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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41237

Title: Pigmented Nanoflagellates Grazing on Synechococcus: SeasonalVariations and Effect of Flagellate Size in the CoastalEcosystem of Subtropical Western Pacific
Authors: Chih-hao Hsieh
Ya-Fan Chan
An-Yi Tsai
Kuo-Ping Chiang
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Date: 2009-10
Issue Date: 2017-02-10T07:01:56Z
Publisher: Microbial Ecology
Abstract: Abstract: We investigated seasonal variation of grazing impact of the pigmented nanoflagellates (PNF) with different sizes upon Synechococcus in the subtropical western Pacific coastal waters using grazing experiments with fluorescently labeled Synechococcus (FLS). For total PNF, conspicuous seasonal variations of ingestion rates on Synechococcus were found, and a functional response was observed. To further investigate the impact of different size groups, we separated the PNF into four categories (<3, 3–5, 5–10, and >10 μm). Our results indicated that the smallest PNF (<3 μm PNF) did not ingest FLS and was considered autotrophic. PNF of 3–5 μm in size made up most of the PNF community; however, their ingestion on Synechococcus was too low (0.1–1.9 Syn PNF−1 h−1) to support their growth, and they had to depend on other prey or photosynthesis to survive. The ingestion rate of the 3–5 μm group exhibited no significant seasonal variation; by contrast, the ingestion rates of 5–10 and >10 μm PNFs showed significant seasonal variation. During the warm season, 3–5 μm PNF were responsible for the grazing of 12% of Synechococcus production, 5–10 μm PNF for 48%, and >10 μm PNF for 2%. Taken together, our results demonstrate that the PNF of 3–10 μm consumed most Synechococcus during the warm season and exhibited a significant functional response to the increase in prey concentration.
Relation: 58(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41237
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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