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An assessment of the impact of chromium-amended sediment on a marine nematode assemblage using microcosm bioassays.
MedLine Citation:
PMID:  20632126     Owner:  NLM     Status:  In-Data-Review    
Microcosms were used to assess the impact of chromium on free-living marine nematodes. Nematodes were exposed to three chromium concentrations (500 ppm (dm, dry mass), 800 ppm (dm) and 1,300 ppm (dm)), and effects were examined after 4 weeks. Results showed significant differences between univariate measures of control nematodes and those from medium- and high-chromium microcosms. Most, decreased significantly with increasing level of chromium contamination. The medium-chromium treatment seems to be the minimal concentration that could has a negative effect on nematodes. Results from multivariate analyses demonstrated that responses of nematode species to chromium treatments were varied: Leptonemella aphanothecae was eliminated at all doses tested and seemed to be intolerant species to chromium; Daptonema normandicum and Sabatieria longisetosa which significantly increased at 500 ppm chromium (dm) appeared to be "opportunistic" species at this dose whereas the two Bathylaimus species (Bathylaimus capacosus and Bathylaimus tenuicaudatus) which increased at all the doses tested seemed to be "chromium resistant". As we think such "opportunistic" and "resistant" species could be used as sensitive indicators of unsafe marine food. The use of microcosms has allowed the effects of the chromium on nematodes to be assessed individually, which was not possible in the field.
Fehmi Boufahja; Amor Hedfi; Jalila Amorri; Patricia Aïssa; Hamouda Beyrem; Ezzeddine Mahmoudi
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Publication Detail:
Type:  Journal Article     Date:  2010-07-15
Journal Detail:
Title:  Biological trace element research     Volume:  142     ISSN:  1559-0720     ISO Abbreviation:  Biol Trace Elem Res     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-06-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7911509     Medline TA:  Biol Trace Elem Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  242-55     Citation Subset:  IM    
Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, Faculty of Sciences of Bizerte, 7021, Zarzouna, Tunisia,
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