复眼与光团之间的联系是调节光团活动的主要解剖轴。
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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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Cuticle ultrastructure of the Early Devonian trigonotarbid arachnid Palaeocharinus Evolution of and structures involved in wing folding in featherwing beetles (Coleoptera: Ptiliidae) Morphology of lecithotrophic postlarvae of genus Austropallene (Arthropoda: Chelicerata) with some notes on reproductive strategy The eyestalk photophore of Northern krill Meganyctiphanes norvegica (M. Sars) (Euphausiacea) re-investigated: Innervation by specialized ommatidia of the compound eye Outside Front Cover
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