Production of chromophoric dissolved organic matter by seagrasses in brackish aquaculture water

Tanaka, Yasuaki; Bahrin, Aina; Lamit, Nadhirah

doi:10.1111/are.14033

Cited by 2 publications

(2 citation statements)

References 21 publications

(29 reference statements)

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“…Changes in the slope parameters of CDOM in AKE were also distinct from those in AB (Figure 6), suggesting different mixing processes inside and outside AKE, as well as other potential inputs from mariculture and eelgrass meadows within AKE. Some studies have shown the importance of seagrass meadows as a DOM and CDOM source in water columns (Ziegler and Benner, 1999a;Stabenau et al, 2004;Tanaka et al, 2019). Based on the analysis of DOC-specific UV absorbance at 254 nm (SUVA 254 ) and the fluorescence excitation-emission matrix spectroscopy coupled with parallel factor analysis (EEM-PARAFAC) of DOM, Maie et al (2014) showed the conservative behavior of SUVA 254 in a salinity range of less than 10 in the mouth of the Bekanbeushi River.…”

Section: Influence Of River Discharge Mariculture and Eelgrass Meadows On The Colored Dissolved Organic Matter Cyclementioning

confidence: 99%

“…Maie et al (2014) conducted snapshot observations of the DOC concentration and optical properties of CDOM at the mouth of AKE along the lower salinity range (salinity < 10) during summer, and suggested plankton and/or submerged aquatic vegetation as additional sources besides terrestrial inputs. Moreover, recent studies have shown the contribution of aquaculture as a source of CDOM in the water column (Zhang et al, 2018;Tanaka et al, 2019). Therefore, eelgrass meadows and mariculture in AKE may provide key CDOM cycles in the Akkeshi watershed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows

et al. 2021

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Coastal oceans interacting with terrestrial ecosystems play an important role in biogeochemical cycles. It is therefore essential to research land–ocean interactions for further understanding of the processes influencing nutrients dynamics in coastal areas. We investigated the seasonal and spatial distribution of nutrient concentrations and light absorption coefficients of colored dissolved organic matter (CDOM), non-algal particles (NAP), and phytoplankton in a wetland-influenced river–eelgrass meadows–coastal waters continuum in the protected and semi-enclosed coastal sea of Akkeshi-ko estuary (AKE) and Akkeshi Bay (AB), Japan from April 2014 to February 2015. The mixing dilution lines of the CDOM absorption coefficient at 355 nm [aCDOM(355)] relative to salinity predicted by two end-members between freshwater and coastal water showed conservative mixing in AB. Silicate concentrations were significantly correlated with salinity and aCDOM(355) in AB in each month except for December 2014. These results suggest that silicate and CDOM in AB primarily originates from wetland-influenced river discharge. However, samples collected from the eelgrass meadows of AKE, where mariculture is developed, showed non-conservative mixing of silicate concentrations and aCDOM(355) with salinity except for June 2014. Elevated phosphate concentrations, probably released from sediments, were also found in the eelgrass meadows of AKE, especially during summer. These results suggest that the metabolic activities of mariculture and seagrass ecosystem significantly contribute to the nutrient cycles and CDOM absorption in AKE and to the distinct water-mass systems inside and outside AKE. The relative absorption properties of NAP [aNAP(443)], phytoplankton [aph(443)], and aCDOM(443) showed that CDOM is the main factor affecting the light distribution in AKE. However, the relative absorption properties varied seasonally in AB because of spring and autumn phytoplankton blooms and ice cover during winter. Significant relationships were observed between the Secchi disk depth (ZSD), aNAP(443), and aCDOM(443). Chl a concentration and aph(443) were not good indicators for predicting ZSD in our study region. These results suggest that incorporating inherent optical properties and CDOM from mariculture and seagrass ecosystem into ecosystem models could improve predictions of light distribution along the freshwater–eelgrass–coastal waters continuum in optically complex coastal waters.

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Section: Influence Of River Discharge Mariculture and Eelgrass Meadows On The Colored Dissolved Organic Matter Cyclementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows

et al. 2021

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Bioremediation potential of tropical seaweeds in aquaculture: low-salinity tolerance, phosphorus content, and production of UV-absorbing compounds

et al. 2020

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Production of chromophoric dissolved organic matter by seagrasses in brackish aquaculture water

Cited by 2 publications

References 21 publications

Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows

Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows

Bioremediation potential of tropical seaweeds in aquaculture: low-salinity tolerance, phosphorus content, and production of UV-absorbing compounds

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