Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil)
Abstract This study evaluated changes in the community of rotifers and microcrustaceans associated with the construction of a large and dendritic reservoir in Iguaçu River (Brazil), as the last reservoir of a sequence of five cascading systems. Differences were clear between pre-filling and post-fil...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Instituto Internacional de Ecologia
2016
|
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200279 |
id |
ftjscielo:oai:scielo:S1519-69842016000200279 |
---|---|
record_format |
openpolar |
spelling |
ftjscielo:oai:scielo:S1519-69842016000200279 2023-05-15T18:49:44+02:00 Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) Serafim-Júnior,M. Lansac-Tôha,F. A. Lopes,R. M. Perbiche-Neves,G. 2016-06-01 text/html http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200279 en eng Instituto Internacional de Ecologia Brazilian Journal of Biology v.76 n.2 2016 Rotifera Cladocera Copepoda Iguaçu River journal article 2016 ftjscielo 2016-07-03T11:47:31Z Abstract This study evaluated changes in the community of rotifers and microcrustaceans associated with the construction of a large and dendritic reservoir in Iguaçu River (Brazil), as the last reservoir of a sequence of five cascading systems. Differences were clear between pre-filling and post-filling phases for organisms and some of environmental variables. In the pre-filling phase, the community was more homogeneous along the downstream river gradient, and spatial compartmentalization in the new reservoir was common during the post-filling phase. From 140 identified taxa, 10 species occurred exclusively in the pre-filling phase and 32 in the post-filling phase. After completion of the fifth reservoir filling-up, opportunistic, pioneer and fast-developing species quickly dominated, and downstream of the fourth reservoir the pre-filling decreasing gradient of richness, diversity and evenness disappeared. Richness of rotifers and cladocerans, cladocerans diversity, and evenness of rotifers, cladocerans and copepods were generally higher in the post-filling phase. A non-metric multidimensional analysis based on a presence/absence matrix depicted a homogeneous and dense group of species associated to the pre-filling phase and a second, dispersed group related to the post-filling phase. Spearman correlations pointed out significant positive effects of transparency on rotifer species richness in the post-filling phase, and negative effects on the microcrustacean richness in the pre-filling phase. Dam construction caused disruption of the downstream lotic gradient along the series of dams, leading to the development of distinct species in lentic spatial compartments. Article in Journal/Newspaper Copepods Rotifer SciELO Brazil (Scientific Electronic Library Online) |
institution |
Open Polar |
collection |
SciELO Brazil (Scientific Electronic Library Online) |
op_collection_id |
ftjscielo |
language |
English |
topic |
Rotifera Cladocera Copepoda Iguaçu River |
spellingShingle |
Rotifera Cladocera Copepoda Iguaçu River Serafim-Júnior,M. Lansac-Tôha,F. A. Lopes,R. M. Perbiche-Neves,G. Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
topic_facet |
Rotifera Cladocera Copepoda Iguaçu River |
description |
Abstract This study evaluated changes in the community of rotifers and microcrustaceans associated with the construction of a large and dendritic reservoir in Iguaçu River (Brazil), as the last reservoir of a sequence of five cascading systems. Differences were clear between pre-filling and post-filling phases for organisms and some of environmental variables. In the pre-filling phase, the community was more homogeneous along the downstream river gradient, and spatial compartmentalization in the new reservoir was common during the post-filling phase. From 140 identified taxa, 10 species occurred exclusively in the pre-filling phase and 32 in the post-filling phase. After completion of the fifth reservoir filling-up, opportunistic, pioneer and fast-developing species quickly dominated, and downstream of the fourth reservoir the pre-filling decreasing gradient of richness, diversity and evenness disappeared. Richness of rotifers and cladocerans, cladocerans diversity, and evenness of rotifers, cladocerans and copepods were generally higher in the post-filling phase. A non-metric multidimensional analysis based on a presence/absence matrix depicted a homogeneous and dense group of species associated to the pre-filling phase and a second, dispersed group related to the post-filling phase. Spearman correlations pointed out significant positive effects of transparency on rotifer species richness in the post-filling phase, and negative effects on the microcrustacean richness in the pre-filling phase. Dam construction caused disruption of the downstream lotic gradient along the series of dams, leading to the development of distinct species in lentic spatial compartments. |
format |
Article in Journal/Newspaper |
author |
Serafim-Júnior,M. Lansac-Tôha,F. A. Lopes,R. M. Perbiche-Neves,G. |
author_facet |
Serafim-Júnior,M. Lansac-Tôha,F. A. Lopes,R. M. Perbiche-Neves,G. |
author_sort |
Serafim-Júnior,M. |
title |
Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
title_short |
Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
title_full |
Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
title_fullStr |
Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
title_full_unstemmed |
Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil) |
title_sort |
continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (iguaçu river, brazil) |
publisher |
Instituto Internacional de Ecologia |
publishDate |
2016 |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200279 |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_source |
Brazilian Journal of Biology v.76 n.2 2016 |
_version_ |
1766243333290590208 |