Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams

Programa de Doctorat en Ecologia, Ciències Ambientals i Fisiologia Vegetal

Detalhes bibliográficos
Autor: Arias del Real, Rebeca
Tipo de documento: tese
Estado:Versão publicada
Data de publicação:2020
País:España
Recursos:CBUC, CESCA
Repositório:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/672714
Acesso em linha:http://hdl.handle.net/10803/672714
Access Level:Acceso aberto
Palavra-chave:Invertebrats marins
Invertebrados marinos
Marine invertebrates
Biodegradació
Biodegradación
Biodegradation
Fongs
Hongos
Fungi
Microbiologia aquàtica
Microbiología acuática
Water microbiology
Biodiversitat
Biodiversidad
Biodiversity
Ciències Experimentals i Matemàtiques
574
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spelling Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streamsArias del Real, RebecaInvertebrats marinsInvertebrados marinosMarine invertebratesBiodegradacióBiodegradaciónBiodegradationFongsHongosFungiMicrobiologia aquàticaMicrobiología acuáticaWater microbiologyBiodiversitatBiodiversidadBiodiversityCiències Experimentals i Matemàtiques574Programa de Doctorat en Ecologia, Ciències Ambientals i Fisiologia VegetalIntermittent rivers and ephemeral streams (IRES) are watercourses that naturally and periodically cease to flow. They represent more than half of the global river network and are expanding due to global change. In this thesis, I investigate the mechanisms linking flow intermittence with biodiversity and ecosystem functioning, which sustain biogeochemical cycles and energy transfer in the system. Chapter 1 analyzes the effects of hydrology, micro-habitat (surface and subsurface zones) and biotic features on organic matter decomposition and fungal biomass, in 20 streams. In Chapter 2, I assess the effect of different flow intermittence metrics (i.e., annual intermittence regime and recent aquatic status) on aquatic biodiversity, including both taxonomic and functional-trait-based metrics, in 33 streams. Chapter 3 analyzes how aquatic hyphomycete richness and composition (beta diversity and its turnover and nestedness components) are affected by a flow intermittence gradient and how these community changes affect organic matter decomposition, in 15 streams and in a microcosm approach. Finally, in Chapter 4, I explore how changes in both leaf litter quality and quantity determine the feeding preferences and growth of an invertebrate shredder. The results of Chapter 1 show that the subsurface zone contributes to maintaining microbial decomposition during non-flow periods in IRES, mainly because of the levels of fungal biomass present in the subsurface zone. In Chapter 2, I conclude that a combination of flow intermittence metrics are needed to explain the high dynamism of the invertebrate community in IRES and potentially ecosystem functioning. Moreover, this chapter shows that hydrological variables outweigh non-hydrological factors in explaining invertebrate community variation, thereby supporting the use of the former in IRES classification and bio-monitoring routines. Chapter 3 reveals that the reduction of aquatic hyphomycete richness and species turnover as a result of flow intermittence, could have negative effects on organic matter decomposition. Finally, in Chapter 4, I provide evidence on how flow intermittence reduces the quality of leaf litter, in terms of fungal richness and composition, fungal biomass and lipid content. These changes in food quality influence the consumption rates and growth of shredders, which are able to feed selectively on higher quality leaves, even though its availability is lower. Taken together, these results will help to improve the biomonitoring and management of IRES and to a better prediction of ecosystem trajectories in response to global change.Universitat de BarcelonaMuñoz Gràcia, IsabelMenéndez López, MargaritaMuñoz Gràcia, IsabelUniversitat de Barcelona. Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals202120212020info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion296 p.application/pdfapplication/pdfhttp://hdl.handle.net/10803/672714TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésL'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:www.tdx.cat:10803/6727142026-06-14T12:46:07Z
dc.title.none.fl_str_mv Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
title Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
spellingShingle Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
Arias del Real, Rebeca
Invertebrats marins
Invertebrados marinos
Marine invertebrates
Biodegradació
Biodegradación
Biodegradation
Fongs
Hongos
Fungi
Microbiologia aquàtica
Microbiología acuática
Water microbiology
Biodiversitat
Biodiversidad
Biodiversity
Ciències Experimentals i Matemàtiques
574
title_short Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
title_full Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
title_fullStr Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
title_full_unstemmed Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
title_sort Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams
dc.creator.none.fl_str_mv Arias del Real, Rebeca
author Arias del Real, Rebeca
author_facet Arias del Real, Rebeca
author_role author
dc.contributor.none.fl_str_mv Muñoz Gràcia, Isabel
Menéndez López, Margarita
Muñoz Gràcia, Isabel
Universitat de Barcelona. Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals
dc.subject.none.fl_str_mv Invertebrats marins
Invertebrados marinos
Marine invertebrates
Biodegradació
Biodegradación
Biodegradation
Fongs
Hongos
Fungi
Microbiologia aquàtica
Microbiología acuática
Water microbiology
Biodiversitat
Biodiversidad
Biodiversity
Ciències Experimentals i Matemàtiques
574
topic Invertebrats marins
Invertebrados marinos
Marine invertebrates
Biodegradació
Biodegradación
Biodegradation
Fongs
Hongos
Fungi
Microbiologia aquàtica
Microbiología acuática
Water microbiology
Biodiversitat
Biodiversidad
Biodiversity
Ciències Experimentals i Matemàtiques
574
description Programa de Doctorat en Ecologia, Ciències Ambientals i Fisiologia Vegetal
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10803/672714
url http://hdl.handle.net/10803/672714
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 296 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv TDX (Tesis Doctorals en Xarxa)
reponame:TDR. Tesis Doctorales en Red
instname:CBUC, CESCA
instname_str CBUC, CESCA
reponame_str TDR. Tesis Doctorales en Red
collection TDR. Tesis Doctorales en Red
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413856798834688
score 15,301603

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