Investigating the Impact of Global Change on the Ecosystem and Environmental Conditions in the East China Sea and Kuroshio Region on Microbial Carbon Flux—Viral Lysis and Nanoflagellate Grazing

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Project title

Code/計畫編號

MOST106-2611-M019-014

Translated Name/計畫中文名

全球變遷因子對東海及西北太平洋黑潮海域微生物循環圈能量傳遞之影響(Ⅲ)：病毒裂解與微細鞭毛蟲攝食

Project Coordinator/計畫主持人

An-Yi Tsai

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Marine Environment and Ecology

Website

https://www.grb.gov.tw/search/planDetail?id=12238096

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

01-07-2018

Bugetid/研究經費

1681千元

ResearchField/研究領域

海洋科學

"二十一世紀正是人類生存在因溫室效應所導致全球變遷的時代，如果溫室效應未能獲得有效的控制，全球變遷終將導致整個地球氣候以及海洋循環的改變。然而海洋生態系食物鏈運轉過程中各食物階層對全球變遷的反應程度為何?目前仍尚未有具體的答案。在一般水域生態系統中，細菌是溶解性有機碳的主要消耗者，且扮演著調節有機碳的生地化循環之重要角色。因此，細菌被移除過程的方式也影響到水體有機碳的流向，一般而言，原生生物的攝食過程即能將有機碳及能量往上一階食物階層傳遞。而病毒的裂解過程，則會將有機碳及營養鹽快速釋放於水體中，進而促使細菌再次有效利用。因此本實驗即要了解在全球變遷海洋暖化過程中，溫度的增加是否會對細菌生產及被移除的能力產生影響？本研究使用modified dilution method 培養24 小時來量測細菌成長率，細菌被攝食率及被病毒裂解率。本研究分別將實驗組分成兩組，控制組為培養在自然環境溫度，另一組為控溫加熱實驗組（約高於環境溫度3℃）。最後可經由實驗結果推測海洋暖化是否會對臺灣東北沿岸海域微細鞭毛蟲產生明顯攝食增加，進而控制細菌隨溫度增加的生產量。" "The word is steadily warming and induced global change in 21th century, in turn; the Earth＇s climatic system and oceanic water circulation will be affected by global change. However, how global warming will affect the ecosystem of marine food chain and structure is under debate. It is well established that a significant fraction of the total carbon flux in marine food webs passes through heterotrophic bacteria. Thus, the fate of bacterial production has important implications for the ecology of microbial food webs and biogeochemical cycling in these systems. The relative contribution of viruses and grazers to bacterial mortality has important consequences for the processing and transfer of organic matter in the ocean. When bacterial cells are grazed, energy is made available to higher trophic levels, whereas when they are lysed, viruses redirect matter and energy away from higher trophic levels and generate substrates for non-infected bacteria. The goal of this study investigated the effect of rising temperatures on bacterial growth and mortality in coastal waters of the western subtropical Pacific Ocean. To do this, water samples were incubated for 24 h at ambient and experimentally increased temperatures (averages 3℃ higher than in situ values) and analyzed for bacterial growth, grazing and viral lysis using a modified dilution method. These findings can forecast that short-term warming changed the function of the microbial food web by increasing the rates of bacterial production and the bacterial carbon flux to predators in our study environment."

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Investigating the Impact of Global Change on the Ecosystem and Environmental Conditions in the East China Sea and Kuroshio Region on Microbial Carbon Flux—Viral Lysis and Nanoflagellate Grazing

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