Different degrees of tolerance to hydrogen sulphide in populations of Macoma balthica (Bivalvia, Tellinidae)

A Jahn, H Theede
1997 Marine Ecology Progress Series  
Populations of the Baltic clam Macoma balthica show different degrees of sulphide tolerance in relation to s u l p h~d e contamination of their habitats. Specimens from sulphidic habitats such a s the Gulf of G d k k (Baltic Proper) and shallo~v waters near the island of Hiddensee (Southern Baltic Sea) have higher survival capaclt~es during sulphide exposure than those from low sulphide contaminated environments such as K~e l Bight (Western Baltic Sea) and the Wadden Sea near Dorum-Neufeld
more » ... Dorum-Neufeld (Weser estuary, North Sea). The tolerant clams are better able to protect cytochrome c oxidase against sulphide toxification. It can b e assumed that this protection is due to slower sulphide diffus~on Into the tissues Sulphide-tolerant specimens from h~g h l y sulphidic habitats have apparent sulphide d~ffusion coefflc~ents which al-e roughly half those of sulphide-sensitive specimens from low sulphidic stations. Higher s u l p h~d e influx into the sensitive clams will negatively affect t h e~r metabolism, combined with longer inhibition of cytochrome c oxidase, resulting in higher mortality.
doi:10.3354/meps154185 fatcat:tnvas7jjkvbxjirhyti3wqrgny