The Method for Water Sampling of Bottom Layer in Inland Sea.

Manabe, Takehiko; Tanada, M.

doi:10.2331/suisan.51.1745

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…1). Water samples were collected from three depths; surface, 5 m (for four stations which were <10 m deep), or 10 m (the other 15 stations), and 1 m above the bottom (B-1 m) using a clean bucket and a Kitahara or VanDorn water sampler (Manabe and Tanda 1985).…”

Section: Water Quality and Phytoplanktonmentioning

confidence: 99%

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Nishikawa

Hori

Nagai

et al. 2009

Estuaries and Coasts

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Long-term monitoring of water quality and phytoplankton was conducted at 19 sampling stations in Harima-Nada, eastern Seto Inland Sea, Japan for 35 years from 1973 to 2007. There were two significant long-term changes, an increase in winter water temperatures of 0.042°C year −1 , and a decrease in dissolved inorganic nitrogen (DIN) from about 10 μM in the 1970s to~5 μM in the late 1990s due to the reduction in nutrient inputs. DIN concentrations and total phytoplankton cell density were both higher during the 1970s to the early 1980s and then exhibited a significant decrease in the mid 1980s and remained relatively constant thereafter. Diatoms were the dominant phytoplankton group (>90%) over the 35-year period, and there was a dramatic shift from Skeletonema dominance (~70%) to Chaetoceros in the mid 1980s. This shift in diatom species may be attributed to differences in the life cycle of Skeletonema and Chaetoceros and the response to the decrease in DIN concentration.

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Section: Water Quality and Phytoplanktonmentioning

confidence: 99%

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Nishikawa

Hori

Nagai

et al. 2009

Estuaries and Coasts

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“…At Stns. H1 and H28, samples were collected from three depths: surface, 5 m (H28) or 10 m (H1), and 1 m above the bottom (B-1 m) using either a Kitahara or Van-Dorn water sampler (Manabe and Tanda, 1985). Water temperature and salinity were measured using a submersible fluorometer (model ACL215, Alec Electronics) at the same depth and time of samplings.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics of the harmful diatom Eucampia zodiacus Ehrenberg causing bleachings of Porphyra thalli in aquaculture in Harima-Nada, the Seto Inland Sea, Japan

Nishikawa

Hori

Tanida³

et al. 2007

Harmful Algae

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“…H5) or 30 m (Stn. A6), using a clean bucket (surface water), and a Kitahara or Van-Dorn water sampler (Manabe & Tanda 1985). Water temperature and salinity were measured using a CTD (RINKO-Profiler ASTD102, JFE Advantech) at the same depth and time as the water sampling.…”

Section: Methodsmentioning

confidence: 99%

Temporal variations in the copepod community structure during the sand lance fishery season near the Akashi Strait, eastern Seto Inland Sea

Nishikawa,

Watanabe,

Furusawa

et al. 2024

Plankton Benthos Res

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Around the Akashi Strait, about half of the catch of the sand lance in Harima-Nada and Osaka Bay is caught in winter to early spring. The annual catch has continued to decrease after the 1990s, and it is suggested that the decline in catch was caused by copepod shortage as food. In the present study, frequent samplings of copepods were conducted from December to early April around the Akashi Strait for three years to evaluate copepod abundance and biomass. Around the Akashi Strait, the dominant species by abundance were Paracalanus spp., Oithona spp. and Microsetella norvegica, but by biomass, the most dominant was Calanus sinicus. Cluster analysis showed that copepod adult communities, based on biomass, were classified into five groups, and the representative species were Oithona similis, Subeucalanus crassus, M. norvegica, Euchaeta plana and C. sinicus, respectively. Especially from February to early April, most of the copepod communities were classified into cluster group 5, characterized by a high biomass of C. sinicus. This period coincides with the active feeding on copepods by sand lance. These results suggest that C. sinicus is the most important prey item for sand lance around the Akashi Strait. In addition, the temporal recruitment of pelagic species such as S. crassus and E. plana contributed to an increase in copepod biomass. There is concern that environmental shifts will lead to declines in C. sinicus, resulting in a decline in the total copepod biomass in this area.

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The Method for Water Sampling of Bottom Layer in Inland Sea.

Cited by 6 publications

References 2 publications

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Population dynamics of the harmful diatom Eucampia zodiacus Ehrenberg causing bleachings of Porphyra thalli in aquaculture in Harima-Nada, the Seto Inland Sea, Japan

Temporal variations in the copepod community structure during the sand lance fishery season near the Akashi Strait, eastern Seto Inland Sea

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