Cristina Romera-Castillo

Cristina Romera-Castillo
Institut de Ciències del Mar · Department of Marine Biology and Oceanography

PhD

About

50
Publications
13,326
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Introduction
Cristina Romera-Castillo currently works at the Department of Marine Biology and Oceanography at Institut de Ciències del Mar-CSIC. Cristina does research in Chemical Oceangraphy, Microbiology, Marine Biology and Ecology.

Publications

Publications (50)
Article
Seagrass beds act as blue carbon sinks globally as they enhance the trapping of recalcitrant (i.e., low biodegradability) organic carbon in their sediments. Recent studies also show that the recalcitrant fraction of the dissolved organic carbon (DOC) pool in seawater has an important role as long-term carbon sequestration in oceans. Although seagra...
Article
Full-text available
Plastic in the ocean releases organic compounds that are able to enter the marine dissolved organic carbon pool and be utilized by heterotrophic bacteria. However, no information is known about which groups of bacteria are able to grow and degrade plastic leachates. Here we characterized a marine bacterial community from the NW Mediterranean Sea gr...
Article
Full-text available
Petrol-based plastic debris reaching the ocean releases dissolved organic carbon (DOC) and it can also leach fluorescent dissolved organic matter (FDOM). DOC is available to microbial uptake but the FDOM bioavailability has been scarcely studied. Although the most common plastic found in the ocean is petrol-based, the use of biodegradable plastic h...
Article
Full-text available
Plastic debris reaching the ocean is exponentially increasing in parallel with plastic production. Once into seawater, plastic starts to leach organic compounds that are presumably additives and plastic oligomers, and that process is enhanced by solar radiation. From previous studies with virgin plastic, it has been estimated that up to 23,600 metr...
Article
Full-text available
Plastic litter dispersed in the different environmental compartments represents one of the most concerning problems associated with human activities. Specifically, plastic particles in the micro and nano size scale are ubiquitous and represent a threat to human health and the environment. In the last few decades, a huge amount of research has been...
Article
Estuarine systems receive large amounts of organic matter that enhance the production of greenhouse gases (GHGs), such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Despite considerable research on GHGs and dissolved organic matter (DOM) distribution in estuaries, little is known about the linkage between these gases and DOM comp...
Data
Compilation of dissolved organic matter (DOM) data obtained from global ocean observations from 1994 to 2020 This compilation consists of measurements of dissolved organic matter (DOM) and other chemical and hydrographic parameters obtained during the global ocean observations from 1994-01-01 to 2019-12-31. Measurements of dissolved organic matter...
Article
Full-text available
Seafloor structures related to the emission of different fluids, such as submarine mud volcanoes (MVs), have been recently reported to largely contribute with dissolved organic matter (DOM) into the oceans. Submarine MVs are common structures in the Gulf of Cádiz. However, little is known about the biogeochemical processes that occur in these pecul...
Article
The Gulf of Cádiz, located in the Southern Iberian Atlantic Basin, connects the North Atlantic Ocean and the Mediterranean Sea and receives freshwater input from three main estuaries: Guadalquivir, Guadiana, and Tinto-Odiel. These estuaries differ in their hydrology, basin characteristic, and land use. One of them, Tinto-Odiel, is one of the most p...
Article
Full-text available
The Gulf of Cádiz (GoC) connects the Mediterranean Sea with the Atlantic Ocean through the Strait of Gibraltar. Particular hydrographic processes take place in the GoC, such as riverine discharges and surface circulation marked by wind-induced seasonal upwelling. Although physical processes have been widely studied, little is known about the biogeo...
Article
Although there are numerous studies concerning the occurrence of microplastics (MP) in the environment and its impact on the ecosystem, dissolved organic matter (DOM) leached from MP (MP-DOM) has received little attention and its characteristics have been rarely examined. It is presumed that the DOM leaching from plastics could be accelerated when...
Article
Full-text available
Most dissolved organic carbon (DOC) sequestered in the deep ocean has residence times of decades to thousands of years, with clear implications for climate regulation, though some net removal is typically observed with increasing water mass age. Here, a high‐quality‐high‐resolution data set has allowed us to identify net additions of recalcitrant D...
Presentation
Full-text available
The Gulf of Cádiz connects the North Atlantic Ocean and the Mediterranean Sea through the Strait of Gibraltar and receives freshwater input from three estuaries with very different chemical properties (Guadalquivir, Guadiana and Tinto-Odiel). Guadalquivir and Guadiana present high concentrations of dissolved organic matter (DOM, González-Ortegón et...
