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
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 d...
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2021
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ftdoajarticles:oai:doaj.org/article:cec4ebf62f5e499d8d223fa9e6e860a7 2023-05-15T18:28:36+02:00 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 Tomonori Isada Hiroya Abe Hiromi Kasai Masahiro Nakaoka 2021-10-01T00:00:00Z https://doi.org/10.3389/fmars.2021.711832 https://doaj.org/article/cec4ebf62f5e499d8d223fa9e6e860a7 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.711832/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.711832 https://doaj.org/article/cec4ebf62f5e499d8d223fa9e6e860a7 Frontiers in Marine Science, Vol 8 (2021) colored dissolved organic matter (CDOM) inherent optical properties (IOPs) Secchi disk wetland seagrass mariculture Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.711832 2022-12-31T04:34:25Z 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 ... Article in Journal/Newspaper Subarctic Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
colored dissolved organic matter (CDOM) inherent optical properties (IOPs) Secchi disk wetland seagrass mariculture Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
colored dissolved organic matter (CDOM) inherent optical properties (IOPs) Secchi disk wetland seagrass mariculture Science Q General. Including nature conservation geographical distribution QH1-199.5 Tomonori Isada Hiroya Abe Hiromi Kasai Masahiro Nakaoka 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 |
topic_facet |
colored dissolved organic matter (CDOM) inherent optical properties (IOPs) Secchi disk wetland seagrass mariculture Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Tomonori Isada Hiroya Abe Hiromi Kasai Masahiro Nakaoka |
author_facet |
Tomonori Isada Hiroya Abe Hiromi Kasai Masahiro Nakaoka |
author_sort |
Tomonori Isada |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.711832 https://doaj.org/article/cec4ebf62f5e499d8d223fa9e6e860a7 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.711832/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.711832 https://doaj.org/article/cec4ebf62f5e499d8d223fa9e6e860a7 |
op_doi |
https://doi.org/10.3389/fmars.2021.711832 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1766211135573327872 |