Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Neotropical ichthyology (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210 |
Resumo: | ABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended to increase downstream. Migratory fishes showed opposed trends, with higher richness and biomass upstream, particularly catfishes (Siluriformes). Ordination analyses separated sites in three groups based on variations in composition and abundance, and revealed associations between these groups and specific hydro-geomorphic conditions (i.e., flow, depth, channel width and the presence of riparian vegetation). Our study revealed that fish diversity distributes heterogeneously along the main channel, where hydro-geomorphic patches select for distinct assemblages along riverine gradients. |
id |
SBI-1_59869426bb8a2c9618dfa614ebcfe554 |
---|---|
oai_identifier_str |
oai:scielo:S1679-62252019000500210 |
network_acronym_str |
SBI-1 |
network_name_str |
Neotropical ichthyology (Online) |
repository_id_str |
|
spelling |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay RiverDiversityFloodplainMigratory fishRiparian vegetationRiver channelABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended to increase downstream. Migratory fishes showed opposed trends, with higher richness and biomass upstream, particularly catfishes (Siluriformes). Ordination analyses separated sites in three groups based on variations in composition and abundance, and revealed associations between these groups and specific hydro-geomorphic conditions (i.e., flow, depth, channel width and the presence of riparian vegetation). Our study revealed that fish diversity distributes heterogeneously along the main channel, where hydro-geomorphic patches select for distinct assemblages along riverine gradients.Sociedade Brasileira de Ictiologia2019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210Neotropical Ichthyology v.17 n.4 2019reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/1982-0224-20190043info:eu-repo/semantics/openAccessMassaro,Marthoni ViniciusPachla,Lucas AdrianoBastian,RodrigoPelicice,Fernando MayerReynalte-Tataje,David Augustoeng2019-12-05T00:00:00Zoai:scielo:S1679-62252019000500210Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2019-12-05T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false |
dc.title.none.fl_str_mv |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
title |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
spellingShingle |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River Massaro,Marthoni Vinicius Diversity Floodplain Migratory fish Riparian vegetation River channel |
title_short |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
title_full |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
title_fullStr |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
title_full_unstemmed |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
title_sort |
Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River |
author |
Massaro,Marthoni Vinicius |
author_facet |
Massaro,Marthoni Vinicius Pachla,Lucas Adriano Bastian,Rodrigo Pelicice,Fernando Mayer Reynalte-Tataje,David Augusto |
author_role |
author |
author2 |
Pachla,Lucas Adriano Bastian,Rodrigo Pelicice,Fernando Mayer Reynalte-Tataje,David Augusto |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Massaro,Marthoni Vinicius Pachla,Lucas Adriano Bastian,Rodrigo Pelicice,Fernando Mayer Reynalte-Tataje,David Augusto |
dc.subject.por.fl_str_mv |
Diversity Floodplain Migratory fish Riparian vegetation River channel |
topic |
Diversity Floodplain Migratory fish Riparian vegetation River channel |
description |
ABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended to increase downstream. Migratory fishes showed opposed trends, with higher richness and biomass upstream, particularly catfishes (Siluriformes). Ordination analyses separated sites in three groups based on variations in composition and abundance, and revealed associations between these groups and specific hydro-geomorphic conditions (i.e., flow, depth, channel width and the presence of riparian vegetation). Our study revealed that fish diversity distributes heterogeneously along the main channel, where hydro-geomorphic patches select for distinct assemblages along riverine gradients. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1982-0224-20190043 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
dc.source.none.fl_str_mv |
Neotropical Ichthyology v.17 n.4 2019 reponame:Neotropical ichthyology (Online) instname:Sociedade Brasileira de Ictiologia (SBI) instacron:SBI |
instname_str |
Sociedade Brasileira de Ictiologia (SBI) |
instacron_str |
SBI |
institution |
SBI |
reponame_str |
Neotropical ichthyology (Online) |
collection |
Neotropical ichthyology (Online) |
repository.name.fl_str_mv |
Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI) |
repository.mail.fl_str_mv |
||neoichth@nupelia.uem.br |
_version_ |
1752122183157547008 |