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The Effect of Multiple Stressors on Biological Communities in the Llobregat

This chapter reviews the diversity and composition of algal, invertebrate and fish communities in the Llobregat basin and analyses the factors affecting their distribution. Phytoplankton develops only during short periods and in particular areas where the hydraulic residence time is high. Diatoms are by far the most diverse and abundant in autotrophic benthic biofilms. The invertebrate community is highly rich taxonomically, whereas the native fish richness is relatively low, with about eight freshwater species and some others of marine origin. Some of the fish native species are threatened and two have been extirpated. Many exotic fish species have been introduced into the basin and are suspected to have contributed to the decline of native fish. Salt inputs, organic pollution and hydrological conditions lead to further alterations in water quality in the middle part of the river and downstream, thus reducing ecological quality. Multiple pressures on fluvial biodiversity severely compromise the integrity of this river’s ecosystem. To recover the structure and functioning of the biological communities, it is important to maintain the integrity of headwater ecosystems to ensure a species pool for colonisation downstream and reduce water abstraction, regulation and nutrient and pollutant inputs

This research was funded by the Spanish Ministry of Science and Innovation, projects SCARCE (Consolider-Ingenio 2010 program, CSD2009-00065), CGL2009-12877-C02-01 and CGL2011-30474-C02

© Sabater Sergi; Ginebreda, Antoni; Barceló, Damià (volume editors) (2012). The Llobregat: the story of a polluted Mediterranean river, p. 93-116. (The Handbook of Environmental Chemistry, núm. 21)

Springer Verlag

Manager: Ministerio de Ciencia e Innovación (Espanya)
Author: Muñoz Gràcia, Isabel
García-Berthou, Emili
Sabater, Emili
Date: 2012
Abstract: This chapter reviews the diversity and composition of algal, invertebrate and fish communities in the Llobregat basin and analyses the factors affecting their distribution. Phytoplankton develops only during short periods and in particular areas where the hydraulic residence time is high. Diatoms are by far the most diverse and abundant in autotrophic benthic biofilms. The invertebrate community is highly rich taxonomically, whereas the native fish richness is relatively low, with about eight freshwater species and some others of marine origin. Some of the fish native species are threatened and two have been extirpated. Many exotic fish species have been introduced into the basin and are suspected to have contributed to the decline of native fish. Salt inputs, organic pollution and hydrological conditions lead to further alterations in water quality in the middle part of the river and downstream, thus reducing ecological quality. Multiple pressures on fluvial biodiversity severely compromise the integrity of this river’s ecosystem. To recover the structure and functioning of the biological communities, it is important to maintain the integrity of headwater ecosystems to ensure a species pool for colonisation downstream and reduce water abstraction, regulation and nutrient and pollutant inputs
This research was funded by the Spanish Ministry of Science and Innovation, projects SCARCE (Consolider-Ingenio 2010 program, CSD2009-00065), CGL2009-12877-C02-01 and CGL2011-30474-C02
Format: application/pdf
ISBN: 978-3-642-30939-7
ISSN: 1867-979X
Document access: http://hdl.handle.net/10256/12991
Language: eng
Publisher: Springer Verlag
Collection: MICINN/PN 2009-2014/CSD2009-00065
MICINN/PN 2010-2012/CGL2009-12877-C02-01
MICINN/PN 2011-2013/CGL2011-30474-C02
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/698_2012_148
Llibres / Capítols de LLibre (D-CCAA)
Is part of: © Sabater Sergi; Ginebreda, Antoni; Barceló, Damià (volume editors) (2012). The Llobregat: the story of a polluted Mediterranean river, p. 93-116. (The Handbook of Environmental Chemistry, núm. 21)
Rights: Tots els drets reservats
Subject: Peixos d’aigua dolça
Freshwater fishes
Llobregat (Catalunya : Curs d’aigua) -- Aspectes ambientals
Llobregat (Catalonia : River) -- Environmental aspects
Ecologia d’aigua dolça -- Catalunya -- Llobregat (Curs d’aigua)
Freshwater ecology -- Catalonia -- Llobregat (River)
Title: The Effect of Multiple Stressors on Biological Communities in the Llobregat
Type: info:eu-repo/semantics/bookPart
Repository: DUGiDocs

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