亞熱帶水庫漂浮性及附著性異營細菌的生 產力、豐度、與單位生長率之動態與調控;DYNAMICS AND CONTROLS OF FREE-LIVING AND ATTACHED HETEROTROPHIC BACTERIAL PRODUCTION, ABUNDANCE AND SPECIFIC GROWTH RATES IN A SUBTROPICAL RESERVOIR

NCU Institutional Repository > 地球科學學院 > 地球系統科學國際研究生博士學位學程 > 博碩士論文 > Item 987654321/77251

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题名:	亞熱帶水庫漂浮性及附著性異營細菌的生產力、豐度、與單位生長率之動態與調控;DYNAMICS AND CONTROLS OF FREE-LIVING AND ATTACHED HETEROTROPHIC BACTERIAL PRODUCTION, ABUNDANCE AND SPECIFIC GROWTH RATES IN A SUBTROPICAL RESERVOIR
作者:	艾琳娜;Austria, Eleanor S.
贡献者:	國際研究生博士學位學程
关键词:	異營性細菌;營養鹽限制;颱風;顆粒態有機碳;實驗室操控實驗;漂浮性細菌與附著性細菌;heterotrophic bacteria;mineral-limited;typhoon;POC;free-living and attached bacteria;laboratory manipulation
日期:	2018-06-26
上传时间:	2018-08-31 14:28:50 (UTC+8)
出版者:	國立中央大學
摘要:	摘要在一個營養鹽限制的亞熱帶淡水系統11年研究中，漂浮性與附著性異營細菌生產力、細菌豐度與個體生長率的動態變化受到溫度與營養供應物質變化的影響。溫度有顯著正面影響細菌生產力在特別的時空尺度上（每小時，季節性，年間，與十年間週期），但影響程度亦受到營養物質供應的修正。在氣溫逐漸變暖和變冷的季節裡，漂浮性與附著性細菌兩者對於溫度的反應不同，暖季時漂浮性細菌生產力會減緩對於溫度反應程度，實驗室的操控實驗結果顯示了這可能是受到來自碳、氮、磷等基礎物質供應的個別或共同限制。此外，細菌生產力的時間變化上顯示了極端氣候會影響漂浮性與附著性細菌的動態，因為來自強烈颱風的強降雨改變了顆粒態有機物質與磷酸鹽的分布，且附著性細菌受益於此要比漂浮性來的多。前人的研究顯示了兩種不同生活型態的細菌對於有機物質的利用有不同的方式，且對於環境控制因子的反應也有所不同，故附著性細菌在此狀況下可能佔有總細菌生產力的主要地位。這在對於評估有機物質的微生物處理過程產生重要的影響。關鍵字: 異營性細菌, 營養鹽限制, 颱風, 顆粒態有機碳, 實驗室操控實驗, 漂浮性細菌與附著性細菌 ;An 11- year investigation of the free-living and attached bacterial production, abundance and specific growth rates in a mineral-limited, subtropical freshwater system revealed large variability in the dynamics that is influenced by temperature and substrate availability. Temperature has a significant positive effect on bacterial production at several spatial and temporal (hours, seasonal, interannual and decadal) scales; but the effect is modified by the availability of substrate. Free-living and attached bacteria showed dissimilar response to temperature shifts (increasing and decreasing temperature) with a decline in free-living BP during the warmest months. This may be brought about by the limitation and co-limitation with carbon, nitrogen and phosphates that was confirmed during the laboratory manipulation experiments. In addition to thehourly, seasonal, interannual and decadal controls of bacterial production, it was also revealed that episodic events can influence the dynamics of free-living and attached bacteria. Heavy precipitation from strong typhoons caused changes in the dynamics of particulate organic compounds and phosphate which benefitted the attached more than the free-living bacteria. The previously reported dissimilar abilities of the two bacterial lifestyles to process organic matter and the observed dissimilar response to environmental controls showed how the attached bacteria can dominate the total production. This can have important consequences on the assessment of microbial processing of organic matter.
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