We have conducted a monitoring survey and paleolimnological study of a WE transect of six high al... more We have conducted a monitoring survey and paleolimnological study of a WE transect of six high altitude lakes (1870-2630 m asl) in the western and central Pyrenees (Spain) to evaluate the regional response to current global change in high altitude Mediterranean mountains. The reconstructed Total Organic Carbon (TOC flux) and lithogenic (L flux) fluxes during the last 1200 years show the expected variability as lakes differ in altitude, geological and climate settings, limnological properties and human impact history. However, all show unique patterns after 1850 CE, particularly during the Great Acceleration (after 1950 CE). Recent L flux increase could be related to higher erodibility by rainfall and runoff during the longer snow-free season in the Pyrenees. In all sites, higher TOC flux and geochemical (lower δ 13 C OM , lower C/N) and biological (diatom assemblages) signatures since 1950 CE suggest an increase in algal productivity, likely favored by warmer temperatures and higher nutrient deposition. These recent, unprecedented L flux and TOC flux increases, in spite of their diverse history and limnological properties of the lakes, demonstrate the regional impact of the Great Acceleration not only in the ecological dynamics of alpine lakes but also in the hydrological cycle in high altitude mountain watersheds. Lakes are a central component of the carbon cycle and several paleolimnological studies have shown organic carbon burial rate increases during the last centuries, although the causes for regional variability, the specific involved processes, and likely future scenarios remain uncertain 1,2. At a global scale, recent changes in mountain lake dynamics have been related to climate variability, direct human impact in the watersheds 3-5 and increased global deposition rates of nutrients 6 , altering their structure, functioning and diversity 7 and causing eutrophication and pollution 8,9. To assess the recent rates of response and vulnerability of ecosystems and territories to rapid shifts of the Earth System they have to be evaluated in the context of the Anthropocene 10 and the current Great Acceleration 11 (GA). In particular, Mediterranean mountains face great environmental risks as temperature and precipitation regimes 12 and human pressure 4,5,13 have changed during the last century. A clear example of such trends are documented in the Pyrenees where, since 1959, the annual mean temperature has increased by more than 1.6 °C and summer temperature by more than 2.3 °C. The decrease in annual precipitation has been small (-2.5%, last 50 years) but winter rainfall events are now more frequent 14 .The high altitude lakes in the Pyrenees provide an opportunity to investigate the role of climate change and human activities in carbon and sediment dynamics, as past climate variability 5,15-23 and the history of human impacts are relatively well known 24. Human activities had a restricted impact till the onset of ca.twelfth century deforestation phase 24,25. The abandonment of traditional agropastoral
... 2006 Ricardo Prego / U Otxotorena / A Cobelo García PRESENCIA DE CR, CU, FE Y PB EN EL SEDIME... more ... 2006 Ricardo Prego / U Otxotorena / A Cobelo García PRESENCIA DE CR, CU, FE Y PB EN EL SEDIMENTO BAJO LAS BATEAS DE CULTIVO DE MEJILLÓN (RÍAS DE AROSA Y VIGO, NO DE ESPAÑA): ¿ES UN ÁREA CONTAMINADA POR METALES? ... Zone Arosa Vigo ...
Suspension in the mixing zones near the mouths of small rivers flowing into Kandalaksha Bay is an... more Suspension in the mixing zones near the mouths of small rivers flowing into Kandalaksha Bay is analyzed. It is shown that water mixing results in quantitative and qualitative changes in particulate matter, as well as changes in the concentrations and composition of the constituent components of such matter. Particulate matter concentrations decrease from 1.5 mg/l in the riverine part of the estuaries to <0.5 mg/l in their marine areas. Riverine water transports mainly organic terrigenous particulate matter. Under a salinity increase from 2 to 12‰, physicochemical processes concentrate coagulated alumosilicates, which increases the content of mineral matter. The further increase in salinity and decrease in the particulate matter content leads to the intense development of plankton, and thus the role of marine organic matter in the particulate matter grows. Vertical particle fluxes in the productive layer of the deep-water part of the bay are formed mainly due to biogenic (diatomaceous) material. In the lower layers, these fluxes involve terrigenous mineral components from the bottom sediments, entrained by tidal currents. The species composition of diatoms, sampled by sediment traps at depths of 55 and 270 m, is characterized.Peer Reviewe
Multidisciplinary oceanographic studies of the White Sea were carried out in the regions of the G... more Multidisciplinary oceanographic studies of the White Sea were carried out in the regions of the Gorlo, of the Basin, and of Kandalaksha Bay including the estuaries of the Niva, Kolvitsa, and Knyazhaya rivers. The hydrographic survey revealed long-living stepwise structures and inversions in the vertical profiles of temperature and salinity formed due to the tidal mixing of saline and cold Barents Sea waters and warmer White Sea waters in the Gorlo area. The biological studies revealed the principal features of the distribution, abundance, and species composition of phyto-and zooplankton in all the areas studied. They showed the tolerance of the principal zooplankton species to desalination in the estuaries. The studies of the suspended matter in the estuaries clearly demonstrated physical and chemical transformations of the matter supplied by the rivers. The data on the vertical particle flux in the deep-water part of Kandalaksha Bay showed the difference between the subsurface layer and the near-bottom layer, which could result from the sinking of the products of the spring phytoplankton bloom and from the supply of the suspended terrigenous matter from the nepheloid layer formed by the tidal currents.
