Document Detail

Influence of LAS on marine calanoid copepod population dynamics and potential reproduction.
MedLine Citation:
PMID:  12758005     Owner:  NLM     Status:  MEDLINE    
The toxicity of linear alkyl benzene sulfonate (LAS) to marine invertebrates is well documented under laboratory conditions using single-species tests. It is less known how LAS affects natural populations of aquatic organisms. We hypothesised that LAS was more toxic to the calanoid copepod Acartia sp. under natural conditions than Acartia tonsa under cultured conditions in the laboratory. This hypothesis was checked by a direct comparison of LAS toxicity in single-species and model (mesocosm) studies. The acute and sublethal effects of LAS on the survival and egg production of laboratory reared A. tonsa were examined by standard test, i.e. incubation with LAS without food for 24-72 h. The LC(50) and EC(50) values averaged 1.23 and 0.74 mg l(-1) for survival and egg production, respectively. These values are comparable to previous reports. The effects of LAS on a natural copepod community were also investigated under in situ conditions. A series of seven mesocosms (holding approx. 3 m(3) of seawater each) was established with two mesocosms being controls without LAS and five mesocosms with increasing concentrations of LAS ranging from 0.1 to 6.5 mg l(-1) applied as a single dose. The indigenous copepod community, dominated by Acartia sp. and Centropages sp., responded clearly to LAS concentrations above 0.1 mg l(-1). The calculated no effect value was 0.14 mg LAS l(-1) (95% CI=0.08-1.82 mg LAS l(-1)) for the entire copepod community including all development stages after 24 h exposure. The increased sensitivity under in situ conditions was probably promoted by the suboptimal growth conditions, e.g. no saturated food concentration or inadequate nutritive values of the food. The amount of food expressed as chlorophyll concentration was low (around 2 microg chl. a l(-1)) but was not affected by LAS. It appeared that the naupliar stages of Acartia and Centropages were the least affected by LAS and that new cohorts were able to develop 15 days after the dosing with LAS.
Kirsten Christoffersen; Benni W Hansen; Liselotte S Johansson; Elisabeth Krog
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aquatic toxicology (Amsterdam, Netherlands)     Volume:  63     ISSN:  0166-445X     ISO Abbreviation:  Aquat. Toxicol.     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-05-21     Completed Date:  2003-08-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8500246     Medline TA:  Aquat Toxicol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  405-16     Citation Subset:  IM    
Freshwater Biological Laboratory, University of Copenhagen, Helsingørsgade 51, Hillerød 3400, Denmark.
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MeSH Terms
Acute Toxicity Tests / methods
Alkanesulfonic Acids / toxicity*
Copepoda / physiology*
Dose-Response Relationship, Drug
Environment, Controlled
Environmental Exposure
Fertility / drug effects
Lethal Dose 50
Population Dynamics
Reproduction / drug effects*
Water Pollutants, Chemical / toxicity*
Reg. No./Substance:
0/Alkanesulfonic Acids; 0/Water Pollutants, Chemical; 0/alkylbenzyl sulfonic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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