Heterocapsa busanensis sp. nov. (Peridiniales, Dinophyceae): A new marine thecate dinoflagellate from Korean coastal waters

Choi, Hojoon; Kim, Sun-Ju

doi:10.1016/j.ejop.2021.125797

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…The phylogenetic analysis clearly showed that both strains analysed belong to the genus Heterocapsa. The strain 19PV99 clustered in a group of sequences including strains ascribed with different names but recently interpreted as H. pygmaea clade (Choi and Kim 2021). Whereas the strain 20PV100, the one exposed to the different trace metals, appeared closely related to H. bohaiensis, as indicated by phylogenetic position and p-distances calculated on the ITS region.…”

Section: Discussionmentioning

confidence: 91%

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

MÉRIOT,

ROUSSEL,

BRUNET

et al. 2024

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RC -reaction center; rDNA -ribosomal deoxyribonucleic acid; RLC -rapid light curves; ROS -reactive oxygen species. Acknowledgments: The authors acknowledge Ifremer for supporting the Maorix project, Cresica for supporting the MICROCOMET project, and the South Province of New Caledonia for financing the PhD fellowship of V. Meriot and for delivering the sampling authorization (20274-2019/2-ISP/DENV). We would like to thank Adecal Technopole for its technical support. †

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Section: Discussionmentioning

confidence: 91%

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

MÉRIOT,

ROUSSEL,

BRUNET

et al. 2024

Photosynt.

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“…Since most Heterocapsa species are relatively small and morphologically similar, they are difficult to differentiate from each other by conventional light microscopy (Horiguchi 1995, Iwataki 2008. The presence of Heterocapsa species in the tropical Asian region is limited to a few records with new species descriptions (Iwataki et al 2009, Xiao et al 2018, Benico et al 2021, Choi and Kim 2021) and they have never been previously encountered in Malaysian waters. Given the sparse knowledge of this harmful species, particularly of the tropical populations, it is thus, important to gain more information regarding the species occurrence, distribution, and the environmental driving factors that permit Heterocapsa to bloom at unpredictable intervals of time.…”

Section: Spatio-temporal Distribution Of Heterocapsa Species In Johor...mentioning

confidence: 99%

Diversity of <i>Heterocapsa</i> (Dinophyceae) and the algal bloom event in the mariculture areas of Johor Strait, Malaysia

Razali¹,

Mustapa²,

Yaacob³

et al. 2022

Plankton Benthos Res

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In November 2020, a high biomass multi-species algal bloom caused heavy water discoloration in the fish and mussel farm areas of the Johor Strait, Malaysia. A total of 19 microalgal taxa were identified from the plankton samples collected during the bloom event. Eleven genera were diatoms, and eight genera were dinophytes. The microalgal composition was dominated by the diatom Guinardia sp., with an average cell density of 1.7×10 6 cells L −1 , making up 65-80% of the phytoplankton composition. Concomitantly, high densities of the dinophytes Heterocapsa minima (3.8-5.3×10 5 cells L −1 ) and Karlodinium spp. (3.5-6.6×10 3 cells L −1 ) were found. This is the first record of the occurrence of H. minima in Malaysian waters. Detailed morphological observations of H. minima based on scanning electron microscopy are presented in this study. To have a better insight into the Heterocapsa species assemblages in the Johor Strait, the diversity of Heterocapsa species assemblages along the strait was investigated based on a metabarcoding approach. Environmental DNA collected between 2018 and 2019 was used for high throughput amplicon sequencing targeting the small subunit (SSU) ribosomal RNA gene marker. The metabarcoding analysis detected three rare Heterocapsa species in the waters, H. niei, H. rotundata, and H. steinii. The results showed that Heterocapsa species assemblages varied temporally across the strait, with higher species diversity and amplicon sequence variant (ASV) read abundances detected in the Eastern Johor Strait. Although no fish/shellfish kills were sighted during the 2020 bloom event, the presence of harmful microalgal species, such as Heterocapsa minima and Karlodinium spp., urged the need for a comprehensive HAB monitoring program in the Strait to safeguard the aquaculture industry in the areas.

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“…This is particularly true for species of the genus Heterocapsa, a cosmopolitan genus identified in blooms associated with fish kill events, although it may not always be the dominant organism (Wang et al, 2005;Roberts et al, 2019). Some Heterocapsa species, especially in the Western Pacific region, are known to cause HABs (Horiguchi, 1995;Matsuyama, 1999;Iwataki, 2008;Choi and Kim, 2021). Blooms of H. circularisquama in Japan led to substantial mortality among cultured and wild bivalve mollusks in the late 1980s, significantly impacting the local bivalve culture industry, particularly the pearl oyster sector (Matsuyama, 1999(Matsuyama, , 2012.…”

Section: Introductionmentioning

confidence: 99%

Characterization and inter-strain variability in ichthyotoxicity of Heterocapsa ovata (Peridiniales, Dinophyceae) from temperate waters of South Australia

Verma,

Gaiani,

Hoppenrath

et al. 2024

Front. Protistol.

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IntroductionHarmful algal bloom (HAB)-forming species and populations exhibit substantial intraspecific functional trait variation, which can confer eco-evolutionary advantages. Phenotypic variability among populations can buffer the immediate detrimental effects of environmental fluctuations, with more diverse populations expected to survive changing conditions more efficiently than their uniform counterparts.MethodsIn February 2014, a mixed fish-killing dinoflagellate bloom occurred in the temperate waters of Coffin Bay, South Australia, causing the death of oysters and fish in the area. The bloom was dominated by Karenia mikimotoi and a cryptic species of Heterocapsa. Twenty-one monoclonal Heterocapsa isolates were established from the site and identified as H. ovata using microscopy and universal ribosomal markers (ITS/5.8S and LSU D1/D3 rDNA regions; SSU and cob were used for amplicon sequencing). These isolates were tested for ichthyotoxicity using a bioassay based on cells from the gills of rainbow trout (Oncorhynchus mykiss). Culture fraction preparations (whole cells, supernatant, and lysed cells) were analyzed to determine ichthyotoxicity levels.ResultsThe highest ichthyotoxicity was observed in lysed cells, with surprisingly high inter-strain variability. This suggests that different strains of H. ovata have varying levels of toxicity.DiscussionResults from this study expand our understanding of the adaptive strategies of HAB species and enable predictions of future population dynamics under changing climatic conditions. The substantial phenotypic variability among H. ovatastrains highlights the potential for diverse responses to environmental stressors, underscoring the importance of considering intraspecific variation in ecological and evolutionary studies of HABs.

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Heterocapsa busanensis sp. nov. (Peridiniales, Dinophyceae): A new marine thecate dinoflagellate from Korean coastal waters

Cited by 11 publications

References 43 publications

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

Diversity of <i>Heterocapsa</i> (Dinophyceae) and the algal bloom event in the mariculture areas of Johor Strait, Malaysia

Characterization and inter-strain variability in ichthyotoxicity of Heterocapsa ovata (Peridiniales, Dinophyceae) from temperate waters of South Australia

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