Geographical and seasonal variations in mesozooplankton abundance and biomass in relation to environmental parameters in Lake Shinji–Ohashi River–Lake Nakaumi brackish-water system, Japan

Uye, Shin-ichi; Shimazu, Takayuki; Yamamuro, Masumi; Ishitobi, Yu; Kamiya, Hiroshi

doi:10.1016/s0924-7963(00)00054-3

Cited by 57 publications

(27 citation statements)

References 16 publications

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“…The minor relative abundance of rotifers was 3.70% during the study period. Similar results in relative abundance of zooplankton groups were previously reported in the northern part of the Red Sea [87,88] and insome lakes in Japan [89][90][91] and in Egypt [92]. Dominance of calanoids agreed with Cornils [93] for the northern part of the Red Sea, he reported that bulk of the mesozooplankton (>70%) have climax of calanoids, cyclopoids and appendicularians.…”

Section: Zooplanktonsupporting

confidence: 86%

Ecological Study of the Rabigh Lagoon, Eastern Site of the Red Sea, Saudi Arabia with Special Reference to Eutrophication Index

Touliabah¹,

El-Bassat²

2017

J Marine Sci Res Dev

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Seasonal variation in plankton community structure (phytoplankton and zooplankton), chlorophyll a and some physico-chemical properties of Rabigh Lagoon were studied during 2015. The study aimed to estimate the environmental health of Rabig Lagoon as well as renewing the ecological data base for the investigated area. The study area included seven sites situated between latitudes 22.9978° to 22.8519° and longitudes 38.8339° to 38.9616°E. The ecological parameters comprise some physical and chemical parameters as Temperature, Secchi Disc, pH, DO, S%, Nutrients "Nitrite, NO2-N; Nitrate, NO3-N; Ammonia, NH3-N; total nitrogen, T-N; Reactive phosphate, PO4-P and total phosphorus, T-P". A total of 103 species belonging to five phytoplanktonic groups were identified. The most leadings group is Bacillariophyceae (45.05%) then Cyanophyceae (33.83%) followed by Dinophyceae (20.99%). On the other hand, Chrysophyceae (0.07%). and Chlorophyceae (0.05) are considered a rare group. Chlorophyll a showed almost the same pattern with the standing crops of the phytoplankton ranged between 12.33 μg l-1 during spring and a lowest value of 5.49 μg l-1 during summer. The most dominant group of zooplankton was Copepoda (89.00%) followed by Protista (7.30%) and Rotifera (3.70%). Dominancy of Copepoda was recorded during all the investigation period except autumn. The Diversity Index fluctuated between 2.785 during autumn and 3.568 during summer. Twenty one zooplankton species belonging to 18 genera were recorded during the present study. Calculating trophic status index according to Secchi Disc methods was found to be better than chlorophyll a and total phosphorus methods. The analysis showed that Rabigh Lagoon is a mesotrophic ecosystem. Canonical correspondence analysis (CCA) was carried out to reveal the relations between the physico-Chemical parameters and plankton groups.

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Section: Zooplanktonsupporting

confidence: 86%

Ecological Study of the Rabigh Lagoon, Eastern Site of the Red Sea, Saudi Arabia with Special Reference to Eutrophication Index

Touliabah¹,

El-Bassat²

2017

J Marine Sci Res Dev

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“…1934, 1958, therefore cultured individuals were used for the series of experiments in this study. The ark shell was cultured in pearl nets hung at a depth of 1.0-1.5 m in Lake Nakaumi (temperature 4.9-28.4°C, salinity 17.3-24.6) (Uye et al 2000) for a period of approximately 1.5 year after larval settlement. Mean shell length of the clams used in the study was 28.2 1.71 mm (SD).…”

Section: Animalsmentioning

confidence: 99%

Biochemical responses to anoxia and hypoxia in the ark shell Scapharca kagoshimensis

