Daya Bay, a nature reserve for fisheries, has seen a decrease in species diversity of macrobenthic fauna over the past two decades due to habitat degradation from human activities. In 1987-1988, an average of 50.6 species were found per station, but by 2004, this number dropped to 7.6. The diversity indices also declined during this time period. The north of Daya Bay still has higher diversity than the south, but overall, there have been significant changes in the types of species present in the area.