title: Comparison of four chronic toxicity tests using algae, bacteria, and invertebrates assessed with sixteen chemicals.
abstract: The performances of four chronic toxicity tests, comprising the Daphnia magna 21-day (d) (crustacean), Brachionus calyciflorus 2-d (rotifer), Pseudokirchneriella subcapitata 72-h (green algae), and the Microtox chronic 22-h (bacteria) tests, were compared. Sixteen chemicals with toxicity covering 6 orders of magnitude were studied. Very high correlations were found between the NOEC/EC(10) Pseudokirchneriella 72-h, NOEC/EC(10) Brachionus 2-d, and the NOEC Daphnia 21-d tests. The toxicological response of rotifers and microalgae were within the same order of magnitude as the response of Daphnia in 80% of cases (13/16 chemicals). The Microtox chronic test also anticipated the overall results of the Daphnia 21-d test, but the prediction was rather imprecise, compared with microalgae and rotifers. The test measuring the algal growth inhibition of P. subcapitata after 72h was the most sensitive bioassay. Toxicity on microalgae after 72h could be estimated after 5h by measuring either the direct fluorescence of either photosynthetic pigments or fluorescein diacetate in 56 and 43% of cases, respectively. The median value of the ratio between EC(10) and EC(50) was 3.75, 2, and 1.5 with the algae, the rotifers, and the bacteria, respectively.
authors.affiliation: Centre des Sciences de l' Environnement, UFR Sciences, EBSE rue Delestraint, Metz, 57070, France.
authors.forename: P
authors.initials: P
authors.lastname: Radix
authors.forename: M
authors.initials: M
authors.lastname: Léonard
authors.forename: C
authors.initials: C
authors.lastname: Papantoniou
authors.forename: G
authors.initials: G
authors.lastname: Roman
authors.forename: E
authors.initials: E
authors.lastname: Saouter
authors.forename: S
authors.initials: S
authors.lastname: Gallotti-Schmitt
authors.forename: H
authors.initials: H
authors.lastname: Thiébaud
authors.forename: P
authors.initials: P
authors.lastname: Vasseur
mesh_terms: D000465:Algorithms; D000818:Animals; D001419:Bacteria / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D000460:Chlorophyta / Q000187:drug effects*; D003621:Daphnia / Q000502:physiology; D007448:Invertebrates / Q000502:physiology*; D007928:Lethal Dose 50; D008163:Luminescent Measurements; D012403:Rotifera; D013045:Species Specificity; D018675:Toxicity Tests; D014733:Vibrio / Q000502:physiology