Feeding and growth efficiency in a pelagic chaetognath, Zonosagitta nagae reared in the laboratory
Feeding and growth efficiency in a pelagic chaetognath, Zonosagitta nagae reared in the laboratory
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实验室饲养的中上层毛颌动物 Zonosagitta nagae 的摄食和生长效率
DOI：
10.1093/plankt/fbaa014
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发表时间：
2020
影响因子：
2.1
通讯作者：
Takahashi Kazutaka
中科院分区：
文献类型：
--
作者：
Otake Shiori;Shimode Shinji;Takahashi Kazutaka
毛颚类在海洋环境中普遍存在，是最丰富的食肉浮游生物之一。然而，生理参数的表征仍然有限，主要是由于在实验室研究中获得的数据从远洋毛颚类的困难。因此，本研究的目的是确定在实验室饲养条件下的长带赶虫的摄食率和生长率。在6月、8月和10月采集的总共54条野外采集的毛颚类，其成熟期I和II，体长范围为5至12 mm，在20-22°C下与过量的桡足类猎物单独孵育，并从存活约10-46天的26个个体获得生长参数。对于Z。nagae、摄食率和生长率随体干重的增加而增加，并且这两个参数显著相关，表明毛生长效率约为47%。比摄食率范围为0.03 ~ 0.43 d-1，且随毛颚类体型的增大而减小。个体特定生长率在小个体（~6 mm）中变化很大，范围为-0.103至0.135，但随着个体大小的增加而变得相对恒定（~0.032）。总的来说，研究结果表明Z.长叶藻具有高生长效率的特点，这与以前研究的近岸物种形成鲜明对比。
Chaetognaths are ubiquitous in the marine environment and are among the most abundant carnivorous plankton. Nevertheless, characterization of physiological parameters remains limited largely due to the difficulty in obtaining the data from pelagic chaetognaths in laboratory studies. This study therefore aimed to determine the feeding and growth rates ofZonosagitta nagaeunder laboratory rearing condition. A total of 54 field-collected chaetognaths with maturity Stage I and II ranging from 5 to 12 mm in body length collected in June, August and October were individually incubated at 20–22°C with excess copepod prey and growth parameters were obtained from 26 individuals that survived ~10–46 days. ForZ. nagae, ingestion and growth rates increased with body dry weight, and both parameters were significantly related, indicating that gross growth efficiency was ~47%. Specific ingestion rates ranged from 0.03 to 0.43 d−1and tended to decrease with an increase of size of the chaetognaths. Individual specific growth rate varied widely in small-sized individuals (~6 mm), ranging from −0.103 to 0.135, but became relatively constant (~0.032) with increasing size. Overall the study results suggest thatZ. nagaeis characterized by high gross growth efficiency, which is in striking contrast with previously studied inshore species.
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