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首页> 外文期刊>Polar biology >Olfaction in the Antarctic toothfish Dissostichus mawsoni: clues from the morphology and histology of the olfactory rosette and bulb
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Olfaction in the Antarctic toothfish Dissostichus mawsoni: clues from the morphology and histology of the olfactory rosette and bulb

机译：南极牙鱼Dissostichus mawsoni的嗅觉：嗅觉莲座丛和鳞茎的形态和组织学线索

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摘要

The Antarctic notothenioid fish Dissostichus mawsoni (Antarctic toothfish) is an important piscine top predator in the Southern Ocean. Good olfactory capability has been hypothesized for this species on the basis of morphological (size of its olfactory bulb compared to other notothenioids) and behavioral (long distance migrations for food search and reproduction) traits. Here, we provide new information on the structure and function of the olfactory rosette and bulb of D. mawsoni using histology. Adult specimens (total length 136.2 +/- 11.6 cm) were collected from McMurdo Sound. The rosettes had an average of 39 lamellae, without secondary folds and with a total surface area of about 1000 mm(2). Both putative ciliated and microvillous receptor neurons were present in the sensory epithelium. Their projections to clustered glomeruli in the olfactory bulb were observed using antibodies against G-proteins. Numerous rodlet cells were observed in the epithelium and Gi2-like immunoreactivity was present in their cytoplasm. This deserves further investigation given the still-debated nature of this cell type. Through the isotropic fractionator method, we showed 116,000 cells (mg of tissue)(-1) in the olfactory bulb of D. mawsoni, a density that is similar to those found in mammals. Taken together, these data describe a well-developed olfactory system in this species, where olfaction is key sensory system.
机译：南极类胡萝卜素鱼Dissostichus mawsoni（南极牙鱼）是南部海洋中重要的鱼类捕食者。根据形态（其嗅球大小与其他类胡萝卜素相比，其嗅球大小）和行为（用于食物搜索和繁殖的长距离迁徙）特征，对该物种具有良好的嗅觉能力进行了假设。在这里，我们使用组织学方法提供关于毛白僵菌嗅花环和球茎的结构和功能的新信息。从McMurdo Sound收集成年标本（总长136.2 +/- 11.6 cm）。莲座丛平均有39个薄片，没有次级褶皱，总表面积约为1000毫米（2）。感觉上皮细胞中存在既定的纤毛和微绒毛受体神经元。使用针对G蛋白的抗体，可以观察到它们在嗅球中聚集在肾小球上。在上皮细胞中观察到许多小细胞，其细胞质中存在类似Gi2的免疫反应性。考虑到这种细胞类型仍然存在争议，这值得进一步研究。通过各向同性分馏器方法，我们在毛毛线虫的嗅球中显示了116,000个细胞（mg组织）（-1），其密度与哺乳动物中的密度相似。综上所述，这些数据描述了该物种中发达的嗅觉系统，其中嗅觉是关键的感觉系统。

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