Temporal variability and characterization of physicochemical properties in the neritic area of Sagami Bay, Japan

Ara, Koichi; Hiromi, Juro

doi:10.1007/s10872-008-0015-3

Cited by 11 publications

(24 citation statements)

References 24 publications

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“…2-4, Ara & Hiromi 2008, Ara et al 2011a. However, when a Noctiluca red tide was formed at the surface on April 19, 2006, dissolved inorganic nutrient concentrations, except for Si(OH) 4 -Si, were extremely high in the uppermost layer (0-3 cm depth), as also found in the Inland Sea of Japan (Montani et al 1998, Pithakpol et al 2000a).…”

Section: Nhmentioning

confidence: 82%

“…In this case, the timing of both the high Noctiluca abundances and Chl-a concentrations could be explained by a mutually supportive relationship (e.g. Harris 1959, Dugdale & Goering 1967, Corner & Davis 1971 (Ara & Hiromi 2008, Ara et al 2011b, as well as nutrient supply by Noctiluca excretion also being high.…”

Section: Nhmentioning

confidence: 90%

“…1), and is geographically located in the transition zone where nutrient-rich estuarine water from neighboring Tokyo Bay, one of the most eutrophic semi-enclosed embayments in Japan, flows out to the Pacific Ocean. Although chemical oxygen demand (COD), dissolved inorganic nutrient and chlorophyll a (Chl-a) concentrations in Sagami Bay have maintained much lower levels than in neighboring Tokyo Bay (Saitou 1992, Ara & Hiromi 2008, Ara et al 2011b, since the 1980s some signs of eutrophication (i.e. gradual rise in COD and Chl-a concentration, decline in transparency, red tide outbreaks) have occurred, partly in the coastal waters of Sagami Bay (Yamada & Iwata 1992, Yamada 1997, Machida et al 1999, Yamada & Matsushita 2005, Miyaguchi et al 2006, Ara & Hiromi 2008, Ara et al 2011a).…”

Section: Introductionmentioning

confidence: 99%

“…Although chemical oxygen demand (COD), dissolved inorganic nutrient and chlorophyll a (Chl-a) concentrations in Sagami Bay have maintained much lower levels than in neighboring Tokyo Bay (Saitou 1992, Ara & Hiromi 2008, Ara et al 2011b, since the 1980s some signs of eutrophication (i.e. gradual rise in COD and Chl-a concentration, decline in transparency, red tide outbreaks) have occurred, partly in the coastal waters of Sagami Bay (Yamada & Iwata 1992, Yamada 1997, Machida et al 1999, Yamada & Matsushita 2005, Miyaguchi et al 2006, Ara & Hiromi 2008, Ara et al 2011a). The neritic waters in the innermost open area of Sagami Bay, especially the upper layer around Enoshima Island, have higher phytoplankton standing crops (Chl-a) and primary production than those in any other open area in the bay (Ara & Hiromi 2007, 2008, Ara et al 2011a.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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Abstract:The role of the heterotrophic dinoflagellate Noctiluca scintillans in affecting the nutrient-environment and aquatic ecosystem was investigated in the neritic area of Sagami Bay, Kanagawa, Japan, from January 2002 to December 2006, based on abundance, intracellular nutrient content, excretion rate and response of phytoplankton (diatoms) to enrichment of nutrients extracted from N. scintillans cells. Seasonal variations in abundance and vertical distribution of N. scintillans were significantly related to the physical structure of the water column, water temperature, chlorophyll a and primary productivity. Intracellular nutrient contents, except for Si(OH) 4 -Si, revealed clear seasonal fluctuations, which were significantly correlated to cell size variations. Thalassiosira rotula increased to higher cell abundances at higher concentrations of nutrients, which were extracted from N. scintillans cells. NH 4 + -N and PO 4 3--P excretion rates were much higher during the first 1-3 h, and decreased rapidly with time. Daily NH 4 + -N and PO 4 3--P supply by N. scintillans excretion was estimated to be on average 34.8% and 55.3%, especially 50.6-85.4% and 80.5-135.8% in April-July (monthly mean), of the daily N and P requirement for primary production, respectively. The large amounts of nutrients regenerated and released by N. scintillans excretion can increase the N and P concentrations in ambient seawater, especially in the upper layer in spring-summer, and consequently affect phytoplankton (diatom) abundance. These may exacerbate eutrophication in these waters by a mutually supportive relationship between phytoplankton and N. scintillans: bottom-up control (phytoplankton-N. scintillans) and nutrient supply by N. scintillans to phytoplankton through excretion.

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Section: Nhmentioning

confidence: 82%

Section: Nhmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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“…In this study, we assessed the combinations of elements that may serve as potential factors affecting the growth of protistan microplankton. Dinoflagellates normally bloom during the summer (Ara & Hiromi 2008, Ara et al 2011, and they are widely known to be more common in warmer rather than colder environments. Indeed, dinoflagellates were found to be more abundant at S09 with a higher surface water temperature (Table 3).…”

Section: Protistan Microplankton Community With Surface Ecological Vamentioning

confidence: 99%

The protistan microplankton community along the Kuroshio Current revealed by 18S rRNA gene clone analysis: a case study of the differences in distribution interplay with ecological variability

Kok

Tsuchiya

Komatsu

et al. 2014

Plankton Benthos Res

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Abstract:The distribution of protistan microplankton situated southwest (S09) and northeast (S18) of the Izu Ridge along the Kuroshio Current was revealed by 18S rRNA gene clone analysis. A total of 257 clones were identified, consisting of 65 phylotypes of dinoflagellates, 49 phylotypes of diatoms and 57 phylotypes of other protists affiliated with Ciliophora, Cryptophyta, Cryptophyta nucleomorph, Choanoflagellata, Chlorophyta, Cercozoa, and Heterokonta. The dinoflagellate phylotypes were affiliated with five genera and 14 uncultured groups, with Gyrodinium as the most frequently detected genus. The diatoms were also well represented and consisted of 13 genera and six uncultured groups. The clones belonging to the genus Pseudo-nitzschia were most frequently detected. The frequencies of dinoflagellate clones and phylotypes were higher at station S09 in the south than at station S18 to the north, with the frequency of diatom phylotypes being higher at the latter. The species richness (number of phylotypes) and diversity (Shannon-Wiener) of the protistan microplankton community were slightly higher at S18 compared to S09. When the Kuroshio Current encountered with the Oyashio Current at northwestern Pacific, it affects the water temperature and nutrients of the Kuroshio Current. The clone analysis results showed a difference in the protistan microplankton community at both stations due to the collision of both currents.

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Seasonal variability in plankton food web structure and trophodynamics in the neritic area of Sagami Bay, Japan

Ara

Hiromi

2009

J Oceanogr

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Temporal variability and characterization of physicochemical properties in the neritic area of Sagami Bay, Japan

Cited by 11 publications

References 24 publications

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

The protistan microplankton community along the Kuroshio Current revealed by 18S rRNA gene clone analysis: a case study of the differences in distribution interplay with ecological variability

Seasonal variability in plankton food web structure and trophodynamics in the neritic area of Sagami Bay, Japan

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