Article
Full-text available
Approximately 5.25 trillion plastic pieces are floating at the sea surface. The impact of plastic pollution on the lowest trophic levels of the food web, however, remains unknown. Here we show that plastics release dissolved organic carbon (DOC) into the ambient seawater stimulating the activity of heterotrophic microbes. Our estimates indicate tha...
Article
The antioxidant capacity and formation of photochemically produced reactive intermediates (RI) was studied for water samples collected from the Florida Everglades with different spatial (marsh versus estuarine) and temporal (wet versus dry season) characteristics. Measured RI included triplet excited states of dissolved organic matter (3DOM*), sing...
Article
Photolysis is a major removal pathway for the biogenic gas dimethylsulfide (DMS) in the oceans’ surface. Here we tested the hypothesis that apparent quantum yields (AQY) for DMS photolysis varied according to the quantity and quality of its photosensitizers, chiefly chromophoric dissolved organic matter (CDOM) and nitrate. AQY compiled from the lit...
Poster
Full-text available
Samples from the MALASPINA circumnavigation expedition (2010-2011) were collected to study the influence of microbial abundances in the distribution of the fluorescent dissolved organic matter (FDOM). The FDOM excitation-emission matrix (EEM) data, obtained using a Fluoromax-4 spectrofluorimeter, were examined with Parallel Factor Analysis (PARAFAC...
Article
Full-text available
The inventories of carbon residing in organic matter dissolved in the ocean [dissolved organic carbon (DOC)] and in the atmosphere as CO2 are of the same order of magnitude, such that small changes in the DOC pool could have important consequences in atmospheric carbon and thus climate. DOC in the global ocean is largely formed in the sunlit euphot...
Raw Data
Full-text available
Nature Communications 6:5986 doi: 10.1038/ncomms6986 (2015); Published January292015; Updated June152016 The original version of this Article failed to fully credit the use of the Ocean Data View software in figures 1, 2 and 3, which appears below: Schlitzer, R., Ocean Data View, http://odv.awi.de, 2016.
Article
Fluorescent dissolved organic matter (FDOM) in open surface waters (< 200 m) of the Atlantic, Pacific, and Indian oceans was analysed by excitation-emission matrix (EEM) spectroscopy and parallel factor analysis (PARAFAC). A four-component PARAFAC model was fit to the EEMs, which included two humic- (C1 and C2) and two amino acid-like (C3 and C4) c...
Article
Free radicals are produced in aquatic environments through photochemical reactions. They can affect the concentration and composition of organic matter and have negative effects on aquatic organisms. Free radical scavengers (antioxidants) can remove these highly reactive species from the media. Some dissolved organic matter (DOM) constituents are w...
Article
The omnipresence of chromophoric dissolved organic matter (CDOM) in the open ocean enables its use as a tracer for biochemical processes throughout the global overturning circulation. We made an inventory of CDOM optical properties, ideal water age (τ) and apparent oxygen utilization (AOU) along the Atlantic, Indian and Pacific Ocean waters sampled...
Article
Full-text available
Marine dissolved organic matter (DOM) is one of the largest reservoirs of reduced carbon on Earth. In the dark ocean (4200 m), most of this carbon is refractory DOM. This refractory DOM, largely produced during microbial mineralization of organic matter, includes humic-like substances generated in situ and detectable by fluorescence spectroscopy. H...
Article
Full-text available
The distributions of humic-like fluorescent dissolved organic matter (at excitation/emission wavelengths of 340/440 nm, F(340/440)) and apparent oxygen utilization (AOU) are determined from water samples taken at 27 stations along 7.5°N, in the equatorial Atlantic Ocean. The relationship between F(340/440) and AOU is evaluated. The influence of wat...
Article
Surface freshwater samples from Everglades National Park, Florida, were used to investigate the size distributions of natural dissolved organic matter (DOM) and associated fluorescence characteristics along the molecular weight continuum. Samples were fractionated using size exclusion chromatography (SEC) and characterized by spectroscopic means, i...
Article
Full-text available
Natural dissolved organic matter (DOM) is the major absorber of sunlight in most natural waters and a critical component of carbon cycling in aquatic systems. The combined effect of light absorbance properties and related photo-production of reactive species are essential in determining the reactivity of DOM. Optical properties and in particular ex...
Article
Full-text available
Despite representing only a small fraction of the ocean’s dissolved organic matter pool, dissolved free amino acids (DFAA) have high turnover rates and are major nitrogen and carbon sources for bacterioplankton. Both phytoplankton and bacterioplankton assimilate and release DFAA, but their consumption and production are difficult to quantify in nat...
Article
Full-text available
