Study on the outbreak and extinction mechanisms of marine harmful microalga Cochlodinium polykrikoides in Southern Sea of Korea in 2016

Title
Study on the outbreak and extinction mechanisms of marine harmful microalga Cochlodinium polykrikoides in Southern Sea of Korea in 2016
Author(s)
백승호; 이민지
KIOST Author(s)
Baek, Seung Ho(백승호)Lee, Minji(이민지)
Publication Year
2017-09-25
Abstract
In Korea, red tide events by dino agellate Cochlodinium occur every year and affect serious economic losses to sheries. In particular, the chain form of Cochlodinium is known to cause sh death by gill-clogging when its abundance exceeds approximately 1000 cells ml-1. The study aims to clarify the outbreak/extinction mechanisms of marine harmful microalga Cochlodinium polykrikoides blooms based on the physical, chemical and biological environments (i.e., vertical structure of sea water, nutritional characteristics and biological interaction etc.). At near coast of St. 22, there was no signi cant difference between temperature of upper and bottom layers, and high nutrient was kept in surface layer. These suggest that wind driven coastal upwelling have supplied nutrients to the euphotic zone. In August, low salinity water (below 30 psu) at offshore front station was constantly observed, which may have originated from Changjiang River discharge inChina. Such events of upwelling and introduction of Changjiang Diluted Water can lead to nutrient-rich environmental condition, indicating that the diatom species respond to pulsed nutrient loading and dominate in Tongyeong coastal area. For these reasons, red tide of dino agellate Cochlodinium in 2016 did not occur in late July and early August normally. In late August of 2016, however, the Cochlodinium bloom occurred in Goheung area partly, which was delayed about a month.pproximately 1000 cells ml-1. The study aims to clarify the outbreak/extinction mechanisms of marine harmful microalga Cochlodinium polykrikoides blooms based on the physical, chemical and biological environments (i.e., vertical structure of sea water, nutritional characteristics and biological interaction etc.). At near coast of St. 22, there was no signi cant difference between temperature of upper and bottom layers, and high nutrient was kept in surface layer. These suggest that wind driven coastal upwelling have supplied nutrients to the euphotic zone. In August, low salinity water (below 30 psu) at offshore front station was constantly observed, which may have originated from Changjiang River discharge inChina. Such events of upwelling and introduction of Changjiang Diluted Water can lead to nutrient-rich environmental condition, indicating that the diatom species respond to pulsed nutrient loading and dominate in Tongyeong coastal area. For these reasons, red tide of dino agellate Cochlodinium in 2016 did not occur in late July and early August normally. In late August of 2016, however, the Cochlodinium bloom occurred in Goheung area partly, which was delayed about a month.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23820
Bibliographic Citation
PICES-2017 Annual Meeting, pp.175, 2017
Publisher
North Pacic Marine Science Organization
Type
Conference
Language
English
Publisher
North Pacic Marine Science Organization
Related Researcher
Research Interests

Marine Ecology,Marine Environment,Phytoplankton,해양생태,해양환경,식물플랑크톤

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse