On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region
Aim:To evaluate possible nycthemeral and seasonal temporal patterns in fish assemblage associated with limnological aspects and biotic factors in two reservoirs in semarid Northeastern Brazil.MethodsFish were sampled with gillnets in nycthemeral cycles throughout the dry and rainy season in two reservoirs (Paulo Sarasate/PS and Edson Queiroz/EQ). The stomach contents of the predator species were surveyed. The limnological variables were submitted to principal components analysis, while their relation to fish abundance was determined by canonical correspondence analysis. Temporal patterns in relative fish species abundance were detected with nMDS.ResultsTemperature and dissolved oxygen levels segregated the reservoirs physico-chemically. Turbidity and chlorophyll-a levels differed between seasons, and the relative abundance of species differed between the reservoirs. Predators were more abundant in PS, while detritivores were more abundant in EQ. Triportheus signatusand Plagioscion squamosissimus were the most abundant species in both reservoirs. In general, predator abundance was positively associated with high temperature and dissolved oxygen (PS>EQ) and negatively associated with turbidity. The activity patterns of P. squamosissimus could not be explained by fluctuations in environmental variables. Non-predators tended to cluster around the vectors chlorophyll-a, pH and turbidity. Predators had a more diversified diet in PS in accordance with food availability, while predators in EQ ate only fish and shrimp. Nycthemeral patterns varied for the same species depending on the reservoir. Generally, in PS predators were more active during daylight hours while non-predators were more active after dark. However, in EQ predators and non-predators displayed similar nycthemeral activity patterns. Regardless of the reservoir, predators were more abundant in the rainy season. No seasonal trend was observed for non-predators.ConclusionsLimnological differences between PS and EQ influenced temporal species abundance patterns. The species distribution was determined by predation conditions and physiological attributes.
Main Authors: | , , , , |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Associação Brasileira de Limnologia
2015
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2015000100004 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
oai:scielo:S2179-975X2015000100004 |
---|---|
record_format |
ojs |
spelling |
oai:scielo:S2179-975X20150001000042015-10-08On the relation amongst limnological factors and fish abundance in reservoirs at semiarid regionGurgel-Lourenço,Ronaldo CésarRodrigues-Filho,Carlos Alberto de SousaAngelini,RonaldoGarcez,Danielle SequeiraSánchez-Botero,Jorge Iván physical and chemical variables daily patterns diet predation fish stocking Aim:To evaluate possible nycthemeral and seasonal temporal patterns in fish assemblage associated with limnological aspects and biotic factors in two reservoirs in semarid Northeastern Brazil.MethodsFish were sampled with gillnets in nycthemeral cycles throughout the dry and rainy season in two reservoirs (Paulo Sarasate/PS and Edson Queiroz/EQ). The stomach contents of the predator species were surveyed. The limnological variables were submitted to principal components analysis, while their relation to fish abundance was determined by canonical correspondence analysis. Temporal patterns in relative fish species abundance were detected with nMDS.ResultsTemperature and dissolved oxygen levels segregated the reservoirs physico-chemically. Turbidity and chlorophyll-a levels differed between seasons, and the relative abundance of species differed between the reservoirs. Predators were more abundant in PS, while detritivores were more abundant in EQ. Triportheus signatusand Plagioscion squamosissimus were the most abundant species in both reservoirs. In general, predator abundance was positively associated with high temperature and dissolved oxygen (PS>EQ) and negatively associated with turbidity. The activity patterns of P. squamosissimus could not be explained by fluctuations in environmental variables. Non-predators tended to cluster around the vectors chlorophyll-a, pH and turbidity. Predators had a more diversified diet in PS in accordance with food availability, while predators in EQ ate only fish and shrimp. Nycthemeral patterns varied for the same species depending on the reservoir. Generally, in PS predators were more active during daylight hours while non-predators were more active after dark. However, in EQ predators and non-predators displayed similar nycthemeral activity patterns. Regardless of the reservoir, predators were more abundant in the rainy season. No seasonal trend was observed for non-predators.ConclusionsLimnological differences between PS and EQ influenced temporal species abundance patterns. The species distribution was determined by predation conditions and physiological attributes.info:eu-repo/semantics/openAccessAssociação Brasileira de LimnologiaActa Limnologica Brasiliensia v.27 n.1 20152015-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2015000100004en10.1590/S2179-975X2414 |
