Morphological and excystment characteristics of Scrippsiella trochoidea cysts from surface sediments in hypoxic bottom waters of Gamak Bay, the South Sea of Korea

Title
Morphological and excystment characteristics of Scrippsiella trochoidea cysts from surface sediments in hypoxic bottom waters of Gamak Bay, the South Sea of Korea
Author(s)
신현호; 정승원; 이은선; 장민철; 김영옥
KIOST Author(s)
Shin, Hyeon Ho(신현호)Jung, Seung Won(정승원)Kim, Young Ok(김영옥)
Publication Year
2010-05-19
Abstract
To investigate the effect of hypoxic environments on the resting stage of planktonic organisms, a cyst population of Scrippsiella trochoidea was monthly monitored in two different sites, hypoxic (G1) and normoxic zone (G2) of Gamak Bay from February 2009 to February 2010. Hypoxia indicating a lower level of dissolved oxygen (< 2.0 mg/L) was developed in the bottom waters of G1 in August however was not occurred at G2. Morphological and excystment characteristics of S. trochoidea cysts isolated from the natural sediment samples in the sites were compared. Two morphotypes of S. trochoidea cysts, one typical type with short calcitic spines (spiny type) and another transparent type without the calcareous outer wall (nude type), were simultaneously detected in the surface sediments. Most of the cyst distributed at G2 was the spiny type while nude type cysts were abundant at G1. The abundances of nude type cysts were relatively high in the winter and spring (January to June) when the vegetative population was not detected or occurred in lower abundances. On the contrary, higher abundances of spiny type cysts were in the summer (July to September), which is coincided with flourishing of vegetative cells in the water column. Excystment capability of S. trochoidea cysts exhibited over the excystment ratio of 35% from March to May and the maximum ratio (> 70%) at G1, however there was no difference in the seasonal germination pattern between two sites. As the outer wall of S. trochoidea cysts is composed of calcium carbonate, the cyst surface can theoretically be solved in the acidic environments produced by the fermentation process in hypoxic bottom waters. It can be also assumed that grazing effect of benthic deposit feeders is contributed to break out the morphological change of S. trochoidea cysts.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28972
Bibliographic Citation
4th China- Japan-Korea GLOBEC/IMBER SYMPOSIUM, pp.30, 2010
Publisher
NFRDI, KORDI and JEJU SEA GRANT
Type
Conference
Language
English
Publisher
NFRDI, KORDI and JEJU SEA GRANT
Related Researcher
Research Interests

Marine ecology,Plankton,Protists,해양생태,부유생물,원생생물

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