Acute and sublethal effects of a non-ionic surfactant, Genapol OXD-080, on mosquitofish Gambusia holbrooki (Girard).

Ver registo simples
dc.contributor.authorCabral, João Alexandre
dc.contributor.authorÁvila, Sofia
dc.contributor.authorMarques, João Carlos
dc.date.accessioned2015-03-17T15:46:36Z
dc.date.available2015-03-17T15:46:36Z
dc.date.issued1999
dc.description.abstractApplication of the biodegradable non-ionic surfactant Genapol OXD-080, a fatty alcohol polyglycol ester, in rice paddies has been considered as a method to mitigate damage caused by the Louisiana red swamp crayfish, Procambarus clarkii, to rice crops. The damages are a consequence of crayfish digging activities. The acute and sublethal effects of Genapol on a non-target key species were examined to assess the potential risk of contaminating the irrigation channels following its application in the rice paddies. Mosquitofish, Gambusia holbrooki, due to its abundance in irrigation channels, and because it is a predator with an intermediate position in the food chain, was selected as the key non-target species. The LC50 value for Genapol to mosquitofish was 2.9 mg ly1 , a value 17.2 times lower than the Genapol concentration needed to decrease crayfish digging activity 50 mg ly1 .. For sublethal tests, three biological parameters were considered in laboratory experiments with mosquitofish: respira- tory metabolism, food energetic. consumption, and clutch survival. A significant decrease in the resting metabolism of mosquitofish was observed, even when Genapol exposure concentrations were very low e.g., 0.75 mg ly1 .. Thus, oxygen consumption rates of mosquitofish are strongly affected by to the presence of this surfactant in water. In contrast, mosquitofish food consumption and clutch survival seemed not to be affected by sub-lethal concentrations of Genapol. Yet, sub-lethal effect concentrations for mosquitofish are so much lower than the concentration necessary to decrease significantly crayfish activity, we conclude that there is a reasonable potential risk of damaging local mosquitofish populations if contamination of the irrigation channels with Genapol occurs.pt
dc.identifier.citationCabral J. A. et al., 1999pt
dc.identifier.otherdoi: 10.1023/A:1008975013964
dc.identifier.urihttp://hdl.handle.net/10348/4331
dc.language.isoengpt
dc.peerreviewedyespt
dc.relation.ispartofCITAB - Centro de Investigação e de Tecnologias Agro-Ambientais e Biológicaspt
dc.rightsrestricted accesspt
dc.subjectMosquitofishpt
dc.subjectGambusia holbrookipt
dc.subjectSurfactantpt
dc.subjectLC50pt
dc.subjectRespiratory metabolismpt
dc.subjectFood consumptionpt
dc.subjectClutch survivalpt
dc.titleAcute and sublethal effects of a non-ionic surfactant, Genapol OXD-080, on mosquitofish Gambusia holbrooki (Girard).pt
dc.typejournal articlept
degois.publication.firstPage245pt
degois.publication.issue4pt
degois.publication.lastPage252pt
degois.publication.locationKluwer Academic Publishers, Boston. Manufactured in the Netherlandspt
degois.publication.titleEcotoxicologypt
degois.publication.volume8pt
dspace.entity.typePublicationen
Ficheiros
Principais
A mostrar 1 - 1 de 1
Nome:
6. Cabral et al. 1999b.pdf
Tamanho:
130.19 KB
Formato:
Adobe Portable Document Format
Ver/Abrir
Coleções
DEBA - Artigo publicado em Revista Científica Indexada