The Fluvial Macrophyte Index (IMF), a new tool to assess the ecological status of Mediterranean rivers [Índice de Macrófitos Fluviales (IMF), una nueva herramienta para evaluar el estado ecológico de los ríos mediterráneos]
Flor-Arnau N.,University of Barcelona |
Real M.,United Research Services Espana |
Gonzalez G.,United Research Services Espana |
Sanchez J.C.,University of Barcelona |
And 3 more authors.
Limnetica | Year: 2015
The Water Framework Directive (WFD) implementation requires the use of biological quality elements to assess ecological status in water bodies, including aquatic flora. Previous macrophyte indices have been developed for rivers in several Mediterranean regions of the Iberian peninsula. Due to the lack of a suitable tool that would consider macrophyte and physicochemical characteristics of all Spanish Mediterranean fluvial types, the Fluvial Macrophyte Index (IMF) was designed in compliance with WFD. We have worked with the identified samples collected from 177 sites and with the data from 121 extra sites from projects carried out in the Ebro basin and in Catalonia. IMF includes tolerance values and ecological range of 124 taxa (50 angiosperms, 31 alg, 30 mosses, 8 liverworts and 5 pteridophytes). IMF scores are obtained from the Zelinka and Marvan's (1961) formula and the value is then assigned to the corresponding quality class according to the WFD. This assignment is based on the fluvial group to whom the sampling site corresponds. Each group includes several Mediterranean river types based on their similarity of macrophyte inventories and for each of them the reference values and thresholds between quality classes have been calculated. The IMF has been correlated with other macrophyte indices, as well as with hydromorphological indices and physicochemical variables. Most of the correlations are significant and the obtained coefficients are high. In addition, the IMF is able to statistically discriminate reference sites from perturbed sites in most of the fluvial groups. Moreover, if the indices contained in the Water Planning Instruction (Ministerial Order ARM/2656/2008, 10 September) are applied, the IMF shows a high discrimination efficiency between sites with good or higher ecological status and the rest. Therefore, the IMF is proposed as an effective ecological tool to assess the ecological status of Mediterranean rivers. © Asociación Ibérica de Limnología Madrid.
Analysis and occurrence of selected medium to highly polar pesticides in groundwater of Catalonia (NE Spain): An approach based on on-line solid phase extraction-liquid chromatography-electrospray-tandem mass spectrometry detection
Postigo C.,CSIC - Institute of Environmental Assessment And Water Research |
Lopez de Alda M.J.,CSIC - Institute of Environmental Assessment And Water Research |
Barcelo D.,CSIC - Institute of Environmental Assessment And Water Research |
Barcelo D.,Catalan Institute for Water Research |
And 3 more authors.
Journal of Hydrology | Year: 2010
The present work describes an automated methodology based on on-line solid phase extraction-liquid chromatography-electrospray-tandem mass spectrometry (on-line SPE-LC-ESI-MS/MS) for the determination of 22 medium to highly polar pesticides in groundwater, and its application to the analysis of 133 samples collected from different aquifers of Catalonia (NE Spain), in areas where agricultural practice is significant. Sample preconcentration was performed by passing 5 mL of the sample through PLRPs cartridges (for analysis of 16 pesticides measured in the positive ionization mode) and through Hysphere-Resin GP cartridges (for analysis of six pesticides measured in the negative ionization mode). Further LC-MS/MS determination was performed in the selected reaction monitoring (SRM) mode, by recording two SRM transitions per compound, thus obtaining four identification points. The methodology developed allows the determination of the target compounds at the pg or low ng L-1 level with satisfactory precision (relative standard deviations lower than 16%) and accuracy (recovery percentages higher than 75%) and is well suited for routine monitoring. Its application to various groundwater samples from Catalonia has revealed simazine, diuron and atrazine (present in more than 70% of the samples) as the most ubiquitous compounds. Approximately 16% of the samples investigated had individual pesticides levels above 100 ng L-1 and 7% presented total pesticides levels above 500 ng L-1. Concentrations higher than 100 ng L-1 were found for all triazines studied but cyanazine, the phenylureas diuron, linuron and chlortoluron, the target chloroacetanilides alachlor and metolachlor, and the organophosphate dimethoate in a few samples. Three and eight out of the 16 investigated groundwater bodies presented total pesticide levels exceeding the EU quality standards in terms of individual and total pesticide concentrations, 100 and 500 ng L-1, respectively. © 2009 Elsevier B.V. All rights reserved.
Prat N.,University of Barcelona |
Munne A.,Agencia Catalana Del Agua
Limnetica | Year: 2014
A Decalogue summarizing the experience over 30 years in biomonitoring is provided by the authors with two main focuses, the use of macroinvertebrates as biological indicators, and the design of systems to evaluate the ecological status in rivers and streams. After a general introduction and a summary of the origins of biomonitoring in Spain, the authors examine the papers on this topic published in the Limnetica journal. The authors use the data of such papers to illustrate the points that have to be taken into account in order to design biomonitoring programs, and summarized these ideas in a Decalogue. The Decalogue contents all required steps to produce a proper biomonitoring system that will be normative compliant with the specifications of theWater Framework Directive (WFD). The 10 parts of the Decalogue are: 1) how to establish a sampling network; 2) human and material resources available for sampling; 3) definition of the river typologies; 4) how to establish the reference conditions; 5) sampling protocols to be used; 6) biological metrics to be applied; 7) setting the threshold between the different quality classes and its relationship with the pressures; 8) ecological quality maps and output system by using the EQR (Ecological Quality Ratio); 9) quality standards and control; 10) setting the quality objectives and definition of the adequate measures to recover water quality issues. In the Limnetica journal since 1981, a total of 641 papers on aquatic ecology have been published, 42% were on rivers and 18% specifically in biomonitoring. Most of the published papers in biomonitoring used macroinvertebrates (88%), while less than 20% used the reference condition and/or river typology approach to set the quality classes thresholds. However, despite the existence of theWFD since the year 2000, many papers published in Limnetica after 2002 (at this year a Limnetica's special issue on biomonitoring in Mediterranean streams was published), do not met the requirements of this Directive. Today, given the experience gained in the implementation of the WFD any biomonitoring system developed in Europe must be comparable to the existing ones and especially with the common intercalibration metric (ICM).The Decalogue present the necessary steps for a system to be compliant with the WFD regulations. © Asociación Ibérica de Limnología, Madrid. Spain.