Radioecology in 2014 Current research directions and trends for the future. Union Internationale de Radioécologie International Union of Radioecology
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1 Radioecology in 2014 Current research directions and trends for the future
2 What is Radioecology A multidisciplinary scientific discipline: biology, chemistry, physiology, ecology, biogeochemistry, geophysics, ecotoxicology, mathematics (models, statistics), metrology, centered on the environment, aimed at describing, understanding and predicting - the fate of radioactivity in environmental systems, (artificial and natural) - its impact on man (via the environment) and on the environment itself (biota, ecosystems) (human and ecological risk assessment) - biogeochemical processes by means of tracer studies
3 Main research directions of radioecology On-going move from anthropocentric to ecocentric Conclusion: challenges from Fukushima
4 The main research directions of Radioecology Axis 1: Source term Speciation, mobility (in the various environmental media) Axis 2: Transfers In abiotic compartments, within the human food chain In abiotic compartments, within the biota trophic network Axis 3: Effects (On man) On biota, populations, ecosystems Axis 4: Risk assessment Human risk assessment Ecological risk assessment (organism-based/ecosystem-centred approach) Axis 5: Tracer studies Biogeochemical cycles, ocean streams, run-off
5 AXIS 2 Transfers In abiotic compartments ATMOPHERE Within the human food chain Within biota trophic networks AXE 2 STOCKAGE DECHETS AXIS 3 AXIS 1 Source term Speciation, mobility Effects (On man) Releases (normal, accidental) On biota, ecosystems BIOSPHERE TNORMs Life support Services AXIS 4 Risk assessment Flora Human risk assessment Ecological risk assessment AXIS 5 Tracer studies Waste in deep geological repository GEOSPHERE Scientific designs Experimental approaches, models, field investigations Biogeochemical cycles, streams, run-off
6 AXIS 2 Transfers In abiotic compartments ATMOPHERE Within the human food chain Within biota trophic networks AXE 2 AXIS 1 Source term STOCKAGE DECHETS AXIS 3 Speciation, mobility Effects (On man) Releases (normal, accidental) On biota, ecosystems BIOSPHERE TNORMs Life support Services AXIS 4 Risk assessment ECOSYSTEM Fauna Flora Human risk assessment Ecological risk assessment AXIS 5 Tracer studies Waste in deep geological repository GEOSPHERE Scientific approaches Experimental designs, models, field investigations Biogeochemical cycles, streams, run-off
7 Radionuclides transfers TRANSLOCATION REPARTITION - BIOACCUMULATION TF=[A]plant/[A]soil CF=[B]fish/[B]water Absorption - Excretion Biocellular localisation PLANTS Bioindicators Physiology FOLIAR TRANSFERS AQUATIC ORGANISMS Cuticules - Stomata Canopy structure ROOT TRANSFERS Rhizosphere Microorganisms Trophic nets Physiology ATMOSPHERE SOIL SOLUTION Mineralisation Speciation Organic matter TRANSFERS WATER Speciation Bioturbation Sedimentation Ions Minerals MIGRATION SOIL Speciation HYDRIC EROSION Urban surfaces, agricultural and natural TERRESTRIAL SEDIMENTS MES Spéciation AQUATIC
8 Radiation effects on wildlife: missing knowledge Research priorities Long-term (trans-generational) Low doses and dose rates Internal contamination Observations at population, community and ecosystem level More species (biodiversity)
9 Context Historical anthropocentric approach External (to man) medium (exploitation of abiotic resources) Environment Sources PLANTS ANIMALS Linear Transfers Man Animals and plants, but only for agricultural purposes (produce human food) Animals and plants as vectors of contamination to humans, not as targets Man was considered out of the environment, and as the exclusive target of concern
10 Context From anthopocentric to biocentric today Environment Environment Sources Pristine nature (the wilderness and its biota, fauna and flora) PLANTS Man ANIMALS Radioactivity effects on wild animals and plants Animals and plants as targets Linear Transfers to biota Effects
11 Effects under chronic exposure 10 µ Gy.h-1 Screening Dose rate µgy.h-1 (mgy.d-1) 1 mgy.d-1 < 102 (< 2.5) Plants Fishes Mammals Reprod. anomalies Alt. Germ cells Reduced fecundity Chromosome aberrations 10 mgy.d-1 Recent literature compilation (ERICA EC project) (2.5-25) (25-125) ( ) Growth red. Morphologic al alt. Populations alt.. Canop. ind. modification Growwth reduction Photosynth. reduction Coniferous mortality Leaves growth reduct. & mortal. Reduction of seeds Germ cells alteration. Reduced fecundity Par. Nuptial Reduced fertility Increased sterility Reduced spermatogenesis Larvaes mortality Severe sterility Vertebrae growth reduction Brain cells mortality Germ cells alteration Increased sterility Reduced survival Weight reduction Ovaries malfunction Sterility ( ) Mortality of embryos > (>500) Reduction of reproductive potential Grass mortality Herbacées M > 105 (>5000) Mortality of all plants > 106 (>50000) Reduction of biodiversity Effect endpoints focused on individual organisms: Mortality Morbidity Reproductive success Chromosome damage
12 Ecosystemic approach Toxicological approach Xenobiotic introduction Individual physiological and behavioral parameters Chromosome damage Lesions and necrosis Tumors and teratogenic effects Reproductive success Behavioral alterations Mortality DNA-RNA Membrane receptors Compensatory behaviors Key enzymes Biochemical integrity Community parameters Structure Diversity Energy transfer efficiency Stability Successional state Chemical parameters Ecosystem effects Site of action Biotransformations Enzyme induction Glutathione S Transferase Mixed functions oxidases hydrolases DNA repair enzymes Biochemical parameters Stress proteins Metabolic indicators Acetylcholinesterase inhibition Adenylate energy charge Metallothionin production Immunological suppression Population parameters Population density Productivity Mating success Alterations in genetic structure Competitive alterations
13 Ecosystem approach for ERA Tomorrow: moving to an ecocentric view with the ecosystem approach Environment including man Oxygen Biomass Water Ecosystem = biotope + biocenose PRODUCERS CONSUMERS Man Minerals Water CO2 DECOMPOSERS Biomass Waste CO2 - Services (waste recycling, provision of ressources, ) - Life support (water recycling, air bioregeneration, biomass production, )
14 Conclusion: How is radioecology challenged by Fukushima? Remediation, mitigation, decontamination techniques (terrestrial) Speciation, Impacts on the marine ecosystem In-sediment accumulation? Long-term distribution and impact on the local marine trophic network Better understanding of the multiple stressors context Tsunami physical reshaping of the coastal area Radioactive releases to the environment (terrestrial and marine) Integrated Ecological risk assessment Tracer studies Ocean streams, run-off
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