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Ventilatory and behavioural responses of the marbled sole Pseudopleuronectes yokohamae to progressive hypoxia
Author(s) -
Nishizawa H.,
Kono Y.,
Arai N.,
Shoji J.,
Mitamura H.
Publication year - 2017
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13319
Subject(s) - biology , hypoxia (environmental) , hypoxic ventilatory response , ventilation (architecture) , oxygen , respiratory system , zoology , medicine , anatomy , chemistry , mechanical engineering , organic chemistry , engineering
This study identified ventilatory and behavioural responses in the marbled sole Pseudopleuronectes yokohamae under experimentally induced progressive decreases in dissolved oxygen ( DO ) levels. Ventilation frequency showed an increase with decreasing DO levels from normoxia to 2·75 mg O 2 l −1 , followed by a decrease in ventilation frequency at decreased DO levels from 2·00 to 0·75 mg O 2 l −1 . At DO levels below 2·00 mg l −1 , behaviours at the bottom were suppressed, whereas avoidance behaviours increased. A decrease in avoidance behaviours was observed from 1·00 to 0·75 mg O 2 l −1 . Upside‐down reversal and incapacitation at DO levels of 1·00–0·75 mg O 2 l −1 suggested that sublethal effects on P. yokohamae were induced. The responses observed before the sublethal DO level could be interpreted as an effort to maintain oxygen uptake, reduce routine activities and facilitate avoidance. The observed DO level thresholds that induce behavioural responses, in addition to sublethal effects, indicate hypoxia‐tolerance that is important for understanding the effects of hypoxia on coastal ecosystems.