Phytoplankton biomass and primary productivity of the south-eastern Mediterranean

Dowidar, N. M.

doi:10.1016/0198-0149(84)90052-9

Cited by 71 publications

(28 citation statements)

References 18 publications

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“…There was a clear slight temperature increase from site (1) to site (2) in the summer and a reverse trend during the winter with significance level (p<0.01) between the four seasons except in the case of summer and autumn, which was insignificant at site 1. These results are in agreement with [19,20] and lower than data recorded by [21] who found that in the central Red Sea, the water temperature was fluctuated from (22.8ºC) in winter to (31.5ºC) in summer and [22] who reported that the water temperature reported that the water temperature value increased from (27.8ºC) to (31.7ºC) at five stations from the Red Sea coast in Jeddah. Water acidity is known to influence the solubility, availability and toxicity of metals in the aquatic ecosystems [23].…”

Section: Physico-chemical Parameterscontrasting

confidence: 39%

Efficiency of Polychaete Nereis (Neanthes) Succinea as Biomonitor for Heavy Metals Pollution in the Red Sea, Egypt

Said¹

2017

ABB

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Abstract:Polychaetes nereids groups are the most common in shallow marine habitats and abundant in benthic communities. This group was proved to tolerate a high burden of heavy metals within their tissues. The current work assesses the effect of water criteria; sea water temperature, hydrogen ion concentration (pH), dissolved oxygen concentration, turbidity, conductivity and salinity on the uptake and storage of four heavy metals; Mn,, Pb, Cd and Cu in tissues of the marine polychaete worm Nereis succinea collected from two sites at Hurghada, Red sea; the Marine Biological Station (MBS) and the Fishing Port at Sakala (FPS). Bioaccumulation Factors (BAFs) were determined to evaluate the capability of the investigated annelid worm to accumulate heavy metals, so as to be used as sentinel species for monitoring metal pollutants. Population density of the investigated polychaete was determined at both studied sites as related to water criteria. ANOVA statistical analysis has indicated significant higher concentration of Mn, Pb, Cd and Cu in water at FBS than MBS (P<0.01) and high tissue concentration of Mn, Cd, Pb and Cu at individuals collected from FBS (P<0.01). The highest value of annual mean of BAF at Nereis tissues were recorded for Cu (1023.09±816.55), while the lowest BAF was for Pb (162.97±118.03). Polychaete abundance was significantly higher at MBS. Significant effect was found for water criteria on metal bioaccumulation and population density of Nereis. Data were discussed to evaluate the sensitivity of N. succinea to heavy metal pollutants and its possible use as biological monitor for metal contaminants at marine habitats.

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Section: Physico-chemical Parameterscontrasting

confidence: 39%

Efficiency of Polychaete Nereis (Neanthes) Succinea as Biomonitor for Heavy Metals Pollution in the Red Sea, Egypt

Said¹

2017

ABB

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“…Except for reports of blooms related to river input and manmade effluent near the Mediterranean coast and in semienclosed bays (UNESCO 1988), other studies in the eastern and western Mediterranean during different seasons have reported low Chl a values (Fumestin 1973;Dowidar 1984;Estrada 1982Estrada , 1985. In fact, Chl a values of 23.1 pg liter-' in the open ocean are rare and typically from highly productive coastal upwelling regions such as those off Peru or Africa (Andrews and Hutchings 1980;Estrada and Marrase 1987;Brown and Hutchings 1987).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Single-species dominance in a subsurface phytoplankton concentration at a Mediterranean Sea front

Gould

Wiesenburg

1990

Limnol. Oceanogr.

