普通鱼中鱼(Porichthysnotatus)的听觉系统是一种重要的感觉系统,用于检测和编码对生存和繁殖至关重要的生物相关声学刺激,包括用于种内交流的社会声学信号。先前的工作表明,在女性和I型男性中,中青年囊中的毛细胞(HC)密度随生殖状态的季节性增加而增加,并且同时增强了听觉囊敏感性。尽管在成年中士囊中已很好地表征了HC密度的生殖状态依赖性变化,关于个体发育过程中囊是如何变化的,人们知之甚少。这里,我们检查了四个相对大小的midshipman(幼虫,小少年,大型青少年,和非生殖成年人)来确定密度,总数,囊状HCs的取向模式在个体发育过程中发生变化。此外,我们还检查了非生殖成年人的囊袋中的HCs总数是否不同于囊和lagena。我们发现HC密度随发育阶段而变化。HC密度的个体发育减少与黄斑面积的个体发育增加同时发生。囊状HC的取向模式类似于先前在其他硬骨鱼中描述的标准模式,并且在个体发育过程中保留了HC取向的这种模式。最后,从最小的幼虫(2,336HCs)到最大的非生殖成虫(145,717HCs),在非生殖成年人中,估计HC数量在囊中最高(平均值±SD=28,479±4,809HC),居于中部(平均值±SD=11,008±1,619HCs),最低的是lagena(平均值±SD=4,560±769HCs)。
The auditory system of the plainfin midshipman fish (Porichthys notatus) is an important sensory system used to detect and encode biologically relevant acoustic stimuli important for survival and reproduction including social acoustic signals used for intraspecific communication. Previous work showed that hair cell (HC) density in the midshipman saccule increased seasonally with reproductive state and was concurrent with enhanced auditory saccular sensitivity in both females and type I males. Although reproductive state-dependent changes in HC density have been well characterized in the adult midshipman saccule, less is known about how the saccule changes during ontogeny. Here, we examined the ontogenetic development of the saccule in four relative sizes of midshipman (larvae, small juveniles, large juveniles, and nonreproductive adults) to determine whether the density, total number, and orientation patterns of saccular HCs change during ontogeny. In addition, we also examined whether the total number of HCs in the saccule differ from that of the utricle and
lagena in nonreproductive adults. We found that HC density varied across developmental stage. The ontogenetic reduction in HC density was concurrent with an ontogenetic increase in macula area. The orientation pattern of saccular HCs was similar to the standard pattern previously described in other teleost fishes, and this pattern of HC orientation was retained during ontogeny. Lastly, the estimated number of saccular HCs increased with developmental stage from the smallest larvae (2,336 HCs) to the largest nonreproductive adult (145,717 HCs), and in nonreproductive adults estimated HC numbers were highest in the saccule (mean ± SD = 28,479 ± 4,809 HCs), intermediate in the utricle (mean ± SD = 11,008 ± 1,619 HCs) and lowest in the
lagena (mean ± SD = 4,560 ± 769 HCs).