The results showed that the
238 U and
210 Po concentrations in anchovy were
within the ranges of 38–101 Bq/kg and 94–112 Bq/kg dry weight, respectively.
These results confirm that the dominant contribution to radioactive contamination
in fish comes from natural radionuclides, and the contribution of anthropogenic
137
Cs (from atmospheric nuclear-weapons testing and the Chernobyl accident) is
negligible.
Biokinetics of
241 Am,
110m Ag and
137 Cs were also investigated in mussel,
limpet, sea snail and macro-algae species in the Black Sea water under laboratory
conditions. In addition,
137 Cs in mussel and macroalgae species was investigated
under contaminated Black Sea conditions after the Chernobyl accident. The biological halflives of the
137 Cs in mussel and macro-algae were found to be 63 days
and 19 to 29 months, respectively (Tables 18.3 and 18.4).
18.2.4 Radionuclide Accumulation in Sediments, Algae
and Biota in Bulgarian Black Sea Marine Ecosystems
The implementation of advanced methods and technology in the field of marine
ecosystems studies is important to assess the impact of pollutants on marine
ecosystems and biodiversity and biota interactions, including reliable study of
radionuclide and heavy metal content in soils, sediments and algae. Creation of
data bases for long term environmental management of pollution; evaluation of
ecological impact of human activities and management of sustainable environment
– coastal zone and continental shelf, including assessment and forecasting techniques, is needed to understand the impacts of various activities on ecosystems, to
contribute to protect the ecosystems from pollution and to develop long-term
models for management of the coastal zone.
Improved knowledge of marine processes, ecosystems and interactions will
facilitate the basis of new ecological status, the sustainable use of the marine
environment and resources, while fully respecting ecosystem integrity and functioning, and to promote the development of new, integrated management concepts.
That is why the determining of variations of ecosystem functioning; concepts for
a safe and environmentally responsible use of the seafloor and sub-seafloor
resources; management models of transport pathways and impacts of pollutants,
key elements and nutrients in marine environments is the main task of modern
marine radioecology.
Another target is to develop a predictive capability for variations in ecosystem
functioning and structure for better assessment of naturally occurring mechanisms
of ecosystem behaviour. Research activities will address the effects of environmental factors and interactions at sea boundaries and interfaces in relation to
ecosystem functioning and alteration, distinguish natural from anthropogenic variability, assess the role of extreme environments and their communities. The
308
A. Strezov
238 U and
210 Po concentrations in anchovy were
within the ranges of 38–101 Bq/kg and 94–112 Bq/kg dry weight, respectively.
These results confirm that the dominant contribution to radioactive contamination
in fish comes from natural radionuclides, and the contribution of anthropogenic
137
Cs (from atmospheric nuclear-weapons testing and the Chernobyl accident) is
negligible.
Biokinetics of
241 Am,
110m Ag and
137 Cs were also investigated in mussel,
limpet, sea snail and macro-algae species in the Black Sea water under laboratory
conditions. In addition,
137 Cs in mussel and macroalgae species was investigated
under contaminated Black Sea conditions after the Chernobyl accident. The biological halflives of the
137 Cs in mussel and macro-algae were found to be 63 days
and 19 to 29 months, respectively (Tables 18.3 and 18.4).
18.2.4 Radionuclide Accumulation in Sediments, Algae
and Biota in Bulgarian Black Sea Marine Ecosystems
The implementation of advanced methods and technology in the field of marine
ecosystems studies is important to assess the impact of pollutants on marine
ecosystems and biodiversity and biota interactions, including reliable study of
radionuclide and heavy metal content in soils, sediments and algae. Creation of
data bases for long term environmental management of pollution; evaluation of
ecological impact of human activities and management of sustainable environment
– coastal zone and continental shelf, including assessment and forecasting techniques, is needed to understand the impacts of various activities on ecosystems, to
contribute to protect the ecosystems from pollution and to develop long-term
models for management of the coastal zone.
Improved knowledge of marine processes, ecosystems and interactions will
facilitate the basis of new ecological status, the sustainable use of the marine
environment and resources, while fully respecting ecosystem integrity and functioning, and to promote the development of new, integrated management concepts.
That is why the determining of variations of ecosystem functioning; concepts for
a safe and environmentally responsible use of the seafloor and sub-seafloor
resources; management models of transport pathways and impacts of pollutants,
key elements and nutrients in marine environments is the main task of modern
marine radioecology.
Another target is to develop a predictive capability for variations in ecosystem
functioning and structure for better assessment of naturally occurring mechanisms
of ecosystem behaviour. Research activities will address the effects of environmental factors and interactions at sea boundaries and interfaces in relation to
ecosystem functioning and alteration, distinguish natural from anthropogenic variability, assess the role of extreme environments and their communities. The
308
A. Strezov