From 1996 to 2002, Fe, Mn, Cu, Pb and Cd distribution in six green macroalgae
species from the Bulgarian Black Sea coast were determined by Strezov and
Nonova (2005a). For all algae, average heavy metal concentrations were 650 μg/
g for Fe, 184 μg/g for Mn, 5.6 μg/g for Cu, 3.3 μg/g for Pb and 1.1 μg/g for
Cd. These data show that heavy metal contents in different species demonstrate
various degree of metal accumulation. The obtained higher values in the northern
part of the studied zone can be attributed to the discharge influence of the big rivers
entering the Black sea, such as Danube, Dnyeper, Dnyester, and local pollutant
emissions, as well. The obtained data also show that there is no strong contamination in green macroalgae with heavy and toxic metals along the whole Bulgarian
Black sea coast.
Metal contamination in the Black sea alga species (green and red) was studied
from 1992 to 2003, using radionuclide approach (Strezov and Nonova 2005b). It
was found that radionuclide and metal concentrations depend on the macrophyte
nature and all data show the lack of strong pollution along the Bulgarian Black sea
coast.
18.2.4.5 Data Comparison Between Neighboring Seas
The comparison of the data (Tables 18.6, 18.7 and 18.8) for radioecological status
of the Black sea marine ecosystems and the Mediterranean marine ecosystems
concerning the radionuclide and trace metal content indicated no strong anthropogenic pollution along the Bulgarian shore as the Mediterranean data are higher.
When comparing the accumulation of HM in one and the same algae the
corresponding data for Black sea algae are lower than those from the Marmara
Sea or the Mediterranean.
Aquatic organisms, especially macroalgae, are widely used as bioindicators for
the study of marine contamination by radionuclides and heavy metals. Some
species tolerate high levels of pollutants and can successfully be used to obtain
reliable information of marine ecological status. In order to evaluate the ecological
status of coastal habitat and provide valuable data for estimation of contamination
with radionuclides in Bulgarian Black sea, a monitoring program was started and
performed along the coast. Eleven macroalgae species were monitored by
collecting samples from 20 reference locations during the 1996–2005 period.
In this way the accumulation of hazardous contaminants was traced over a long
period of time and tendencies for the behaviour of those elements were evaluated.
The same comparison was made for radionuclides (Table 18.8) in the studied algae
species and Black Sea Cs content was found to be similar to the other basins while
natural nuclides were slightly higher in the Black sea.
328
A. Strezov
species from the Bulgarian Black Sea coast were determined by Strezov and
Nonova (2005a). For all algae, average heavy metal concentrations were 650 μg/
g for Fe, 184 μg/g for Mn, 5.6 μg/g for Cu, 3.3 μg/g for Pb and 1.1 μg/g for
Cd. These data show that heavy metal contents in different species demonstrate
various degree of metal accumulation. The obtained higher values in the northern
part of the studied zone can be attributed to the discharge influence of the big rivers
entering the Black sea, such as Danube, Dnyeper, Dnyester, and local pollutant
emissions, as well. The obtained data also show that there is no strong contamination in green macroalgae with heavy and toxic metals along the whole Bulgarian
Black sea coast.
Metal contamination in the Black sea alga species (green and red) was studied
from 1992 to 2003, using radionuclide approach (Strezov and Nonova 2005b). It
was found that radionuclide and metal concentrations depend on the macrophyte
nature and all data show the lack of strong pollution along the Bulgarian Black sea
coast.
18.2.4.5 Data Comparison Between Neighboring Seas
The comparison of the data (Tables 18.6, 18.7 and 18.8) for radioecological status
of the Black sea marine ecosystems and the Mediterranean marine ecosystems
concerning the radionuclide and trace metal content indicated no strong anthropogenic pollution along the Bulgarian shore as the Mediterranean data are higher.
When comparing the accumulation of HM in one and the same algae the
corresponding data for Black sea algae are lower than those from the Marmara
Sea or the Mediterranean.
Aquatic organisms, especially macroalgae, are widely used as bioindicators for
the study of marine contamination by radionuclides and heavy metals. Some
species tolerate high levels of pollutants and can successfully be used to obtain
reliable information of marine ecological status. In order to evaluate the ecological
status of coastal habitat and provide valuable data for estimation of contamination
with radionuclides in Bulgarian Black sea, a monitoring program was started and
performed along the coast. Eleven macroalgae species were monitored by
collecting samples from 20 reference locations during the 1996–2005 period.
In this way the accumulation of hazardous contaminants was traced over a long
period of time and tendencies for the behaviour of those elements were evaluated.
The same comparison was made for radionuclides (Table 18.8) in the studied algae
species and Black Sea Cs content was found to be similar to the other basins while
natural nuclides were slightly higher in the Black sea.
328
A. Strezov