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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52006

Title: Summer profundal hypoxia determines the coupling of methanotrophic production and the pelagic food web in a subtropical reservoir
Authors: Pei‐Chi Ho
Noboru Okuda
Takeshi Miki
Masayuki Itoh
Fuh‐Kwo Shiah
Chun‐Wei Chang
Silver Sung‐Yun Hsiao
Shuh‐Ji Kao
Megumu Fujibayashi
Chih‐Hao Hsieh
Contributors: 國立臺灣海洋大學:海洋環境與生態研究所
Keywords: methanotrophic food web
profundal hypoxia
stratification
water column disturbance
winter mixing
Date: 2016
Issue Date: 2019-01-11T03:31:07Z
Publisher: Freshwater Biology
Abstract: Abstract: We investigated how profundal redox conditions determine the inter‐annual variation in methane oxidising bacteria (MOB) contribution to zooplankton production in a deep subtropical reservoir. Two hydrological regimes which affect MOB activity are considered: (i) reduced MOB activity resulting from high profundal oxygen saturation promoted by water column disturbance during the period of summer stratification; and (ii) increased MOB activity due to high profundal oxygen saturation during winter mixing.
Four years of field stable‐isotope analyses revealed that oxygen saturation of profundal waters during summer stratification was negatively correlated with winter MOB contribution. This relationship is consistent with our theoretical ecosystem modelling.
Although the ecosystem model simulation predicted positive effects of profundal oxygen supply during winter mixing on MOB contribution, the stable isotope mixing model indicated that the effects were secondary. Winter oxygen supply did not enhance MOB activity when methane accumulation during the preceding summer was low.
Our findings suggest that summer profundal hypoxia plays the primary role in determining methanotrophic food‐web activity and methane‐derived carbon cycling in deep lakes.
Relation: 61(10) pp.1694-1706
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52006
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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