Effect of temperature and season on reproduction, neutral red retention and metallothionein responses of earthworms exposed to metals in field soils.
This study investigated the short-term survival, reproduction and physiological (lysosomal membrane stability, metallothionein transcript copy number, body tissue metal concentrations) responses of Lumbricus rubellus exposed to metal contaminated field soils under different laboratory temperatures (10, 15 and 20 degrees C) and physiological responses of earthworms collected from the field in three different seasons (spring, autumn, winter). In the laboratory, metal contaminated soils had significant effects on reproduction (p<0.001), metallothionein-2 (MT-2) expression (p=0.033) and earthworm As (p=0.003), Cd (p=0.001), Pb (p<0.001) and Zn (p<0.001) concentration, but not lysosomal membrane stability and tissue Hg and Cu. No effect of temperature was found for any parameter. Principal component analysis of extractable and tissue metal concentrations indicated PC1 as a measure of metal stress. Both cocoon production (r=-0.75) and MT-2 induction (r=0.41) were correlated with PC1. A correlation was also found between cocoon production and MT-2 expression (r=-0.41). Neutral red retention and MT-2 measurements in worms collected from the field sites in three seasons confirmed the absence of a temperature effect on these responses.
Svendsen
Claus
C
Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, Cambridgeshire PE28 2LS, UK. csv@ceh.ac.uk
Hankard
Peter K
PK
Lister
Lindsay J
LJ
Fishwick
Samantha K
SK
Jonker
Martijs J
MJ
Spurgeon
David J
DJ
D000818:Animals; D015415:Biomarkers / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution / Q000009:adverse effects*; D007425:Intracellular Membranes / Q000378:metabolism; D008247:Lysosomes / Q000378:metabolism; D008668:Metallothionein / Q000032:analysis / Q000378:metabolism; D008670:Metals / Q000633:toxicity*; D009499:Neutral Red / Q000032:analysis / Q000378:metabolism; D009835:Oligochaeta / Q000502:physiology*; D025341:Principal Component Analysis; D012098:Reproduction; D012621:Seasons; D012989:Soil Pollutants / Q000633:toxicity*; D013696:Temperature
D015415:Biomarkers; D008670:Metals; D012989:Soil Pollutants; D009499:Neutral Red; D008668:Metallothionein