Tracing Different Freshwater Sources for Nutrients and Dissolved Organic Matter in Coastal Waters off Jeju Island Using Radon

Kwon, Hyeong Kyu; Seo, Junhyeong; Cho, Hyung‐Mi; Kim, Guebuem

doi:10.1007/s12237-018-0471-y

Cited by 11 publications

(6 citation statements)

References 38 publications

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“…3 ), though the distribution pattern of FDOM M was generally similar to that of FDOM C 22 , 48 , 65 . FDOM M can be produced either by bacterial activities 65 or phytoplankton 63 and also can be taken up by bacteria 66 . In general, the consumption rates of FDOM M by bacteria are approximately 2-fold higher than the production rates by phytoplankton 66 .…”

Section: Discussionmentioning

confidence: 81%

“…In contrast, there was no significant difference in the concentrations of FDOM M between the patch and non-patch areas (Fig. 3 ), though the distribution pattern of FDOM M was generally similar to that of FDOM C 22 , 48 , 65 . FDOM M can be produced either by bacterial activities 65 or phytoplankton 63 and also can be taken up by bacteria 66 .…”

Section: Discussionmentioning

confidence: 88%

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Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

Park

Kim

Kwon

et al. 2022

Sci Rep

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We measured the concentrations of dissolved inorganic and organic nutrients, dissolved organic carbon (DOC), total hydrolyzable amino acids (THAA), fluorescent dissolved organic matter (FDOM), phytoplankton pigments, and δ13C-DOC during the summer of 2019 in the harmful dinoflagellate bloom regions of the southern coast of Korea. In the harmful dinoflagellate bloom region, the concentrations of inorganic nitrogen were depleted, inhibiting the growth of diatoms, while the concentrations of dissolved organic components (nutrients, DOC, FDOM, and amino acids) which fuel dinoflagellates were unusually high. Thus, we attempted to investigate the origins and characteristics of DOM which fuels the harmful dinoflagellate blooms. The δ13C-DOC values (− 22.2‰ to − 18.2‰) indicate that the elevated DOC concentrations result from in-situ biological production rather than terrestrial inputs. The enantiomeric (D/L) ratios of THAA indicate that dissolved organic nitrogen was more labile in the early stage of harmful dinoflagellate bloom and became more refractory in the final stage. Our results suggest that the marine production of bioavailable DOM plays an important role in initiating and sustaining harmful dinoflagellate blooms.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 88%

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

Park

Kim

Kwon

et al. 2022

Sci Rep

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“…Therefore, during summer, environmental heterogeneity around the island is further reduced as CDW adds fresh, warm, oligotrophic water to the TWC-dominated coastal surface waters. Moreover, increased precipitation during the summer monsoon season further homogenizes surface water properties around the island (Kwon et al, 2020). In winter, however, the weakened TWC only reaches the south of Jeju Island, increasing the SST by up to 2°C at BM compared to SS and SH.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the consistent supply of oligotrophic TWC waters may soften direct impacts of the sewage treatment plant. As high nutrient concentrations can benefit corals' competitors and hinder coral physiological processes (Harriott and Banks, 2002;Manzello et al, 2014;Kwon et al, 2020), more oligotrophic conditions could favor the thriving of hard coral species at BM. Moreover, this low-energy habitat and the influence of the TWC lead to significantly higher winter SST and transparency readings.…”

Section: Discussionmentioning

confidence: 99%

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Perrois,

Jöst,

Lee

et al. 2024

Front. Mar. Sci.

