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ABSTRAK Telah dilakukan penelitian dengan tujuan untuk mengetahui keanekaragaman spesies dan zonasi habitat Echinodermata di perairan pantai Semerang Kabupaten Lombok Timur. Survei lapangan dilakukan dengan metode transek kuadrad dan koleksi bebas selama bulan Maret – Juni 2013. Berdasarkan hasil penelitian, di Pantai Semerang ditemukan 26 spesies Echinodermata yang terdiri atas Echinoidea (13 spesies), Asteroidea (7 spesies), Ophiuroidea (3 spesies) dan Holothuroidea (3 spesies). Habitat Echinodermata di panatai Semer ang terbagi atas 5 zona yaitu rataan karang (reef flat), pasir (sand), padang lamun (seagrass bed), patahan karang (rubble), dan terumbu karang (corral reef). Nilai Indeks Keanekaragaman berbeda pada masing-masing habitat. Indeks Keanekaragaman Shannon – Wiener (H ) terbesar ditemukan pada habitat terumbu karang (H =2,59) kemudian diikuti oleh pasir (H=2,30), patahan karang (H=2,17), padang lamun (H =1,93) dan rataan karang (H=1,48). Indeks Evenness terbesar ditemukan pada habitat pasir (E=0,96) diikuti oleh rataan karang (E=0,92), terumbu karang (E=0,86), patahan karang (E=0,75) dan padang lamun (E=0,67). Indeks Margalef (R) terbesar ditemukan pada habitat terumbu karang (R=5,02) kemudian diikuti oleh patahan karang (R=4,07), pasir (R=3,79), padang lamun (R=3,62)dan rataan karang (R=1,41). Kelas Echinoidea ditemukan pada semua zona, Asteroidea dan Holothuroidea tidak ditemukan pada zona rataan karang sedangkan Ophiuroidea hanya ditemukan pada zona patahan karang dan terumbu karang. Kata Kunci : keanekaragaman, zonasi habitat, Echinodermata, pantai Semerang ABSTRACT Research was conducted in order to determine the diversity of species and habitat zonation of Echinodermata in Semerang coastal waters East Lombok. The field survey was conducted using transects kuadrad and free collection during March to June 2013. Based on the results, in the Semerang Coast was found 26 species of Echinoderm which consist of Echinoidea (13 species), Asteroidea (7 species), Ophiuroidea (3 species ) and Holothuroidea (3 species). Echinoderms habitat in Semerang divided into 5 zones,  consist of reef flat, sand, seagrass beds, rubble, and coral reefs. Diversity index values differ in each habitat. Shannon - Wiener index (H ) were largest on coral reef habitats (H  = 2.59 )and then  followed by sand (H  = 2.30), rubble (H  = 2.17), seagrass (H  = 1, 93) and the reef flat (H  = 1.48). Greatest Evenness index was found in the sand habitat (E = 0.96) followed by a reef flat (E = 0.92), coral reefs (E = 0.86), rubble (E = 0.75)and seagrass beds (E = 0.67). the largest found Margalef Index (R), was found in coral reef habitats (R = 5.02) and then followed by rubble (R = 4.07), sand (R = 3.79), seagrass bed (R = 3.62) and reef flat (R = 1.41). Class of Echinoidea has found in all zones, Asteroidea and Holothuroidea not found on the reef flat zone while Ophiuroidea only found in the rubble and the coral reef zone. Key words: diversity, habitat zonation, Echinoderm, Coast Semerang

jurnal biologi tropis/jurnal biologi tropis

Keanekaragaman Spesies dan Zonasi Habitat Echinodermata di Perairan Pantai Semerang, Lombok Timur (Diversity of Species and Habitat Zonation of Echinoderm in Semerang Coastal Waters, East Lombok)