Lamun adalah tumbuhan berbunga yang dapat tumbuh dengan baik pada lingkungan laut dangkal. Penelitian ini dilaksanakan di Pesisir Desa Lihunu dengan menggunakan metode purposive random sampling yang dilaksanakan pada bulan Agustus 2015 saat surut terendah. Analisis data meliputi perhitungan dengan menggunakan rumus menurut Shannon & Wienner dan buku identifikasi lamun. Berdasarkan hasil penelitian terdapat tujuh jenis lamun yang ditemukan yaitu, Enhalus acoroides (L.f.) Royle, Thalassia hemprichii (Ehrenberg) Ascherson, Cymodocea rotundata (Ehrenberg) Ascherson, Cymodocea serrulata (R. Brown) Ascherson, Halophila ovalis (R. Brwon) Hooker, Halodule pinifolia (Miki) den Hartog dan Syringodium isoetifolium (Ascherson) Dandy. Lamun Enhalus acoroides dan Thalassia hemprichii memiliki penyebaran terluas, karena ditemukan di seluruh transek pada lokasi penelitian. Jenis yang jarang dijumpai adalah Halophila ovalis dan Cymodocea serrulata. Jumlah individu lamun yang ditemukan adalah 2316 individu. Nilai indeks keanekaragaman di Pesisir Desa Lihunu memperlihatkan bahwa di wilayah ini keanekaragaman jenis lamun sedang dengan H’ = 1 ≤ H’ ≤ 3.Seagrass is flowering plants that can grow so well in shallow marine environments. This research was conducted in Seashore Lihunu Village on August 2015 using field observation with purposive random sampling when low withdraw. Data analysis was performed using the formula of Shannon-Wienner and identification of seagrass. Results obtained in this research showed that there are seven types of seagrass, namely Enhalus acoroides (L.f) Royle, Thalassia hemprichii (Ehrenberg) Ascherson, Cymodocea rotundata (Ehrenberg) Ascherson, Cymodocea serrulata (R. Brown) Ascherson, Halophila ovalis (R. Brwon) Hooker, Halodule pinifolia (Miki) den Hartog and Syringodium isoetifolium (Ascherson) Dandy. Enhalus acoroides and Thalassia hemprichii have wide distribution because they can be found in all transect line at research site. Species that are rarely found are Halophila ovalis and Cymodocea serrulata. Number of individual found was 2316 individuals. Value of diversity index at Seashore Lihunu Village showed that this area has moderate seagrass diversity with H’ = 1 ≤ H’ ≤ 3.
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