Are there so many congeneric species of chironomid larvae in a small stream?

The co-occurrence of larvae of congeneric chironomid species is common in natural stream assemblages, and raises the problem of finding mechanisms to explain the co-existence of species with similar ecological requirements. In this contribution, we explored the co-occurrence of chironomid larvae bel...

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Detalhes bibliográficos
Autores: Prat i Fornells, Narcís, García-Roger, Eduardo
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/127407
Acesso em linha:https://hdl.handle.net/2445/127407
Access Level:acceso abierto
Palavra-chave:Dípters
Mediterrània (Regió)
Cursos d'aigua
Diptera
Mediterranean Region
Rivers
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spelling Are there so many congeneric species of chironomid larvae in a small stream?Prat i Fornells, NarcísGarcía-Roger, EduardoDíptersMediterrània (Regió)Cursos d'aiguaDipteraMediterranean RegionRiversThe co-occurrence of larvae of congeneric chironomid species is common in natural stream assemblages, and raises the problem of finding mechanisms to explain the co-existence of species with similar ecological requirements. In this contribution, we explored the co-occurrence of chironomid larvae belonging to congeneric species within four genera of chironomids: Cricotopus, Eukiefferiella, Orthocladius and Rheocricotopus (with 2, 7, 2 and 4 species, respectively) in the headwaters of a small Mediterranean calcareous stream. Due to the intrinsic, natural spatial and temporal variability in these habitats, we studied three different sites at two different seasons within the annual hydrological cycle (spring vs summer samples), and each microhabitat unit was surveyed with an effort proportional to its cover at the sampling site. The Outlying Median Index method was used to distinguish the niches of the different chironomid species in relation to the hydraulic features and substrates within each site. Our results showed that hydraulic features helped to improve discrimination between the niches of five congeneric species of Eukiefferiella, and the same occurred within the species belonging to Cricotopus and Orthocladius, although niche overlap was high in general. One Rheocricotopus species was associated to algal substrate. Schoener's co-occurrence at the microhabitat scale was low among the congeneric species found in our study, suggesting exclusion mechanisms. Flow regime, substrate type and shifts in environmental conditions may favor the settlement of some species to the detriment of other congeneric ones, but other mechanisms such as lottery competition, diffusion competition or predation should be considered in further studies.PAGEPress2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/127407Articles 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/10.4081/jlimnol.2018.1757Journal of Limnology, 2018, vol. 77, num. 1, p. 65-80https://doi.org/10.4081/jlimnol.2018.1757cc-by-nc (c) PAGEPress, 2018http://creativecommons.org/licenses/by-nc/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1274072026-05-27T06:46:51Z
dc.title.none.fl_str_mv Are there so many congeneric species of chironomid larvae in a small stream?
title Are there so many congeneric species of chironomid larvae in a small stream?
spellingShingle Are there so many congeneric species of chironomid larvae in a small stream?
Prat i Fornells, Narcís
Dípters
Mediterrània (Regió)
Cursos d'aigua
Diptera
Mediterranean Region
Rivers
title_short Are there so many congeneric species of chironomid larvae in a small stream?
title_full Are there so many congeneric species of chironomid larvae in a small stream?
title_fullStr Are there so many congeneric species of chironomid larvae in a small stream?
title_full_unstemmed Are there so many congeneric species of chironomid larvae in a small stream?
title_sort Are there so many congeneric species of chironomid larvae in a small stream?
dc.creator.none.fl_str_mv Prat i Fornells, Narcís
García-Roger, Eduardo
author Prat i Fornells, Narcís
author_facet Prat i Fornells, Narcís
García-Roger, Eduardo
author_role author
author2 García-Roger, Eduardo
author2_role author
dc.subject.none.fl_str_mv Dípters
Mediterrània (Regió)
Cursos d'aigua
Diptera
Mediterranean Region
Rivers
topic Dípters
Mediterrània (Regió)
Cursos d'aigua
Diptera
Mediterranean Region
Rivers
description The co-occurrence of larvae of congeneric chironomid species is common in natural stream assemblages, and raises the problem of finding mechanisms to explain the co-existence of species with similar ecological requirements. In this contribution, we explored the co-occurrence of chironomid larvae belonging to congeneric species within four genera of chironomids: Cricotopus, Eukiefferiella, Orthocladius and Rheocricotopus (with 2, 7, 2 and 4 species, respectively) in the headwaters of a small Mediterranean calcareous stream. Due to the intrinsic, natural spatial and temporal variability in these habitats, we studied three different sites at two different seasons within the annual hydrological cycle (spring vs summer samples), and each microhabitat unit was surveyed with an effort proportional to its cover at the sampling site. The Outlying Median Index method was used to distinguish the niches of the different chironomid species in relation to the hydraulic features and substrates within each site. Our results showed that hydraulic features helped to improve discrimination between the niches of five congeneric species of Eukiefferiella, and the same occurred within the species belonging to Cricotopus and Orthocladius, although niche overlap was high in general. One Rheocricotopus species was associated to algal substrate. Schoener's co-occurrence at the microhabitat scale was low among the congeneric species found in our study, suggesting exclusion mechanisms. Flow regime, substrate type and shifts in environmental conditions may favor the settlement of some species to the detriment of other congeneric ones, but other mechanisms such as lottery competition, diffusion competition or predation should be considered in further studies.
publishDate 2018
dc.date.none.fl_str_mv 2018
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/2445/127407
url https://hdl.handle.net/2445/127407
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/10.4081/jlimnol.2018.1757
Journal of Limnology, 2018, vol. 77, num. 1, p. 65-80
https://doi.org/10.4081/jlimnol.2018.1757
dc.rights.none.fl_str_mv cc-by-nc (c) PAGEPress, 2018
http://creativecommons.org/licenses/by-nc/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc (c) PAGEPress, 2018
http://creativecommons.org/licenses/by-nc/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv PAGEPress
publisher.none.fl_str_mv PAGEPress
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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