Linked Life Data

15917095

Source:http://linkedlifedata.com/resource/pubmed/id/15917095

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2005-5-26
pubmed:abstractText
Microcosm and mesocosm studies evidence that pyrethroid insecticides may have a severe effect on zooplankton populations. The effect may cascade to phytoplankton communities and thus worsen the impact of eutrophication and algal blooms. In natural freshwater systems, pyrethroids are usually only detectable during the first 24 h after application to adjacent areas, a period too short for mesocosm and microcosm studies to reveal potential effects. In this study we compare the effects of environmentally realistic concentrations of the pyrethroid cypermethrin on: (i) the swimming ability of Daphnia magna; (ii) the feeding efficiency, measured as the content of chlorophyll pigments in the gut; and (iii) the total body carbohydrate content. The latter two were measured using a newly developed high performance planar chromatography (HPPC) system. Sublethal effects on the gut content of chlorophyll pigments, carbohydrate substances and the swimming ability of D. magna were observed at nominal concentrations between 0.05 and 0.6 microg cypermethrinL(-1), which lies within the concentration range occurring in freshwater systems after pesticide application. In addition, the content of chlorophyll pigments in the gut was significantly reduced (>50%) after only 6 h of exposure to 0.1 microg cypermethrinL(-1). Most of the D. magna had recovered 3 days after exposure doses lower than 0.2 microg cypermethrinL(-1). We conclude that HPPC analysis of the gut content of chlorophyll pigments was the most sensitive endpoint of our study due to its capacity to detect significant reductions in feeding within hours of exposure to environmentally realistic concentrations of cypermethrin.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0166-445X
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
73
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
210-20
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
A comparison of feeding efficiency and swimming ability of Daphnia magna exposed to cypermethrin.
pubmed:affiliation
Department of Freshwater Ecology, National Environmental Research Institute, Vejlsøvej 25, P.O. Box 314, DK-8600 Silkeborg, Denmark.
pubmed:publicationType
Journal Article, Comparative Study