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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Sociedade Brasileira de Ictiologia
2013-06-01
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Series: | Neotropical Ichthyology |
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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 |
work_keys_str_mv |
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