Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators

Seasonal droughts in Mediterranean streams shape their physical, chemical, and biological characteristics. Thus, droughts have the potential to alter resources at the base of the food web, which in headwater streams are primarily allochthonous and secondarily autochthonous organic matter (OM). In th...

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Autores: Sanpera Calbet, Isis, Ylla, I., Romaní i Cornet, Anna M., Sabater, Sergi, Muñoz Gràcia, Isabel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/130031
Acceso en línea:https://hdl.handle.net/2445/130031
Access Level:acceso abierto
Palabra clave:Sequeres
Mediterrània (Regió)
Cursos d'aigua
Àcids grassos
Droughts
Mediterranean Region
Rivers
Fatty acids
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spelling Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicatorsSanpera Calbet, IsisYlla, I.Romaní i Cornet, Anna M.Sabater, SergiMuñoz Gràcia, IsabelSequeresMediterrània (Regió)Cursos d'aiguaÀcids grassosDroughtsMediterranean RegionRiversFatty acidsSeasonal droughts in Mediterranean streams shape their physical, chemical, and biological characteristics. Thus, droughts have the potential to alter resources at the base of the food web, which in headwater streams are primarily allochthonous and secondarily autochthonous organic matter (OM). In the present study we assessed the quality of basal resources in a Mediterranean stream during a drought episode before and after a non-flow period (NF). Fatty acids (FA) and sterols were analyzed in the benthic substrata (leaves and sand and cobbles biofilm) and transported OM (particulate and dissolved fractions). FA and sterols were selected as indicators of resource quality because they include essential molecules for consumers and may be used as biomarkers of OM sources. The drying-rewetting process determined a general reduction in the total and essential FA of benthic substrata and transported particulate OM, and a shift from predominantly autochthonous to allochthonous OM. Furthermore, the sterol composition did not change between the drying and rewetting phases and the rewetting did not cause the leaching of FA in dissolved OM. The epilithic biofilm and leaves were the most important sources of essential FA and sterols, while the sand biofilm was the poorest source of these lipids. Our conclusions enhance the understanding of the mechanisms underlying the effects of droughts on basal resource quality in streams.Asociación Ibérica de Limnología2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/130031Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.23818/limn.36.03Limnetica, 2017, vol. 36, num. 1, p. 29-43https://doi.org/10.23818/limn.36.03(c) Sanpera Calbet, Isis et al., 2017info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1300312026-05-27T06:46:51Z
dc.title.none.fl_str_mv Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
title Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
spellingShingle Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
Sanpera Calbet, Isis
Sequeres
Mediterrània (Regió)
Cursos d'aigua
Àcids grassos
Droughts
Mediterranean Region
Rivers
Fatty acids
title_short Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
title_full Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
title_fullStr Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
title_full_unstemmed Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
title_sort Drought effects on resource quality in a Mediterranean stream: fatty acids and sterols as indicators
dc.creator.none.fl_str_mv Sanpera Calbet, Isis
Ylla, I.
Romaní i Cornet, Anna M.
Sabater, Sergi
Muñoz Gràcia, Isabel
author Sanpera Calbet, Isis
author_facet Sanpera Calbet, Isis
Ylla, I.
Romaní i Cornet, Anna M.
Sabater, Sergi
Muñoz Gràcia, Isabel
author_role author
author2 Ylla, I.
Romaní i Cornet, Anna M.
Sabater, Sergi
Muñoz Gràcia, Isabel
author2_role author
author
author
author
dc.subject.none.fl_str_mv Sequeres
Mediterrània (Regió)
Cursos d'aigua
Àcids grassos
Droughts
Mediterranean Region
Rivers
Fatty acids
topic Sequeres
Mediterrània (Regió)
Cursos d'aigua
Àcids grassos
Droughts
Mediterranean Region
Rivers
Fatty acids
description Seasonal droughts in Mediterranean streams shape their physical, chemical, and biological characteristics. Thus, droughts have the potential to alter resources at the base of the food web, which in headwater streams are primarily allochthonous and secondarily autochthonous organic matter (OM). In the present study we assessed the quality of basal resources in a Mediterranean stream during a drought episode before and after a non-flow period (NF). Fatty acids (FA) and sterols were analyzed in the benthic substrata (leaves and sand and cobbles biofilm) and transported OM (particulate and dissolved fractions). FA and sterols were selected as indicators of resource quality because they include essential molecules for consumers and may be used as biomarkers of OM sources. The drying-rewetting process determined a general reduction in the total and essential FA of benthic substrata and transported particulate OM, and a shift from predominantly autochthonous to allochthonous OM. Furthermore, the sterol composition did not change between the drying and rewetting phases and the rewetting did not cause the leaching of FA in dissolved OM. The epilithic biofilm and leaves were the most important sources of essential FA and sterols, while the sand biofilm was the poorest source of these lipids. Our conclusions enhance the understanding of the mechanisms underlying the effects of droughts on basal resource quality in streams.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/130031
url https://hdl.handle.net/2445/130031
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.23818/limn.36.03
Limnetica, 2017, vol. 36, num. 1, p. 29-43
https://doi.org/10.23818/limn.36.03
dc.rights.none.fl_str_mv (c) Sanpera Calbet, Isis et al., 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Sanpera Calbet, Isis et al., 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Asociación Ibérica de Limnología
publisher.none.fl_str_mv Asociación Ibérica de Limnología
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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