Contribution of benthic and epiphytic diatoms to clam and oyster production in the Akkeshi-ko estuary

Kasim, Ma'ruf; Mukai, Hiroshi

doi:10.1007/s10872-006-0051-9

Cited by 86 publications

(68 citation statements)

References 37 publications

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“…Consequently, SMPB comprised ∼10 and 20% of the total cell abundances in the surface and bottom waters, respectively. This value is consistent with that reported for other temperate estuaries, e.g., Westershelde Estuary (15-42%, Lucas et al 2001) and Akkeshi-ko Estuary (<50%, Kasim & Mukai 2006).…”

Section: Horizontal and Vertical Distribution Patterns Of Suspended Msupporting

confidence: 92%

“…This is because of their significant production comparable to that of PPL (Cahoon & Cooke 1992, Gillespie et al 2000 and their suspension in the water column as SMPB. SMPB reportedly can comprise between 15-42% and <50% of the depth-integrated total cell abundance (Lucas et al 2001, Kasim & Mukai 2006, <60% of the depth-integrated chlorophyll a (Chl.a) (De Jonge & Van Beusekom 1992), and 48% of the depth-integrated particulate organic carbon (POC) (Suga et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Tsuji

Montani

2017

Plankton Benthos Res

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Estuarine material circulation depends on the presence of both phytoplankton and suspended microphytobenthos in the water column. However, the spatial distribution of suspended microphytobenthos and phytoplankton in estuaries is poorly understood. In this study, the abundance of suspended microphytobenthos and phytoplankton in the water column was determined along the salinity gradient in Lake Furen, Japan, from April to October 2015. Throughout the study period, surface and bottom salinity changed horizontally from <10 to >30. Phytoplankton was the main contributor to spatial increases in total cell abundance in mesohaline water as a result of the lake s hydrographic characteristics and water quality. The suspended microphytobenthos cell abundance in the surface and bottom water decreased with increasing salinity and was affected by the depth gradient. Suspended microphytobenthos cell abundances increased with depth (∼10 and 20% of total cell abundance in the surface and bottom water, respectively), which indicated that they were derived from microphytobenthos on the seafloor. The dominant suspended microphytobenthos taxa (Cocconeis spp. and Melosira varians) were mainly distributed in oligo-and mesohaline water, with peaks in mesohaline bottom water. In contrast, the dominant phytoplankton taxa (Skeletonema spp., Heterocapsa triquetra, and Prorocentrum spp.) were abundant at different salinity levels. The spatial distribution of dominant benthic and planktonic species in the water column was influenced by their tolerance to salinity. Our results suggest that suspended microphytobenthos contribute to microalgal communities in estuaries, especially those in bottom waters. Quantification of phytoplankton and suspended microphytobenthos will allow a better understanding of the effects of their spatial distribution on estuarine material circulation.

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Section: Horizontal and Vertical Distribution Patterns Of Suspended Msupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Tsuji

Montani

2017

Plankton Benthos Res

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“…This is consistent with the hypothesis that MPB development is stimulated by the release of dissolved organic and inorganic matter and biodeposits excreted by the oysters. As such, oysters and MPB would be connected in a local positive feedback loop with oysters "fertilizing" their main food source (Prins et al, 1997;Kasim and Mukai, 2006). Clear MPB seasonal dynamics consistent with the ecosystem location were also shown, and could be associated with variations in MPB patch shape.…”

Section: Discussionmentioning

confidence: 88%

Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

et al. 2018

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Abstract. Satellite remote sensing (RS) is routinely used for the large-scale monitoring of microphytobenthos (MPB) biomass in intertidal mudflats and has greatly improved our knowledge of MPB spatio-temporal variability and its potential drivers. Processes operating on smaller scales however, such as the impact of benthic macrofauna on MPB development, to date remain underinvestigated. In this study, we analysed the influence of wild Crassostrea gigas oyster reefs on MPB biofilm development using multispectral RS. A 30-year time series combining high-resolution (30 m) Landsat and SPOT data was built in order to explore the relationship between C. gigas reefs and MPB spatial distribution and seasonal dynamics, using the normalized difference vegetation index (NDVI). Emphasis was placed on the analysis of a before-after control-impact (BACI) experiment designed to assess the effect of oyster killing on the surrounding MPB biofilms. Our RS data reveal that the presence of oyster reefs positively affects MPB biofilm development. Analysis of the historical time series first showed the presence of persistent, highly concentrated MPB patches around oyster reefs. This observation was supported by the BACI experiment which showed that killing the oysters (while leaving the physical reef structure, i.e. oyster shells, intact) negatively affected both MPB biofilm biomass and spatial stability around the reef. As such, our results are consistent with the hypothesis of nutrient input as an explanation for the MPB growth-promoting effect of oysters, whereby organic and inorganic matter released through oyster excretion and biodeposition stimulates MPB biomass accumulation.MPB also showed marked seasonal variations in biomass and patch shape, size and degree of aggregation around the oyster reefs. Seasonal variations in biomass, with higher NDVI during spring and autumn, were consistent with those observed on broader scales in other European mudflats. Our study provides the first multi-sensor RS satellite evidence of the promoting and structuring effect of oyster reefs on MPB biofilms.

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“…has, however, not been reported before. Amphora is a common benthic microalgae found in coastal benthic and pelagic environments (Welker et al 2002;Kasim and Mukai 2006;Facca and Sfriso 2007). Benthic microalgal communities are important primary producers in a wide variety of shallow coastal areas (Cadee and Hegeman 1974;Colijn and De Jonge 1984;Cahoon and Cooke 1992;Barranguet 1997;Nelson et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Application of cross‐flow ultrafiltration for isolating exopolymeric substances from a marine diatom (Amphora sp.)

Zhang

Santschi

2009

Limnology & Ocean Methods

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The increasing recognition of the roles that exopolymeric substances (EPS) play in the aquatic environment necessitates obtaining sufficient quantities of purified EPS for exploration of its physical, chemical, and biological properties, as well as for quantitative and structural analysis of its composition. For this purpose, three preconcentration/purification techniques, i.e., 1) ethanol precipitation, 2) stirred-cell ultrafiltration, and 3) crossflow ultrafiltration, followed by stirred-cell diafiltration, were compared for their effectiveness to quantitatively isolate EPS from laboratory cultures of Amphora sp. The results showed that the classical ethanol precipitation method was not effective in isolating and concentrating EPS from this seawater culture medium. Stirredcell ultrafiltration appeared best for harvesting EPS from this diatom. However, because of its limitations in terms of time and volume, cross-flow ultrafiltration needed to be first applied, along with some necessary improvements, followed by a three-step cartridge soaking and stirred-cell diafiltration. After cartridge soaking, the yields of the two ultrafiltration methods were comparable. Two different fractions were obtained from EPS of Amphora sp. by anion exchange chromatography and were characterized respectively. Whereas these purified fractions had similar molecular weights of 1000 kDa, their monosaccharide composition was different. In conclusion, cross-flow ultrafiltration followed by stirred-cell diafiltration with additional cartridge washing turned out to be the optimal method for EPS separation, based on time, cost, and yield.

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Contribution of benthic and epiphytic diatoms to clam and oyster production in the Akkeshi-ko estuary

Cited by 86 publications

References 37 publications

Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

Application of cross‐flow ultrafiltration for isolating exopolymeric substances from a marine diatom (Amphora sp.)

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