Istituto di Scienze Marine     
Moschino V., Halldorsson H., Da Ros L. Lysosomal responses to intertidal exposure in Mytilus edulis from Icelandic coast. In: Comparative Biochemistry and Physiology A-Molecular & Integrative Physiology. Abstract, vol. 157 (1) pp. S18 - S18. Elsevier, 2010.
Lysosomal alterationsmeasured in bivalve digestive cells are general stress biomarkers which, although widely used to detect consequences of pollutant exposure on organism well-being, may reveal negative effects of natural environmental factors such as temperature, food availability and tides. It is also known that tidal fluctuations are a relevant source of variability for intertidal individualswhich can exhibit differences in metabolic and digestive processes compared to subtidal organisms. The aim of the present study was to investigate the possible effects of intertidal exposure on lysosomes of Mytilus edulis from the south-west coast of Iceland.Mussels froma clean sitewere transplanted in the intertidal and subtidal zones at the contaminated site of Reykjavik and at the reference site of Hvalfjordur, and then sampled after 3, 6 and 8 weeks. Lipofuscin and neutral lipid accumulation, lysosomal membrane stability and lysosomal structural changes were histochemically evaluated. In general, lysosomal parameters, except for neutral lipids which were absent in most individuals, showed slight differences comparing intertidal and subtidal samples fromeach studied site after 3 and 6 weeks; higher differences were observed after 8 weeks, particularly at Reykjavik.Moreover, a decrease in thewell-being ofmusselswas apparent with the extent of the transplantationperiod. Lastly, organisms from Reykjavik generally showed larger and most abundant lysosomes, as well as lower membrane stability than those from Hvalfjordur.
DOI: 10.1016/j.cbpa.2010.06.048
Subject Lysosomal responses Mytilus edulis Icelandic coast

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