institution |
SCIELO |
collection |
OJS |
country |
Brasil |
countrycode |
BR |
component |
Revista |
access |
En linea |
databasecode |
rev-scielo-br |
tag |
revista |
region |
America del Sur |
libraryname |
SciELO |
language |
English |
format |
Digital |
author |
Gurgel-Lourenço,Ronaldo César Rodrigues-Filho,Carlos Alberto de Sousa Angelini,Ronaldo Garcez,Danielle Sequeira Sánchez-Botero,Jorge Iván |
spellingShingle |
Gurgel-Lourenço,Ronaldo César Rodrigues-Filho,Carlos Alberto de Sousa Angelini,Ronaldo Garcez,Danielle Sequeira Sánchez-Botero,Jorge Iván On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
author_facet |
Gurgel-Lourenço,Ronaldo César Rodrigues-Filho,Carlos Alberto de Sousa Angelini,Ronaldo Garcez,Danielle Sequeira Sánchez-Botero,Jorge Iván |
author_sort |
Gurgel-Lourenço,Ronaldo César |
title |
On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
title_short |
On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
title_full |
On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
title_fullStr |
On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
title_full_unstemmed |
On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
title_sort |
on the relation amongst limnological factors and fish abundance in reservoirs at semiarid region |
description |
Aim:To evaluate possible nycthemeral and seasonal temporal patterns in fish assemblage associated with limnological aspects and biotic factors in two reservoirs in semarid Northeastern Brazil.MethodsFish were sampled with gillnets in nycthemeral cycles throughout the dry and rainy season in two reservoirs (Paulo Sarasate/PS and Edson Queiroz/EQ). The stomach contents of the predator species were surveyed. The limnological variables were submitted to principal components analysis, while their relation to fish abundance was determined by canonical correspondence analysis. Temporal patterns in relative fish species abundance were detected with nMDS.ResultsTemperature and dissolved oxygen levels segregated the reservoirs physico-chemically. Turbidity and chlorophyll-a levels differed between seasons, and the relative abundance of species differed between the reservoirs. Predators were more abundant in PS, while detritivores were more abundant in EQ. Triportheus signatusand Plagioscion squamosissimus were the most abundant species in both reservoirs. In general, predator abundance was positively associated with high temperature and dissolved oxygen (PS>EQ) and negatively associated with turbidity. The activity patterns of P. squamosissimus could not be explained by fluctuations in environmental variables. Non-predators tended to cluster around the vectors chlorophyll-a, pH and turbidity. Predators had a more diversified diet in PS in accordance with food availability, while predators in EQ ate only fish and shrimp. Nycthemeral patterns varied for the same species depending on the reservoir. Generally, in PS predators were more active during daylight hours while non-predators were more active after dark. However, in EQ predators and non-predators displayed similar nycthemeral activity patterns. Regardless of the reservoir, predators were more abundant in the rainy season. No seasonal trend was observed for non-predators.ConclusionsLimnological differences between PS and EQ influenced temporal species abundance patterns. The species distribution was determined by predation conditions and physiological attributes. |
publisher |
Associação Brasileira de Limnologia |
publishDate |
2015 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2015000100004 |
work_keys_str_mv |
AT gurgellourencoronaldocesar ontherelationamongstlimnologicalfactorsandfishabundanceinreservoirsatsemiaridregion AT rodriguesfilhocarlosalbertodesousa ontherelationamongstlimnologicalfactorsandfishabundanceinreservoirsatsemiaridregion AT angelinironaldo ontherelationamongstlimnologicalfactorsandfishabundanceinreservoirsatsemiaridregion AT garcezdaniellesequeira ontherelationamongstlimnologicalfactorsandfishabundanceinreservoirsatsemiaridregion AT sanchezboterojorgeivan ontherelationamongstlimnologicalfactorsandfishabundanceinreservoirsatsemiaridregion |
_version_ |
1756439654356221952 |