Introducción En noviembre de 2002 el buque Prestige, con una carga de 77,000 toneladas de fuel pe... more Introducción En noviembre de 2002 el buque Prestige, con una carga de 77,000 toneladas de fuel pesado (Fundación Alternativas 2003) y después de varios días sometido a duras condiciones en el mar acaba hundido a 133 millas náuticas del Cabo Finisterre. Este accidente ha sido considerado como uno de los más graves ocurrido en las costas gallegas (
Assessment of the environmental impact of platinum group elements (PGE) and other trace elements ... more Assessment of the environmental impact of platinum group elements (PGE) and other trace elements from mining activities is essential to prevent potential environmental risks. This study evaluates the concentrations of PGE in stream sediments of the Hex River, which drains the mining area of the Bushveld Igneous Complex (South Africa), at four sampling points. Major, minor and trace elements (Fe,
The spatial distribution of phytoplankton assemblages, chlorophyll, primary production and physic... more The spatial distribution of phytoplankton assemblages, chlorophyll, primary production and physical and chemical parameters were studied in the Pontevedra Ria in Galicia (NW Iberian Peninsula) from October 1997 to October 1998. In addition to the usual oceanographic periods described for the Galician Coast, two other periods were observed: a Prebloom or winter bloom, occurring during calm, sunny days in winter
58th EHPRG Meeting on High Pressure Science and Technology, 6-11 September 2020, Tenerife, SpainC... more 58th EHPRG Meeting on High Pressure Science and Technology, 6-11 September 2020, Tenerife, SpainCanning is one of the most important means of fish preservation. In it, two thermal steps (cooking and sterilisation) are encountered, so that both enzymes and bacteria should be inactivated provided reinfection does not occur and no negative interaction with the container is produced [1]. Thus, the majority of quality problems found in canned fish products can be related to the quality of raw material, which continuously changes during storage as a result of different factors; among such factors, the high content on polyunsaturated fatty acids is considered of great significance. For many decades, canneries have employed the frozen storage as the main strategy to keep excess material prior to canning. However, when long storage periods and/or relatively lowfrozen temperatures are employed, activity of endogenous enzymes can lead to important quality losses in frozen fish [2]. Interestingly, high-pressure processing (HPP) has shown to retain the sensory and nutritional properties of food while inactivating microbial growth and endogenous enzyme activity [3]. This latest effect ought to be especially profitable when employed before fish frozen storage, as inhibiting the pro-oxidative effect of some endogenous enzymes during such periodThe work was supported by the Consejo Superior de Investigaciones Científicas (CSIC) (Spain) through the Research Project 2017-70E032, by Fundação para a Ciência e a Tecnologia (FCT Portugal), European Union, QRN, FEDER, COMPETE through founding of the Organic Chemistry Research Unit (QOPNA) (project PEst-C/QUI/UI0062/2013; FCOMP-01-0124-FEDER-037296), and by Formula Grants no. 2011-31200-06041 and 2012-31200-06041 from the USDA National Institute of Food and AgricultuPeer reviewe
This dataset is composed of 2 files. Main one is the data set itself (arios_database_hy1.csv) in ... more This dataset is composed of 2 files. Main one is the data set itself (arios_database_hy1.csv) in WHP-Exchange bottle format, with 1421 samples of temperature, salinity, oxygen, nutrients, pH, alkalinity, and chlorophyll. The other file (readme_ARIOSDATABASE.txt) includes a short description of the the database and calculated variables
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
We have conducted a monitoring survey and paleolimnological study of a WE transect of six high al... more We have conducted a monitoring survey and paleolimnological study of a WE transect of six high altitude lakes (1870-2630 m asl) in the western and central Pyrenees (Spain) to evaluate the regional response to current global change in high altitude Mediterranean mountains. The reconstructed Total Organic Carbon (TOC flux) and lithogenic (L flux) fluxes during the last 1200 years show the expected variability as lakes differ in altitude, geological and climate settings, limnological properties and human impact history. However, all show unique patterns after 1850 CE, particularly during the Great Acceleration (after 1950 CE). Recent L flux increase could be related to higher erodibility by rainfall and runoff during the longer snow-free season in the Pyrenees. In all sites, higher TOC flux and geochemical (lower δ 13 C OM , lower C/N) and biological (diatom assemblages) signatures since 1950 CE suggest an increase in algal productivity, likely favored by warmer temperatures and higher nutrient deposition. These