Coral reefs are spectacular marine ecosystems known for their diversity of eye-pleasing fish and corals. In the Caribbean, overfishing and increased nutrient loading from land water run-off is believed to be responsible for declines in herbivorous fish populations which allowed the sea urchin Diadema antillarum, to dominate the coral reefs. In 1981 a hurricane severly damaged the coral reefs. The sea urchin continued to graze on the algae which allowed the coral to recolonize the reefs. In subsequent years the urchin was hit hard by a pathogen and as a consequence, was no longer in a position to control the algae. Fleshy brown algae came to dominate the reefs. The adult algae that now covers the reefs are largely unpalatable to the remaining herbivores, which serves to keep the reefs in this state of algal dominance.
Resiliencia ..alem da sustentabilidade Skye M.Sc. (IESD) UniGaia-Brasil.org [email_address]
As paradigmas do sistema Visões / historias do sistema Auto-organização Reglas do sistema Movimento Informação Criar feedback positivo Regula feedback negativo Movimento Materias Numeros (impostos, juros)