Quality of Bilah River Labuhanbatu Regency, Indonesia (Review: Biodiversity of Gastropods)

Abstract

The purpose of this research is to know the biodiversity of gastropods in the Bilah River research is conducted starting from March, April and May in 2020. This research uses the Explorative Deskrptif method. Selection of research stations based on government administration or sub-district consisting of Pangkatan subdistrict, Rantau Selatan district and Bilah Barat district. Handsorting gastropod sampling. In data analysis is done calculation of diversity index (H '), evenness index (J '), the similarity Index (IS). The type of gastropods that can be in the river blade of Labuhanbatu Regency are 9 species: Anantome helena, Bellamya sp, Cerithidea cingulata, Melonoides torulosa, Melanoides tuberculata, Nassarius coronatus, Pomacea spp, Sulcospira testudinaria and Thiara scabra. The highest diversity index (H ') on station 9 (1.46) and the lowest station 4 (1.01) by medium category. The highest evenness index value on stations 9 (0.70) and lows at Station 4 (0.56) with the category Evenness index(J ') medium population. The highest Similaritas (IS) index on stations 3, 4, 5 and 7 (100%).