recent, unprecedented L flux and TOC flux increases, in spite of their diverse history and limnological properties of the lakes, demonstrate the regional impact of the Great Acceleration not only in the ecological dynamics of alpine lakes but also in the hydrological cycle in high altitude mountain watersheds. Lakes are a central component of the carbon cycle and several paleolimnological studies have shown organic carbon burial rate increases during the last centuries, although the causes for regional variability, the specific involved processes, and likely future scenarios remain uncertain 1,2. At a global scale, recent changes in mountain lake dynamics have been related to climate variability, direct human impact in the watersheds 3-5 and increased global deposition rates of nutrients 6 , altering their structure, functioning and diversity 7 and causing eutrophication and pollution 8,9. To assess the recent rates of response and vulnerability of ecosystems and territories to rapid shifts of the Earth System they have to be evaluated in the context of the Anthropocene 10 and the current Great Acceleration 11 (GA). In particular, Mediterranean mountains face great environmental risks as temperature and precipitation regimes 12 and human pressure 4,5,13 have changed during the last century. A clear example of such trends are documented in the Pyrenees where, since 1959, the annual mean temperature has increased by more than 1.6 °C and summer temperature by more than 2.3 °C. The decrease in annual precipitation has been small (-2.5%, last 50 years) but winter rainfall events are now more frequent 14 .The high altitude lakes in the Pyrenees provide an opportunity to investigate the role of climate change and human activities in carbon and sediment dynamics, as past climate variability 5,15-23 and the history of human impacts are relatively well known 24. Human activities had a restricted impact till the onset of ca.twelfth century deforestation phase 24,25. The abandonment of traditional agropastoral
... 2006 Ricardo Prego / U Otxotorena / A Cobelo García PRESENCIA DE CR, CU, FE Y PB EN EL SEDIME... more ... 2006 Ricardo Prego / U Otxotorena / A Cobelo García PRESENCIA DE CR, CU, FE Y PB EN EL SEDIMENTO BAJO LAS BATEAS DE CULTIVO DE MEJILLÓN (RÍAS DE AROSA Y VIGO, NO DE ESPAÑA): ¿ES UN ÁREA CONTAMINADA POR METALES? ... Zone Arosa Vigo ...
Suspension in the mixing zones near the mouths of small rivers flowing into Kandalaksha Bay is an... more Suspension in the mixing zones near the mouths of small rivers flowing into Kandalaksha Bay is analyzed. It is shown that water mixing results in quantitative and qualitative changes in particulate matter, as well as changes in the concentrations and composition of the constituent components of such matter. Particulate matter concentrations decrease from 1.5 mg/l in the riverine part of the estuaries to <0.5 mg/l in their marine areas. Riverine water transports mainly organic terrigenous particulate matter. Under a salinity increase from 2 to 12‰, physicochemical processes concentrate coagulated alumosilicates, which increases the content of mineral matter. The further increase in salinity and decrease in the particulate matter content leads to the intense development of plankton, and thus the role of marine organic matter in the particulate matter grows. Vertical particle fluxes in the productive layer of the deep-water part of the bay are formed mainly due to biogenic (diatomaceous) material. In the lower layers, these fluxes involve terrigenous mineral components from the bottom sediments, entrained by tidal currents. The species composition of diatoms, sampled by sediment traps at depths of 55 and 270 m, is characterized.Peer Reviewe
Multidisciplinary oceanographic studies of the White Sea were carried out in the regions of the G... more Multidisciplinary oceanographic studies of the White Sea were carried out in the regions of the Gorlo, of the Basin, and of Kandalaksha Bay including the estuaries of the Niva, Kolvitsa, and Knyazhaya rivers. The hydrographic survey revealed long-living stepwise structures and inversions in the vertical profiles of temperature and salinity formed due to the tidal mixing of saline and cold Barents Sea waters and warmer White Sea waters in the Gorlo area. The biological studies revealed the principal features of the distribution, abundance, and species composition of phyto-and zooplankton in all the areas studied. They showed the tolerance of the principal zooplankton species to desalination in the estuaries. The studies of the suspended matter in the estuaries clearly demonstrated physical and chemical transformations of the matter supplied by the rivers. The data on the vertical particle flux in the deep-water part of Kandalaksha Bay showed the difference between the subsurface layer and the near-bottom layer, which could result from the sinking of the products of the spring phytoplankton bloom and from the supply of the suspended terrigenous matter from the nepheloid layer formed by the tidal currents.
