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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Stylodrilus heringianus

Freshwater species. (ref. ID; 7006)

[ref. ID; 2164]

Test system

Approximately 42-days gamma scan system

Strains

From offshore Benton Harbor, Michigan and Grand Haven, Michigan.

Toxicants

Lake Michigan sediments collected from offshore Benton Harbor, Michigan and Grand Haven, Michigan (Grand Haven considered less contaminated than Benton Harbor).

Test design

Six glass microcosms (5.5x3.5x30 cm), dark. Temperature 10 degrees C.

Measurements/observations

Sediment reworking rate, mortality, dry weight.

[ref. ID; 7006]

Test system

96-hr acute lethal bioassay

Strains

Worms were sieved (0.5 mm mesh) from sediment (Lake Michigan near Waukegan, III.) collected by means of Ponar grabs or dip nets.

Toxicants

3CdSO4/8H2O, HgCl2, 2,3,4,5,6-Pentacholophenate, and black liquor.

Test design

Petri dishes (3.5 cm diameter and 1 cm depth). Loading densities <0.5 g/L. 24-hr solution replacement. 3 replicates. Dark.

Experimental condition

Temperature (1, 10, 20 degrees C), pH (6, 7, 8), salinity (0, 5 ppt).

Measurements/observations

Mortality.

Evaluations

LC50.