Open sea hydrographic forcing of nutrient and phytoplankton dynamics in a Mediterranean coastal ecosystem

Arı́n, Laura; Guillén, Jorge; Segura-Noguera, Mariona; Estrada, Marta

doi:10.1016/j.ecss.2013.08.018

Cited by 34 publications

(43 citation statements)

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“…Margalef 1998, Geider andLaRoche 2002), with a theoretical optimal N:P stoichiometry between 8.2 and 45.0 (Klausmeier et al 2004). For example, diatoms, which dominate the phytoplankton community in the NW Mediterranean Sea in winter (Estrada 1999, Arin et al 2013, are able to store nitrate, as well as phosphate, inside intracellular vacuoles, allowing them to continue growing for several generations after the nutrients are depleted (Rosen andLowe 1984, Margalef 1998). Also, diatoms could store nitrate as pigments (Rosen and Lowe 1984), and since each chlorophyll molecule contain four atoms of N, the resulting N:P ratio would be higher.…”

Section: Nutrient Limitation In the Catalan Seamentioning

confidence: 99%

The biogeochemistry of nutrients, dissolved oxygen and chlorophyll <em>a</em> in the Catalan Sea (NW Mediterranean Sea)

Segura-Noguera

Cruzado

Blasco³

2016

Sci. Mar.

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Summary:Reference depth profiles of dissolved inorganic nutrients, dissolved oxygen and chlorophyll a are described for the Catalan Sea using quality controlled data. Phosphate, nitrate and silicate show typical nutrient profiles, with nutriclines at different depths. Maximums of nitrite, dissolved oxygen and occasionally ammonium are found within the photic zone, close to the deep chlorophyll maximum. In intermediate waters we found a minimum of dissolved oxygen coincident with maximum concentrations of phosphate and nitrate. Ammonium concentration is unexpectedly high in the mesopelagic zone, where there are still measurable nitrite concentrations. The origin of such high ammonium and nitrite concentrations remains unclear. We also identify and describe anomalous data and profiles resulting from eutrophication, western Mediterranean Deep Water formation and dense shelf water cascading. The N:P ratio in deep waters is 22.4, which indicates P limitation relative to the Redfield ratio. However, the N:P ratio above the deep chlorophyll maximum in stratified surface waters is <4 (<8 including ammonium). The depth profiles of key biogeochemical variables described in this study will be a useful reference for future studies in the Catalan Sea (NW Mediterranean Sea) in order to validate data sampled in this area, to identify anomalous processes, and to study the evolution of the ecosystem following the undergoing global change.Keywords: dissolved inorganic nutrients; dissolved oxygen; chlorophyll a; stoichiometry; P limitation; NW Mediterranean Sea; Catalan Sea Biogeoquímica de los nutrientes, oxígeno disuelto y clorofila a en el mar catalán (mar Mediterráneo noroccidental).Resumen: En este artículo se describen perfiles de profundidad de referencia para nutrientes inorgánicos disueltos, oxígeno disuelto y clorofila a en el Mar Catalán. Estos perfiles se han creado usando datos que han superado un control de calidad. Los perfiles de fosfato, nitrato y silicato son típicos de nutrientes, pero las nutriclinas se encuentran en diferentes profundidades. En la zona fótica, cerca del máximo profundo de clorofila, hay concentraciones máximas de nitrito, oxígeno disuelto y, ocasionalmente, amonio. En aguas intermedias se han detectado concentraciones mínimas de oxígeno disuelto coincidentes con concentraciones máximas de fosfato y nitrato. En la zona mesopelágica se encuentran concentraciones inesperadamente altas de amonio, así como concentraciones de nitrito por encima del límite de detección, cuyo origen se desconoce. En el presente estudio también se identifican y describen datos y perfiles anómalos resultantes de procesos de eutrofización, de formación de agua mediterránea profunda (WMDW), o de cascadas de agua densa (DSWC). La relación N:P en aguas profundas es 22.4, indicando limitación por fósforo relativo a la relación de Redfield. No obstante, la relación N:P por encima del máximo profundo de clorofila en aguas estratificadas es menor que 4 (menor que 8 si el amonio se incluye en la relación). Los perfiles de profun...

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Section: Nutrient Limitation In the Catalan Seamentioning

confidence: 99%

The biogeochemistry of nutrients, dissolved oxygen and chlorophyll <em>a</em> in the Catalan Sea (NW Mediterranean Sea)

Segura-Noguera

Cruzado

Blasco³

2016

Sci. Mar.

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“…The highest interannual variability corresponds to WBs situated inside little bays (C02, C04) or to WBs located southward of river mouths (C08, C12, C15, and C21). Differences in river discharges associated to rainy periods [42][43][44] can modify the assemblages close to the inflows. Unexpected strong storms [45][46][47], differences in nutrients by upwelling processes and river discharges [43,48,49], salinity changes [50,51], temperature variability [50,52], and hydroclimatic variability [53][54][55], among other factors, have also been reported as major drivers for Mediterranean marine ecosystems and may be also affecting the interannual variability on the composition and development of upper infralittoral assemblages on rocky shores, and thus, they may be shaping the assessment of the water quality using CARLIT.…”

Section: Es Gironamentioning

confidence: 99%

Environmental Quality of Catalan Coastal Waters Based on Macroalgae: The Interannual Variability of CARLIT Index and Its Ability to Detect Changes in Anthropogenic Pressures over Time

