Diversity of Anemones in the Intertidal Zone of Perbatasan Tuban–Rembang Beach

Abstract

Sea anemones are marine invertebrates from the phylum Cnidaria of the Anthozoa class which have a flower-like shape. The habitat of sea anemones is in warm to cold waters, on the seabed, and attached to the substrate. Perbatasan Beach is located in Ngomben Hamlet, Sukolilo Village, Bancar District, Tuban Regency, East Java Province. The natural wealth of the sea on the beach is quite high, but information about the diversity of marine anemones on the coast of the Tuban - Rembang Border is still not available. This study aims to identify and describe the diversity of sea anemones in the Intertidal Zone of the Perbatasan Tuban - Rembang Beach. The method used in this research was the Visual Encounter method and direct observation using the transect line 1 m × 1 m. Diversity index using the Shannon Wienner formula. The results of observations obtained were as many as 33 sea anemones in the Intertidal Zone area. The results of identification using the Wildsingapore.com reference show that the sea anemones consist of 3 species belonging to the same family, namely Actiinidae. These sea anemone species include Paracondylactis sinensis, Anthopleura hermaphroditica, and Actinostella bradleyi. The greatest percentage of abundance is Actinostella bradleyi species in the lower intertidal zone by 54%. The diversity index of sea anemone species in the Intertidal Zone of the Border Coast of Tuban - Rembang shows that the diversity index value is around 1.19. This shows that the diversity of sea anemones in the Intertidal Zone of the Tuban - Rembang Border Coast is in the medium category.