Spatio-temporal variability of phytoplankton (Chlorophyll-a) in relation to salinity, suspended sediment concentration, and light intensity in a macrotidal estuary

Azhikodan, Gubash; Yokoyama, Katsuhide

doi:10.1016/j.csr.2016.07.006

Cited by 56 publications

(13 citation statements)

References 52 publications

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“…In the spring and summer seasons, independently of the tide, chlorophyll a peaked in the upstream oligohaline area of the estuary (salinity 0.5-5), whereas in the fall it peaked in freshwater, and during winter in the downstream polyhaline area. The observed patterns during the warmest period of the year at the interface between freshwater and saltwater, were also reported previously [13], as well as for the fall [41]. Moreover, chlorophyll a peaks may also occur in higher salinity areas [40,42].…”

Section: Chlorophyll a And Bacteria Dynamicssupporting

confidence: 87%

“…For the box model, the obtained salinity values at each sampling site were used to classify water masses according to the Venice System [30] and the Water Framework Directive [31], i.e., freshwater (salinity < 0.5), brackish water (0.5-30), and seawater or euhaline water (>30), with brackish water subdivided into three groups, oligohaline (0.5-5), mesohaline (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), and polyhaline (18-30).…”

Section: The Box Modelmentioning

confidence: 99%

“…The freshwater inflow may have a tremendous effect since it controls residence time, and the susceptibility of the ecosystems to algal blooms, with effects on the food web [12]. Tides also influence phytoplankton dynamics leading to a biomass increase during neap tides, and a decrease during spring tides [9,13], and gradient variations in the ebb and flood tides [14]. As the phytoplankton rapidly responds to changes in the environmental conditions, the dynamic structure of phytoplankton communities reflects the health of the aquatic ecosystems [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Coupling between Hydrodynamics and Chlorophyll a and Bacteria in a Temperate Estuary: A Box Model Approach

Fernandes

Teixeira

Bordalo

2019

Water

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The spatial patterns of chlorophyll a and bacteria were assessed in a temperate Atlantic tidal estuary during seasonal surveys, as well as in consecutive summer spring and neap tides. A box model approach was used to better understand spatial and temporal dynamics of these key estuarine descriptors. The Lima estuary (NW Portugal) was divided into boxes controlled by salinity and freshwater discharge and balance equations were derived for each variable, enabling the calculation of horizontal and vertical fluxes of plankton and, therefore, production or consumption rates. Chlorophyll a tended to burst within the oligohaline zone, whereas higher counts of bacteria were found in the mesohaline stretch. Whenever the water column was stratified, similar tide-independent trends were found for chlorophyll a and bacterial fluxes, with net growth in the upper less saline boxes, and consumption beneath the halocline. In the non-stratified upper estuary, other controls emerged for chlorophyll a and bacteria, such as nitrogen and carbon inputs, respectively. The presented results show that, while tidal hydrodynamics influenced plankton variability, production/consumption rates resulted from the interaction of additional factors, namely estuarine geomorphological characteristics and nutrient inputs. In complex estuarine systems, the rather simple box model approach remains a useful tool in the task of understanding the coupling between hydrodynamics and the behavior of plankton, emerging as a contribution toward the management of estuarine systems.

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Section: Chlorophyll a And Bacteria Dynamicssupporting

confidence: 87%

Section: The Box Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling between Hydrodynamics and Chlorophyll a and Bacteria in a Temperate Estuary: A Box Model Approach

Fernandes

Teixeira

Bordalo

2019

Water

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“…In macrotidal zones, physical processes control the system dynamics with large amounts of organic and inorganic compounds being reworked and transported within the estuary (Burford et al, 2008). In turbid estuaries under strong mixing conditions, tidal force is the most dominant factor, which can vary over time (diurnally, fortnightly or seasonally) (Azhikodan and Yokoyama, 2016). Wind force also promotes continuous vertical mixing of the water column allowing the translocation of oxygen-saturated water and protecting proximate coastal water bodies from eutrophication since macrotidal currents decrease the response of primary production to enhanced nutrient inputs (Cloern, 2001).…”

Section: Introductionmentioning

confidence: 99%

Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

et al. 2018

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Cavalcanti et al.: Microphytoplankton of a macrotidal estuarine complex 283 Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão -BrazilSão Marcos Bay is an estuarine complex with semidiurnal tides that can reach more than 7 m during equinoctial spring tides. It is situated in the second largest Brazilian coastline and is subjected to continuous human activities holding an important port complex of Latin America. In order to contribute to the knowledge about the structure of the phytoplankton in a macrotidal systems, this study aims to evaluate the phytoplankton community and its relationship with environmental conditions in the São Marcos Bay. Five surveys in 2010 and 2011 were carried out on four sampling points during the rainy and dry seasons. Samples were taken during the flood and ebb phases at neap tides. Hydrological parameters were correlated with biological data (phytoplankton composition, abundance and biomass) using statistical analysis. The phytoplankton biomass (chlorophyll a) characterized the bay as quite productive (10.43±7.62 mg m -3 ) with the nanophytoplankton as the dominant fraction. Seasonal variation was observed in phytoplankton abundance with higher values (34,262±18,422 cells L -1 ) in the rainy season. Diatoms were the most important phytoplankton group, pointing out Nitzschia sp., Diploneis weissflogii and Synedra sp. as the dominant species. This study revealed that the composition of phytoplankton community was mainly influenced by the local dynamics, governed by macrotides, and precipitation regime that mostly contributed to the seasonal fluctuations of the environmental conditions, such as salinity, dissolved oxygen, and nutrients.

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“…Studies on CHL-A have been conducted in various water bodies from coastal estuarine areas to oceanic, mainly focusing on the spatial and temporal changes, size distribution, and relationships with environmental factors (Iriarte & Purdie, 1994;Agawin, Duarte, & Agustí, 2000;Calvo-Díaz, Morán, & Suárez, 2008;Azhikodan & Yokoyama 2016). However, presently there are still limited information on the CHL-A in sea cucumber culture pond.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Jiang¹,

Tang²,

Ren³

et al. 2020

Turk. J. Fish. Aquat. Sci.

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The annual variation features of chlorophyll a in Apostichopus japonicus culture ponds were investigated in this study. CHL-A concentration presented clear seasonal fluctuations in the ponds with annual mean value of 19.60 ± 11.29 μg L-1 , in which it showed peaking value in summer time. The contributions of size-fractionated phytoplanktons to CHL-A were ordered as micro > nano > meso-macro > pico. The combined influences of SiO3 2-Si, NO2-N, salinity and water temperature on CHL-A concentrations in the ponds were extremely significant (F > F0.01), in which SiO3 2-Si concentration was the controller among them.

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Spatio-temporal variability of phytoplankton (Chlorophyll-a) in relation to salinity, suspended sediment concentration, and light intensity in a macrotidal estuary

Cited by 56 publications

References 52 publications

Coupling between Hydrodynamics and Chlorophyll a and Bacteria in a Temperate Estuary: A Box Model Approach

Coupling between Hydrodynamics and Chlorophyll a and Bacteria in a Temperate Estuary: A Box Model Approach

Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

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