sh.sePublications
Change search
ReferencesLink to record
Permanent link

Direct link
Abnormal features of M. balthica (Bivalvia) in the Baltic Sea: alerting symptom of environmental changes?
Show others and affiliations
2004 (English)In: Marine Pollution Bulletin, ISSN 0025-326X, E-ISSN 1879-3363, Vol. 49, no 1-2, 17-22 p.Article in journal (Refereed) Published
Abstract [en]

Recent studies of the Baltic clam Macoma balthica (L.) from the southern Baltic (the Gulf of Gdansk) have revealed striking morphological, histological and cytogenetic features. Strong deformation of the shell, including elongation of the posterior end and the appearance of an easily visible flexure in this part, has been recorded. The population contribution of the deformed blunt shelled (“irregular”) clams ranged from 0% to 65% and tended to increase with depth. The morphologically “irregular” clams had higher accumulated tissue concentrations of trace metals (As, Ag, Cd, Pb, Cu and Zn), indicating a different metal handling ability. Adverse conditions in deeper water regions of the Gulf (e.g. hypoxia, hydrogen sulphide, elevated bioavailability of contaminants) have been suggested as inducers of the phenotypical changes (morphological deformation) in part of the population and, in parallel, of the specific physiological adaptations that result in higher metal accumulation in the “irregular” clams. Cytogenetic and histological analyses showed the presence of tumours in gill cells and digestive system of the affected clams, the prevalence of disseminated neoplasia ranging from 0% to 94% depending on the site. The disease was manifested by a modified karyotype (i.e. an abnormal number and morphology of chromosomes), a higher activity of nucleolar organizer regions (AgNORs), and tissue lesions (enlarged cells, actively proliferative with pleomorphic nuclei). Bottom sediments showed acute toxicity and have been proposed as a source of an initialising carcinogenic factor. However, none of the ecotoxicological studies provided was successful in the clear demonstration of a single (or multifactorial) agent that can account for the disseminated neoplasia.

Place, publisher, year, edition, pages
2004. Vol. 49, no 1-2, 17-22 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-8401DOI: 10.1016/j.marpolbul.2004.04.002OAI: oai:DiVA.org:sh-8401DiVA: diva2:415259
Available from: 2011-05-06 Created: 2011-05-06Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Smolarz-Gorska, Katarzyna
In the same journal
Marine Pollution Bulletin
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 67 hits
ReferencesLink to record
Permanent link

Direct link