DigitalUM :: Browsing by browse.metadata.contributordepartment "Química Agrícola, Geología y Edafología"

Browsing by browse.metadata.contributordepartment "Química Agrícola, Geología y Edafología"

Now showing 1 - 20 of 39

Embargo
A descriptive bibliometric study on bioavailability of pesticides in vegetables, food or wine research (1976–2018)
(Elsevier, 2020) Andreo Martínez, Pedro; Ortiz Martínez, Víctor Manuel; García Martínez, Nuria; Pagán López, Pablo; Quesada Medina, Joaquín; Cámara Botía, Miguel Ángel; Oliva Ortiz, José; Química Agrícola, Geología y Edafología
A bibliometric analysis based on the Web of Science© (WOS) database was performed on bioavailability of pesticides in vegetables, food or wine related studies published from inception to 2018. A total of 1202 articles were subjected to examination. The results reveal that yearly production of scientific articles increased steadily. Journal and institution production, and author's keywords frequencies followed the Lotka’s Law. Khan SU and White JC were the most productive authors. The most productive journals were Journal of Agricultural and Food Chemistry (55), and Journal of Ethnopharmacology (48), and the most common WOS subject category was Pharmacology & Pharmacy (419). USA (h-index of 40) produced 21.7 % of all articles, closely followed by China (20.6 %). Chinese Academy of Sciences (34) was the most productive research institutions. Finally, current and future trends in this area should focus on keywords such as pharmacokinetics, curcumin, in-vitro, nanoparticles, oral (bioavailability) and cell.
Embargo
A meta-analysis of gut microbiota in children with autism
(Springer, 2021) Andreo Martínez, Pedro; Rubio Aparicio, María; Sánchez Meca, Julio; Veas, Alejandro; Martínez González, Agustín Ernesto; Química Agrícola, Geología y Edafología
Previous studies have reported dysbiosis in the gut microbiota (GM) of children with autism spectrum disorders (ASD), which may be a determining factor on child development through the microbiota-gut-brain axis. However, it is not clear if there is a specific group of dysbiotic bacteria in ASD. The aim of this study was to carry out a meta-analysis on the studies that analyze GM in children with ASD. 18 studies fulfilled our selection criteria. Our results showed a lower relative abundance of Streptococcus (SMD+ = − 0.999; 95% CI − 1.549, − 0.449) and Bifidobacterium genera (SMD+ = − 0.513; 95% CI − 0.953, − 0.073) in children with ASD. Overall, the Bifidobacterium genera is involved. However, differences found between studies are attributed to factors such as reporting bias.
Embargo
A web application to estimate the carbon footprint of constructed wetlands
(Elsevier, 2020-10-10) Andreo Martínez, Pedro; Ortiz Martínez, Víctor Manuel; Andrés, Muñoz; Menchón Sánchez, Pablo; Quesada Medina, Joaquín; Química Agrícola, Geología y Edafología
Constructed wetlands (CWs) are engineering systems recognized as an efficient and sustainable option to wastewater treatment. Due to the growing interest in CWs for waste management, the number of works analyzing their footprint and impact has risen in the last years. Thus, the study of these systems and their components in construction, operation, and demolition phases is important to characterize the technology and achieve a fully environmental-friendly approach. Until now, no complete tools for measuring both direct and indirect greenhouse gas (GHG) emissions in CWs have been reported in the field. Some efforts in this line are Life Cycle Assessment tools, which can be economically expensive and usually require specific training. Therefore, this work aims to present a web application as an open and complete tool for the estimation of GHG emissions in CWs, including both direct and indirect emissions and considering all the stages involved in their management.
