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首页> 外文期刊>ICES Journal of Marine Science >Feeding ecology of early life stages of mesopelagic fishes in the equatorial and tropical Atlantic
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Feeding ecology of early life stages of mesopelagic fishes in the equatorial and tropical Atlantic

机译：赤道和热带大西洋中生鱼类早期生命的摄食生态

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摘要

We analysed the trophic ecology of the early ontogenetic stages of six mesopelagic fish species (Bathylagoides argyrogaster, Argyropelecus sladeni, Sternoptyx diaphana, Diaphus vanhoeffeni, Hygophum macrochir, and Myctophum affine), which have different morphologies, vertical distributions, and taxonomic affiliations. The larvae and transforming stages of the sternoptychids fed both during the day and at night. However, larvae of the other species fed during the day, as they apparently rely on light for prey capture. The transforming stages of myctophids showed a similar daylight feeding pattern to their larvae, but in D. vanhoeffeni both day and night feeding was evident, thereby indicating the progressive change toward the adult nocturnal feeding pattern. The number of prey and their maximum sizes were linked to predator gut morphology and gape size. Although the maximum prey size increased with predator development, postflexion larvae and transforming stages also preyed on small items, so that the trophic niche breath did not show evidence of specialization. In all the species, copepods dominated the larval diet, but the transforming stages were characterized by increasing diet diversity. Despite the poor development of these early stages, Chesson's selectivity index calculated for larvae and transforming stages showed positive selection for particular prey.
机译：我们分析了六种中古鱼类（Bathylagoides argyrogaster，Argyropelecus sladeni，Sternoptyx diaphana，Diaphus vanhoeffeni，Hygophum macrochir和Myctophum affine）的个体发育早期的营养生态学，它们具有不同的形态，垂直分布和分类学。白天和晚上喂食的类的幼虫和蜕变阶段。但是，白天其他种类的幼虫会喂食，因为它们显然依靠光捕获猎物。菌丝体的转化阶段显示出与其幼虫相似的日光进食模式，但是在南美白对虾中白天和晚上的进食都很明显，从而表明其向成年夜进食模式的逐步改变。猎物的数量及其最大大小与捕食者肠道的形态和裂口的大小有关。尽管最大猎物的大小随着捕食者的发展而增加，但屈曲后的幼虫和蜕变阶段也捕食小型物品，因此营养小生境的呼吸并没有显示出专门化的迹象。在所有物种中，co足类在幼虫饮食中占主导地位，但转变阶段的特征是饮食多样性增加。尽管这些早期阶段发展不佳，但针对幼虫和转化阶段计算出的Chesson选择性指数显示出对特定猎物的积极选择。

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