Direct Linkage between Dimethyl Sulfide Production and Microzooplankton Grazing, Resulting from Prey Composition Change under High Partial Pressure of Carbon Dioxide Conditions

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• 作者：Ki-Tae Park ; Kitack Lee ; Kyoungsoon Shin ; Eun Jin Yang ; Bonggil Hyun ; Ja-Myung Kim ; Jae Hoon Noh ; Miok Kim ; Bokyung Kong ; Dong Han Choi ; Su-Jin Choi ; Pung-Guk Jang ; Hae Jin Jeong
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：May 6, 2014
• 年：2014
• 卷：48
• 期：9
• 页码：4750-4756
• 全文大小：399K
• 年卷期：v.48,no.9(May 6, 2014)
• ISSN：1520-5851

文摘

Oceanic dimethyl sulfide (DMS) is the enzymatic cleavage product of the algal metabolite dimethylsulfoniopropionate (DMSP) and is the most abundant form of sulfur released into the atmosphere. To investigate the effects of two emerging environmental threats (ocean acidification and warming) on marine DMS production, we performed a large-scale perturbation experiment in a coastal environment. At both ambient temperature and 2 掳C warmer, an increase in partial pressure of carbon dioxide (pCO₂) in seawater (160鈥?30 ppmv pCO₂) favored the growth of large diatoms, which outcompeted other phytoplankton species in a natural phytoplankton assemblage and reduced the growth rate of smaller, DMSP-rich phototrophic dinoflagellates. This decreased the grazing rate of heterotrophic dinoflagellates (ubiquitous micrograzers), resulting in reduced DMS production via grazing activity. Both the magnitude and sign of the effect of pCO₂ on possible future oceanic DMS production were strongly linked to pCO₂-induced alterations to the phytoplankton community and the cellular DMSP content of the dominant species and its association with micrograzers.