ILPLA   05424
INSTITUTO DE LIMNOLOGIA "DR. RAUL A. RINGUELET"
Unidad Ejecutora - UE
artículos
Título:
An in situ test toexploretheresponsesof Scenedesmusacutus and Lepocinclis
Autor/es:
BAUER, D.E.; COFORTI, V.; RUIZ, L.; GĂ“MEZ N.
Revista:
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2011
ISSN:
0147-6513
Resumen:
This bioassaywasdesignedwiththeaimofexploringtheresponsesoftwowildplanktonicmicroalgae exposed in situ (72 h)asindicatorsofthechangesinwaterquality.Monoculturesofbothstrainswithin dialysismembranebagswereplacedattwositesinasmalllowlandstream.Site1islocatedata suburbanareawithlowhorticulturalactivityandSite2isimpactedbytoxicindustrialdischargesand urban landuse. There wasadecreaseinpopulationgrowthofbothspeciesatSite2comparedwithSite1.The comparisonofthealgaeexposed in situ with thenormalspecimensculturedatthelaboratoryindicated a significantincreaseinthecellularvolumeforbothspeciesatbothsites.Abnormalshapewasrecorded at bothsites,thepercentagebeingsignificantlygreaterfor Scenedesmus acutus at Site2.Significant changesinpyrenoidssizewereobservedin S. acutus and inthepercentageoffragmentednucleiin Lepocinclis acus. Alsointhelatterabnormalparamylongrainswereobserved.Theseresponseswere accentuatedatSite2. This bioassaywassensitive,shortterm,lowcost,andthereforeisasuitabletooltocontributewith the monitoringandecologicalriskassessmentoflowlandstreams in situ (72 h)asindicatorsofthechangesinwaterquality.Monoculturesofbothstrainswithin dialysismembranebagswereplacedattwositesinasmalllowlandstream.Site1islocatedata suburbanareawithlowhorticulturalactivityandSite2isimpactedbytoxicindustrialdischargesand urban landuse. There wasadecreaseinpopulationgrowthofbothspeciesatSite2comparedwithSite1.The comparisonofthealgaeexposed in situ with thenormalspecimensculturedatthelaboratoryindicated a significantincreaseinthecellularvolumeforbothspeciesatbothsites.Abnormalshapewasrecorded at bothsites,thepercentagebeingsignificantlygreaterfor Scenedesmus acutus at Site2.Significant changesinpyrenoidssizewereobservedin S. acutus and inthepercentageoffragmentednucleiin Lepocinclis acus. Alsointhelatterabnormalparamylongrainswereobserved.Theseresponseswere accentuatedatSite2. This bioassaywassensitive,shortterm,lowcost,andthereforeisasuitabletooltocontributewith the monitoringandecologicalriskassessmentoflowlandstreams