What is the relationship between hypoxia, water chemistry and otolith manganese content?

Shengjiang Jiang, Peiqi Hong, Satoshi Katayama

研究成果: Review article査読

抄録

Previous studies have shown an increase in otolith Mn caused by exposure to hypoxic water masses. The mechanism leading to the increases in otolith Mn is still unclear, but might possibly be due to the larger amount of available Mn left in the water column under hypoxia. Thus, this study aimed to examine the relationship between hypoxia, water Mn and otolith Mn through marbled flounder (Pseudopleuronectes yokohamae, Günther) captured from Tokyo Bay and reared under different water Mn at laboratory. Otoliths from the Bay showed a higher (Mn/Ca)otolith than outside, together with a seasonal trend of high (Mn/Ca)otolith at the start of translucent zones (which form in the summer), supporting the occurrence of summer hypoxia in Tokyo Bay. Nonetheless, juveniles reared under control (Mn 0.50 μmol l−1), middle (Mn 6.94 μmol l−1) and high (Mn 10.4 μmol l−1) treatments of water Mn concentrations showed a disproportional smaller increase in (Mn/Ca)otolith. Comparing the laboratory experiment with the field data, (Mn/Ca)water under hypoxia in Tokyo Bay could reach a low level similar to control treatment, yet (Mn/Ca)otolith of the Bay showed a higher value than the high treatment. These results revealed an elevated (Mn/Ca)otolith towards hypoxia, but also suggested that changes in water Mn might not be directly recorded by otolith Mn.

本文言語English
ページ(範囲)1138-1149
ページ数12
ジャーナルJournal of Fish Biology
100
5
DOI
出版ステータスPublished - 2022 5月

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 水圏科学

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