A5091331084- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Marine Biology and Ecology Research
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Echinoderm biology and ecology
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Water Quality and Pollution Assessment
- Aeolian processes and effects
- Odor and Emission Control Technologies
- Air Quality Monitoring and Forecasting
- Wastewater Treatment and Nitrogen Removal
- Marine and fisheries research
- Genomics and Phylogenetic Studies
- Atmospheric aerosols and clouds
- Coastal and Marine Management
- Environmental DNA in Biodiversity Studies
- Oceanographic and Atmospheric Processes
- Aquatic life and conservation
Universidad de Granada
2016-2025
Scripps Institution of Oceanography
2014
Pacific Biosciences (United States)
2014
University of Hawaiʻi at Mānoa
2014
University of Hawaii System
2014
Laboratoire d’Océanographie de Villefranche
2014
University of Virginia
2014
Ecologie Microbienne Lyon
2014
Sorbonne Université
2014
Laboratoire de Biologie du Développement de Villefranche-sur-Mer
2014
Marine dissolved organic matter (DOM) is one of the largest reservoirs reduced carbon on Earth. In dark ocean (>200 m), most this refractory DOM. This DOM, largely produced during microbial mineralization matter, includes humic-like substances generated in situ and detectable by fluorescence spectroscopy. Here we show two ubiquitous fluorophores with turnover times 435±41 610±55 years, which persist significantly longer than ~350 years that global takes to renew. parallel, decay a...
With the advent of DNA-based molecular technologies, microbial ecologists now have tools to test whether general ecological patterns apply microorganisms. In this study, we selected 11 high-mountain lakes from Sierra Nevada (Spain) predictions island-biogeography theory in relation ecosystem size and isolation, assess influence other factors (i.e., productivity, resource richness, biotic interactions) on bacterial community structure. Bacterial operational taxonomic units (OTUs), generated...
We quantified dry and wet deposition of dust, nitrogen, phosphorus over the southwest Mediterranean region (Sierra Nevada, Spain) assessed its effects on nutrient status chlorophyll a (Chl a) concentration in two high mountain lakes. Atmospheric particulate matter (PM) total (TP) were mainly associated with dryfall showed seasonal pattern similar to that reported for Saharan dust export toward region, maxima during spring summer. In contrast, nitrogen (TN) was related rainfall did not follow...
Remote lakes are usually unaffected by direct human influence, yet they receive inputs of atmospheric pollutants, dust, and other aerosols, both inorganic organic. In remote, alpine lakes, these may influence the pool dissolved organic matter, a critical constituent for biogeochemical functioning aquatic ecosystems. Here, to assess this we evaluate factors related aerosol deposition, climate, catchment properties, microbial constituents in global dataset 86 polar lakes. We show significant...
We have analysed the diversity of bacteria, which grow after addition concentrated airborne particles and desert dust in different microcosms combinations with water samples from oligotrophic alpine lakes. used, on one hand, bacteria transported by an African plume collected a high mountain area central Pyrenees (Spain). On other we Mauritania (c. 3000 km distance, few days estimated journey), known source region for storms West Africa, originates many plumes landing Europe. In all...
The diversity of airborne microorganisms that potentially reach aquatic ecosystems during rain events is poorly explored. Here, we used a culture-independent approach to characterize bacterial assemblages with and without Saharan dust influence arriving high mountain lake in the Austrian Alps. Bacterial assemblage composition differed significantly between samples influence. Although alpha indices were within same range both sample categories, Atlantic or continental origins dominated by...
We assessed the effects of Saharan dust inputs particulate matter (PM), total phosphorus (TP), nitrogen, and water soluble organic carbon (WSOC) on bacterial abundance (BA) in two alpine lakes reservoirs Mediterranean region. also experimentally activity community composition explored presence airborne bacteria. found synchronous BA dynamics at least one study years for each corresponding pair ecosystems, suggesting an external control. The link between PM, WSOC, or TP occurred only those...
