Short-term variability of photosynthetic parameters and particulate and dissolved primary production in the Alboran Sea (SW Mediterranean)

Morán, Xosé Anxelu G.; Estrada, Marta

doi:10.3354/meps212053

Cited by 97 publications

(76 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Any process inhibiting cell growth and division but still permitting carbon assimilation may result in an overflow of photoassimilated carbon, which might uncouple POCp and DOCp rates and increase the relative DOCp (Mague et al 1980, Wood & Van Valen 1990. Such an enhanced relative DOCp has been repeatedly ob served under very low light conditions (Thomas 1971, Berman & Holm-Hansen 1974, Morán & Estrada 2001, Marañón et al 2004, and was attributed by some authors to the presence of senescent or light -limited cells. DOCp could be also en hanced at low light levels as a consequence of the inability of cells to proceed with macromolecular synthesis at the same rates as carbon fixation, which would lead to an accumulation of photosynthates that would be released to the external environment (Harding et al 1985, Marañón & González 1997.…”

Section: Differences In Planktonic Carbon Dynamicsmentioning

confidence: 99%

“…Some evidence suggests that DOC release is essentially a physiological process that can be enhanced under suboptimal light levels or under nutrient limitation conditions (Zlotnik & Dubinsky 1989, Morán & Estrada 2001, Marañón et al 2004, López-Sandoval et al 2011. On the other hand, some other studies suggest that part of the recently-fixed photosynthetic carbon might be indirectly released in dissolved form as a consequence of trophic processes, such as grazing or cell lysis, ending in cell breakage (Nagata 2000, Teira et al 2001a.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Teira

Hernando-Morales²,

Fernández³

et al. 2015

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We simultaneously studied microbial-mediated carbon fluxes at 2 contrasting sites within the coastal upwelling system off Galicia, near A Coruña and Vigo, Spain, over an annual cycle in order to compare the fraction of primary production released as dissolved organic carbon (DOC) and the degree of coupling between bacteria and phytoplankton. A significant fraction of primary production was released as DOC at both sites, averaging ~30%. DOC release ac counted for, on average, 30% of the total bacterial carbon demand, which is indicative of a moderate trophic dependence of bacteria on phytoplankton in these coastal ecosystems. Nevertheless, differences in hydrographic conditions associated with stronger upwelling pulses off Vigo, and deeper upper mixed layers during the downwelling period off A Coruña, led to significant differences in phytoplankton dynamics and the subsequent direct coupling with heterotrophic bacteria. Strong direct coupling between phytoplankton extracellular release and bacterial production (BP) was found off Vigo, which could be related to the quality of the DOC produced by actively growing phytoplankton. By contrast, DOC release and BP rates were decoupled off A Coruña, likely due to unaccounted DOC associated with indirect trophic processes or to the low availability of freshly produced exudates associated with overflow or photoinhibition mechanisms.

show abstract

Section: Differences In Planktonic Carbon Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Teira

Hernando-Morales²,

Fernández³

et al. 2015

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 1 (top), Atlantic water enters the investigated area at Gibraltar and proceeds eastward as Modified Atlantic Water (MAW, S < 36.5 and T > 20 °C, Millot, 1999). It continues as a jet along the Spanish coast following an anticyclonic circulation, gradually mixing with the resident waters and producing subsequent mesoscale structures (Rodriguez et al, 1998;Morán & Estrada, 2001). It then turns southward as the Almeria-Oran jet, lying on top of the Levantine Intermediate Water (LIW, S > 37.5 and T < 15°C, Millot, 1999).…”

Section: Introductionmentioning

confidence: 99%

Fibrocapsa japonica (Raphidophyceae) occurrence and ecological features within the phytoplankton assemblage of a cyclonic eddy, offshore the Eastern Alboran Sea.

et al. 2014

View full text Add to dashboard Cite

The Raphidophycean Fibrocapsa japonica Toriumi & Takano was detected for the first time offshore in the Eastern Alboran Sea (Western Mediterranean) in October 2006. Its distribution appeared very localised and atypical, as it was abundant only in the open waters of a cyclonic eddy. Microscope counts of the natural phytoplankton assemblages revealed that F. japonica was dominant in the microplankton, together with Dinophyceae, within and below the cyclonic nutrient-rich dome (25 - 30 m). Bacillariophyceae were the primary microplanktonic fraction in only a few samples. Moderately high abundances of F. japonica (maximum of 60 cells ml-1), with preliminary cysts and many cells aggregated in mucous nets, indicated a senescent phase. We also suggest a Mediterranean origin for this species. This was confirmed by molecular identification and by a water temperature of 15 °C, which could have favoured pre-cyst formation. Finally, we hypothesise that F. japonica, which is generally a coastal species, could have a coastal origin. Since F. japonica was confined to the cyclonic waters, which typically derive from coastal waters, it was collected at a depth of 40-60 m at the coastal sites and it is generally a coastal species, we hypothesise that it could have a coastal origin and it was entrapped by the cyclonic eddy, which could have carried offshore this harmful species.

show abstract

“…She also helped to quantify the importance of plankton activity in biogeochemical fluxes under different conditions of nutrient and light availability. To address these questions she used a variety of approaches, ranging from experimental work (Estrada et al, 2003 to field work (Estrada 1979, and different biogeochemical methodologies: phosphorus nutrient deficient inputs (Berdalet et al 1996), biochemical relations with primary production (Berdalet et al 1993b, CO 2 links with frontal zones (Delgado and Estrada 1994), relationships of dissolved organic carbon with phytoplankton (Estrada and Morán 1996), DNA relative to biomass , excess of carbohydrate synthesis (Fraga et al 1999), variability of photosynthesis parameters (Morán and Estrada 2001) and enzyme kinetics principles (Packard et al 2004). …”

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

View full text Add to dashboard Cite

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...

show abstract

Short-term variability of photosynthetic parameters and particulate and dissolved primary production in the Alboran Sea (SW Mediterranean)

Cited by 97 publications

References 57 publications

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Fibrocapsa japonica (Raphidophyceae) occurrence and ecological features within the phytoplankton assemblage of a cyclonic eddy, offshore the Eastern Alboran Sea.

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

Contact Info

Product

Resources

About