Introducción En noviembre de 2002 el buque Prestige, con una carga de 77,000 toneladas de fuel pe... more Introducción En noviembre de 2002 el buque Prestige, con una carga de 77,000 toneladas de fuel pesado (Fundación Alternativas 2003) y después de varios días sometido a duras condiciones en el mar acaba hundido a 133 millas náuticas del Cabo Finisterre. Este accidente ha sido considerado como uno de los más graves ocurrido en las costas gallegas (
Assessment of the environmental impact of platinum group elements (PGE) and other trace elements ... more Assessment of the environmental impact of platinum group elements (PGE) and other trace elements from mining activities is essential to prevent potential environmental risks. This study evaluates the concentrations of PGE in stream sediments of the Hex River, which drains the mining area of the Bushveld Igneous Complex (South Africa), at four sampling points. Major, minor and trace elements (Fe,
The spatial distribution of phytoplankton assemblages, chlorophyll, primary production and physic... more The spatial distribution of phytoplankton assemblages, chlorophyll, primary production and physical and chemical parameters were studied in the Pontevedra Ria in Galicia (NW Iberian Peninsula) from October 1997 to October 1998. In addition to the usual oceanographic periods described for the Galician Coast, two other periods were observed: a Prebloom or winter bloom, occurring during calm, sunny days in winter
58th EHPRG Meeting on High Pressure Science and Technology, 6-11 September 2020, Tenerife, SpainC... more 58th EHPRG Meeting on High Pressure Science and Technology, 6-11 September 2020, Tenerife, SpainCanning is one of the most important means of fish preservation. In it, two thermal steps (cooking and sterilisation) are encountered, so that both enzymes and bacteria should be inactivated provided reinfection does not occur and no negative interaction with the container is produced [1]. Thus, the majority of quality problems found in canned fish products can be related to the quality of raw material, which continuously changes during storage as a result of different factors; among such factors, the high content on polyunsaturated fatty acids is considered of great significance. For many decades, canneries have employed the frozen storage as the main strategy to keep excess material prior to canning. However, when long storage periods and/or relatively lowfrozen temperatures are employed, activity of endogenous enzymes can lead to important quality losses in frozen fish [2]. Interestingly, high-pressure processing (HPP) has shown to retain the sensory and nutritional properties of food while inactivating microbial growth and endogenous enzyme activity [3]. This latest effect ought to be especially profitable when employed before fish frozen storage, as inhibiting the pro-oxidative effect of some endogenous enzymes during such periodThe work was supported by the Consejo Superior de Investigaciones Científicas (CSIC) (Spain) through the Research Project 2017-70E032, by Fundação para a Ciência e a Tecnologia (FCT Portugal), European Union, QRN, FEDER, COMPETE through founding of the Organic Chemistry Research Unit (QOPNA) (project PEst-C/QUI/UI0062/2013; FCOMP-01-0124-FEDER-037296), and by Formula Grants no. 2011-31200-06041 and 2012-31200-06041 from the USDA National Institute of Food and AgricultuPeer reviewe
This dataset is composed of 2 files. Main one is the data set itself (arios_database_hy1.csv) in ... more This dataset is composed of 2 files. Main one is the data set itself (arios_database_hy1.csv) in WHP-Exchange bottle format, with 1421 samples of temperature, salinity, oxygen, nutrients, pH, alkalinity, and chlorophyll. The other file (readme_ARIOSDATABASE.txt) includes a short description of the the database and calculated variables
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Uploads
Papers by Ricardo Prego