Downstream drifting of Macrobrachium (Decapoda: Palaemonidae) larvae in the Shimanto River, Japan

IF 0.6 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY

Plankton & Benthos Research Pub Date : 2021-11-17 DOI:10.3800/pbr.16.301

Hiroyuki Hiraga, K. Azuma, T. Kusaka, I. Kinoshita, S. Fujita

引用次数: 1

Abstract

: This study was undertaken to clarify the downstream drifting of Macrobrachium larvae in the Shimanto River by 24-hour sampling. Stage I zoeae accounted for most larvae collected in fresh and brackish waters. M. formosense and M. japonicum dominated in brackish and fresh waters, respectively, while M. nipponense occurred only in brackish waters. The amount of yolk droplets of M. formosense and M. japonicum reduced over time in freshwater. However, no larvae that had completely used up their yolks were observed. Even though M. japonicum larvae drifted from farther upstream than those of M. formosense , they had a higher residual amount of yolk droplets. Therefore, long-distance and long-time drifting in M. japonicum may be enabled by delaying the absorption rate of droplets.

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日本岛曼托河大臂虾(十足目:长臂虾科)幼虫的下游漂流

采用24小时采样的方法，对石曼托河中沼虾幼体的下游漂流情况进行了研究。在淡水和半咸淡水中收集到的幼虫中，I期珊瑚虫占大多数。台湾稻虱和日本稻虱分别在咸淡水和淡水中占优势，日本稻虱仅在咸淡水中发生。在淡水中，台湾血吸虫和日本血吸虫卵黄滴的数量随着时间的推移而减少。然而，没有观察到完全耗尽蛋黄的幼虫。尽管日本血吸虫的幼虫比台湾血吸虫的幼虫上游游得更远，但它们的卵黄液滴残留量更高。因此，延缓液滴的吸收率可能有助于日本血吸虫的长距离和长时间漂移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plankton & Benthos Research Agricultural and Biological Sciences-Aquatic Science

CiteScore

1.30

自引率

0.00%

发文量

期刊介绍： Plankton and Benthos Research is a peer-reviewed journal publishing quarterly original papers, reviews and notes dealing with any aspect of the biology and ecology of planktonic and benthic organisms and their interactions with the environment in any aquatic system, and is open to all scientists around the world. Submission of a paper is held to imply that it represents an original contribution not previously published and that it is not being considered elsewhere.