Keanekaragaman Bivalvia, Gastropoda, dan Holothuroidea di Zona Intertidal Pantai Utara Laut Jawa, Indonesia

This study aims to know diversity of Bivalvia, Gastropoda and Holothuroidea.
Measures used in this study were Density Index (D), Diversity Index (H’), Evennes
Index (E’) dan Important Value Index (INP). This study used transect sampling
method by 1 × 1 meter quadrant. Target species of this study were member of
Bivalvia, Gastropoda and Holothuroidea that inhabit in intertidal zone of north
Javan Sea coastal. This intertidal zone was divided into 3 zone; zone I is 50 meter,
zone II is 75 meter and zone III is 100 meter from coastal line to sea. Total sample of
this species were 1064 individual, that divided into 7 species of Bivalvia, 10 species
of Gastropoda and 2 spesies of Holothuridea. The highest Diversity Index was for
Gastropoda in zone I (253 individual/m2). Diversity Index was in moderate category
(1< H’ < 2) while the zone III was the highest. Evennes Index of all zones were
relatively similar. The highest Important Value Index was species of Clypeomorus
clypeomorus, that has value 53,06%.