Open Access
Analysis of Intact Glycosidic Aroma Precursors in Grapes by High-Performance Liquid Chromatography with a Diode Array Detector
(MDPI, 2021-01-19) Cebrián-Tarancón, Cristina; Oliva, José; Cámara, Miguel Ángel; Alonso, Gonzalo L.; Salinas, M. Rosario; Química Agrícola, Geología y Edafología
Nowadays, the techniques for the analysis of glycosidic precursors in grapes involve changes in the glycoside structure or it is necessary the use of very expensive analytical techniques. In this study, we describe for the first time an approach to analyse intact glycosidic aroma precursors in grapes by high-performance liquid chromatography with a diode array detector (HPLC-DAD), a simple and cheap analytical technique that could be used in wineries. Briefly, the skin of Muscat of Alexandria grapes was extracted using a microwave and purified using solid-phase extraction combining Oasis MCX and LiChrolut EN cartridges. In total, 20 compounds were selected by HPLC-DAD at 195 nm and taking as a reference the spectrum of phenyl
Embargo
Approach to biodiesel production from microalgae under supercritical conditions by the PRISMA method
(Elsevier, 2019) Ortiz Martínez, Víctor Manuel; Andreo Martínez, Pedro; García Martínez, Nuria; Pérez de los Ríos, Antonia; Hernández Fernández, Francisco José; Quesada Medina, Joaquín; Química Agrícola, Geología y Edafología
Increasing energy demands lead to the search for sustainable biofuels such as biodiesel from renewable sources such as algal biomass. Specially, microalgae have become increasingly popular as biodiesel feedstock due to their fast-growing rates and relatively high level of lipids. The non-catalytic transesterification reaction of microalgae oil under supercritical conditions in the presence of alcohols is an efficient process for biodiesel production and can overcome some of the limitations posed by subcritical catalytic transesterification. Two-step and one-step processes have been reported for this purpose, in the last case with extraction and transesterification stages being performed simultaneously. This works offer a systematic review using the PRISMA methodology analyzing the status of this research topic and identifying future research strategies. With this work, PRISMA methodology is applied for the first time within technological engineering fields. Moreover, this is the first specific overview on the production of biodiesel from microalgae under supercritical conditions. Several key factors such as microalgae type and operation variables including extraction oil, temperature and reaction time, pressure, water content in biomass, alcohol excess and final biodiesel properties are discussed. Further efforts need to be done in order to study the continuous biodiesel production by the development of integrated processes that involve both microalgae cultivation and biodiesel production.
Open Access
Assessment of heavy metals and color as indicators of contamination in street dust of a city in SE Spain: Influence of traffic intensity and sampling location.
(MDPI, 2018-11-08) Marín Sanleandro, Purificación; Sánchez Navarro, Antonio; Díaz Pereira, Elvira; Bautista Zúñiga, Francisco; Romero Muñoz, Miriam; Delgado Iniesta, María José; Química Agrícola, Geología y Edafología
In the present work, a sampling grid of the urban core of the city ofMurcia (South East Spain) was designed in order to analyze street dust, focusing on the contents of the heavy metals Cd, Cr, Cu, Ni, Pb, and Zn and their relationships with the color of the sample, the traffic pattern, and the location where they were sampled (sidewalks, ledges, and roads). The characterization of the samples was carried out by X-ray diffraction and scanning electron microscopy, whereas the heavy metals were extracted by acid digestion and determined by inductively coupled plasma mass spectrometry. The concentration (mg/kg) in urban dust of the city of Murcia was highest for Zn (653), followed by Cu (201) > Pb (177) > Cr (117) > Ni (51) >> Cd (0.5). The color expounded statistically significant differences with regard to the heavy metals, including the pollutant load. The same pattern was found when the classification variable was the traffic intensity, except in the case of Ni. The areas with a higher risk of contamination by heavy metals in the urban dust are the ledges of narrow city center streets with moderate traffic, where Zn and Pb seem to accumulate most greatly.
Embargo
Comprehensive Review on Monitoring, Behavior, and Impact of Pesticide Residues during Beer-Making.
