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23
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Introduction
http://www2.uca.es/grup-invest/microbentos/
My research activity is mainly focused on primary production of Microphytobenthos (MPB) and its influence on the nutrient dynamic at the water-sediment interphase. I use a combination of methods including measurements using selective microsensors (e.g. O2, H2S & pH) and more traditional biogeochemical techniques. I perform measurements both in laboratory microcosms and in situ experiements to achieve my goals.
Current institution
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December 2010 - August 2017
December 2010 - present
Publications
Publications (23)
Microphytobenthos (MPB), the photosynthetic primary producing component of microbenthos, shows variable patterns in its biomass distribution along the intertidal gradient as a result of the interactions of factors such as light, tides, temperature, and grazing pressure. These patterns have been studied more extensively in northern European estuarie...
The interactions between phytoplankton, bacteria and resources, irradiance, and nutrients, leading to the formation of deep chlorophyll maxima (DCMs), are little understood in acid lakes. In “El Sancho” reservoir (Iberian Pyritic belt, Huelva, Spain), an acid mine drainage impacted waterbody (pH 3.5–4.0), a strong DCM forms in the metalimnion durin...
La conservación de lagunas mareales y estuarios pasa por una delimitación espacial de las comunidades dominantes así como por una adecuada caracterización de su funcionamiento trófico. En el caso de las áreas intermareales, tradicionalmente se ha venido discriminando entre fondos de macrófitos marinos y fondos desnudos o colonizados por microfitobe...
Diel primary production patterns of intertidal microphytobenthos (MPB) have been attributed to short-term physiological changes in the photosynthetic apparatus or to diel changes in the photoautotrophic biomass in the sediment photic layer due to vertical migration. Diel changes in primary production and vertical migration are entrained by external...
Tropical estuaries are very little studied compared to temperate ones, despite their generally high primary production rate and hence potential contribution to global carbon and nitrogen budgets. The Gulf of Nicoya (northwest Costa Rica Pacific coast) is one of the most productive estuaries worldwide. However, how changes in benthopelagic coupling...
Irradiance and temperature variations during tidal cycles modulate microphytobenthic primary production potentially by changing the radiative energy balance of photosynthetic mats between immersion and emersion and thus sediment daily net metabolism. To test the effect of tidal stages on the radiative energy budget, we used microsensor measurements...
The interactions between phytoplankton, bacteria and nutrients leading to the formation of deep chlorophyll maximum (DCM) in
acid lakes are little understood. Here, we studied the Sancho reservoir (Iberian Pyritic belt, Huelva, Spain), an acid mine drainage impacted water body (pH 3.5 - 4.0), where a strong DCM forms during the stratification perio...
Primary production of microphytobenthos (MPB) contributes significantly to the total production in shallow coastal environments. MPB is a diverse community in which diatoms are usually the main microalgal group. Diatoms require N, P and other nutrients as with other autotrophs, but in addition require silicate to create their outer cell wall. There...
Microphytobenthos (MPB) plays a key role in the cycling of carbon and nitrogen in shallow estuaries and intertidal areas, contributing up to 50% of primary production. In the inner Cadiz Bay, the intertidal zone covers ~60% of its surface. Therefore, it is important to study the spatial and seasonal variability of microphytobenthic net primary prod...
Self-shading is widely known for primary producers, but it has been not addressed in detail for microphytoben-thos (MPB). Upper layers of MPB biomass limit light availability to the layers below, reducing the thickness of the photic layer within the sediment (zphot) and likely limiting MPB primary production and growth. To test this hypothesis, we...
Irradiance and temperature changes during tidal cycles affect microphytobenthic primary production potentially changing the radiative energy balance in the photosynthetic biofilm between immersion and emersion. To test this hypothesis, we estimated for the first time the radiative energy budget in a photosynthetic microbial mat during immersion and...
Greenhouse gas production in coastal sediments is closely associated with the early diagenesis processes of organic matter and nutrients. Discharges from anthropogenic activities, particularly agriculture, fish farming and waste-water treatment plants supply large amounts of organic matter and inorganic nutrients that affect mineralization processe...
Intertidal areas support extensive diatom-rich biofilms. Such microphytobenthic (MPB) diatoms exude large quantities of extracellular polymeric substances (EPS) comprising polysaccharides, glycoproteins and other biopolymers, which represent a substantial carbon pool. However, degradation rates of different EPS components, and how they shape hetero...
El método semi-implícito de Crank-Nicolson ha sido históricamente empleado para aproximar numéricamente ecuaciones de tipo parabólico (ley de Fourier del calor, segunda ley de Fick de la difusión), dada la estabilidad y convergencia de sus soluciones, su menor margen de error y el bajo coste computacional que requiere. Sus aplicaciones hoy en día s...
In this study, we reconstruct the recent environmental evolution of the inner Cadiz Bay using sedimentary records reaching back as far as AD 1700. We report lithological descriptions of the sediments and extensive mineralogical and geochemical analyses. An extraction technique that identifies different Fe phases provides an assessment of diagenetic...
The study of inorganic nutrients dynamics in shallow sediments usually focuses on two main pools: porewater (PW) nutrients and exchangeable (EX) ammonium and phosphate. Recently, it has been found that microphytobenthos (MPB) and other microorganisms can accumulate large amounts of nutrients intracellularly (IC), highlighting the biogeochemical imp...
The Telecommunications Marine Laboratory (TML) of the University of
Cádiz takes part in a research project to study the intertidal sediments of the Bay
of Cádiz. The collection of samples from the seabed and the transmission of data
to the surface are performed by a Mini Profiler with four channels (MP4), which is
supplied by UNISENSE. Each channel...
The “El Sancho” reservoir (Iberian Pyritic belt, Huelva, Spain) is an acid mine drainage impacted monomictic water body (pH 3.5-4.0). During the stratification period, a deep chlorophyll maximum (DCM) develops around 22 m depth, immediately below the thermocline and at an in situ irradiance < 8 µmol m-2 s-1. In 2013, the DCM showed maximum chloroph...
Extracellular polymeric substances (EPS) excreted by microphytobenthos, comprising primarily of diatoms, are important in stabilization of intertidal sediments and as a carbon source for heterotrophic organisms. However, the degradation rates of the different forms of EPS and how they shape the heterotrophic community in the sediment are not well u...