We investigated the short-term effects of variable solar irradiance and spectrum on the gross biological production of dimethylsulfide (DMS), a trace gas with potential climatic effects, in eight experiments performed at different times of the year in a northwest Mediterranean coastal site. Experimentally determined net community DMS production, DM...
Poster
Full-text available
The fluorescence signal of humic-like compounds at Excitation/Emission 340/440 nm wavelengths, FDOM(340/440), was used as a proxy of nonbiodegradable material, and AOU (apparent oxygen utilization) was used as a proxy of biological activity. Statistical analyses were done to examine the FDOM variability in relation to hydrographic properties (Tempe...
Article
Full-text available
Bacterial community activity and structure are thought to be directly or indirectly related to phytoplankton development and, in particular, to the phytoplankton species dominating specific algal blooms. To test this hypothesis, we performed a mesocosm experiment designed to generate blooms of different types of phytoplankton through the additions...
Article
A harmonic analysis of three years of data collected with fortnight to monthly frequency in the oligotrophic Bay of Blanes (NW Mediterranean) revealed that the water column mixing-stratification cycle dictated the seasonal build-up of the bulk and different coloured fractions of dissolved organic matter (DOM). Dissolved organic carbon (DOC) accumul...
Article
Full-text available
An understanding of the distribution of colored dissolved organic matter (CDOM) in the oceans and its role in the global carbon cycle requires a better knowledge of the colored materials produced and consumed by marine phytoplankton and bacteria. In this work, we examined the net uptake and release of CDOM by a natural bacterial community growing o...
Article
The optical properties of coloured dissolved organic matter (CDOM) – absorption coefficient, induced fluorescence, and fluorescence quantum yield – were determined in the coastal eutrophic system of the Ría de Vigo (NW Spain) under two contrasting situations: a downwelling event in September 2006 and an upwelling event in June 2007. Significantly d...
Conference Paper
The comparison of satellite ocean colour image studies and hydrographic data has shown a significant relationship between Sea Surface Salinity (SSS) and the absorption coefficient for dissolved and detritus materials. Here, we use this relationship to identify the signal of the Amazon River plume. We collected water samples from the MOC2-Equatorial...
Article
Incubation experiments with axenic cultures of four common phytoplankton species of the genera Chaetoceros, Skeletonema, Prorocentrum, and Micromonas were performed to test for the production of fluorescent dissolved organic matter (FDOM) by marine phytoplankton. Our results prove that the four species exuded both fluorescent protein-like and marin...
Article
Full-text available
The Mediterranean coast receives large inputs of dust with a potential fertilization effect. We evaluated the effect of a wet dust deposition event on microbial abundance and activity, community structure and metabolic balance. Dust collected during a dust storm event was added to a series of microcosms. We added a realistic concentration (0.05 g L...
Article
Cinnamtannin B-1, a natural A-type proanthocyanidin recently identified as a radical scavenger component of Laurus nobilis L., exerts antiaggregant and antiapoptotic effects in human platelets. Here, we have investigated the intracellular mechanisms involved in the antiaggregant effects of cinnamtannin B-1. Cinnamtannin B-1 showed a greater free ra...
Article
Full-text available
Proanthocyanidins, such as cinnamtannin B-1, are polyphenolic compounds with antioxidant activity that induce apoptosis in a number of tumoral cells. We have now investigated the pro- or anti-apoptotic effects of cinnamtannin B-1 in human platelets. Platelet stimulation with thrombin induced cellular apoptosis, as detected by phosphatidylserine exp...

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Projects

Projects (3)
Project
The aim of ANIMA is to quantify and characterize the atmospheric inputs of organic matter and airborne microorganisms and to evaluate their impact in the frame of the NW Mediterranean marine ecosystem. The overriding hypothesis of ANIMA is that the larger proportion of organic matter in anthropogenic aerosols preferentially stimulates the heterotrophic bacteria in the water and changes microbial community composition. In future scenarios of the Mediterranean, aerosol deposition should have an even larger impact on marine ecosystems as aerosol loads, both natural and anthropogenic, are increasing while the mixed layer depth is shallowing. Thus, ANIMA will help understand current and future ocean responses to aerosol deposition. anima.icm.csic.es www.facebook.com/atmosphere.and.ocean
Project
Photolysis is the second more important removal pathway for marine DMS. This project aims at understanding the environmental drivers of DMS photolysis through the synthesis of existing data and the acquisition of new measurements. This will enable modeling DMS photolysis rates using remote sensing data and improve the parameterization of DMS photolysis in prognostic models.