Seasonal production of dinoflagellate cysts in relation to environmental characteristics in Jinhae-Masan Bay, Korea: One-year sediment trap observation

Shin, Hyeon Ho; Li, Zhun; Lim, Dhongil; Lee, Kyun-Woo; Seo, Min Ho; Lim, Weol Ae

doi:10.1016/j.ecss.2018.09.031

Cited by 14 publications

(4 citation statements)

References 54 publications

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“…Many sediment trap studies showed that cyst production is enhanced with enhanced nutrient availability in surface waters (e.g. Sin et al, 2018;Bringué et al, 2019). The observation of higher cyst export fluxes in summer (this study) compared to the winter situation (2018) might, therefore, be a consequence of different source waters of the waters of the upwelling cell sampled during boreal summer compared to boreal winter.…”

Section: Drifting Trap Surveysmentioning

confidence: 58%

Dinoflagellate cysts production, excystment and transport in the upwelling off Cape Blanc (NW Africa)

2022

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To extend the understanding of dinoflagellate cysts production, excystment and vertical/lateral transport in the water column, we compared upper water cyst export production with cysts associations and concentrations in the subsurface nepheloid layer, bottom nepheloid layer and deeper water column during active upwelling off Cape Blanc (NW Africa) in August 2020. Export production was collected by two drifting trap surveys; DTS1 in an active upwelling cell for 4 days and DTS2 in an offshore drifting upwelling filament for 2 days. Subsurface, bottom nepheloid layers and deeper waters were sampled by in-situ pumps along two transects perpendicular to the shelf break. During DTS1, light limitation hampered phytoplankton production which might have influenced cyst production negatively due to up- and downward movement of water masses. Cyst export production increased at the rim of the upwelling cell. For DTS2, upwelling filament cyst export production was up to 3 times lower than that of DTS1. Echinidinium delicatum had highest relative and absolute abundances in the active upwelling, Echinidinium zonneveldiae and Bitectatodinium spongium in the upwelling filament, and Impagidinium spp. and cysts of Gymnodinium microreticulatum/nolleri at the most distal stations. Comparison of concentrations of cysts with and without cell contents showed that the majority of cysts hatched before reaching deeper waters and displayed a dormancy period of less than 6 days. About 5% of the living cysts reached deeper waters and/or the ocean floor. Living cysts were transported offshore in the upwelling filament. In case ships exchange ballast waters in the studied region, they will take up laterally transported living cysts. Upon release of the ballast waters in the port of arrival, these cysts have the potential to become “invader species” that can threaten economy and/or health. Lateral transport of cysts was observed in the bottom nepheloid layer and in deeper waters (800 - 1200m depth) with a maximal extension of about 130km off the shelf break. Therefore, sediments in the region will contain a mixture of regionally and locally produced dinoflagellate cysts. This insight contributes to the improvement of environmental reconstructions of the Cape blanc upwelling system based on downcore cyst associations.

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Section: Drifting Trap Surveysmentioning

confidence: 58%

Dinoflagellate cysts production, excystment and transport in the upwelling off Cape Blanc (NW Africa)

2022

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“…The dominant factor is most likely germination and vertical migration into the water column given the more suitable temperature and radiation [20]. Furthermore, rainfall increases during late spring and early summer; the nutrition brought in by runoff stimulates the algal recruitment, growth, and even the blooms [49].…”

Section: Variations In Phytoplankton Communities In Sedimentmentioning

confidence: 99%

“…However, Bacillariophyta and Chlorophyta cannot vertically migrate and prefer moderate flow velocity and turbulence [52], so they could not become the dominant species in surface water under stable thermal stratification conditions. Dinoflagellate prefers to grow at 10-20 • C [49], so dinoflagellate blooms occur more frequently below 20 • C. However, the cyanobacteria Microcystis sp. likes the temperature to be between 20 and 35 • C and prefers a low concentration ratio of nitrogen and phosphorus of about 10 [56].…”

