Spatial Variation of Picoplankton and Nanoflagellates in a Tropical Eutrophic Lagoon (Tapong Bay) in Relation to Hydrographic Conditions and Predators

本研究主要在熱帶富營養鹽瀉湖環境，針對picoplannkton及nanoflagellates之時空分布進行研究。本實驗為期七個月分4個航次（1999年12月，2000年3，4及6月）並於瀉湖中設立10個測站，每個測站各採3個深度水樣。本研究環境可分乾季及雨季，於2000年6月主要是為雨季的採樣，此期間發現細菌之空間分布會受到植物性浮游生物大量成長所排放的有機物質影響而產生劇烈的變化。其餘在乾季的採樣期間，細菌的高值會在瀉湖內部產生，且數量會隨著出海口逐漸減少，此時細菌主要來自於河川，且空間變化是受到河川注入所影響。相對於異營性細菌，自營性藍綠細菌Synechococcus spp.之空間分布與細菌相反，其高值主要在出海口附近出現。再者本研究結果發現nanoflagellates的數量變化主要是受到上階攝食者所影響。

關鍵字

瀉湖；藍綠細菌；噬菌性微細鞭毛蟲

並列摘要

This study provided information on the dynamics of picoplankton and nanoflagellates in a tropical eutrophic lagoon. Here we present the temporal and spatial variations in abundances of heterotrophic and autotrophic (cyanobacteria Synechococcus spp.) picoplankton as well as phagotrophic nanoflagellates from 4 dates, 10 stations and 3 depths during a 7-month period (December 1999, and March, April and June 2000). The final investigation, conducted after the onset of a rainy season, showed drastically different patterns of bacterial abundance across the lagoon and between various depths. The bacterial growth may have been stimulated by extra organic matter produced by a phytoplankton bloom. In all other investigations, the highest values were found in the inner lagoon, gradually decreasing outward. This suggested that these native bacteria in fresh water may have been brought into the lagoon by river water. In contrast to bacteria, autotrophic cyanobacteria Synechococcus spp. had a higher density in the outer lagoon than in the inner-lagoon. Furthermore, our results suggested that the abundance of nanoflagellates in the Tapong Bay is controlled by their predators.

並列關鍵字

Lagoon ； Cyanobacterium Synechococcous spp. ； Phagotrophic nanoflagellate

國際替代計量

Spatial Variation of Picoplankton and Nanoflagellates in a Tropical Eutrophic Lagoon (Tapong Bay) in Relation to Hydrographic Conditions and Predators

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