Miyamoto

Iwanaga

2012

Plankton Benthos Res

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Metabolic adaptation to 7-d sustained anoxia, and the activation of anaerobic metabolism by a series of O 2 concentrations during a 12-h period, were examined in the ark shell Scapharca kagoshimensis. Laboratory experiments and biochemical analyses were conducted under summer conditions. The pattern of metabolic adaptation to prolonged anoxia was clearly biphasic, similar to that in many other bivalve species. The first, transition stage lasted 12 h and was characterized by sharp decreases in adenylate energy charge, aspartate consumption, and accumulation of succinate and alanine. The second, stationary stage was characterized by glycogen depletion and propionate accumulation. In a series of dissolved oxygen (DO) conditions, the onset of anaerobic metabolism (as indicated by a decrease in fermentative substrate, aspartate; and increase in the end-products, succinate and alanine) was detected only under hypoxic conditions (< 2 mg O 2 L 1 ) and was accompanied by depressed physiological performance, as measured by clearance rate and ammonium excretion rate. However, under milder hypoxia (1-2 mg O 2 L 1 ), a significant clearance rate was still observed, suggesting that both aerobic and anaerobic metabolisms were contributing toward the ATP yield. Lower DO (< 0.61 mg O 2 L 1 ) resulted in an increased rate of anaerobic metabolism and inactivated aerobic ATP production due to impaired filter feeding.

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“…In this research, we focus on the waters of Japan's Lake Shinji and Lake Nakaumi (SJNU), which are well known as brackish water zones with abundant fishery and sightseeing resources such as birds and clams. To protect these resources, water quality monitoring has been conducted at fixed points for a long time [3][4][5][6][7]. However, recent years have seen abnormal phenomena in water bodies such as cyanobacteria bloom, red tide, dysoxic bottom water and the sudden occurrence of seagrass [8,9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Unified Algorithms for Remote Sensing of Chlorophyll-a and Turbidity in Lake Shinji and Lake Nakaumi of Japan and the Vaal Dam Reservoir of South Africa under Eutrophic and Ultra-Turbid Conditions

Sakuno

Yajima

Yoshioka

et al. 2018

Water

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Abstract:We evaluated unified algorithms for remote sensing of chlorophyll-a (Chla) and turbidity in eutrophic and ultra-turbid waters such as Japan's Lake Shinji and Lake Nakaumi (SJNU) and the Vaal Dam Reservoir (VDR) in South Africa. To realize this objective, we used 38 remote sensing reflectance (R rs ), Chla and turbidity datasets collected in these waters between July 2016 and March 2017. As a result, we clarified the following items. As a unified Chla model, we obtained strong correlation (R 2 = 0.7, RMSE = 2 mg m −3 ) using a two-band model (2-BM) and three-band model (3-BM), with R rs (687)/R rs (672) and [R rs −1 (687) − R rs −1 (672)] × R rs (832). As a unified turbidity model, we obtained strong correlation (R 2 = 0.7, RMSE = 260 NTU) using 2-BM and 3-BM, with R rs (763)/R rs (821) and R rs (810) − [R rs (730) + R rs (770)]/2. When targeting the Sentinel-2 Multispectral Imager (MSI) frequency band, we focused on MSI Bands 4 and 5 (R rs (740) and R rs (775)) for the Chla algorithm. When optically separating SJNU and VDR data, it is effective to use the slopes of MSI Bands 3 and 4 (R rs (560) and R rs (665)) and the slopes of MSI Bands 7 and 9 (R rs (775) and R rs (865)).

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Geographical and seasonal variations in mesozooplankton abundance and biomass in relation to environmental parameters in Lake Shinji–Ohashi River–Lake Nakaumi brackish-water system, Japan

Cited by 57 publications

References 16 publications

Ecological Study of the Rabigh Lagoon, Eastern Site of the Red Sea, Saudi Arabia with Special Reference to Eutrophication Index

Ecological Study of the Rabigh Lagoon, Eastern Site of the Red Sea, Saudi Arabia with Special Reference to Eutrophication Index

Biochemical responses to anoxia and hypoxia in the ark shell Scapharca kagoshimensis

Evaluation of Unified Algorithms for Remote Sensing of Chlorophyll-a and Turbidity in Lake Shinji and Lake Nakaumi of Japan and the Vaal Dam Reservoir of South Africa under Eutrophic and Ultra-Turbid Conditions

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