- Ecology 35
- Freshwater & Marine Ecology 28
- Environmental Management 18
- Zoology 17
- Ecotoxicology 11
- Applied Ecology 6
- Atmospheric Protection/Air Quality Control/Air Pollution 6
- Biodiversity 6
- Sustainable Development 5
- Environment, general 4
- Hydrology/Water Resources 4
- Life Sciences, general 4
- Nature Conservation 4
- Plant Sciences 4
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 4
- Atmospheric Sciences 3
- Bioorganic Chemistry 3
- Ceramics, Glass, Composites, Natural Materials 3
- Environmental Engineering/Biotechnology 3
- Hydrogeology 3