Banta, G. T. Roskilde University, banta@ruc.dk
Timmerman, K. . Roskilde University, karen@ruc.dk
Rasmussen, A. D. Roskilde University, adr@ruc.dk
Andersen, O. . Roskilde University, andersen@ruc.dk

 
POLLUTANT EFFECTS ON BIOTURBATION - AN ADDED WRINKLE IN INTERACTIONS BETWEEN GEOCHEMISTRY AND THE BENTHOS
 
We have recently begun investigating the effects of oil pollution on the lugworm, Arenicola marina, and the effects of lugworm bioturbation on oil compound fate in sediments using authentic samples collected from oil spills and selected model compounds. Changes in bioturbation activities are among the first effects of oil pollution on lugworms we observed. Results from a preliminary experiment using an authentic oil sample uniformly mixed into sandy sediments at concentrations of 0-800 ppm indicated that lugworm bioturbation, both feeding activity and irrigation, was reduced already at the lowest oil concentrations (100 ppm). In contrast, results from a similar experiment using pyrene, a toxic oil compound (0-1000 ppb), showed different effects on irrigation and particle mixing. At low concentrations (10 ppb), lugworms increased their irrigation, while at higher pyrene concentrations (1000 ppb) they slowed their irrigation. Feeding rates by A. marina fell with increasing pyrene concentration over all concentrations. Oil pollution in these experiments lead to changes in irrigation and particle mixing activities and, in some cases, changes in the balance between the different components of bioturbation. The implications of such effects of pollutants on bioturbation will be discussed within the session theme of geochemistry and the benthos.
 
Day: Thursday, Feb. 4
Time: 08:30 - 08:45am
Location: Hilton of Santa Fe
 
Code: SS30FR0830S