Pilar López

Pilar López
University of Barcelona | UB · Department of Ecology

About

52
Publications
9,081
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1,323
Citations
Citations since 2017
13 Research Items
779 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (52)
Poster
Full-text available
Phosphorus can accumulate for decades and centuries in the sediment of water bodies and can be continuously delivered to the water column, acting as an internal fertilization factor and making recovery from eutrophication difficult. Learning about the type and concentration of P fractions that are stored in sediments can help assess their origin an...
Data
In order to provide an integrated overview of the basic functioning of Lake Montcortès related to our modern analogue studies, a synthesis of the main processes and their spatial and temporal course is presented (Figure 10). This figure is intended to serve as a guide for high resolution paleoecological and paleoenvironmental reconstructions and de...
Article
Full-text available
In Quaternary paleosciences, the rationale behind analogical inference presupposes that 19 former processes can be explained by causes operating now, although their intensity and rates can 20 vary through time. In this paper we synthetize the results of different modern analogue studies 21 performed in a varved lake. We discuss their potential valu...
Article
The microbial decomposition of organic matter is a fundamental ecosystem process that transforms organic matter and fuels detritus-based food webs, influencing biogeochemical cycles such as C-cycling. The efficiency of this process can be compromised during the non-flow periods of intermittent and ephemeral streams (IRES). When water flow ceases, s...
Preprint
In the Quaternary paleosciences, the rationale behind analogical inference presupposes that former natural changes can be explained by causes operating now, although their intensity and rates can vary through time. In this paper we synthesise synthetize the results of different modern analog studies and discuss their value to obtain the best infere...
Article
Varved sediments provide unique opportunities to carry out high-resolution paleoclimatic and paleoenvironmental reconstructions with accurate time control. To better interpret the sediment record it is necessary to understand the physical, chemical and biological factors that influence varve formation and preservation. We explored the link between...
Article
Recent expansion of anoxia has become a global issue and there is potential for worsening under global warming. At the same time, obtaining proper long-term instrumental oxygen records is difficult, thus reducing the possibility of recording long-term changes in oxygen shifts that can be related with climate or human influence. Varved lake sediment...
Article
Full-text available
The present study aims to understand how microbial decomposition of leaf litter from two riparian tree species differing in their quality varies among streams covering a gradient of nutrient concentrations. We incubated leaf litter from alder (Alnus glutinosa) and sycamore (Platanus × hispanica) in 3 streams with low human pressure and 2 streams in...
Article
Full-text available
The aim of this research was to analyze the horizontal spatial heterogeneity of both water and superficial sediment quality among and within the reservoirs of the Cantareira System (CS), focusing on concentrations of N and P, attributed to the dumping of raw domestic sewage into water bodies, which is the main cause of water pollution in São Paulo...
Poster
Recent spread of anoxia in aquatic ecosystems has become an issue worldwide and is expected to increase with current global warming. Concern exists and different projects on this complex phenomenon are currently ongoing. At the same time, proper long-term instrumental oxygen records are scarce, thus reducing the possibility of recording long-term c...
Poster
Full-text available
Recent spread of anoxia in aquatic ecosystems has become an issue worldwide and is expected to increase with current global warming. Concern exists and different projects on this complex phenomenon are currently ongoing. At the same time, proper long-term instrumental oxygen records are scarce, thus reducing the possibility of recording long-term c...
Article
Full-text available
The potential for rivers to alter the flux of dissolved organic matter (DOM) from land to ocean is widely accepted. Yet anticipating when and where rivers behave as active reactors vs. passive pipes of DOM stands as a major knowledge gap in river biogeochemistry, resulting in uncertainties for global carbon models. Here, we investigate the controls...
Poster
Varved sediments are highly valuable environmental archives used for paleoenvironmental reconstructions. Changes in varvestructure, thickness and micro-facies features provide a continuous dataset of information if the local processes of varve formation are known. Varve formation depends on seasonally variable and significant fluxes of different co...
Article
Regulation alters the characteristics of rivers by transforming parts of them into lakes, affecting their hydrology and also the physical, chemical, and biological characteristics and dynamics. Reservoirs have proven to be very effective retaining particulate materials, thereby avoiding the downstream transport of suspended sediment and the chemica...
Article
The reservoir sediments are important sinks for organic carbon (OC), the OC burial being dependent on two opposite processes, deposition and mineralization. Hence factors such as severe water level fluctuations are expected to influence the rate of OC accumulation as they may affect both deposition and mineralization. The Barasona Reservoir has bee...
Poster
Varved sediments provide an extraordinary opportunity to obtain high-resolution paleoenviromental data and paleoecological information. To properly use these valuable achieves, it is necessary to know, understand and quantify the relationship between sedimentation and varve formation within the lake. This involves an accurate study of factors contr...
Article
Full-text available
Most lakes and reservoirs have surface CO2 concentrations that are supersaturated relative to the atmosphere1. The resulting CO2 emissions from lakes represent a substantial contribution to the continental carbon balance2, 3, 4. Thus, the drivers of CO2 supersaturation in lakes need to be understood to constrain the sensitivity of the land carbon c...
