Variación estacional de esporas fúngicas en el aire de Huelva de abril de 1989 a abril de 1991

En este trab¡]jo pretendemos estudiar I:J micoOora de 1;. :ttm6:,(cr:-~ de 1:~ ci ud~1d de Huch•a, situada en el SW de Esp~ii;~, que prcscnw un Jito lli.,.el de cont:tmin:tción. An:tlizam~ la incidencia y la evolución bianual (10 de abril de 1989 a M de obril de 1 9~ 1 ) de esporas de hongos pertenecientes o 3 géneros, 17 g-fncros forma y a cuatro ~rupu::, :,in -.:utcgorfa taxonómica, atcndiendu a la modologfu de ::,us ~;sporas: asoospura!., ha!'.idin!.pora.;;, 1111Ícclul<~ res y pluricelulares no identilicadas. He~nos ccnlmdo 11\IC!i.lt:t atención \!n aquellos grupo~ que dcslacan por su abund:mcíJ, por SLJ caráctc.r alcrgiL1nte o [)Or su interés en el c-.unpo de la agrkultu r:~. Por otra parle los resultJdos obtcnitlos los rclncionamo.., cou loe; r'nr{imetro::. meteorológicos.This work sturJics thc micoOora prcscnt in tlu.: aunosphcrc or thc city of Hu el· va, which is loC".deV in the South West of Spain wich ha:, an clcvntcd polhu ion lcvcl. Wc anali1..cd thc presence ;~nd biannual variatiOil {lO april JC}89 to ~ í•pril 1991) of 5porcs of fungi bclonging ro threc genera, ~evcntccn form gcnc.ra and fnur gropus which lack taxonomical catcgory from cxaminotion of thc sporc morphology: ~~rores, b:t ~idi o~porcs, unicclubr and pluricelu lar unidcntificd. Wc ha\·~ p:~id spccml :mcmion tQ thuw. group!oo whic.:h are oí int er~t in thc. agricultura! r.eh.l On tbe ~ rcr hall, th\.: rc~uh ~, oht;1incd ~hllwCd ~.;orrclat ion~ \lo~lh mc1eorologic.1l pilrilmclers

Estudio aeropolínico de Sevilla (1988-1990)

Se presenta en d presente trabajo la VJriación anu;al del contenido =-eropolínico de la ciudad de Se\illa (Andalud a, España), establecida a pa rlir de IJ.S medias de los Oalos oU«enidos semanalmente en tres a ño~ de muemco (1988, 1989 y 1990). Pan1 d io se hun em· ple.1do dos c-...ptudorcs polfnicos tipo Cour COilVc.nie.nlemcntc distribuidos en la g,eo~ra ria ur· bJDJ.Wc providc in this work a stuc.ly on thc annual variJLion or airbuwc poli en in the ilir or Se\'ille (Aru.lalus1 a, Spain). Samples wc:rc carried out during thr~e consceutivc ycnrs ( 1988, 1989 and 1990) usin& two Cour's collcccou which \lot.re p~t ioned, onc at t.hc: cily centre and thc Olber on 1hc outskirts {airporl)

A new method for determining the sources of airborne particles.

Air quality is a major issue for humans owing to the fact that the content of particles in the atmosphere has multiple implications for life quality, ecosystem dynamics and environment. Scientists are therefore particularly interested in discovering the origin of airborne particles. A new method has been developed to model the relationship between the emission surface and the total amount of airborne particles at a given distance, employing olive pollen and olive groves as examples. A third-degree polynomial relationship between the air particles at a particular point and the distance from the source was observed, signifying that the nearest area to a point is not that which is most correlated with its air features. This work allows the origin of airborne particles to be discovered and could be implemented in different disciplines related to atmospheric aerosol, thus providing a new approach with which to discover the dynamics of airborne particles

Low-temperature, shallow-water hydrothermal vent mineralization following the recent submarine eruption of Tagoro volcano (El Hierro, Canary Islands)

Hydrothermal iron (Fe)-rich sediments were recovered from the Tagoro underwater volcano (Central Atlantic) that formed during the 2011–2012 volcanic event. Cruises in 2012 and 2014 enabled the monitoring and sampling of the early-stage establishment of a hydrothermal system. Degassing vents produced acoustic flares imaged on echo-sounders in June 2012, four months after the eruption. A novel hydrothermal vent system was discovered and sampled in 2014 during a ROV dive. The system is characterized by hornito-like structures and chimneys showing active CO2 degassing and anomalous temperatures at 120–89 m water depth, and along the SE flank at 215-185 m water depth associated with secondary cones. Iron- and silica-rich gelatinous deposits pooled over and between basanite in the hornitos, brecciated lavas, and lapilli. The low temperature, shallow-water hydrothermal system was discovered by the venting of Fe-rich fluids that produced a seafloor draped by extensive Fe-flocculate deposits precipitated from the neutrally buoyant plumes located along the oxic/photic zone at 50-70 m water depths. The basanite is capped by mm- to cm-thick hydrothermally derived Fe-oxyhydroxide sediment, and contains micro-cracks and degasification vesicles filled by sulfides (mostly pyrite). Mineralogically, the Fe-oxyhydroxide sediment consists of proto-ferrihydrite and ferrihydrite with scarce pyrite at their base. The Fe-rich endmember contains low concentrations of most trace elements in comparison with hydrogenetic ferromanganese deposits, and the sediments show some dilution of the Fe oxyhydroxide by volcanic ash. The Fe-oxyhydroxide phase, with a mean particle size of 3–4 nm, low average La/Fe ratios of the mineralized deposits from the various sampling sites, and the positive Eu anomalies indicate rapid deposition of the Fe oxyhydroxide near the hydrothermal vents. Electron microprobe studies show the presence of various organomineral structures, mainly twisted stalks and sheaths covered by iron-silica deposits within the mineralized samples, reflecting microbial iron-oxidation from the hydrothermal fluids. Sequencing of 16 s rRNA genes also reveals the presence of other microorganisms involved in sulfur and methane cycles. Samples collected from hornito chimneys contain silicified microorganisms coated by Fe-rich precipitates. The rapid silicification may have been indirectly promoted by microorganisms acting as nucleation sites. We suggest that this type of hydrothermal deposit might be more frequent than presently reported to occur in submarine volcanoes. On a geological scale, these volcanic eruptions and low-temperature hydrothermal vents might contribute to increased dissolved metals in seawater, and generate considerable Fe-oxyhydroxide deposits as identified in older hot-spot seamounts