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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51099

Title: Integrating isotopic, microbial, and modeling approaches to understand methane dynamics in a frequently disturbed deep reservoir in Taiwan
Authors: Masayuki Itoh
Hisaya Kolima
Pei-Chi Ho Chun-Wei Chang
Tzong-Yueh Chen
Silver Sung-Yun Hsiao
Yuki Kobayashi
Megumi Fujibayashi
Shuh-Ji Kao
Chih-hao Hsieh
Manabu Fukui
Noboru Okuda
Takeshi Miki
Fuh-Kwo Shiah
Contributors: 國立臺灣海洋大學:海洋環境與生態研究所
Keywords: Methane production
Methane oxidizing bacteria
Food web model
Isotope ecology Environmental microbiology
Date: 2017-11
Issue Date: 2018-11-12T06:04:55Z
Publisher: Ecological Research
Abstract: Abstract: It has been estimated that more than 48% of global methane emissions from lakes and reservoirs occur at low latitudes (<24°). To improve this estimate, knowledge regarding underexplored ecosystems, particularly deep lakes and reservoirs in Asian monsoon regions, is needed because the magnitude of methane emissions is influenced by lake bathymetry and climatic conditions. We conducted long-term studies beginning in 2004 at Feitsui Reservoir (FTR) in Taiwan, a subtropical monomictic system with a maximum depth of 120 m to monitor seasonal and interannual variations of three key characteristics and to understand the mechanisms underlying these variations. Key characteristics investigated were as follows: (1) the balance of primary production and heterotrophic respiration as a determinant of vertical oxygen distribution, (2) methane production at the bottom of the reservoir, oxidation in the water column, and emissions from the lake surface, and (3) the contribution of methane-originated carbon to the pelagic food web through methane-oxidizing bacteria (MOB). This review highlights major achievements from FTR studies integrating isotopic, microbial, and modeling approaches. Based on our findings, we proposed two conceptual models: (1) a model of methane dynamics, which addresses the differences in methane emission mechanisms between deep and shallow lakes, and (2) a spatially explicit model linking benthic methane production to the pelagic food web, which addresses the diversity of MOB metabolisms and their dependence on oxygen availability. Finally, we address why long-term studies of subtropical lakes and reservoirs are important for better understanding the effects of climate on low- to mid-latitude ecosystems.
Relation: 32(6) pp.861-871
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51099
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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