Article
Antibiotic resistance represents a growing global health concern due to the overuse and misuse of antibiotics. There is, however, little information about how the selective pressure of clinical antibiotic usage can affect environmental communities in aquatic ecosystems and which bacterial groups might be responsible for dissemination of antibiotic...
Article
Full-text available
To determine the spatial heterogeneity of the physical and chemical characteristics of superficial sediments from the Ribarroja Reservoir, we have analysed particle size distribution and concentrations of major (Al, Fe, Si, K, Ca, Mg, Ti, Mn and P) and minor (Mo, Nb, Zr, Y, Sr, Rb, Th, Pb, Sn, Ce, Ga, Zn, W, Cu, Co, Ni and V) elements at sixteen sit...
Article
The role of lacustrine systems in the global carbon cycle is a major topic in freshwater research. Most lakes release inorganic carbon to the atmosphere owing to the imbalance of net metabolism toward respiration. Most research on this topic relies on data collected in natural low-alkalinity lakes, and it therefore remains unclear what role human-m...
Article
Full-text available
Terminos Lagoon ecosystem is the largest fluvial-lagoon estuarine system in the country and one of the most important reserves of coastal flora and fauna in Mexico. Since the seventies, part of the main infrastructure for country's oil extraction is located in this area. Its high biodiversity has motivated different type of studies including defore...
Article
Full-text available
Histosols are potentially important in the global carbon cycle, since they show significant carbon accumulation. Variations in Histosol features may influence both vegetation types and carbon storage amounts and rates. In this paper, we compare Histosols of the Lower Orinoco River Delta by examining relationships among the vegetation communities th...
Article
Lopez, P., R. Marcé, J. Ordoñez, I. Irrutia and J. Armengol. 2009. Sedimentary phosphorus in a cascade of five reservoirs (Lozoya River, Central Spain). Lake Reserv. Manage. 25:39–48.The concentration of phosphorus (P), carbon (C), and nitrogen (N) in superficial sediments in a cascade of five reservoirs (Pinilla, Riosequillo, Puentes Viejas, El Vi...
Article
Hypolimnetic oxygen content in lentic ecosystems has traditionally been modeled as a function of variables measured at the epilimnion, or that are supposed to drive epilimnetic processes, like total phosphorus load. However, in man-made reservoirs the river inflow can plunge into deep layers, directly linking the hypolimnion with the surrounding wa...
Article
Full-text available
In the Neotropics, differences in phytogeographic patterns and species richness respond non-randomly to edaphic factors in many upland forests. However, whether wetland forests follow the same species differentiation patterns is not well known. In this paper we analyze the relationship among species occurrences and selected soil characteristics, pa...
Article
Full-text available
Reservoir sediments are important archives of biogeochemical data, reflecting ecological processes that occur at the watershed system. In this paper, a preliminary study of the limnological significance of major element composition and element ratios in sediments of Spanish reservoirs is presented, by analysing two data-sets from different limnolog...
Conference Paper
Full-text available
The Orinoco Delta is one of the world’s last great river deltas with pristine ecosystems. But it is also an important oil and gas reservoir area. Currently, little scientific and factual knowledge is available to assess the effect of oil exploitation activities. Understanding vegetation and soils relationships is fundamental to delineate conservati...
Article
Full-text available
El sedimento de los embalses constituye un importante registro de datos biogeoquímicos, ya que refleja los procesos ecológicos que tienen lugar en el conjunto de la cuenca hidrográfica. A partir del análisis de dos conjuntos de datos obtenidos en distintas regiones limnológicas, se presenta una aproximación preliminar al significado limnológico de...
Book
Full-text available
L’objectiu de l’Ecologia de segon curs de llicenciatura de Biologia és entendre com les relacions de les espècies entre elles i amb les condicions ambientals existents expliquen certes regularitats en la distribució i l’abundància dels individus de les diverses espècies. L’aproximació d’aquestes pràctiques és procurar una descripció abreujada i exp...
Article
Full-text available
Porewater concentrations and benthic fluxes of dissolved inorganic carbon (DIC), sulfate (SO4 2−), calcium (Ca2+), manganese (Mn), iron (Fe), ammonia (NH4 +), and soluble reactive phosphorus (DIP) were measured in the sediments of Albufera d’Es Grau (Minorca Island), a mesohaline lagoon, in Spring/early Summer. In this period, DIC and NH4 + were pr...
Article
The method for the sequential extraction of P proposed by Jensen et al. [Mcglathery, K.J., Marino, R., Howarth, R.W. (1998) Limnol. Oceanogr. 43, 799–810] was used to study the spatial distribution of sedimentary P in superficial sediments of a mesohaline coastal lagoon located in a watershed formed by carboniferous sandstone in the Western Mediter...
Article
The effect of a sudden increase in salinity from 10 to 37 in porewater concentration and the benthic fluxes of ammonium, calcium and dissolved inorganic carbon were studied in sediments of a small coastal lagoon, the Albufera d'Es Grau (Minorca Island, Spain). The temporal effects of the changes in salinity were examined over 17 days using a single...
