| Reference organism | Reference biota |
| Earthworm | Soil invertebrate |
| Rat | Burrowing mammal |
| Bee | Above ground invertebrate |
| Wild Grass | Grasses, herbs and crops |
| Pine tree | Tree |
| Deer | Herbivorous mammal |
| Duck | Bird |
| Frog | Amphibian |
| Brown seaweed | Microalgae |
| Trout | Pelagic fish |
| Flat fish | Benthic fish |
| Crab | Crustaceans |