Trace Metals In Soft Tissues Of Two Marine
Gastropod Molluscs: Monodonta Turbinata B.
And Patella Caerulea L. Collected In A Marine
Reference Ecosystem
Author(s)
M. E. Conti, M. Iacobucci, M. Mecozzi & G. Cecchetti
Abstract
Monodonta turbinata B. and Patella caerulea L. were evaluated as possible
biomonitors of trace metal contamination in marine coastal areas. These species
are marine gastropod molluscs; they are distributed in all coastal areas of the
Mediterranean sea and are easy to identify and available all year round. They
have the necessary prerequisites for use as biomonitors.
The first aim of this preliminary survey is to evaluate the concentrations of
Cd, Cr, Cu, Pb and Zn present in soft tissues of the selected species. Samples
were collected in the tidal zone (1-2 meters depth) in a possible reference
ecosystem (Linosa island, Sicily, Italy). Five coastal stations were selected
according to the species availability. The second purpose was to establish the
validity of these two gastropod species as bioaccumulators. The station number 4
(Pozzolana di Ponente) is the only site in Italy where the sea turtle Caretta
caretta, annually deposes her eggs; thus this station is of a particular ecological
relevance.
In order to test the bioaccumulation capabilities of these biomonitors seawater
samples were collected in each site to assess soluble metal concentrations and
then CFs. Seawater samples were collected appropriately in a 6-month period of
sampling in the selected stations.
Statistical multivariate analyses, PCA, were applied to test the differences
between metal concentrations in different sites and species. Results showed high
results (CFs) with respect to the concentrations in marine waters (soluble
fraction). This confirmed the suitability of these species for biomonitoring
purposes. PCA analysis showed clearly two separated patterns of
bioaccumulation (i.e. Patella and Monodonta) and no significant differences (p =
0.05) for trace metal accumulation were obtained between the studied sites.
This finding agrees with the hypothesis of this island as reference ecosystem
for intraspecific comparison within Tyrrhenian areas.
Keywords
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