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Publications (92)
COVID-19 has led to global population lockdowns that have had indirect effects on terrestrial and marine fauna, yet little is known on their effects on marine planktonic communities. We analysed the effect of the spring 2020 lockdown in a marine coastal area in Blanes Bay, NW Mediterranean. We compared a set of 23 oceanographic, microbial and bioge...
The bathypelagic ocean is one of the largest ecosystems on Earth, and sustains half of the ocean's microbial activity. This microbial activity strongly relies on surface-derived particles, but there is growing evidence that the carbon released through solubilisation of these particles may not be sufficient to meet the energy demands of deep ocean p...
Upon phosphorus (P) deficiency, marine phytoplankton reduce their requirements for P by replacing membrane phospholipids with alternative non-phosphorus lipids. It was very recently demonstrated that a SAR11 isolate also shares this capability when phosphate starved in culture. Yet, the extent to which this process occurs in other marine heterotrop...
Species interaction networks are shaped by abiotic and biotic factors. Here, as part of the Tara Oceans project, we studied the photic zone interactome using environmental factors and organismal abundance profiles and found that environmental factors are incomplete predictors of community structure. We found associations across plankton functional...
The heterotrophic bacterial community of the Eastern Mediterranean Sea is believed to be limited by phosphorus (P) availability. This observation assumes that all bacterial groups are equally limited, something that has not been hitherto examined. To test this hypothesis, we performed nutrient addition experiments and investigated the response of p...
The use of inorganic phosphate (Pi) and dissolved organic phosphorus (DOP) by different bacterial groups was studied in experimental mesocosms of P-starved eastern Mediterranean waters in the absence (control mesocosms) and presence of additional Pi (P-amended mesocosms). The low Pi turnover times in the control mesocosms and the increase in hetero...
Marine microbes are adapted to surviving in a variable phosphorus (P) environment. This adaptation frequently involves the presence of periplasmic or cell membrane-associated enzymes that enable them access to alternative sources of P when phosphate is depleted. In a recent study we identified the phosphatase PhoX as an enzyme that may be essential...
Growth is one of the basic attributes of any living organism. Surprisingly, the growth rates of marine bacterioplankton are only poorly known. Current data suggest that marine bacteria grow relatively slowly, having generation times of several days. However, some bacterial groups, such as the aerobic anoxygenic phototrophic (AAP) bacteria, have bee...
Phosphorus (P) is a vital nutrient for all living organisms and may control the growth of bacteria in the ocean. Bacteria induce alkaline phosphatases when inorganic phosphate (P(i)) is insufficient to meet their P-requirements, and therefore bulk alkaline phosphatase activity measurements have been used to assess the P-status of microbial assembla...
Microbial ectoenzyme activities in aquatic environments are important determinants of polymer hydrolysis and indicators of the state of microbial carbon, nitrogen, and phosphorus nutrition. Marine ectoenzymes are found on the cell surface or in the periplasmic space of gram-negative heterotrophic bacteria. Phosphatases, which remove phosphate group...
The uptake of dissolved nitrogen by different assemblages of phytoplankton was determined during 4 seasonal surveys carried out in the northwest sector of the Alboran Sea. The study area was characterized by stratification of the water column from spring to autumn, leading to very low nutrient concentrations in the euphotic zone; in particular, nit...
The uptake of dissolved nitrogen by different assemblages of phytoplankton was determined during 4 seasonal surveys carried out in the northwest sector of the Alboran Sea. The study area was characterised by stratification of the water column from spring to autumn, leading to very low nutrient concentrations in the euphotic zone; in particular nitr...
The assessment of the in situ phosphorus (P) status of marine bacteria will help us understand the P cycle in the ocean and its effect on bacterial ecology and diversity. A possible marker of P status is phoX, a recently discovered, widespread phosphatase gene in marine bacteria. This gene has been shown to encode for the major P-regulated phosphat...
