Behavior of Cu, Ni and Cd during nutrient depletion in a spring bloom in Funka Bay

1998 ◽  
Vol 54 (6) ◽  
pp. 619-627 ◽  
Author(s):  
Isao Kudo ◽  
Katsuhiko Matsunaga
Keyword(s):  
Spring Bloom ◽  
Nutrient Depletion ◽  
Funka Bay

Behavior and dynamic balance of manganese during spring bloom in Funka Bay, Japan

1992 ◽  
Vol 40 (3-4) ◽  
pp. 273-289 ◽  
Author(s):  
Isao Kudo ◽  
Tomoyuki Ohyama ◽  
Shigeto Nakabayashi ◽  
Kenshi Kuma ◽  
Katsuhiko Matsunaga
Keyword(s):  
Spring Bloom ◽  
Dynamic Balance ◽  
Funka Bay

Modeling of the spring bloom in Funka Bay, Japan

2001 ◽  
Vol 21 (5) ◽  
pp. 473-494 ◽  
Author(s):  
Tomonori Azumaya ◽  
Yutaka Isoda ◽  
Shinichiro Noriki
Keyword(s):  
Spring Bloom ◽  
Funka Bay

The dynamics of organic production in the Rockall Channel area

1986 ◽  
Vol 88 ◽  
pp. 207-220
Author(s):  
B. Zeitzschel
Keyword(s):  
Spring Bloom ◽  
Standing Stock ◽  
Euphotic Zone ◽  
Organic Production ◽  
Substantial Part ◽  
Cell Aggregates ◽  
Nutrient Depletion ◽  
New Production ◽  
Faecal Pellets ◽  
The Stability

SynopsisFor the onset of the phytoplankton spring bloom in temperate waters, the irradiance, the concentration of accumulated nutrients and the stability of the water column are of great importance. The “new” production in spring is produced mainly by chain forming diatoms.The dissipation of the spring bloom is due to nutrient depletion in the stabilised surface layer, loss of cells by sinking and grazing by herbivorous zooplankton. After the nutrient concentration is lowered, the rate of production will depend primarily on the rate of replenishment of nutrients. In open ocean environments we find “regenerated production” which is due to exudated and excreted nutrient salts e.g. ammonium. The dominating group of phytoplankters are small flagellates. It is argued that a substantial part of the phytoplankton standing stock in spring is lost from the euphotic zone due to direct sinking of cells or accelerated sinking of cell-aggregates. It is postulated that faecal pellets of micro- and mesozooplankton are retained and recycled in the mixed layer, whereas macrozooplankton faecal strings transport a considerable amount of organic matter to the benthal.

scholarly journals Tidal impacts on primary production in the North Sea

2018 ◽  
Author(s):  
Changjin Zhao ◽  
Ute Daewel ◽  
Corinna Schrum
Keyword(s):  
Primary Production ◽  
North Sea ◽  
Tidal Cycle ◽  
Spring Bloom ◽  
Tidal Mixing ◽  
Nutrient Depletion ◽  
Tidal Forcing ◽  
The North ◽  
Shelf Seas ◽  
The North Sea

Abstract. This study highlights the importance of tides in controlling the spatial and temporal distributions of phytoplankton and other factors related to growth, such as nutrients and light availability. To quantify the responses of net primary production (NPP) to tidal forcing, we conducted scenario model simulations considering M2 and S2 tidal constituents using the physical-biogeochemical coupled model ECOSMO. The results were analysed with respect to a reference simulation without tidal forcing, with particular focus on the spatial scale of the tidally induced changes. Tidal forcing regulates the mixing-stratification processes in shelf seas such as the North Sea and hence also influences ecosystem dynamics. In principle, the results suggest three different response types with respect to primary production: (i) in southern shallow areas with strong tidal energy dissipation, tidal mixing dilutes phytoplankton concentrations in the upper water layers and thereby decreases NPP. Additionally, tides increase turbidity in near-coastal shallow areas, which has the potential to further hamper NPP. (ii) In the frontal region of the southern North Sea, which is a transition zone between stratified and mixed areas, tidal mixing infuses nutrients into the surface mixed layer and resolves summer nutrient depletion, thus sustaining the NPP during the summer season after spring bloom nutrient depletion. (iii) In the northern North Sea, the NPP response to tidal forcing is limited. Additionally, our simulations indicate that spring bloom phenology is impacted by tidal forcing, leading to a later onset of the spring bloom in large parts of the North Sea and to generally higher spring bloom peak phytoplankton biomasses. By testing the related changes in stratification, light conditions and grazing pressure, we found that all three factors potentially contribute to the change in spring bloom phenology with clear local differences. Finally, we also analysed the impact of the spring-neap tidal cycle on NPP. The annual mean impact of spring-neap tidal forcing on NPP is limited. However, locally, we found substantial differences in NPP either in-phase or anti-phase with the spring-neap tidal cycle. These differences could be attributed to locally different dominant factors such as light or nutrient availability during spring tides. In general, we conclude that in shallow shelf seas such as the North Sea, intensified vertical mixing induced by tidal forcing could either promote NPP by counteracting nutrient depletion or hinder NPP by deteriorating the light environment because of the resuspension and mixing of suspended matter into the euphotic zone.

scholarly journals Nutrient consumption by diatoms in the dark subsurface layer of Funka Bay, Hokkaido, Japan

