Ecology 75 Ecosystems & Habitats 75 Life Sciences 75 NATURE 75 SCIENCE Wilderness Environmental Science (see also Chemistry 42 Environmental) 42 Environmental Science 33 Ökosystem 8 Ecologie 7 Ökologie 7 Écologie 6 Forest ecology 6 Biological invasions 5 Biotic communities 5 Chaînes alimentaires (Écologie) 5 Conservation 5 Food Chain 5 Food chains (Ecology) 5 Host-Parasite Interactions 5 Host-parasite relationships 5 Invasions biologiques 5 Recherche 5 Relations hôte-parasite 5 Research 5 Aquatic ecology 4 Biodiversité 4 Conditions environnementales 4 Environment 4