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Aim of studyMarine climatic transition zones are boundary areas of major climate zones, here the boundary between the subtropical and temperate zones. They present areas containing high abundance of organisms living at the limit of their physiological tolerance. These marginal populations are particularly sensitive to changes in their environment. As such, marine climatic transition zones are excellent natural playgrounds for climate change-related hypothesis testing, especially with respect to marine habitat response to ocean warming. The marginal biogenic habitats around Jeju Island, South Korea, which lies within the temperate transition zone, have gradually changed from macroalgal-dominated to hard coral-dominated habitats. Understanding the specific abiotic environmental factors that influence the distribution of the marginal populations in temperate transition zones (i.e., species at their occurrence limit) is crucial to predicting and managing temperate zone habitat changes caused by climate change. This study aims to identify the specific abiotic environmental factors that contribute to explaining the current spatial distribution of the declining temperate and expanding subtropical foundation species in Jeju waters.MethodsCoverage and composition of sessile benthic communities were determined by photo-quadrat analysis at two depths (10 m and 15 m) at three sites along the island’s south, east, and north coasts in May and November 2022. Divergences in community composition between sites were characterized in light of ten quantitative environmental parameters.ResultsOur results show that sessile foundation communities vary significantly at different sites around the island. While the south is defined by high-latitude hard corals, predominately Alveopora japonica, the east is defined by the temperate canopy-forming macroalga Ecklonia cava, and the north is characterized by coralline algae. Winter sea surface temperature, water transparency, nutrient concentration, and water movement were statistically the most impactful environmental factors determining which foundation species constitute each distinct benthic community.ConclusionThis study provides valuable baseline information on the impacts of abiotic environmental factors on marine sessile communities in a temperate transition zone.

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“…recruitment and proliferation of A. japonica in certain locations around Jeju Island. One of the factors might be the nutrient enrichment along the coast due to the presence of the land-based fish farms and the influence of the Tsushima current [47][48][49][50][51][52][53] and groundwater discharges [50,[54][55][56][57][58].…”

Section: Plos Onementioning

confidence: 99%

Dominance of the scleractinian coral Alveopora japonica in the barren subtidal hard bottom of high-latitude Jeju Island off the south coast of Korea assessed by high-resolution underwater images

Lee

Subramaniam

et al. 2022

PLoS ONE

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Coastal benthic communities in temperate regions have been influenced by climate change, including increasing sea-surface temperature. Nevertheless, scleractinian coral Alveopora japonica Eguchi, 1968, is thriving in shallow subtidal hard bottoms around Jeju Island, off the southern coast of Korea. The presence of this corals has negatively impacted subtidal kelp populations in Jeju Island. However, there is no study to document how the presence or absence of this coral relates to other benthic communities. This study investigated the benthos in three shallow subtidal sites (Shinheung (SH), Bukchon (BC), and Seongsan (SS)) in northern Jeju using underwater photography. Macro-benthic organisms appearing on a 1 × 20 m line transect installed at depths of 5, 10, and 15 m at each site were analyzed. Results showed that of the three sites investigated, A. japonica colonies were most abundant at BC, accounting for 45.9% and 72.8% of the total transect area at 10 m and 15 m, respectively. At SS, A. japonica occupied 15.3% of the total area at 15 m and less than 1% at 5 m and 10 m. The same at SH accounted for 10% of the total area at 5 m, and less than 1% at 10 m and 15 m. Dead and bleached colonies accounted for 1.2–11.5% and 1.8–5.7%, respectively, at 5, 10, and 15 m at three sites. At SS, canopy-forming brown algae Ecklonia cava and Sargassum spp. accounted for 20.2 and 24.3% of the total transect area, respectively, at 5 m depth. In contrast, the percent cover of E. cava and Sargassum spp. at SH and BC ranged from 0.1 to 1.8%, respectively. Moreover, non-geniculate coralline algae dominated the subtidal substrate at SH, ranging between 60.2 and 69% at 15 and 10 m. The low cover of A. japonica in SS (at 5 m) coincided with a high percent cover of canopy-forming brown algae. However, canopy-forming brown algae were rare at all depths at SH and BC and were dominated instead by coralline algae and the scleractinian corals. This study, by utilizing a non-destructive method, provides a baseline qualitative and quantitative information for understanding the site and depth-dependent distribution of A. japonica and algal populations, which is important to understand climate change related changes in benthic communities in Jeju and elsewhere.

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Tracing Different Freshwater Sources for Nutrients and Dissolved Organic Matter in Coastal Waters off Jeju Island Using Radon

Cited by 11 publications

References 38 publications

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and d/l-Amino acid compositions

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Dominance of the scleractinian coral Alveopora japonica in the barren subtidal hard bottom of high-latitude Jeju Island off the south coast of Korea assessed by high-resolution underwater images

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