Article
Full-text available
The concentrations of major and nutrient elements, (AI, Fe, Si, K, Ti, Ca, Mg, Mn, P, carbonate carbon, organic carbon, and N) in the sediments of a small, meromictic coastal lagoon (Es Cibollar, Majorca Island) were measured along a vertical profile in two core samples collected respectively two and eight months after a mixing event. The geochemic...
Article
The adsorption of phosphorus onto sediment particles has a major role in coastal areas, where continental inputs may increase levels of phosphate in the water mass. This paper reports a study of the adsorption capacity of phosphorus in two coastal areas located in the Balearic Islands: one in Majorca (The Albufera of Alcudia), and the other in Mino...
Article
The concentrations of nutrients in sediment pore water and the fluxes of nutrients at the water-sediment interface were measured in a channel that joins continental and marine areas in the Albufera of Majorca in order to evaluate the role of sediments in the nutrient dynamics in this system. Upstream, surficial pore water presented lower values of...
Article
Total phosphorus in sediment (Psed) and its fractional composition (reactive phosphate extracted with NaOH, NaOH-RP, reactive phosphate extracted with HCl, HCl-RP, and residual phosphate, residual-P) have been determined in superficial sediments of 43 Spanish reservoirs located in different limnological regions and with different trophic states. Da...
Article
The saturation index for calcium carbonate in water bodies located on the Spanish Mediterranean coastline has been calculated. Waters were supersaturated with respect to calcium carbonate, the saturation index being strongly correlated with pH and ionic strength and weakly correlated with the number of phytoplanktonic cells. Multiple regression ana...
Article
Seasonal variation of phosphate concentration and saturation index for calcite in water of a small stratified coastal lagoon have been studied. In surface waters, where salinity was low and pH high, the saturation index increased to values near 20, whereas in bottom water, with high salinity and low pH, they were usually lower. The ionic product fo...
Article
A limnological study was sustained from September 1980 to October 1981 to show the evolution of Gallocanta Lake (N.E. Spain) under very dry climatic conditions. It is the physical terminus within an endorheic basin of 500 km2 situated 1 000 m over the sea level. In 1977 its maximum depth was 2.5 m but it decreased to 60 cm in 1981 as a consequence...

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Projects (2)
Project
The last decade has seen a notable improvement in the understanding of late Holocene paleoclimatology. However, in parallel, the need to improve quantity and quality of natural paleoclimatic records has been stressed, as well as the need to implement methods to transform information contained in paleoclimatic records into quantitative climate information (transfer functions).The last two millennia house evidences of climate variability of greatest interest to be compared with current climate change. Thus, the basic strategy of paleoclimatology is to identify and to use natural variables (climate proxies) contained in natural records (eg. laminated sediments, growth rings) that have a simple, measurable relationship (linear regression) with a local climate variable, and then to construct time series in order to transform them into estimated time series of the climate variable with which they correlate. This method is known as high-resolution paleoclimatology and has provided detailed reconstructions that show the uniqueness of the twenty-first century climate change, if compared with milder changes climate of the last millennium. The present proposal represents the efforts of an interdisciplinary team of researchers from different national and international institutions to obtain paleoclimatic reconstructions of the past 500 years with a high resolution level (sub-decadalannual- seasonal). Specifically, we seek to investigate in detail the transition between natural climate variability since the late Little Ice Age (AD 1500) and the Industrial Age, which marks the advent of an era in which climate variability also reflects the increase of greenhouse gases of anthropogenic origin, distorting natural climate signals. For this purpose we have selected lake Montcortés (Catalonian Pre-Pyrenees), whose varved sediments offer a unique opportunity to carry out the proposed research. We pursue the following objectives: 1) To analyze the physico-chemical and biological nature of varves from lake sediments during the last 500 years, with paleoclimatic purposes. 2) To study the current annual cycle of main limnological and sedimentological mechanisms responsible for the formation of varves in Montcortès sediments, and to establish the time of their onset /occurence(climatic season of the year), through descriptor variables. This would help corroborate the hypotheses on origin of the varves. 3) To correlate instrumental climate data from the past 80 years with climatic proxies (pollen, diatoms, pigments) contained in the varves. In this way we want to obtain calibrations and transfer functions that allow for quantitative paleoclimatic estimates. 4) To assess indicator capacity of the proposed proxies as a group, several subgroups or individually, with respect to all available climatic parameters, and to identify possible cause- effect. 5) To compare these results and the obtained paleoclimatic inferences with existing dendroclimatic and dendroecological sequence for the same region and period. 6) To reconstruct, at the highest possible resolution level (annual / sub-decadal), the paleoclimatology of the last 500 years, trying to separate natural from anthropogenic causes. 7) To use the information obtained to visualize possible scenarios of climate change and organism’s responses. Our results would feed current databases used to calibrate and validate predictive models and the corresponding global simulations.