Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year
Autor(a) principal: | |
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Data de Publicação: | 2003 |
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=S1679-62252003000200005 |
Resumo: | Irregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in disconnected lagoons. Significantly higher values of species richness and biomass were recorded in November than in August. Rare species had the greatest effect on observed patterns in fish assemblage ordination (DCA). Observed patterns of variation in assemblage attributes were directly correlated with factors related to hydrological connectivity, such as depth, resources (zooplankton and chlorophyll a) and nutrients (total phosphorus). |
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Neotropical ichthyology (Online) |
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|
spelling |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry yearNeotropical fishesfish assemblage structurehydrological connectivityfloodplainIrregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in disconnected lagoons. Significantly higher values of species richness and biomass were recorded in November than in August. Rare species had the greatest effect on observed patterns in fish assemblage ordination (DCA). Observed patterns of variation in assemblage attributes were directly correlated with factors related to hydrological connectivity, such as depth, resources (zooplankton and chlorophyll a) and nutrients (total phosphorus).Sociedade Brasileira de Ictiologia2003-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200005Neotropical Ichthyology v.1 n.2 2003reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/S1679-62252003000200005info:eu-repo/semantics/openAccessPetry,Ana CristinaAgostinho,Angelo AntonioGomes,Luiz Carloseng2008-01-02T00:00:00Zoai:scielo:S1679-62252003000200005Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2008-01-02T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false |
dc.title.none.fl_str_mv |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
title |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
spellingShingle |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year Petry,Ana Cristina Neotropical fishes fish assemblage structure hydrological connectivity floodplain |
title_short |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
title_full |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
title_fullStr |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
title_full_unstemmed |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
title_sort |
Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year |
author |
Petry,Ana Cristina |
author_facet |
Petry,Ana Cristina Agostinho,Angelo Antonio Gomes,Luiz Carlos |
author_role |
author |
author2 |
Agostinho,Angelo Antonio Gomes,Luiz Carlos |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Petry,Ana Cristina Agostinho,Angelo Antonio Gomes,Luiz Carlos |
dc.subject.por.fl_str_mv |
Neotropical fishes fish assemblage structure hydrological connectivity floodplain |
topic |
Neotropical fishes fish assemblage structure hydrological connectivity floodplain |
description |
Irregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in disconnected lagoons. Significantly higher values of species richness and biomass were recorded in November than in August. Rare species had the greatest effect on observed patterns in fish assemblage ordination (DCA). Observed patterns of variation in assemblage attributes were directly correlated with factors related to hydrological connectivity, such as depth, resources (zooplankton and chlorophyll a) and nutrients (total phosphorus). |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-01 |
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=S1679-62252003000200005 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1679-62252003000200005 |
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.1 n.2 2003 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_ |
1752122177763672064 |