- Organisms responsible for maintaining
- integrity
- determining the numbers of organisms
Examples:
- Ecosystem Engineers
- Top Carnivores / Apex Predators
- Tiger
- lion
- cheetah
- snow leopard
- sea otter
- Chief Pollinators
- Agents of Pollination
- Honey bee
- butterfly
- bumble bee
- wasp
- Agents of Pollination
- Micro-organisms