Paraprionospio pinnata (Ehlers, 1901) (Polychaeta : Spionidae), kemungkinan pemanfaatannya sebagai hewan bioindikator

Paraprionospio Pinnata (Ehlers, 1901)( Polychaeta: Spio-Nidae ), and Its Possible Use as Bioindicator. Paraprionospio pinnata which is important of makrobenthic species belongs to the polychaeta (Spionidae). This species is divided into four types (Ay B, Cl, C2) on the basis of the external morphology\ areal distribution and habitat preference. They are recognized as discrete species respectively. Type A is a species restricted in inshore waters less than 20 m in water depth. Type B is an inland sea mud or muddy sand bottom species. Type Cl is an eutropic species and widely distributed in various environment. Type C2 is an offshore waters species. Only types A and B are useful for eutrophic indicators, and do not have an opportunistic nature. Type A has a good adaptation to eutrophic tolerance and the timing of the settlement. Type B chiefly depends on physiological tolerable ability for the prosperity in eutrhophic areas.