Dense winter bloom of the dinoflagellate Heterocapsa triquetra below the thick surface ice of brackish Lake Shihwa, Korea SCIE SCOPUS

Cited 16 time in WEB OF SCIENCE Cited 16 time in Scopus
Title
Dense winter bloom of the dinoflagellate Heterocapsa triquetra below the thick surface ice of brackish Lake Shihwa, Korea
Author(s)
Baek, Seung H.; Ki, Jang S.; Katano, Toshiya; You, Kai; Park, Bum S.; Shin, Hyeon H.; Shin, Kyoungsoon; Kim, Young O.; Han, Myung-Soo
KIOST Author(s)
Baek, Seung Ho(백승호)Shin, Hyeon Ho(신현호)Shin, Kyoung Soon(신경순)Kim, Young Ok(김영옥)
Publication Year
2011-10
Abstract
We investigated the seasonal abundance of the dinoflagellate Heterocapsa triquetra (Ehrenberg) F. Stein, as well as the relevant in situ environmental factors, in brackish Lake Shihwa, Korea. We also examined the growth rates and morphological characteristics of the species in laboratory cultures. In the field, the population densities of H. triquetra remained at low levels from late spring to early summer, and then completely disappeared from August to November 2007. Interestingly, a dense bloom of H. triquetra appeared below the ice surface on 17 January 2008; identities of the cells were confirmed by rDNA sequence comparisons. The second peak reached a density of 672 103 cells L(-1) on 28 March 2008, at a water temperature of 9.1 degrees C. Laboratory experiments showed that growth rates of H. triquetra increased with incremental temperature increases within the range of 10 and 20 degrees C. The highest growth rate reached by H. triquetra was 0.62 d(-1) at 20 degrees C with a salinity of 30. Above 25 degrees C, the dinoflagellate was unable to grow between salinities of 10 and 15, and reached only relatively low growth rates (<0.12 d-1) under other salinity conditions. However, under continuous cultures at 5 degrees C and 8 degrees C, H. triquetra cells retained its growth capability for more than 12 days, implying that H. triquetra can survive and grows even at very low temperatures. The equivalent spherical diameter (ESD) of H. triquetra did not change markedly between 10 and 25 degrees C, but the equivalent spherical diameter was significantly different at 5 degrees C. The cell volume buildup of H. triquetra at low temperatures is one of the important survival strategies to overcome the harsh environmental conditions. These characteristics make H. triquetra a consistently dominant dinoflagellate in Lake Shihwa during the cold winter season.
ISSN
1322-0829
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3809
DOI
10.1111/j.1440-1835.2011.00626.x
Bibliographic Citation
PHYCOLOGICAL RESEARCH, v.59, no.4, pp.273 - 285, 2011
Publisher
WILEY-BLACKWELL
Subject
NEUSE RIVER ESTUARY; RED-TIDE; NORTH-CAROLINA; PLANKTONIC COPEPODS; COASTAL WATERS; ACARTIA-OMORII; SAGAMI BAY; INLAND SEA; GROWTH; JAPAN
Keywords
equivalent spherical diameter; Heterocapsa triquetra; salinity; temperature; winter bloom
Type
Article
Language
English
Document Type
Article
Publisher
WILEY-BLACKWELL
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