Effect of salinity gradients on the distribution of phytoplankton pigments in a stratified estuary

Ahel, Marijan; Barlow, Raymond G; Mantoura, R.F.C.

doi:10.3354/meps143289

Cited by 48 publications

(24 citation statements)

References 12 publications

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“…As microscopic counts showed that the most numerous phytoplankton were microplanktonic diatoms, it seems likely that fucoxanthin in the Zrmanja Estuary originated mainly from diatoms, consistently as in earlier studies in the eutrophic coastal and estuarine waters (Ahel et al 1996;Ahel and Terzić 1998;Ansotegui et al 2001;Seoane et al 2005).…”

Section: Discussionmentioning

confidence: 87%

“…The Zrmanja Estuary shows a similarity with the neighbouring Krka Estuary, with respect to the prounounced stratification (Žutić and Legović 1987) and low content of suspended inorganic and organic matter (Moreira-Turcq et al 1993;Cauwet 1991;Svensen et al 2007). The halocline provides an interface that accumulates micro-and nanophytoplankton (Viličić et al 1989;Denant et al 1991;Ahel et al 1996), bacteria (Fuks et al 1991), dissolved organic matter and detritic particles (Žutić and Legović 1987;Cauwet 1991), and pollutants (Mikac et al 1989) along the brackish water-sea water interface.…”

Section: Discussionmentioning

confidence: 94%

“…The five most prominent biomarkers such as fucoxanthin, peridinin, 19′-hexanoyloxyfucoxanthin, alloxanthin, and chlorophyll b, were chosen to illuminate temporal and spatial variability of diatoms, dinoflagellates, coccolithophorids, cryptophytes, and green algae, respectively (Barlow et al 1993(Barlow et al , 1997Ahel et al 1996;Ahel and Terzić 1998). Filters containing phytoplankton were extracted in 4 ml of cold 90% acetone using sonication, and then centrifuged to clarify the extract.…”

Section: Water Column Samplingmentioning

confidence: 99%

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Phytoplankton abundance and pigment biomarkers in the oligotrophic, eastern Adriatic estuary

Viličić

Terzić

Ahel

et al. 2007

Environ Monit Assess

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Phytoplankton distribution and environmental characteristics were determined in a shallow, highly stratified and oligotrophic estuary (Zrmanja, eastern Adriatic). Samples were collected in two contrasting seasons; winter (February 2000), when river discharge was high, and in summer (July 2003), a period of drought. Phytoplankton distribution was closely related to salinity gradients, nutrient levels, and water residence time. Microscopic analysis revealed that phytoplankton was composed mainly of marine diatoms, dinoflagellates, cryptophytes, green flagellates, and coccolithophorids. The dominant biomarker pigments were fucoxanthin, alloxanthin and 19'-hexanoyloxyfucoxanthin, while lower, but indicative contributions of peridinin and chlorophyll b were also noted. Maximum abundance and biomass were found in the middle estuary in winter and in the upper estuary in summer. The estuary is mostly P-limited. Development of chain-forming marine diatoms was evident in winter. Due to the reduced nutrient input in summer, the biomass accumulated in the upper estuary (1,000 ng chlorophyll a l(-1)) was composed mostly of nanoplanktonic unicellular diatoms, nanoplanktonic marine dinoflagellates, cryptophytes, and chlorophytes. The concentrations of about 200 ng l(-1) hex-fuco, suggested that the contribution of prymnesiophytes to total biomass was comparable to that of diatoms and dinoflagellates. In the middle estuary and coastal sea, PO(4) and TIN were 3.5 times lower, resulting in a fivefold decrease in biomass (<100 ng chlorophyll a l(-1)). The oligotrophic Zrmanja and other karstic rivers discharging in the eastern Adriatic Sea, provide insufficient source of nutrients and low productivity of the eastern Adriatic Sea.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 94%

Section: Water Column Samplingmentioning

confidence: 99%

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Phytoplankton abundance and pigment biomarkers in the oligotrophic, eastern Adriatic estuary

Viličić

Terzić

Ahel

et al. 2007

Environ Monit Assess

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“…One place where we might expect to find accumulations of particles might be at density interfaces; divers have reported such "curtains" or "veils" of particles many times but of course, such things do not appear completely real until someone measures or counts them (Zutić and Legović, 1987;Henneke and De Lange, 1990;MacIntyre et al, 1995;Ahel et al, 1996). Observation and capture by divers is necessarily limited to surface waters.…”

Section: The Continuity Principlementioning

confidence: 99%

Methods of sampling and analysis and our concepts of ocean dynamics

Wangersky¹

2005

Sci. Mar.

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SUMMARY: In the last two decades, the increase in multi-nation, multi-ship projects has underlined the importance of intercalibration and intercomparison studies. At the same time, it is becoming obvious that with our present methods of sampling and analysis we can never hope to distinguish the variability in our sampling and analysis techniques from the variability in the universe sampled. The presence of discontinuities in many of the quantities measured suggests that our sampling grid, as maintained by oceanographic vessels, is too limited both in space and in time. Some variety of self-reporting sampling buoy is the obvious answer for physical and chemical parameters, although as yet we do not have detectors for many of the quantities of interest. Even with such buoys, it would seem unlikely that we could construct a grid of such buoys tight enough to measure the local variability of the oceans without the buoys themselves contributing to this variability. The limit finally selected for such a sampling grid will probably be some compromise between scientific capability and economic reality. -En las dos últi-mas décadas el incremento de los proyectos multi-nacionales, con la utilización de muchos barcos ha subrayado la importancia de inter-calibración y comparación de estudios. Al mismo tiempo es obvio que con los métodos actuales de muestreo

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“…Estuaries are biologically dynamic zones with intensive exchange of matter and energy occurring between terrestrial and marine ecosystems (Prandle, 2009;Ahel, et al, 1996). Physicochemical properties play a major role in determining the density, diversity and occurrence of phytoplankton in marine and freshwater ecosystem.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of Phytoplankton Assemblage in Relation to Environmental Variables of Narmada Estuarine Region of Gulf of Khambhat, Gujarat, India

2015

AEER

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Effect of salinity gradients on the distribution of phytoplankton pigments in a stratified estuary

Cited by 48 publications

References 12 publications

Phytoplankton abundance and pigment biomarkers in the oligotrophic, eastern Adriatic estuary

Phytoplankton abundance and pigment biomarkers in the oligotrophic, eastern Adriatic estuary

Methods of sampling and analysis and our concepts of ocean dynamics

An Evaluation of Phytoplankton Assemblage in Relation to Environmental Variables of Narmada Estuarine Region of Gulf of Khambhat, Gujarat, India

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