Diversitas Plankton di Perairan Pantai Sire Kabupaten Lombok Utara

Abstract

Plankton has an important role for aquatic ecosystems, especially in the food network in a waters. This study aims to assess the abundance and diversity index of plankton in Sire Beach, North Lombok Regency. The study was conducted in September 2019 using purposive sampling with 9 sample points. The water sample was filtered using plankton net then put into the sample bottle for identification in the laboratory. Shannon-Wienner Index was used for determining diversity of plankton species. The types of plankton found were 12 genera of phytoplankton from the Bacillariophyta group, including: Biddulphia, Coscinodiscus, Cocconeis, Cylindrotheca, Diploneis, Fragilaria, Gyrosigma, Licmophora, Navicula, Nitzschia, Pleurosigma, and Triceratium. The highest abundance of phytoplankton belonged to Coscinodiscus species as many as 1.380 cells/l at station 2.3. The high abundance of Coscinodiscus might be due to a nutrient supply in these waters. Seagrass ecosystem was thought to have an important role in obtaining nutrients for phytoplankton. Diversity index has a value which ranges between 1.117505-1.841236 showing that it is in the medium category. The uniformity index ranges from 0.450718-0.673373 indicating that the distribution of plankton species in each station is even. The dominance index ranges from 0.233508-0.522215. This shows that there is no type of plankton that dominates the waters of Sire Beach. This is due to the abundance of plankton species at each station which is fairly evenly distributed.

Kelimpahan Fitoplankton Sebagai Indikator Kualitas Perairan Di Perairan Laut Labangka, Kabupaten Sumbawa

“…Berdasarkan hasil perhitungan indeks diversitas, diperoleh bahwa indeks diversitas fitoplankton berkisar antara 2,1372-2,5466 sehingga dapat dikatakan bahwa perairan memiliki tingkat keanekaragaman yang sedang (Astriana & Larasati, 2021). Sementara itu, hasil perhitungan indeks keragaman fitoplankton berkisar antara 0,8651-0,9297 sehingga diketahui bahwa keseragaman antar spesies tergolong merata.…”

“…Hasil perhitungan menunjukkan bahwa indeks diversitas berkisar antara 2,1372-2,5466. Hal ini menunjukkan bahwa perairan Labangka memiliki tingkat keanekaragaman yang sedang dan menunjukkan bahwa stabilitas komunitas fitoplankton berada pada tingkat sedang (Astriana & Larasati, 2021).…”

“…Hal ini menunjukkan bahwa keseragaman antar spesies tergolong merata karena nilai tersebut mendekati angka 1. Akan tetapi, jika indeks keseragaman mendekati 0, maka dapat dikatakan bahwa keseragaman antar spesies tergolong rendah (Astriana & Larasati, 2021).…”

“…Hal ini menunjukkan bahwa tidak ada genera yang mendominasi pada perairan tersebut. Menurut Astriana & Larasati (2021), apabila indeks dominansi mendekati 0, maka Jurnal Perikanan, 12 (4),710-721 (2022) Astriana et al, (2022) http://doi.org/10.29303/jp.v12i4.400 tidak ada genus yang dominan, sedangkan jika indeks dominansi mendekati 1, maka ada genera yang mendominasi.…”