- Ecology 14
- Freshwater & Marine Ecology 10
- Plant Physiology 9
- Plant Sciences 9
- Microbiology 6
- Biotechnology 4
- Life Sciences, general 4
- Atmospheric Protection/Air Quality Control/Air Pollution 3
- Ecotoxicology 3
- Environment, general 3
- Environmental Chemistry 3
- Environmental Health 3
- Geoecology/Natural Processes 3
- Microbial Ecology 3
- Nature Conservation 3
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 3
- Water Quality/Water Pollution 3
- Zoology 2
- Agriculture 1
- Biochemistry, general 1