(ACS Publications, 2023-02-01) Pérez-Lucas, Gabriel; Navarro, Ginés; Navarro, Simón; Química Agrícola, Geología y Edafología
This paper reviews the impact of beer-making stages (malting, mashing, boiling, and fermentation) on the behavior of pesticide residues. The large use of pesticides on barley and hop could cause the occurrence of their residues in beer. The foremost factors influencing the stability of residues (pH, temperature, and water content) and the physical-chemical properties of pesticides (octanol–water partition coefficient, vapor pressure, and water solubility) are essential to know their final fate. Most pesticides show a decrease in the unhopped wort because they are adsorbed onto the spent grains after mashing. In addition, their concentrations decrease during boiling and fermentation. Generally, maltsters should dedicate particular attention to the residues of hydrophobic pesticides because they can remain on the malt. Contrarily, brewers should control residues of hydrophilic pesticides because they can be carried over into young beer, disturbing the quality and organoleptic properties (flavor, aroma, taste, or color) of the beer.
Open Access
Concreciones de Bario y Estroncio en Aptiense-Albiense del Subbético de Murcia.Valor Patrimonial
(2014) Arrufat Milán, Luis; Alias Linares, María Asunción; Guillén Mondéjar, Francisco; Rosillo Martínez, José Fidel; Ramo Jiménez, Antonio D.; Gómez Gómez, Joaquín; Química Agrícola, Geología y Edafología
Open Access
Conocimientos y Usos Tradicionales de la Geodiversidad: las leyendas de las Encantadas en España, el caso de la Encantada de Huéscar (Granada)
(2021) Rosillo Martínez, José Fidel; Alias Linares, María Asunción; Sánchez Navarro, Antonio; Guillén Mondéjar, Francisco; Química Agrícola, Geología y Edafología
Sobre Las Encantadas existen en España numerosas publicaciones. Sin embargo, apenas aparecen estudios o inventarios referentes a los usos tradicionales de la geodiversidad sobre estas leyendas vinculadas con lugares geológicos.En este sentido, el primer estudio de detalle sobre esta temática ha sido el realizado por Rosillo Martínez (2019) en su tesis doctoral. Cuevas, roquedos, ríos, fuentes, cerros, etc., son elementos geológicos en los que pueden existir leyendas sobre Encantadas; fábulas o mitos que las generaciones actuales hemos escuchado de nuestros mayores o que aparecen reflejados en escritos antiguos. Son numerosos los lugares a lo largo y ancho de la geografía española, en los que su geodiversidad hasido fundamental para la existencia de leyendas populares; saberes que han sido transmitidos durante siglos de generación en generación a través de la tradición oral. La identificación, inventario y descripción de estos lugares geológicos y sus leyendas, mediante la valoración de su interés científico, didáctico y turístico/recreativo, contribuirá sin lugar a dudas a la protección de nuestro patrimonio geológico y los conocimientos y usos tradicionales de la geodiversidad. Su puesta en valor fomentará el geoturismo y contribuirá al desarrollo económico de los pueblos donde se encuentran.
Open Access
Contribution of critical doses of iprovalicarb, mepanipyrim and tetraconazole to the generation of volatile compounds from Monastrell-based wines
(Elsevier, 2023-03-01) Sieiro-Sampedro, Thais; Figueiredo-González, María; Garzón-Vidueira, Raúl; Cancho-Grande, Beatriz; González-Barreiro, Carmen; Cámara, Miguel A.; Oliva, José; Rial-Otero, Raquel; Química Agrícola, Geología y Edafología
The individual effects of iprovalicarb, mepanipyrim, and tetraconazole on the volatile composition and aromatic profile of Monastrell-based wines were evaluated. To date, no studies about the effect of these fungicides on Monastrell-based wines are available, and the effect on other grape varieties is also unknown. Fungicides were added separately in the cellar to the grape must at two concentration levels (4 and 10 mg/kg for iprovalicarb and mepanipyrim and 1 and 2.5 mg/kg for tetraconazole). The aromatic composition of the final wines was analysed by gas chromatography using flame ionisation and ion trap mass selective detectors. In the presence of fungicides, the most significant variations were observed for isoamyl acetate and 2-phenylethyl acetate (increasing between 20 and 43% compared with the control wine) and ethyl caprate and caprylate (increasing between 12 and 68%). Consequently, treated wines showed a higher global odourant intensity, with increased fresh fruit notes.
