Dataset Information

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ¹³C and D/L-Amino acid compositions.

ABSTRACT: 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.

SUBMITTER: Park J

PROVIDER: S-EPMC9445177 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ<sup>13</sup>C and D/L-Amino acid compositions.

Park Jihyun J Kim Guebuem G Kwon Hyeong Kyu HK Han Heejun H Park Tae Gyu TG Son Moonho M

Scientific reports 20220905 1

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 δ<sup>13</sup>C-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 concentration ...[more]

PMID: 36064561

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Project description:Harmful algal blooms (HABs) and their consequences cause multiple devastating effects in various freshwater, brackish and marine ecosystems. However, HAB species at moderate population densities have positive ecological roles as primary producers of organic matter and food for zooplankton and fish. They also enhance benthic-pelagic coupling and participate in the biogeochemical cycles. The consequences of HABs are transported across the conventional environmental boundaries by numerous cascade effects in the food webs and beyond. Meanwhile, forecasts of bloom events are still limited, largely because of scarcity of reliable information on ecological niches of the bloom-forming algae. To fill up this knowledge gap, this study focused on dinoflagellates, a diverse group of mostly photosynthesizing protists (unicellular eukaryotes) capable of mixotrophy, since they play a key role in primary production and formation of blooms in marine and brackish waters worldwide. In this study, ecological niches of 17 abundant bloom-forming dinoflagellate species from coastal regions of the southern Baltic Sea were identified for the first time. It was hypothesized that wider ecological niches ensure more frequent dinoflagellate blooms compared to the species with narrower niches. This hypothesis was verified using the long-term (44 years) database on phytoplankton abundance and physical-chemical characteristics of the environment. It were analyzed 4534 datasets collected from 1972 to 2016. Fourteen abiotic parameters (water temperature, salinity, Secchi depth, pH, Chl a, and concentration of basic nutrients) were considered as ecological niche dimensions. The Principal Component Analysis presented the dissolved inorganic nitrogen, total nitrogen, Chl a, and temperature as principal niche dimensions of dinoflagellates. The algal bloom criteria were refined. It was for the first time proved statistically that HAB frequency of dinoflagellate species robustly correlated with the width of their ecological niches.

Dataset Information

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ¹³C and D/L-Amino acid compositions.

Publications

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ<sup>13</sup>C and D/L-Amino acid compositions.

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Dataset Information

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ13C and D/L-Amino acid compositions.

Publications

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ<sup>13</sup>C and D/L-Amino acid compositions.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Origins and characteristics of dissolved organic matter fueling harmful dinoflagellate blooms revealed by δ¹³C and D/L-Amino acid compositions.