Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain

The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period f...

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Main Authors: Ana Cristina Petry, Fabiane Abujanra, Luiz Carlos Gomes, Horacio Ferreira Julio Jr., Angelo Antonio Agostinho
Format: Article
Language:English
Published: Sociedade Brasileira de Ictiologia 2013-06-01
Series:Neotropical Ichthyology
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413&lng=en&tlng=en
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spelling doaj-e5b33ca12808481f957682ddde2297462020-11-24T20:52:23ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02242013-06-0111241342410.1590/S1679-62252013005000008S1679-62252013000200413Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplainAna Cristina PetryFabiane AbujanraLuiz Carlos GomesHoracio Ferreira Julio Jr.Angelo Antonio AgostinhoThe effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved oxygen was the best predictor of variability of STH and SIH in years of moderate floods, whereas water transparency predicted significant amounts of STH in years of short floods. Being positively affected by dissolved oxygen reductions, STH seem to take advantages in persisting in seasonally harsh lentic habitats. The incorporation of abiotic data as well the differential tolerance of species to hypoxia would improve further investigations of the effects of interannual variations in the flood pulse on tropical fish assemblageshttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413&lng=en&tlng=enDissolved oxygenDuration of floodsLakes and riversNeotropicalWater transparency
collection DOAJ
language English
format Article
sources DOAJ
author Ana Cristina Petry
Fabiane Abujanra
Luiz Carlos Gomes
Horacio Ferreira Julio Jr.
Angelo Antonio Agostinho
spellingShingle Ana Cristina Petry
Fabiane Abujanra
Luiz Carlos Gomes
Horacio Ferreira Julio Jr.
Angelo Antonio Agostinho
Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
Neotropical Ichthyology
Dissolved oxygen
Duration of floods
Lakes and rivers
Neotropical
Water transparency
author_facet Ana Cristina Petry
Fabiane Abujanra
Luiz Carlos Gomes
Horacio Ferreira Julio Jr.
Angelo Antonio Agostinho
author_sort Ana Cristina Petry
title Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
title_short Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
title_full Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
title_fullStr Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
title_full_unstemmed Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain
title_sort effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper parana river floodplain
publisher Sociedade Brasileira de Ictiologia
series Neotropical Ichthyology
issn 1982-0224
publishDate 2013-06-01
description The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved oxygen was the best predictor of variability of STH and SIH in years of moderate floods, whereas water transparency predicted significant amounts of STH in years of short floods. Being positively affected by dissolved oxygen reductions, STH seem to take advantages in persisting in seasonally harsh lentic habitats. The incorporation of abiotic data as well the differential tolerance of species to hypoxia would improve further investigations of the effects of interannual variations in the flood pulse on tropical fish assemblages
topic Dissolved oxygen
Duration of floods
Lakes and rivers
Neotropical
Water transparency
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413&lng=en&tlng=en
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