Embargo
Decline of fluroxypyr and triclopyr residues from pure, drinking and leaching water by photo-assisted peroxonation
(Elsevier, 2020) Pérez-Lucas, Gabriel; Aliste, Marina; Vela, Nuria; Garrido, Isabel; Fenoll, José; Navarro, Simón; Química Agrícola, Geología y Edafología
Groundwater is a source for drinking water in many countries, and its use is seriously threatened by the leaching of agrochemicals through the soil. With this aim, the oxidation of triclopyr and fluroxypyr in water was investigated at lab-scale using heterogeneous photocatalysis and photo-assisted ozonation combined with hydrogen peroxide H2O2 (peroxone process). For both herbicides, the order of effectiveness of the photo-assisted treatments in pure water were as follows: O3/H2O2>ZnO/Na2S2O8>TiO2/Na2S2O8. Comparing the three types of water, the rate constants through peroxone/UV process were in the order: Pure > Drinking > Leaching water, according to the complexity of the matrix. After two hours of treatment, fluroxypyr was completely removed from pure water, while 90 % and 55 % of its initial mass were removed from drinking and leaching water, respectively. On the other hand, the degradation of triclopyr was significantly slower. In this case, after two hours of illumination the complete degradation was not reached in any case. Owing to the generation of hydroxyl radicals (HOradical dot) the water treatment with O3/H2O2/UV can be considered as an eco-friendly technology, although the substances present in the matrix, mainly in leaching water, can scavenge HOradical dot decreasing the photooxidation rate of both herbicides.
Open Access
Dissipation of Three Fungicides and Their Effects on Anthocyanins and Color of Monastrell Red Wines
(MDPI, 2019-03-22) Briz-Cid, Noelia; Rial-Otero, Raquel; Cámara, Miguel A.; Oliva, José; Simal-Gandara, Jesus; Química Agrícola, Geología y Edafología
The effect of fungicides on fermentation is of paramount importance to control the quality and safety of wines. In this work, the quality (enological parameters, color, phenolic content, antioxidant activity, and fungicide residues) of wines from Monastrell grapes fortified with iprovalicarb, mepanipyrim, and tetraconazole fungicides was evaluated. Along the winemaking process, initial residues of mepanipyrim and tetraconazole were removed in more than 90% while the dissipation of iprovalicarb was around 73%. Significant statistical differences were found in the presence of iprovalicarb and mepanipyrim residues, especially at the highest concentration assayed. For both fungicides, increases in the volatile acidity (between 4 and 8.6 times), the lactic acid content (between 8.6 and 20.5 times), the percentage of polymeric anthocyanins (between 1.3 and 1.7 times), and also a slight increase of the total phenolic index and the total anthocyanin content determined by spectrophotometry were observed. On the contrary, the total monomeric anthocyanins content decreased about 16.3% and 28.6% in the presence of iprovalicarb and mepanipyrim, respectively. These results could be related to a higher development of acetic acid or lactic bacteria in the presence of these fungicides. The color of the final wines was also different in comparison with the control, with a higher yellow component, color intensity, tonality, and hue angle because of pH changes in the medium. Tetraconazole fermentations had a more similar trend to the control wine, probably due to the lower concentration of this fungicide in the grape must at the initial time. No effects on the antioxidant activity was observed for any of the target fungicides. A multivariate statistical analysis was done to view the interrelationships between different variables (color and anthocyanins profile). The obtained model allowed the wines to be separated according to the fungicide treatment applied.