Section: The Factor Influencing Species In Surface Water During Algal Bloomsmentioning

confidence: 99%

Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China

Ouyang

Yang

et al. 2021

Water

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The resting stages of phytoplankton are usually regarded as the seed bank and source of harmful algal blooms because of the recruitment of phytoplankton from sediment to the water column under suitable environmental conditions. Information about resting stages of phytoplankton is abundant in shallow lakes and littoral sea; yet, studies on river–reservoir systems are rare. The river–reservoir continuum shows a unique structuring of longitudinal gradients of hydrological and hydrodynamic conditions. We hypothesized that the seed bank and algal blooms in reservoirs are influenced by the hydrodynamic conditions of each reservoir. We used Illumina Miseq sequencing to examine the spatio-temporal variation in the phytoplankton community in the sediment as reservoir drawdown and in surface water during algal blooms in Pengxi River, a tributary of China’s Three Gorges Reservoir. The results show that the cyanobacteria community in sediment is significantly influenced by temperature, total carbon, maximum flow velocity, and total phosphorous, the eukaryotic phytoplankton community in sediment is significantly influenced by total phosphorous, temperature, total carbon, maximum flow velocity, and total nitrogen. Additionally, the dominant species in sediment is significantly different from that in surface water during algal blooms. Our results suggest that the dominant species in surface water during algal blooms is more influenced by the environmental factors and hydrodynamic conditions in the water column than the seeds in the sediment. These findings are fundamental for further research on the influence of hydrodynamic conditions on algal blooms in artificially regulated river-reservoir systems.

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“…A study from southwest Taiwan waters in the South China Sea, which is influenced by both the winter (March-April) and summer (July-August) East Asian monsoons, showed increases in the fluxes of almost all taxa in July-August, reflecting increased river and nutrient input during the summer monsoon (Li et al 2018). In two embayments along the southern coast of South Korea, phototrophic cyst production was also found to be mostly restricted to the warmest months (July-September) and the fall (Shin et al 2012(Shin et al , 2018. Within the water column, motile cells of Gonyaulax spinifera, which produce cysts assignable to the cyst-defined genus Spiniferites, were found to be largely restricted to the months of March-August based on a 5-year survey in the Yellow Sea of China (Liu et al 2017).…”

Section: Introductionmentioning

confidence: 97%

Paleoceanography and dinoflagellate cyst stratigraphy across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the Chiba composite section, Japan

Balota

Head

Okada

et al. 2021

Prog Earth Planet Sci

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A dinoflagellate cyst record from the highly resolved Chiba composite section in Japan has been used to reconstruct sea-surface paleoceanographic changes across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the global stratotype, constituting the first detailed study of this microfossil group from the Pleistocene of the Japanese Pacific margin. Cold, subarctic water masses from 794.2 ka gave way to warming and rapid retreat of the Subpolar Front at 789.3 ka, ~ 2000 years before the end of Marine Isotope Stage (MIS) 20. Throughout the fully interglacial conditions of MIS 19c, assemblages are consistent with warm sea surface temperatures but also reveal instability and latitudinal shifts in the Kuroshio Extension system. The abrupt dominance of Protoceratium reticulatum cysts between 772.9 and 770.4 ka (MIS 19b) registers the influence of cooler, mixed, nutrient-rich waters of the Kuroshio–Oyashio Interfrontal Zone resulting from a southward shift of the Kuroshio Extension. Its onset at 772.9 ka serves as a local ecostratigraphic marker for the Chibanian Stage Global Boundary Stratotype Section and Point (GSSP) which occurs just 1.15 m (= 1300 years) below it. An interval from 770.1 ka to the top of the examined succession at 765.8 ka (MIS 19a) represents warm, presumably stratified but still nutrient-elevated surface waters, indicating a northward shift of the Kuroshio Extension ~ 5 kyrs after the termination of full interglacial conditions on land.

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Seasonal production of dinoflagellate cysts in relation to environmental characteristics in Jinhae-Masan Bay, Korea: One-year sediment trap observation

Cited by 14 publications

References 54 publications

Dinoflagellate cysts production, excystment and transport in the upwelling off Cape Blanc (NW Africa)

Dinoflagellate cysts production, excystment and transport in the upwelling off Cape Blanc (NW Africa)

Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China

Paleoceanography and dinoflagellate cyst stratigraphy across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the Chiba composite section, Japan

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