Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)

ABSTRACT Ecotoxicological tests performed in waters with low salinities, typical of estuarine environments, are limited regarding the availability of test organisms. The amphipod Hyalella azteca, an organism protocoled for trials with freshwater sediments, presents a potential for use in saltwater t...

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Autores principales:	Destefani,Anelise, Friedrichsen,Juliana Cristina, Resgalla Jr,Charrid
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2018
Materias:	Hyalella azteca salinity sediment grain size organic matter content acclimation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000400791
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spelling	oai:scielo:S0718-560X20180004007912018-11-06Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)Destefani,AneliseFriedrichsen,Juliana CristinaResgalla Jr,Charrid Hyalella azteca salinity sediment grain size organic matter content acclimation ABSTRACT Ecotoxicological tests performed in waters with low salinities, typical of estuarine environments, are limited regarding the availability of test organisms. The amphipod Hyalella azteca, an organism protocoled for trials with freshwater sediments, presents a potential for use in saltwater tests in which the confounding factors, such as salinity and sediment grain size, should be evaluated to avoid errors in the results in relation to the sensitivity of the organism. Thus, amphipod cultivations in salinities of 0, 5, 10 and 20 were conducted, to perform tests of tolerance to salinity, and sensitivity to a reference toxicant. The tolerance of the species to different sediment grain sizes and organic matter contents was evaluated in tests with reconstituted sediments in five different compositions, varying the content of organic matter (5 to 20%), clay and sand (0 to 95%). The results of the cultivations showed that animals maintained present the best reproduction and survival rates at salinity 5, and a tolerance limit under chronic conditions, at salinity above 10. The salinity can be considered a confounding factor since the tests carried out with the reference toxicant showed the higher resistance of the species under conditions of higher salinities. The species present tolerance to different sediment grain sizes and organic matter contents; therefore, this factor does not interfere in the survival of H. azteca during the ecotoxicological tests.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.46 n.4 20182018-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000400791en10.3856/vol46-issue4-fulltext-16
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Hyalella azteca salinity sediment grain size organic matter content acclimation
spellingShingle	Hyalella azteca salinity sediment grain size organic matter content acclimation Destefani,Anelise Friedrichsen,Juliana Cristina Resgalla Jr,Charrid Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
description	ABSTRACT Ecotoxicological tests performed in waters with low salinities, typical of estuarine environments, are limited regarding the availability of test organisms. The amphipod Hyalella azteca, an organism protocoled for trials with freshwater sediments, presents a potential for use in saltwater tests in which the confounding factors, such as salinity and sediment grain size, should be evaluated to avoid errors in the results in relation to the sensitivity of the organism. Thus, amphipod cultivations in salinities of 0, 5, 10 and 20 were conducted, to perform tests of tolerance to salinity, and sensitivity to a reference toxicant. The tolerance of the species to different sediment grain sizes and organic matter contents was evaluated in tests with reconstituted sediments in five different compositions, varying the content of organic matter (5 to 20%), clay and sand (0 to 95%). The results of the cultivations showed that animals maintained present the best reproduction and survival rates at salinity 5, and a tolerance limit under chronic conditions, at salinity above 10. The salinity can be considered a confounding factor since the tests carried out with the reference toxicant showed the higher resistance of the species under conditions of higher salinities. The species present tolerance to different sediment grain sizes and organic matter contents; therefore, this factor does not interfere in the survival of H. azteca during the ecotoxicological tests.
author	Destefani,Anelise Friedrichsen,Juliana Cristina Resgalla Jr,Charrid
author_facet	Destefani,Anelise Friedrichsen,Juliana Cristina Resgalla Jr,Charrid
author_sort	Destefani,Anelise
title	Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
title_short	Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
title_full	Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
title_fullStr	Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
title_full_unstemmed	Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)
title_sort	evaluation of potential confounding factors in sediment toxicity tests with hyalella azteca (saussure, 1858)
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000400791
work_keys_str_mv	AT destefanianelise evaluationofpotentialconfoundingfactorsinsedimenttoxicitytestswithhyalellaaztecasaussure1858 AT friedrichsenjulianacristina evaluationofpotentialconfoundingfactorsinsedimenttoxicitytestswithhyalellaaztecasaussure1858 AT resgallajrcharrid evaluationofpotentialconfoundingfactorsinsedimenttoxicitytestswithhyalellaaztecasaussure1858
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Evaluation of potential confounding factors in sediment toxicity tests with Hyalella azteca (Saussure, 1858)

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