Open Access
Effect of fungicides on the yeast population during spontaneous fermentation in the vinification of monastrell grapes
(Elsevier, 2020-09) Oliva, José; Girón, Francisco; Cayuela, José M.; Mulero, Juana; Zafrilla, Pilar; Cámara, Miguel Angel; Química Agrícola, Geología y Edafología
The influence of six fungicides on indigenous yeasts of grape var. Monastrell, after performing two treatments (Good Agricultural Practices-GAP and Critical Agricultural Practices-CAP), was studied. Fungicide residues have been determined using a method of multi-residual extraction that uses QuEChERS and liquid chromatography in tandem with triple quadrupole mass spectrometry. Identification of yeast was carried out by PCR and subsequent sequencing. The fungicide residues are below the EU maximum residue limits (MRLs) established in wine grapes. At the beginning and during the fermentation, most of the treated samples show counts (CFU/mL) higher than the control test (20–30% more), even in the most unfavorable conditions (treated the same day of harvest). It is noteworthy the absence of Hanseniaspora uvarum and the presence of Clavispora lusitaniae, Debaryomyces hansenii and Metschnikowia pulcherrima. Nevertheless, no fungicide either under treatment inhibits fermentation or delays it. Moreover, the evolution of yeast populations found during fermentation follows the normal sequence of species. This research might be of interest for scientists and companies working on either basic or production aspects respectively of the winemaking process.
Open Access
Effects of drought and water pulses on microbial functionality and the role of Cyanoprokaryota in the rhizospheres of gypsophytes
(2019-07-08) Díaz-Pereira, Elvira; Marín Sanleandro, Purificación; Asencio, Antonia Dolores; Química Agrícola, Geología y Edafología
The effects of drought in semiarid Mediterranean environments are known in many aspects; however, there are others for which information is lacking. In this work, two samplings were carried out - the first during a summer drought and the second during spring - in the rhizospheres of three gypsophytes and in non-rhizospheric soil, to detect the responses, fundamentally biochemical, to the availability of water in the soil. Urease and protease showed higher values after the drought whereas the activity of the β-glucosidase was highest in the spring. This pattern was the same for all the rhizospheres tested. However, the arylsulfatase and alkaline phosphatase did not change in terms of the sampling date or the rhizosphere under study. Surprising results were obtained when water retention and water loss were studied with the highest values being obtained for the dry season due to the association of Cyanoprokaryota (with high diversity and rarity) with the rhizospheresas a result of a water pulse. The results in our work are also explained by two water pulses that occurred before the samplings. Several indicators are proposed such as microbial biomass carbon and basal respiration rate responded best to the microbiological activation just after drought, together with the enzymes urease and protease. However, it was the dehydrogenase activity in spring that best reflected the microbiology associated with the carbon cycle, together with the enzyme β-glucosidase. It was showed the interrelationships between carbon and nitrogen through to the indices: water soluble nitrogen and water soluble carbon. We can propose three functional adaptation mechanisms of these plants associated with the Cyanoprokaryota in their rhizospheres. Herniaria fruticosa is a pioneer with the greatest diversity and abundance. An intermediate strategy is presented by Teucrium balthazaris, with a greater diversity and abundance of Cyanoprokaryota in spring. Finally, Helianthemum squamatum has lower diversity and abundance.
