Phytoplankton Blooms in Black Sea and Mediterranean Coastal Ecosystems Subjected to Anthropogenic Eutrophication: Similarities and Differences

Moncheva, Snejana; Gotsis‐Skretas, Olympia; Pagou, Κalliopi; Krastev, Anton

doi:10.1006/ecss.2001.0767

Cited by 196 publications

(108 citation statements)

References 23 publications

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“…In Elefsis Bay, the occurrence of HABs is sporadic in time and recurrence of the causative species (Ignatiades & Gotsis-Skretas, 2010). Eventually, more acidified conditions could impact the processes determining the final N-species available for biological consumption, a shift which is controlled by a series of biological and physical interactions including global climatic changes (Moncheva et al, 2001). …”

Section: Implications For Enclosed Embayment In Future Co 2 Conditionsmentioning

confidence: 99%

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

et al. 2018

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Naturally occurring microbial decomposition of organic matter (OM) in coastal marine environments cause increased acidity in deeper layers similar or even exceeding the future predictions for global ocean acidification (OA). Experimental studies in coastal areas characterized by increased inputs of OM and nutrients, coping with intermittent hypoxic/anoxic conditions, provide better understanding of the mechanisms affecting nutrients and carbon biogeochemistry under the emerging effects of coastal pH decrease. Laboratory CO 2 -manipulated microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay (Saronikos Gulf, Eastern Mediterranean) focusing to study the co-evolution of processes affected by the decline of dissolved oxygen and pH induced by (a) OM remineralization and (b) the future anthropogenic increase of atmospheric CO 2 . Under more acidified conditions, a significant increase of total alkalinity was observed partially attributed to the sedimentary carbonate dissolution and the reactive nitrogen species shift towards ammonium. Νitrate and nitrite decline, in parallel with ammonium increase, demonstrated a deceleration of ammonium oxidation processes along with decrease in nitrate production. The decreased DIN:DIP ratio, the prevalence of organic nutrient species against the inorganic ones, the observations of constrained DON degradation and nitrate production decline and the higher DOC concentrations revealed the possible inhibition of OM decomposition under lower pH values. Finally, our results highlight the need for detailed studies of the carbonate system in coastal areas dominated by hypoxic/anoxic conditions, accompanied by other biogeochemical parameters and properly designed experiments to elucidate the processes sequence or alterations due to pH reduction.

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Section: Implications For Enclosed Embayment In Future Co 2 Conditionsmentioning

confidence: 99%

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

et al. 2018

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“…Despite data on 305 zooplankton not being available for all the study period, Monteiro (2003) Despite nutrient discharges from point sources in specific areas of Tagus estuary, no 333 evidence of poor water quality relationships with changes in phytoplankton structure 334 could be found. In fact, Cyanobacteria and Dinophyceae, which are dominant in high 335 trophic state ecosystems, as well as Cryptophyceae whose predominance during the 336 summer is known to be an indicator of eutrophication (Moncheva et al 2001), were all 337 minor contributors to the algal community. Indeed, they represented only 1-2 % of the 338 phytoplankton total abundance, suggesting that, at present, cultural eutrophication is not 339 a problem in this estuary.…”

Section: Statistical Analysis 229mentioning

confidence: 99%

Phytoplankton community structure defined by key environmental variables in Tagus estuary, Portugal

Brogueira

Oliveira

Cabeçadas

2007

Marine Environmental Research

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“…Phytoplankton functional groups and harmful algal species in anthropogenically impacted waters of the NW Mediterranean Sea* coastal waters, transport of harmful phytoplankton species via ballast-water vessels, and the translocation of shellfish stocks (Hallegraeff, 1998;Caroppo et al, 1999;Velikova et al, 1999;Moncheva et al, 2001) are considered to be the primary cause of the increase. The increase in man-made sheltered waters, as in harbours, jetties, etc.…”

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confidence: 99%

Phytoplankton functional groups and harmful algae species in anthropogenically impacted waters of the NW Mediterranean Sea

Vila¹,

Masó²

2005

Sci. Mar.

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SUMMARY: Phytoplankton assemblages were analysed by multivariate analysis techniques in highly modified waterbodies (harbours) of the northwestern Mediterranean Sea over an annual cycle. The phytoplankton functional groups that characterise these anthropogenically impacted waters were identified and related to HAB events. Four functional groups can be distinguished from the analysis: (1) bloom-forming dinoflagellates, (2) winter diatoms, (3) summer-autumn diatoms, and (4) large dinoflagellates and elongated diatoms. The species that characterise these functional groups occurred at all sampling stations. Potentially harmful species are distributed through all the clusters. However, bloom-forming dinoflagellates occur particularly in large harbours and during summer months. The results indicate that: (1) functional groups indicate where and when there is a high risk of blooms, but they cannot determine the risk of a toxic or fish-killing event; and (2) large harbours in tideless seas must be considered as areas with a high risk of high-biomass bloom occurrences.Key words: phytoplankton assemblages, functional groups, toxic dinoflagellates, Mediterranean Sea, HAB. RESUMEN: GRUPOS FUNCIONALES DE FITOPLÁNCTON Y ESPECIES TÓXICAS O NOCIVAS EN AGUAS DEL MEDITERRANEO NORDOC-CIDENTAL IMPACTADAS ANTRÓPICAMENTE. -Se presentan los resultados de un analisis multivariante de asociaciones fitoplanctónicas en aguas confinadas (puertos) del Mediterráneo nordoccidental a lo largo de un ciclo anual. El objetivo del estudio es identificar los grupos funcionales de fitopláncton que caracterizan aguas impactadas por efectos antrópicos y determinar su relación con las incidencias de especies tóxicas o nocivas (HAB). Se han identificado cuatro grupos funcionales: (1) dinoflageados formadores de proliferaciones, (2) diatomeas de invierno, (3) diatomeas de verano-otoño, y (4) dinoflagelados y diatomeas de gran tamaño. En todas las estaciones muestreadas se detectan las especies que caracterizan los cuatro grupos funcionales. Sin embargo, los dinoflageados formadores de proliferaciones aparecen principalmente en puertos grandes y durante los meses de verano. Los resultados indican que: (1) Los grupos funcionales indican donde y cuando hay riesgo de proliferaciones, pero no pueden determinar el riesgo de un determinado evento tóxico. Y (2) los puertos grandes situados en mares con escasa amplitud mareal deben considerarse con un elevado riesgo de proliferaciones de elevada biomasa.

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Phytoplankton Blooms in Black Sea and Mediterranean Coastal Ecosystems Subjected to Anthropogenic Eutrophication: Similarities and Differences

Cited by 196 publications

References 23 publications

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

Phytoplankton community structure defined by key environmental variables in Tagus estuary, Portugal

Phytoplankton functional groups and harmful algae species in anthropogenically impacted waters of the NW Mediterranean Sea

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