The changes in the phytoplankton absorption properties during a diurnal cycle were investigated at one station located in the north-western area of the Alborán Sea. The experiment was performed in spring when the water column was strongly stratified. This hydrological situation permitted the establishment of a deep chlorophyll a (chl a) fluorescenc...
We examined the potential response of Southern Ocean pelagic ecosystems to warming through changes in total primary production (particulate plus dissolved = PPP + DPP) and bacterial production (BP), determined simultaneously at ambient temperature ( $-1.4 to 0.4\textdegree C$ ) and at $2\textdegree C$ in eight experiments performed near the Antarct...
Respiratory electron transport system (ETS) activity were measured in plankton samples (<200 µm) collected in the NW Alboran Sea. Sampling was carried out during seasonal cruises (summer and autumn 2003 and winter and spring 2004) in 12 stations located in transects off the coast of Malaga (southern Spain). This work reports for the first time seas...
The seasonal dynamics of inorganic nutrients and phytoplankton biomass (chlorophyll a), and its relation with hydrological features, was studied in the NW Alboran Sea during four cruises conducted in February, April, July and October 2002. In the upper layers, the seasonal pattern of nutrient concentrations and their molar ratios (N:Si:P) was great...
Temporal variability (seasonal and inter-annual) in the assembly of phytoplankton communities from the northern Alborán Sea was investigated. For this purpose, the taxonomic composition of the micro- and nano-phytoplankton communities at three fixed stations was determined every three months from 1994 to 2002. A total of 357 different taxa were ide...
The aim of this work is to study the seasonal dynamics and the interannual variability of dissolved inorganic nitrogen DIN (NO − 3 + NO − 2) and dissolved inorganic phosphorus DIP (PO 3− 4) in the continental margin of the northwestern Alboran Sea and their relationships with the hydrological features. The sampling was carried out during 12 cruises...
We present the results of our physical oceanographic observations for the first 10 years of the Ecomálaga Project, including the statistical tools used, and our principal findings. Most noteworthy are the spatial descriptions of temperature and salinity fields over the seasonal cycle; a seasonal cycle for salinity was observed. we have confirmed it...
Measurements of potential enzyme activities are usually carried out to compare enzymatic activity between different systems and minimise the effect of product inhibition or substrate depletion during the assay. There is a general practice of estimating potential alkaline phosphatase activity (APA) using single-substrate addition in excess of satura...
The enzymatic activity of alkaline phosphatase (APA) was studied in the transition zone between the African upwelling system and the open ocean waters of the Canary Islands region. This region is recurrently dominated by the presence of upwelling filaments that may transport nutrient-enriched waters out into the open ocean before nutrients become e...
Alkaline phosphatase (AP) kinetic experiments were performed in a broad range of trophic conditions in the transition zone between the North African upwelling and the open ocean, in order to investigate the effect of nutrient richness on kinetic parameters. Turnover times decreased from 224 h in the open ocean to 13 h in the upwelling region. K+ S-...
Temperature time series from 1992 to 2001 (ECOMÁLAGA Project), show an intense warming trend in deep layers (200m depth) of Málaga Bay (0.02°C/yr). Data from MEDATLAS show that this trend is 0.005°C/yr throughout the whole century. Another striking change in Málaga Bay is the disappearance of the cold Western Intermediate Water (WIW) after 1992. Th...
The Gulf of Cádiz is an area of transition for Atlantic waters inflowing the Mediter- ranean and Mediterranean waters inflowing the Atlantic. Despite the potentials that this exchange dynamics can encapsulate, little is known on the biological response to the physical forcing in surface waters of the area. In this presentation we show a set of prel...
Photosynthetic acclimation of Ulva rigida and U. rotundata arranged in canopies was assessed by combining laboratory and field experiments. Changes in the light field caused by the self-shading of Ulva thalli resulted in an instantaneous effect on the photosynthetic parameters. Photosynthetic efficiency decreased from the top of the canopy to the b...