2022 ◽  
Author(s):  
Sachi Umezawa ◽  
Manami Tozawa ◽  
Yuichi Nosaka ◽  
Daiki Nomura ◽  
Hiroji Onishi ◽  
...  
Keyword(s):  
Surface Waters ◽  
Spring Bloom ◽  
Subsurface Layer ◽  
Observational Evidence ◽  
Surface Mixed Layer ◽  
Substantial Influence ◽  
Nutrient Reduction ◽  
Funka Bay ◽  
Incubation Experiments ◽  
Nutrient Consumption

Abstract. We conducted time-series observations in Funka Bay, Hokkaido, Japan, from 15 February to 14 April 2019. The diatom spring bloom peaked on 4 March and started declining on 15 March. Funka Bay winter water remained below 30-m depth, which was below the surface mixed-layer and dark-zone depths on both dates. At depths of 30–50 m, concentrations of NO3–, PO43–, and Si(OH)4 decreased by half between these dates even in darkness. Incubation experiments using the diatom Thalassiosira nordenskioeldii showed that this diatom could consume nutrients in darkness at substantial rates. We conclude that the nutrient reduction in the subsurface layer (30–50 m) could be explained by dark consumption by diatoms that had been growing in the surface waters and then sank to the subsurface layer. We believe that this is the first study to present observational evidence for the consumption of the main nutrients by diatoms in the dark subsurface layer during the spring bloom. Nutrient consumption in this layer might have a substantial influence on the primary production during and after the spring bloom.

scholarly journals Tidal impacts on primary production in the North Sea

2019 ◽  
Vol 10 (2) ◽  
pp. 287-317 ◽  
Author(s):  
Changjin Zhao ◽  
Ute Daewel ◽  
Corinna Schrum
Keyword(s):  
Primary Production ◽  
North Sea ◽  
Tidal Cycle ◽  
Spring Bloom ◽  
Tidal Mixing ◽  
Nutrient Depletion ◽  
Tidal Forcing ◽  
The North ◽  
Shelf Seas ◽  
The North Sea

Abstract. This study highlights the importance of tides in controlling the spatial and temporal distributions of phytoplankton and other factors related to growth, such as nutrients and light availability. To quantify the responses of net primary production (NPP) to tidal forcing, we conducted scenario model simulations considering M2 and S2 tidal constituents using the physical–biogeochemical coupled model ECOSMO (ECOSystem MOdel). The results were analyzed with respect to a reference simulation without tidal forcing, with particular focus on the spatial scale of the tidally induced changes. Tidal forcing regulates the mixing–stratification processes in shelf seas such as the North Sea and hence also influences ecosystem dynamics. In principle, the results suggest three different response types with respect to primary production: (i) in southern shallow areas with strong tidal energy dissipation, tidal mixing dilutes phytoplankton concentrations in the upper water layers and thereby decreases NPP. Additionally, tides increase turbidity in near-coastal shallow areas, which has the potential to further hamper NPP. (ii) In the frontal region of the southern North Sea, which is a transition zone between stratified and mixed areas, tidal mixing infuses nutrients into the surface mixed layer and resolves summer nutrient depletion, thus sustaining the NPP during the summer season after spring bloom nutrient depletion. (iii) In the northern North Sea, the NPP response to tidal forcing is limited. Additionally, our simulations indicate that spring bloom phenology is impacted by tidal forcing, leading to a later onset of the spring bloom in large parts of the North Sea and to generally higher spring bloom peak phytoplankton biomasses. By testing the related changes in stratification, light conditions and grazing pressure, we found that all three factors potentially contribute to the change in spring bloom phenology with clear local differences. Finally, we also analyzed the impact of the spring–neap tidal cycle on NPP. The annual mean impact of spring–neap tidal forcing on NPP is limited. However, locally, we found substantial differences in NPP either in phase or anti-phase with the spring–neap tidal cycle. These differences could be attributed to locally different dominant factors such as light or nutrient availability during spring tides. In general, we conclude that in shallow shelf seas such as the North Sea, intensified vertical mixing induced by tidal forcing could either promote NPP by counteracting nutrient depletion or hinder NPP by deteriorating the light environment because of the resuspension and mixing of suspended matter into the euphotic zone.

Nutrient regeneration at bottom after a massive spring bloom in a subarctic coastal environment, Funka Bay, Japan

2007 ◽  
Vol 63 (5) ◽  
pp. 791-801 ◽  
Author(s):  
Isao Kudo ◽  
Takeshi Yoshimura ◽  
Choon-Weng Lee ◽  
Mitsuru Yanada ◽  
Yoshiaki Maita
Keyword(s):  
Spring Bloom ◽  
Coastal Environment ◽  
Nutrient Regeneration ◽  
Funka Bay

TOR and MAP kinase pathways synergistically regulate autophagy in response to nutrient depletion in fission yeast

Autophagy ◽  
2021 ◽  
pp. 1-16
Author(s):  
Cristina Corral-Ramos ◽  
Rubén Barrios ◽  
José Ayté ◽  
Elena Hidalgo
Keyword(s):  
Map Kinase ◽  
Fission Yeast ◽  
Nutrient Depletion ◽  
Map Kinase Pathways

scholarly journals Regulation of the Phytoplankton Heme b Iron Pool During the North Atlantic Spring Bloom

2019 ◽  
Vol 10 ◽  
Author(s):  
Evangelia Louropoulou ◽  
Martha Gledhill ◽  
Thomas J. Browning ◽  
Dhwani K. Desai ◽  
Jan-Lukas Menzel Barraqueta ◽  
...  
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
The North ◽  
The North Atlantic ◽  
Iron Pool
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