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  • Title: Disruption of circulatory and respiratory activity in shore crabs (Carcinus maenas (L)) exposed to heavy metal pollution.
    Author: Depledge MH.
    Journal: Comp Biochem Physiol C Comp Pharmacol Toxicol; 1984; 78(2):445-59. PubMed ID: 6149095.
    Abstract:
    Cardiac and respiratory activity of the shore crab, Carcinus maenas (L.), were disrupted following exposure to heavy metal ions. Exposure to 3 mg l-1 copper ions induced continuous, uninterrupted heart beat in quiescent, undisturbed crabs. Copper ions (10 mg l-1) suppressed cardiac activity and oxygen consumption within 2 hr. Alternating periods of bradycardia and tachycardia were observed together with marked changes in impedance cardiograph trace height. Similar, but more pronounced changes were seen following exposure to 1 mg l-1 mercury ions. Median perfusion index was 100 ml blood ml O2(-1) (range 58-114 ml blood ml O2(-1)) prior to pollution, but increased to peak values within the range 90-220 ml O2(-1) following exposure to copper or mercury. The effects of exposure to copper were transient and largely reversible. Exposure to mercury resulted in 100% mortality 24-48 hr after initial contamination. Death was apparently associated with loss of the osmoregulatory ability of these crabs.
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