The keystone species, that if removed, would disrupt the entire food web in an anchialine pool (wai 'opae) is the
- ae'o as the birds provide eggs for invasive predators to eat
- 'opae 'ula shrimp that eat algae & are eaten by ae'o birds
- tilapia as they don't grow well anywhere else except in anchialine pools
- cyanobacteria as it's not so sunny and it hardly grows otherwise