A5022853538- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Marine Bivalve and Aquaculture Studies
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Methane Hydrates and Related Phenomena
- Physiological and biochemical adaptations
- Atmospheric and Environmental Gas Dynamics
- Coastal and Marine Management
- Atmospheric chemistry and aerosols
- Mercury impact and mitigation studies
- Algal biology and biofuel production
- Heavy metals in environment
- Wastewater Treatment and Nitrogen Removal
- Environmental Toxicology and Ecotoxicology
- Marine and coastal plant biology
- Blood Coagulation and Thrombosis Mechanisms
- Diatoms and Algae Research
- Air Quality and Health Impacts
- Trypanosoma species research and implications
- Hydrocarbon exploration and reservoir analysis
Universidade de Vigo
2016-2025
Netherlands Institute of Ecology
2021
Universidad de Oviedo
1994-2016
Instituto de Investigacións Mariñas
1994-2012
Centre National de la Recherche Scientifique
2005-2006
Laboratoire d’Océanographie de Villefranche
2005-2006
National Oceanography Centre
1997-1999
University of Southampton
1996-1999
Hospital Universitario de Getafe
1995
University of Miami
1994
Abstract. Marine N2 fixing microorganisms, termed diazotrophs, are a key functional group in marine pelagic ecosystems. The biological fixation of dinitrogen (N2) to bioavailable nitrogen provides an important new source for ecosystems and influences primary productivity organic matter export the deep ocean. As one series efforts collect biomass rates specific different phytoplankton groups, we have constructed database on diazotrophic organisms global upper ocean by compiling about 12 000...
Abstract Phytoplankton size structure is key for the ecology and biogeochemistry of pelagic ecosystems, but relationship between cell maximum growth rate (μ max ) not yet well understood. We used cultures 22 species marine phytoplankton from five phyla, ranging 0.1 to 10 6 μm 3 in volume (V ), determine experimentally dependence growth, metabolic rate, elemental stoichiometry nutrient uptake. show that both μ carbon‐specific photosynthesis peak at intermediate sizes. Maximum nitrogen uptake...
We conducted a meta‐analysis of temperature, phytoplankton size structure, and productivity in cold, temperate, warm waters the world's oceans. Our data set covers all combinations temperature resource availability, thus allowing us to disentangle their effects. The partitioning biomass between different classes is independent but depends strongly on rate use as reflected primary production. Temperature production explained 2% 62%, respectively, variability contribution microphytoplankton...
Abstract Climate warming has the potential to alter ecosystem function through temperature-dependent changes in individual metabolic rates. The temperature sensitivity of phytoplankton metabolism is especially relevant, since these microorganisms sustain marine food webs and are major drivers biogeochemical cycling. Phytoplankton rates increase with when nutrients abundant, but it unknown if same pattern applies under nutrient-limited growth conditions, which prevail over most ocean. Here we...
Primary production by marine phytoplankton is one of the largest fluxes carbon on our planet. In past few decades, considerable progress has been made in estimating global primary at high spatial and temporal scales combining situ measurements with remote-sensing observations biomass. One major challenges this approach lies assignment appropriate model parameters that define photosynthetic response to light field. present study, a database photosynthesis versus irradiance (P-I) 20-year...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 216:43-56 (2001) - doi:10.3354/meps216043 Patterns of phytoplankton size structure and productivity in contrasting open-ocean environments Emilio Marañón1,*, Patrick M. Holligan2, Rosa Barciela3, Natalia González4, Beatriz Mouriño1, María J. Pazó1, Manuel Varela5 1Departamento de Ecoloxía e Bioloxía Animal,...
Abstract In the vast Low Nutrient Low‐Chlorophyll (LNLC) Ocean, vertical nutrient supply from subsurface to sunlit surface waters is low, and atmospheric contribution of nutrients may be one order magnitude greater over short timescales. The turnover time Fe N (<1 month for nitrate) further supports deposition being an important source in LNLC regions. Yet, extent which inputs are impacting biological activity modifying carbon balance oligotrophic environments has not been constrained....
The universal temperature dependence of metabolic rates has been used to predict how ocean biology will respond warming. Determining the sensitivity phytoplankton metabolism and growth is special importance because this group organisms responsible for nearly half global primary production, sustains most marine food webs, contributes regulate exchange CO2 between atmosphere. Phytoplankton increase with under optimal conditions in laboratory, but it unclear whether same degree exists nature,...
