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The interplay of flow processes shapes aquatic invertebrate successions in floodplain channels - A modelling applied to restoration scenarios.
Marle, Pierre; Riquier, Jérémie; Timoner, Pablo; Mayor, Hélène; Slaveykova, Vera I; Castella, Emmanuel.
Afiliação
  • Marle P; Department F.A. Forel for Environmental and Aquatic Sciences, Section of Earth and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Carl-Vogt 66, CH-1211 Geneva, Switzerland. Electronic address: pierre.marle@unige.ch.
  • Riquier J; University of Lyon, UJM - Saint-Étienne, CNRS, EVS UMR 5600, 4 rue des basses rives, F-42023 Saint-Étienne, France.
  • Timoner P; Department F.A. Forel for Environmental and Aquatic Sciences, Section of Earth and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Carl-Vogt 66, CH-1211 Geneva, Switzerland.
  • Mayor H; Department F.A. Forel for Environmental and Aquatic Sciences, Section of Earth and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Carl-Vogt 66, CH-1211 Geneva, Switzerland.
  • Slaveykova VI; Department F.A. Forel for Environmental and Aquatic Sciences, Section of Earth and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Carl-Vogt 66, CH-1211 Geneva, Switzerland.
  • Castella E; Department F.A. Forel for Environmental and Aquatic Sciences, Section of Earth and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Carl-Vogt 66, CH-1211 Geneva, Switzerland.
Sci Total Environ ; 750: 142081, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-33182185
ABSTRACT
The high biotic diversity supported by floodplains is ruled by the interplay of geomorphic and hydrological processes at various time scales, from daily fluctuations to decennial successions. Because understanding such processes is a key question in river restoration, we attempted to model changes in taxonomic richness in an assemblage of 58 macroinvertebrate taxa (21 gastropoda and 37 ephemeroptera, plecoptera and trichoptera, EPT) along two successional sequences typical for former braided channels. Individual models relating the occurrence of taxa to overflow and backflow durations were developed from field measurements in 19 floodplain channels of the Rhône floodplain (France) monitored over 10 years. The models were combined to simulate diversity changes along a progressive alluviation and disconnection sequence after the reconnection with the main river of a previously isolated channel. Two scenarios were considered (i) an upstream + downstream reconnection creating a lotic channel, (ii) a downstream reconnection creating a semi-lotic channel. Reconnection led to a direct increase in invertebrate richness (on average x2.5). However, taxonomical richness showed a constant decrease as isolation progressed and reached an average of 2 for EPT and 7 for gastropods at the end of the scenarios. With more than 80% of the taxonomic models with an AUC equal or higher than 0.7 and slopes of linear relations between observed and predicted richness of 0.75 (gastropods) and 1 (EPT), the Boosted Regression Trees (BRT) provided a good basis for prediction of species assemblages. These models can be used to quantify a priori the sustainability and ecological efficiency of restoration actions and help floodplain restoration planning and management.
Assuntos
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Ecossistema / Invertebrados Tipo de estudo: Estudo prognóstico Limite: Animais País/Região como assunto: Europa Idioma: Inglês Revista: Sci Total Environ Ano de publicação: 2021 Tipo de documento: Artigo

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Ecossistema / Invertebrados Tipo de estudo: Estudo prognóstico Limite: Animais País/Região como assunto: Europa Idioma: Inglês Revista: Sci Total Environ Ano de publicação: 2021 Tipo de documento: Artigo