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“…Indeed, the winter bloom has been defined as the unifying feature for phytoplankton in the Mediterranean Sea (Travers, 1974;Duarte et al, 1999), where it has been recorded all along the coasts (e.g. Margalef and Castellví, 1967;Becacos-Kontos, 1968;Lenzi Grillini and Lazzara, 1978;Dowidar, 1984;Mura et al, 1996;Caroppo et al, 1999;Psarra et al, 2000). Being presumably driven by the above mentioned large-scale meteorological features, it is conceivable that the winter bloom occurs at about the same time at coastal sites over a wider area, although local conditions may detain a precisely synchronised pattern.…”

Section: Seasonal Phasesmentioning

confidence: 99%

Seasonal patterns in plankton communities in a pluriannual time series at a coastal Mediterranean site (Gulf of Naples): an attempt to discern recurrences and trends

et al. 2004

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SUMMARY: The annual cycle of plankton was studied over 14 years from 1984 to 2000 at a coastal station in the Gulf of Naples, with the aim of assessing seasonal patterns and interannual trends. Phytoplankton biomass started increasing over the water column in February-early March, and generally achieved peak values in the upper layers in late spring. Another peak was often recorded in autumn. Diatoms and phytoflagellates dominated for the largest part of the year. Ciliates showed their main peaks in phase with phytoplankton and were mainly represented by small (< 30 µm) naked choreotrichs. Mesozooplankton increased in March-April, reaching maximum concentrations in summer. Copepods were always the most abundant group, followed by cladocerans in summer. At the interannual scale, a high variability and a decreasing trend were recorded over the sampling period for autotrophic biomass. Mesozooplankton biomass showed a less marked interannual variability. From 1995 onwards, phytoplankton populations increased in cell number but decreased in cell size, with intense blooms of small diatoms and undetermined coccoid species frequently observed in recent years. In spite of those interannual variations, the different phases of the annual cycle and the occurrence of several plankton species were remarkably regular.Key words: Mediterranean Sea, phytoplankton, ciliates, mesozooplankton, seasonal cycle, long term series. RESUMEN: PATRONES ESTACIONALES EN LAS COMUNIDADES PLANCTÓNICAS EN UNA SERIE TEMPORAL PLURIANUAL EN UNA LOCALIDAD COSTERA DEL MEDITERRÁNEO (GOLFO DE NÁPOLES): UN INTENTO DE DISCERNIR RECURRENCIAS Y TENDENCIAS.-El ciclo anual del plancton se estudió a lo largo de 14 años, desde 1984 a 2000, en una estación costera del golfo de Nápoles, con el objetivo de discernir pautas estacionales y tendencias interanuales. La biomasa fitoplanctónica empezaba a aumentar en la columna de agua en febrero-primeros de marzo, y generalmente alcanzaba valores máximos en las capas superiores a finales de primavera. Se solía registrar otro máximo en otoño. Las diatomeas y los fitoflagelados dominaron durante la mayor parte del año. Los ciliados presentaron sus máximos principales en fase con el fitoplancton y estuvieron representados principalmente por pequeños (< 30 µm) coreotricos desnudos. El mesozooplancton aumentó en marzo-abril, llegando a concentraciones máximas en verano. Los copépodos fueron siempre el grupo más abundante, seguidos de los cladóceros en verano. A la escala interanual, la biomasa autotrófica registró una elevada variabilidad y una tendencia decreciente a lo largo del período de muestreo. La biomasa del mesozooplancton mostró una variabilidad interanual menos marcada. Desde 1995 en adelante, las poblaciones de fitoplancton aumentaron en número de células, pero el tamaño celular se redujo, y en años recientes se han observado floraciones intensas de diatomeas pequeñas y de especies cocoides no determinadas. A pesar de estas variaciones interanuales, las distintas fases del ciclo anual y la presencia de varias es...

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Phytoplankton biomass and primary productivity of the south-eastern Mediterranean

Cited by 71 publications

References 18 publications

Efficiency of Polychaete Nereis (Neanthes) Succinea as Biomonitor for Heavy Metals Pollution in the Red Sea, Egypt

Efficiency of Polychaete Nereis (Neanthes) Succinea as Biomonitor for Heavy Metals Pollution in the Red Sea, Egypt

Single-species dominance in a subsurface phytoplankton concentration at a Mediterranean Sea front

Seasonal patterns in plankton communities in a pluriannual time series at a coastal Mediterranean site (Gulf of Naples): an attempt to discern recurrences and trends

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