Torras

Pinedo

García

et al. 2015

The Handbook of Environmental Chemistry

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CARLIT is a Water Framework Directive-compliant methodology permitting a rapid assessment of water quality using rocky-shore macroalgae as biological quality elements. Here we present the water quality assessment of 32 coastal water bodies of Catalonia (Northwestern Mediterranean) during a period of 14 years (1999-2012) applying CARLIT. The averaged ecological status of the water bodies ranges between high and poor and the Ecological Quality Ratio shows a significant negative relationship with a modified LUSI index, thus providing further evidence on the utility of CARLIT to detect anthropogenic pressures. The lowest interannual variability in water quality was found in water bodies having most of their shore covered by natural rocks, while the highest variability was observed in water bodies situated in semi-confined environments or located close to freshwater discharges. In spite of the multiple advantages of CARLIT as a monitoring methodology, it can show strong disagreements in water quality assessment with other methodologies using other biological quality elements (i.e., macroinvertebrates). These discrepancies mainly occur in water bodies with reduced extension of rocky shores, questioning the use of CARLIT in these situations.

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“…An important finding derived from these studies was that coastal fertilization by offshore waters during atypical weather conditions (cold and dry winters) may be equal to, or more important than, continental fertilization and may introduce organisms typically thriving in open oceanic waters to coastal waters (Arin et al 2013). In this situation, some of these taxa, in particular the foam-forming Phaeocystis sp., can proliferate, causing a considerable deterioration of coastal water quality (Arin et al 2014).…”

Section: Structure Of Phytoplankton Communi-ties Related To Environmementioning

confidence: 99%

“…In numerous field studies, she showed her interest in framing biological variability with physical processes. Here we cite some papers from her inspections in relation to upwelling (Estrada 1974(Estrada , 1978(Estrada , 1991, coastal processes , 1985, fronts (Estrada 1991, Estrada andMargalef 1988), stratification , Brink et al 1995, eddy processes (Granata et al 2004) and other physical processes (Morán et al 1999, Llebot et al 2011, Arin et al 2013. She also helped to quantify the importance of plankton activity in biogeochemical fluxes under different conditions of nutrient and light availability.…”

Section: Combining Different Approaches To Build a Reliable Conceptuamentioning

confidence: 99%

The ecology of plankton in biological oceanography: a tribute to Marta Estrada’s task

et al. 2016

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Summary:Plankton ecology has been the object of intense research and progress in the last few decades. This has been partly due to technological advances that have facilitated the multidisciplinary and high-resolution sampling of ecosystems and improved experimentation and analytical methodologies, and to sophisticated modelling. In addition, exceptional researchers have had the vision to integrate all these innovative tools to form a solid theoretical background in ecology. Here we provide an overview of the outstanding research work conducted by Professor Marta Estrada and her pioneering contribution to different areas of research in the last four decades. Her research in biological oceanography has mainly focussed on phytoplankton ecology, taxonomy and physiology, the functional structure of plankton communities, and physical and biological interactions in marine ecosystems. She has combined a variety of field and laboratory approaches and methodologies, from microscopy to satellite observations, including in-depth statistical data analysis and modelling. She has been a reference for scientists all over the world. Here, her contributions to plankton ecology are summarized by some of her students and closest collaborators, who had the privilege to share their science and everyday experiences with her.Keywords: phytoplankton ecology; taxonomy; functional structure of plankton communities; physical-biological interactions.La ecología del plancton en la oceanografía biológica: un homenaje a la labor de Marta Estrada Resumen: La ecología del plancton ha experimentado una intensa investigación y progreso en las últimas décadas. Esta se ha debido, en parte, a los avances tecnológicos que han facilitado la toma de muestras multidisciplinar y de alta resolución de los ecosistemas, la mejora de la experimentación y metodologías analíticas y el modelado matemático/numérico. El papel de investigadores excepcionales que han tenido la visión de integrar todas estas herramientas innovadoras a una sólida formación teórica en la ecología ha sido clave en este avance. A continuación hemos elaborado un resumen de la tarea de investigación llevada a cabo por la profesora Marta Estrada y su contribución pionera a diferentes áreas de investigación en las últimas cuatro décadas. Su investigación, en el marco de la oceanografía biológica, se ha centrado principalmente en la ecología del fitoplancton, su taxonomía y fisiología, la estructura funcional de las comunidades de plancton y las interacciones físicas y biológicas en los ecosistemas marinos. Ha combinado una variedad de enfoques y metodologías de campo y de laboratorio, desde observaciones por satélite, hasta el análisis en profundidad de datos estadísticos y el uso del modelado tanto analítico como numérico. La profesora Estrada ha sido una referencia para los científicos alrededor del mundo. Aquí, su contribución a la ecología del plancton la resumen algunos de sus alumnos y colaboradores más cercanos que han tenido el privilegio de compartir ciencia y vivencias con ella.Pa...

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Open sea hydrographic forcing of nutrient and phytoplankton dynamics in a Mediterranean coastal ecosystem

Cited by 34 publications

References 32 publications

The biogeochemistry of nutrients, dissolved oxygen and chlorophyll <em>a</em> in the Catalan Sea (NW Mediterranean Sea)

The biogeochemistry of nutrients, dissolved oxygen and chlorophyll <em>a</em> in the Catalan Sea (NW Mediterranean Sea)

Environmental Quality of Catalan Coastal Waters Based on Macroalgae: The Interannual Variability of CARLIT Index and Its Ability to Detect Changes in Anthropogenic Pressures over Time

The ecology of plankton in biological oceanography: a tribute to Marta Estrada’s task

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