Effects of intrusion and retreat of deep cold waters on the causative species of red tides offshore in the South Sea of Korea

Ok, Jin Hee; Jeong, Hae Jin; Lim, An Suk; You, Ji Hyun; Yoo, Yeong Du; Kang, Hee Chang; Park, Sang Ah; Lee, Moo Joon; Eom, Se Hee

doi:10.1007/s00227-022-04153-5

Cited by 6 publications

(1 citation statement)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dinoflagellates have three major trophic modes (autotrophy, heterotrophy, and mixotrophy) and serve as various types of prey and predators (Schnepf and Elbrächter 1992, Stoecker et al 2017. They often form red tides or harmful algal blooms (HABs), accounting for 75% of all HAB species, resulting in extensive global damage in marine ecosystems (Smayda 1997, Hallegraeff 2004, Sakamoto et al 2021, Ok et al 2023b). Thus, understanding the ecophysiological characteristics of dinoflagellates is crucial for comprehending the structure and function of marine ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Protists in hypoxic waters of Jinhae Bay and Masan Bay, Korea, based on metabarcoding analyses: emphasizing surviving dinoflagellates

Ok,

Jeong,

Kang

et al. 2023

Algae

Self Cite

View full text Add to dashboard Cite

Hypoxia can indeed impact the survival of protists, which play a crucial role in marine ecosystems. To better understand the protistan community structure and species that can thrive in hypoxic waters, we collected samples from both the surface and bottom waters during the hypoxic period in Jinhae and Masan Bays and the non-hypoxic period in Jinhae Bay. Subsequently, we utilized metabarcoding techniques to identify the protistan species. During hypoxia, with dissolved oxygen concentrations of 0.8 mg L<sup>-1</sup> in Jinhae Bay and 1.8 mg L<sup>-1</sup> in Masan Bay within the bottom waters, the phylum Dinoflagellata exhibited the highest amplicon sequence variants richness among the identified protist phyla. Following the Dinoflagellata, Ochrophyta and Ciliophora also displayed notable presence. In hypoxic waters of Jinhae and Masan Bays, we identified a total of 36 dinoflagellate species that exhibited various trophic modes. These included one autotrophic species, 14 mixotrophic species, 9 phototrophic species with undetermined trophic modes (either autotrophic or mixotrophic), 2 kleptoplastidic species, and 10 heterotrophic species. Furthermore, the hypoxic bottom water exhibited a greater number of heterotrophic dinoflagellate species compared to the non-hypoxic surface water within the same water column or the non-hypoxic bottom water. Therefore, feeding by mixotrophic and heterotrophic dinoflagellates may be partially responsible for their dominance in terms of the number of species surviving in hypoxic waters. This study not only introduces the initial documentation of 26 dinoflagellate species surviving in hypoxic conditions but also establishes a foundation for a more comprehensive understanding of the ecophysiology of dinoflagellates in hypoxic marine environments.

show abstract

Section: Introductionmentioning

confidence: 99%

Protists in hypoxic waters of Jinhae Bay and Masan Bay, Korea, based on metabarcoding analyses: emphasizing surviving dinoflagellates

Ok,

Jeong,

Kang

et al. 2023

Algae

Self Cite

View full text Add to dashboard Cite

show abstract

Density-dependent inhibition among four major dinoflagellate species causing red tides in Korean waters

Ok,

Jeong,

Lee

et al. 2023

Mar Biol

View full text Add to dashboard Cite

Interactions between the calanoid copepod Acartia hongi and the bloom-forming dinoflagellates Karenia bicuneiformis and K. selliformis

Ok,

Jeong,

You

et al. 2024

Mar Biol

View full text Add to dashboard Cite

Copepods are a major component of metazooplankton and important prey for fish and invertebrates such as crabs, shrimps, and flatworms. Certain bloom-forming dinoflagellates can kill copepods, but there is little research on the interactions between copepods and the bloom-forming dinoflagellates Karenia bicuneiformis and K. selliformis. In this study, the survival and ingestion rates of the calanoid copepod Acartia hongi feeding on K. bicuneiformis and K. selliformis were determined as a function of prey concentration. On day 2, the survival of A. hongi incubated with K. bicuneiformis was 90–100% at all the tested prey concentrations, while that with K. selliformis was 0–20% at ≥ 582 ng C mL−1. Compared to other harmful dinoflagellates from the literature, K. bicuneiformis caused low mortality of Acartia; however, K. selliformis caused almost the highest mortality at similar dinoflagellate concentrations. With increasing mean prey concentration, the ingestion rates of A. hongi feeding on K. bicuneiformis increased on day 1, but those on K. selliformis did not increase. Acartia hongi stopped feeding on K. bicuneiformis at mean prey concentrations of ≥ 341 ng C mL−1 and K. selliformis at all prey concentrations on day 2. At the prey concentration of 1000 ng C mL−1, the ingestion rate of A. hongi feeding on K. bicuneiformis was moderate among the rates of Acartia spp. feeding on harmful dinoflagellates; however, that on K. selliformis was the lowest. These results indicate that K. bicuneiformis and K. selliformis differentially affect the survival and ingestion rates of A. hongi.

show abstract

Effects of intrusion and retreat of deep cold waters on the causative species of red tides offshore in the South Sea of Korea

Cited by 6 publications

References 92 publications

Protists in hypoxic waters of Jinhae Bay and Masan Bay, Korea, based on metabarcoding analyses: emphasizing surviving dinoflagellates

Protists in hypoxic waters of Jinhae Bay and Masan Bay, Korea, based on metabarcoding analyses: emphasizing surviving dinoflagellates

Density-dependent inhibition among four major dinoflagellate species causing red tides in Korean waters

Interactions between the calanoid copepod Acartia hongi and the bloom-forming dinoflagellates Karenia bicuneiformis and K. selliformis

Contact Info

Product

Resources

About