Open Access
Estudio de Arenas de Sílice y de un Conjunto de Vidrios (SS.XVII-XIX) hallados en Puebla de Don Fadrique (Granada)
(2014) Rosillo Martínez, José Fidel; Alias Linares, María Asunción; Guillén Mondéjar, Francisco; Arrufat Milán, Luis; Sánchez Navarro, Antonio; Química Agrícola, Geología y Edafología
Open Access
Estudio químico y mineralógico de un conjunto de vidrios de Castril (SS. XVII-XIX) (Granada)
(2015) Rosillo Martínez, José Fidel; Alias Linares, María Asunción; Guillén Mondéjar, Francisco; Arrufat Milán, Luis; Química Agrícola, Geología y Edafología
Open Access
Heavy Metals and Trace Elements in Human Breast Milk from Industrial/Mining and Agricultural Zones of Southeastern Spain
(MDPI, 2021-09-02) Motas, Miguel; Jiménez, Sandra; Oliva, José; Cámara, Miguel Ángel; Pérez‐Cárceles, María Dolores; Química Agrícola, Geología y Edafología
Human breast milk is the most complete foodstuff for infants but can also be a potential source of exposure to toxic chemicals. The aim of this study was to assess the levels of metal pollution in the breast milk of women living in agricultural and industrial/mining areas of the Region of Murcia (Spain) that are well known for their cases of environmental pollution. Human milk samples were collected from 50 mothers and inorganic contaminants were analyzed using inductively coupled plasma mass spectrometry (ICP‐MS). The mean or maximum concentrations of the different inorganic elements analyzed in breast milk, with the exception of manganese, exceeded the maximum limits established by the WHO and could constitute a high risk for pregnant mothers and their children. The breast milk of women living in the industrial/mining zone presented the highest levels of aluminum, zinc, arsenic, lead, mercury and nickel. On the contrary, the highest concentrations of manganese, chromium and iron were determined in the milk of women living in the agricultural zone. These results suggested and confirmed different profiles of environmental contamination of these areas.
Open Access
Influence of date palm-based biochar and Compost on Water Retention properties of soils with different sand contents
(MDPI, 2024-02-05) Delgado Iniesta, María José; Le Guyader, Elie; Morvan, Xavier; Miconnet, Vincent; Marin, Béatrice; Moussa, Mohamed; Intrigliolo, Diego S.; Girods, Pierre; Fontana, Sebastien; Sbih, Mahtali; Boumaraf, Belkacem; Tirichine, Aissa; Kavvadias, Victor; Gommeaux, Maxime; Química Agrícola, Geología y Edafología
Generally, soils of arid and semi-arid regions have low water retention properties due to high sand and low organic carbon contents. This study aimed at quantifying the effect of date palm-based organic amendments (OAs) on the water retention properties of two soils (sandy loam and silty loam), as well as the influence of sand supplementation (0.5–2 mm) on the magnitude of the effect of OAs. Different grain size distributions were obtained by adding sand to natural soils. For this purpose, sand was added to the two soils (1/3 and 2/3) and different soil-OA combinations were tested at a dose of 3% by mass: compost alone, biochar alone and a mixture of biochar and compost (50:50 in mass), in addition to unamended control soils. Soil water contents were measured at nine matric potentials ranging from the saturation to the permanent wilting point. Biochar was more efficient than compost at improving soil water retention. The effect of organic amendments on water retention increased with sand content. In most cases, soil water content values were significantly higher for biochar-amended soils than for unamended or compost-amended soils. The weakness of the effect of compost addition (if alone) was probably due to its properties and notably its high mineral content and electrical conductivity. Soil sand supplementation led to higher differences between the OA-amended soils and unamended soils. Changes in available water capacity reached +26% and +80% in a sandy loamy soil enriched with 2/3 sand and amended with compost and with biochar, respectively, compared to the unamended soil. These results show that sand content (and more generally, soil texture) influences the effect of OA application. Thus, the application of biochar from date palm residues in soil seems to be an effective solution to improve the water retention properties of coarse textured soils and contribute to optimizing the use of water resources in irrigated areas.
Open Access
Influence of intensive horticultural cultivation on soil salinity in Campo de Cartagena (Murcia).