Abstract. The deep chlorophyll maximum (DCM) is a ubiquitous feature of phytoplankton vertical distribution in stratified waters that relevant to our understanding the mechanisms underpin variability photoautotroph ecophysiology across environmental gradients and has implications for remote sensing aquatic productivity. During PEACETIME (Process studies at air-sea interface after dust deposition Mediterranean Sea) cruise, carried out from 10 May 11 June 2017, we obtained 23 concurrent...
Abstract Temperature and nutrient supply interactively control phytoplankton growth productivity, yet the role of these drivers together still has not been determined experimentally over large spatial scales in oligotrophic ocean. We conducted four microcosm experiments tropical subtropical Atlantic (29°N-27°S) which surface plankton assemblages were exposed to all combinations three temperatures (in situ, 3 °C warming cooling) two treatments (unamended enrichment with nitrogen phosphorus)....
Abstract. Marine diazotrophs convert dinitrogen (N2) gas into bioavailable nitrogen (N), supporting life in the global ocean. In 2012, first version of oceanic diazotroph database (version 1) was published. Here, we present an updated 2), significantly increasing number situ diazotrophic measurements from 13 565 to 55 286. Data points for N2 fixation rates, cell abundance, and nifH gene copy abundance have increased by 184 %, 86 809 respectively. Version 2 includes two new data sheets...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 228:103-117 (2002) - doi:10.3354/meps228103 Photoacclimation and nutrient-based model of light-saturated photosynthesis for quantifying oceanic primary production Michael J. Behrenfeld1,*, Emilio Marañón2, David A. Siegel3, Stanford B. Hooker1 1National Aeronautics Space Administration, Goddard Flight Center,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 257:1-11 (2003) - doi:10.3354/meps257001 High variability of primary production in oligotrophic waters Atlantic Ocean: uncoupling from phytoplankton biomass and size structure Emilio Marañón1,*, Michael J. Behrenfeld2, Natalia González3, Beatriz Mouriño1, Mikhail V. Zubkov4 1Departamento de Ecología y...
The Atlantic Meridional Transect (AMT) programme is a series of bi-annual cruises between the Falkland Islands (50°S) and UK (50°N). Measurements abundance N2-fixing, colonial cyanobacterium Trichodesmium along this transect in years 1995–1999 reveal that it especially abundant 0 15°N, but by contrast almost completely absent 5 30°S. cruise path 15°N lies close to 20°W, on African (eastern) side Atlantic. maximum colony abundances we observed (∼100 000 colonies m–2) are greater than those...
We have determined the seasonal (July 2001‐July 2002) and vertical variability in photosynthetic production of dissolved organic carbon (DOC p ) particulate (POC a coastal upwelling ecosystem (Ría de Vigo, Northwest Spain), together with relationship between irradiance DOC time‐course over 24‐h periods. Euphotic layer‐integrated rates POC ranged 5 190 mg C m −2 h −1 40 1,130 , respectively. Irradiance was most important variable affecting percentage extracellular release [PER, defined as...
Abstract. We have determined the photosynthetic production of dissolved (DOCp) and particulate organic carbon (POCp) along a longitudinal transect in Mediterranean Sea during summer stratification period. The euphotic layer-integrated rates DOCp POCp ranged between approximately 50–130 95–210 mgC m−2 d−1, respectively, showed an east to west increasing trend. For whole transect, relative contribution total, primary (percentage extracellular release, PER) averaged ~37% did not show any clear...
The relationship between phytoplankton cell size and abundance has long been known to follow regular, predictable patterns in near steady-state ecosystems, but its origin remained elusive. To explore the linkage size-scaling of metabolic rate distribution natural communities, we determined simultaneously carbon fixation rates across a volume range over six orders magnitude tropical subtropical waters Atlantic Ocean. We found an approximately isometric (mean slope value: 1.16; range:...
ABSTRACT We investigated the effects of bottle enclosure on autotrophic and heterotrophic picoplankton in North South subtropical Atlantic oligotrophic waters, where biomass metabolism microbial community are dominated by size class. measured changes both ( Prochlorococcus , Synechococcus picoeukaryotes) during three time series experiments 16 endpoint over 24 h light dark treatments. Our results showed a divergent effect incubation components community. The picophytoplankton showed,...
Rates of metabolism and population growth are often assumed to decrease universally with increasing organism size. Recent observations have shown, however, that maximum rates among phytoplankton smaller than ∼6 μm in diameter tend increase Here we bring together theory demonstrate the observed change slope is attributable a trade-off between nutrient uptake potential rate internal metabolism. Specifically, apply an established model explore ability cells replenish their quota (which...