Pf. Delisle et Mh. Roberts, THE EFFECT OF SALINITY ON CADMIUM TOXICITY IN THE ESTUARINE MYSID MYSIDOPSIS-BAHIA - ROLES OF OSMOREGULATION AND CALCIUM, Marine environmental research, 37(1), 1994, pp. 47-62
Calcium exerted a sparing effect on Cd2+ toxicity in the bay mysid, My
sidopsis bahia, although the effect was not as pronounced as effects t
hat were due to Cd2+-salinity interactions. Molt rate, expressed as nu
mber of exuviae recovered per mysid day, was significantly increased b
y Cd2+-salinity interaction. Partial correlations of the number of dea
d mysids with the number of molt casts recovered, when adjusted for th
e independent effect of salinity on molt rate, were significant for mo
st periods, suggesting that the observed increase in apparent molt rat
e may actually reflect enhanced sensitivity of post-molt animals to Cd
2+. A slight, but statistically insignificant change in serum osmolali
ty was observed after 24 h exposure to 3-62 mug/liter Cd2+ at the low
test salinity of 12 parts per thousand in the first osmoregulation exp
eriment. No effects on hemolymph osmoregulation were observed in the s
econd experiment following exposure up to 48 h to similar Cd2+ levels
at 12-30 parts per thousand salinity.