TY - JOUR
T1 - The effect of bioturbation by Lumbriculus variegatus on transport and distribution of lead in a freshwater microcosm
AU - Blankson, Emmanuel R.
AU - Klerks, Paul L.
N1 - Publisher Copyright:
© 2016 SETAC.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - The present study investigated the effect of bioturbation by the oligochaete worm Lumbriculus variegatus on the transport and environmental distribution of lead (Pb). Experiments used L. variegatus at densities of 0ind./m2, 2093ind./m2, and 8372ind./m2, in freshwater microcosms with Pb-spiked sediment. At the end of the 14-d experiment, Pb levels in the water column, tissues of L. variegatus, and sediment were determined, and bioturbation was quantified using luminophores. The bioturbation by L. variegatus increased Pb transport from the sediment to the water column. However, it did not significantly affect Pb bioaccumulation by L. variegatus or Pb levels in the sediment. The biodiffusion coefficient (Db) was positively related to worm density, but did not differ between Pb-spiked sediment and uncontaminated sediment. The latter finding suggests that Pb at the 100μg/g concentration used in the present study did not affect L. variegatus bioturbation. The present study shows that bioturbation can enhance Pb transfer across the sediment-water interface and thus enhance Pb availability to organisms in the water column. Environ Toxicol Chem 2016;35:1123-1129.
AB - The present study investigated the effect of bioturbation by the oligochaete worm Lumbriculus variegatus on the transport and environmental distribution of lead (Pb). Experiments used L. variegatus at densities of 0ind./m2, 2093ind./m2, and 8372ind./m2, in freshwater microcosms with Pb-spiked sediment. At the end of the 14-d experiment, Pb levels in the water column, tissues of L. variegatus, and sediment were determined, and bioturbation was quantified using luminophores. The bioturbation by L. variegatus increased Pb transport from the sediment to the water column. However, it did not significantly affect Pb bioaccumulation by L. variegatus or Pb levels in the sediment. The biodiffusion coefficient (Db) was positively related to worm density, but did not differ between Pb-spiked sediment and uncontaminated sediment. The latter finding suggests that Pb at the 100μg/g concentration used in the present study did not affect L. variegatus bioturbation. The present study shows that bioturbation can enhance Pb transfer across the sediment-water interface and thus enhance Pb availability to organisms in the water column. Environ Toxicol Chem 2016;35:1123-1129.
KW - Bioturbation
KW - Lead
KW - Lumbriculus variegatus
KW - Transport and distribution
UR - http://www.scopus.com/inward/record.url?scp=84969326979&partnerID=8YFLogxK
U2 - 10.1002/etc.3248
DO - 10.1002/etc.3248
M3 - Article
C2 - 26378992
AN - SCOPUS:84969326979
SN - 0730-7268
VL - 35
SP - 1123
EP - 1129
JO - Environmental Toxicology and Chemistry
JF - Environmental Toxicology and Chemistry
IS - 5
ER -