Potential Assessment of Target Alga Chattonella Marina (Raphidophyceae) and Non-Target Marine Plankton to Yellow Clay and Thiazolidinedione Derivative Td49 in A Mesocosm Enclosure

Title
Potential Assessment of Target Alga Chattonella Marina (Raphidophyceae) and Non-Target Marine Plankton to Yellow Clay and Thiazolidinedione Derivative Td49 in A Mesocosm Enclosure
Author(s)
백승호
KIOST Author(s)
Baek, Seung Ho(백승호)
Publication Year
2018-06-12
Abstract
We examined the effects of the algicide thiazolidinedione (TD49) and yellow clay on target alga Chattonella marina and assessed their ecological risk for the non-target planktonic community. Mesocosm (1000 L) exposure experiments were employed to investigate time-course responses over 9 days. The growth of C. marina was controlled at ≥0.4 μM TD49 but not inhibited in yellow clay treatments. Although the algicidal activity of the 0.4-μM TD49 + 0.4 kg t-1 yellow clay treatment for C. marina was high (72.5 % at 24 h), target alga regrowth occurred. In all treatments, inorganic nutrients such as nitrate + nitrite and phosphate decreased following commencement of the experiment but were >1 μM (limitation concentration) at days 5 and 6, even though consumption pattern of those nutrients was influenced by the TD49 concentration. Depletion of silicate in initial stages played an important role in controlling the shift from diatoms including Chaetoceros and Skeletonema spp. to cryptophytes. Zooplankton were not affected by even the highest the yellow clay treatments and TD concentration of <0.8 μM, but their abundance significantly reduced after day 1 at 0.8 μM TD49. Zooplankton nauplii gradually increased to the end of the experimental period, implying that TD49 may have a limited effect on zooplankton communities. The initial dosing concentration of each substance and the fate of nutrients following algicide applicatiyed to investigate time-course responses over 9 days. The growth of C. marina was controlled at ≥0.4 μM TD49 but not inhibited in yellow clay treatments. Although the algicidal activity of the 0.4-μM TD49 + 0.4 kg t-1 yellow clay treatment for C. marina was high (72.5 % at 24 h), target alga regrowth occurred. In all treatments, inorganic nutrients such as nitrate + nitrite and phosphate decreased following commencement of the experiment but were >1 μM (limitation concentration) at days 5 and 6, even though consumption pattern of those nutrients was influenced by the TD49 concentration. Depletion of silicate in initial stages played an important role in controlling the shift from diatoms including Chaetoceros and Skeletonema spp. to cryptophytes. Zooplankton were not affected by even the highest the yellow clay treatments and TD concentration of <0.8 μM, but their abundance significantly reduced after day 1 at 0.8 μM TD49. Zooplankton nauplii gradually increased to the end of the experimental period, implying that TD49 may have a limited effect on zooplankton communities. The initial dosing concentration of each substance and the fate of nutrients following algicide applicati
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23232
Bibliographic Citation
The 2nd International Conference on Bioresources, Energy, Environment, and Materials Technology, pp.483, 2018
Publisher
BEEM
Type
Conference
Language
English
Publisher
BEEM
Related Researcher
Research Interests

Marine Ecology,Marine Environment,HABs,해양생태,해양환경,적조

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