Chromophoric dissolved organic matter (CDOM), the optically active fraction of matter, is primarily generated by pelagic organisms in open ocean. In this study, we experimentally determined quantity and spectral quality CDOM bacterioplankton using two different substrates (with without photoproducts) Antarctic krill Euphausia superba evaluated their potential contributions to dynamics peninsular region Southern Ocean. was bacteria all experiments, presence photoproducts influenced both...
Abstract The omnipresence of chromophoric dissolved organic matter (CDOM) in the open ocean enables its use as a tracer for biochemical processes throughout global overturning circulation. We made an inventory CDOM optical properties, ideal water age ( τ ), and apparent oxygen utilization (AOU) along Atlantic, Indian, Pacific Ocean waters sampled during Malaspina 2010 expedition. A mass analysis was applied to obtain intrinsic, hereinafter archetypal, values , AOU, rate (OUR), absorption...
Deep ocean microbial communities rely on the organic carbon produced in sunlit ocean, yet it remains unknown whether surface processes determine assembly and function of bathypelagic prokaryotes to a larger extent than deep-sea physicochemical conditions. Here, we explored variations phytoplankton assemblages across Atlantic, Pacific Indian stations can explain structural changes (ca. 4,000 m) free-living particle-attached prokaryotic (characterized through 16S rRNA gene sequencing), as well...
Abstract. Transparent exopolymer particles (TEP) are the most ubiquitous gel in ocean and form abiotically from dissolved precursors. Although these can accumulate at surface, being thus exposed to intense sunlight, role of solar radiation for assembly degradation TEP is unknown. In this study, we experimentally determined effects visible ultraviolet B (UVB) on (1) (photolysis experiments), (2) polymers (photoinhibition experiments) (3) release by microorganisms. Solar radiation,...
We studied if the presence of Saharan dust intrusions and rains modify chemical signature wet dry deposition in southern Iberian Peninsula. have sorted 109 sampling weeks by (rainy weeks) or absence (dry rain occurrence not intrusions. Dry dominated delivery particulate material (PM), total phosphorus (TP), soluble reactive (SRP), Ca2+, Mg2+ K+, whereas Na+, nitrogen, NO 3 – SO 4 . In weeks, lead to higher inputs PM, TP, SRP, K+ deposition. Conversely, rainy there were no differences mean...
Abstract 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 parallel factor analysis (PARAFAC). A four‐component PARAFAC model fit to EEMs, which included two humic‐ (C1 C2) amino acid‐like (C3 C4) components previously identified ocean waters. Generalized‐additive models (GAMs) were used explore environmental factors that drive global distribution these...
Dissolved organic matter (DOM) plays a key role in global biogeochemical cycles and experiences changes molecular composition as it undergoes processing. In the semi-closed basins of oligotrophic Mediterranean Sea, these gradual modifications can be observed close proximity. order to extend spatial resolution information on DOM available from ultrahigh mass spectrometry this area, we relate data optical (fluorescence absorption spectroscopy) measurements. Covariance between formulae signal...
Abstract Reservoirs act as carbon sinks when sedimentation of particulate organic (POC) exceeds CO 2 and CH 4 emissions. Here, we study the poorly explored process where phytoplankton‐derived acidic polysaccharides (APs) aggregate into matter, promoting export to sediments. This source POC in sediments can mineralize over various timescales. Our research, centered on a Mediterranean reservoir, elucidates phenological trends APs identifies their predominant drivers. findings present...
Without an adequate supply of dissolved vitamins, many species phytoplankton do not grow. Additions inorganic nutrients like phosphorus and nitrogen, trace metals iron, are alone to sustain life—a practical lesson learned quickly by experimental biologists when they try keep eukaryotic cultures alive in their labs. The reason is that coenzymes such as B vitamins also required for metabolic pathways. For example, vitamin B, serves a cofactor large number enzymatic systems, including the...
We characterized dissolved organic matter in La Caldera, an alpine lake Sierra Nevada (Spain), and water‐soluble compounds (WSOC) dry wet deposition originating from Saharan marine air masses using ultraviolet‐visible absorbance three‐dimensional fluorescence spectroscopy. Molar absorption coefficients at 250 280 nm the were highly correlated with those aerosol deposition, mainly dust, suggest that clear lakes unvegetated catchments may represent a unique sentinel of desertification global...