Effects of chronic exposure to dispersed oil on selected reproductive processes in adult blue mussels (Mytilus edulis) and the consequences for the early life stages of their larvae
07-Jul-2011 12:00:00 AM
|Title:||Effects of chronic exposure to dispersed oil on selected reproductive processes in adult blue mussels (Mytilus edulis) and the consequences for the early life stages of their larvae|
Ortiz-Zarragoitia , M.
|Research group:||Marint miljø (Marine Environment)|
Abstract;Mussels (Mytilus edulis) were continuously exposed to dispersed crude oil ;(0.015–0.25 mg/l) for 7 months covering the whole gamete development cycle. ;After 1 month exposure to 0.25 mg oil/l, the level of alkali-labile phosphates ;(ALP) and the volume density of atretic oocytes in female gonads were higher ;than those in the gonads of control females, indicating that oil affected the ;level of vitellogenin-like proteins and gamete development. Spawning of mussels ;was induced after 7 months oil exposure. Parental oil exposure did not affect ;subsequent fertilization success in clean seawater but this was reduced in ;0.25 mg oil/l. Parental exposure to 0.25 mg oil/l caused both slow development ;and a higher percentage of abnormalities in D-shell larvae 2 days ;post-fertilization; reduced growth 7 days post-fertilization. These effects ;were greatly enhanced when larval stages were maintained at 0.25 mg oil/l. ;Similar studies are warranted for risk assessment prognosis.;;;;;;;;;;;;;