(2020-10-18) Sánchez-Navarro, Antonio; Girona Ruiz, Aldara; Delgado Iniesta, María José; Química Agrícola, Geología y Edafología
The electrical conductivity (EC) and ionic composition of the soil solution of a Haplic Calcisol in Campo de Cartagena (Murcia, Spain) were studied in situ for four years in an experimental plot of vegetables in the open air, together with the relationship between these parameters and the quality of the irrigation water used and the management of the plot. The results show that there were very significant fluctuations in these variables during the study period and that these fluctuations depended on the management of the plot and, in particular, on the irrigation water used. Therefore, for an adequate management of these agro-ecosystems, it is necessary to establish a network of experimental plots in situ, where sensitive indicators of soil degradation are monitored, in our case the EC and the ionic composition of the soil solution. Such indicators are capable of detecting these degradation processes and their relationship with the inappropriate management of this resource.
Open Access
Insights on the climatic evolution at the pre-Jaramillo to Jaramillo transition in Europe using mineralogical analysis of the Quibas palaeontological site (Early Pleistocene, southern Iberian Peninsula)
(Spanish Society of Palaeontology, 2023-10-30) Del Castillo Sobrinos, E.; Alias Linares, M. A.; Laborda-lopez, C.; Iannicelli, C.; Agusti, J.; Piñero Garcia, P.; Química Agrícola, Geología y Edafología
The palaeontological site of Quibas is a karst outcrop with an age between 1.1 and 0.9 Ma (late Early Pleistocene). It represents the unique continuous sequence of terrestrial vertebrates of pre-Jaramillo to Jaramillo age in Europe. It is formed by two main structures: Quibas-Sima (divided into units QS-1 to QS-7) and Quibas-Cueva (QC-1– QC-6). In this work, we analyse the mineralogical composition of the sediments that form the stratigraphic units of Quibas-Sima using X-ray diffraction analysis, electrical conductivity, ion chromatography and optical emission spectrometry, to evaluate climatic trends in the sequence. Preliminary results indicate that there is an increase in the proportions of carbonates, gypsum and halite from QS-2 towards QS-4 and QS-5 (1.07–0.99 Ma), suggesting a progressive decrease in precipitation in south-eastern Iberian Peninsula a million years ago. Our data are consistent with the onset of a glacial phase, which is supported by the progressive disappearance of taxa related to forests and water bodies in Quibas-Sima, such as the flying squirrel Hylopetes sp. and the semiaquatic shrew Neomys sp., in favour of the appearance of taxa linked to open areas such as the Montpellier snake (Malpolon monspessulanus) and the snub-nosed viper (Vipera latastei). El yacimiento paleontológico de Quibas es un afloramiento kárstico con una edad comprendida entre 1,1 y 0,9 Ma (Pleistoceno Inferior tardío). Representa la única secuencia continua de vertebrados terrestres de edad pre-Jaramillo a Jaramillo de Europa. Está formado por dos estructuras principales: Quibas-Sima (dividida en las unidades QS-1 a QS-7) y Quibas-Cueva (QC-1 a QC-6). En este trabajo se estudia la composición mineralógica de los sedimentos que conforman las unidades estratigráficas de QuibasSima, a través e análisis de difracción de rayos X, conductividad eléctrica, cromatografía iónica y espectrometría de emisión óptica por plasma de argón, con el objetivo de evaluar tendencias paleoclimáticas en la secuencia. Los resultados preliminares indican que hay un aumento en las proporciones de carbonatos, yesos y halita desde QS-2 hacia QS-4 y QS-5 (1,07–0,99 Ma), lo que sugiere una progresiva disminución de las precipitaciones en el sureste peninsular hace un millón de años. Los datos son consistentes con el inicio de una fase glaciar, lo cual viene apoyado por la desaparición progresiva en Quibas-Sima de taxones afines a bosques y cursos de agua estables como la ardilla voladora Hylopetes sp. y el musgaño Neomys sp., en favor de la aparición de taxones ligados a espacios abiertos como la culebra bastarda (Malpolon monspessulanus) y la víbora hocicuda (Vipera latastei).