Plankton Ecological Processes in Subtropical-Shelf Ecosystems- Studies of Energy Flux in Classical and Microbial Food Webs(III)

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Project title

Code/計畫編號

MOST109-2611-M019-014

Translated Name/計畫中文名

副熱帶陸棚浮游生物食物網生態過程研究-傳統食物鏈與微生物循環圈能量傳遞過程研究及超微細植物性浮游生物在金瓜石陰陽海與周遭清澈水域之間數量及成長率季節變化差異之研究(III)

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=13532045

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

2468千元

ResearchField/研究領域

海洋科學

動物性浮游生物能夠攝食來自傳統食物鏈(植物性浮游生物)及微生物環中(如纖毛蟲)之生物量，因此動物性浮游生物扮演著支撐此漁場的重要角色。然而針對動物性浮游生物攝食的食物來源(如植物性浮游生物、纖毛蟲等)的研究十分有限。因此本研究即想要建立一個簡易的食階模式，來探討傳統食物鏈(植物性浮游生物)及微生物環(纖毛蟲)之能量傳遞過程變化。本研究模式主要假設動物性浮游生物族群主要攝食範圍是> 20 μm的植物性浮游生物。而<20 μm的植物性浮游生物則是經由纖毛蟲攝食影響而將能量傳遞至動物性浮游生物。據此本實驗利用2種不同濾網大小之分割過濾法 (原水(A)，200 μm 過濾後濾液(B)及20 μm 過濾後濾液(C))及50 %稀釋培養法(50 %的200 μm 過濾後濾液與50% GF/F 濾液混合(D))，來估計植物性浮游生物成長以及能量傳遞的差異。本研究預計於東海南部海域中之馬祖附近海域，湧升流海域及台灣海峽水流經的貧營養海域進行上述培養實驗。在模式建立後即可了解各參數在富營養鹽及貧營養鹽中的差異。 Food sources from grazing food chain (e.g. phytoplankton) and microbial food web (e.g. ciliates) are available by mesozooplankton, as its role for supporting the fishery. As for the studies of food sources of mesozooplankton is limited so far, thus we consider to build a simple food web model in this study, for understanding and discussing the variations in carbon flux between grazing food chain (phytoplankton) and microbial food web in marine ecosystems. In thissimple food web model, we hypothesis that the major preys size of mesozooplankton is > 20 um phytoplankton population, on the other hand, < 20 um prey size of phytoplankton is transfer to higher trophic levels by ciliate grazing in this study. Based on these consider, we used two different kinds of size fractionation for this experiment (unfiltered (A treatment), 200 um fraction (Btreatment) and 20 um fraction (C treatment), and 50% dilution experiment (combined with 50% of 200 um fraction and 50% of GF/F fraction), for estimating the growth rates and carbon flux in this simple food web model. Water samplings from coastal water and upwelling area with eutrophic environments, and Taiwan Current Water with oilgotrophic environments for above incubation experiments, and build these food web model for discussing the variations of growth and grazing rates in eutrophic and oligotrophic environments.

Keyword(s)

傳統食物鏈
微生物循環圈
動物性浮游生物
植物性浮游生物
grazing food chain
microbial loop
zooplankton
phytoplankton

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Plankton Ecological Processes in Subtropical-Shelf Ecosystems- Studies of Energy Flux in Classical and Microbial Food Webs(III)

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