RIDIANCA, THERESIA ANGELINA (2023) KEANEKARAGAMAN DAN KELIMPAHAN GASTROPODA PADA VEGETASI MANGROVE DI KAWASAN LEGON NIPAH DAN LEGON LELE, PULAU KARIMUNJAWA (23dik395). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Theresia Angelina Ridianca. 26040119140105. Keanekaragaman dan
Kelimpahan Gastropoda Pada Vegetasi Mangrove di Kawasan Legon Nipah dan
Legon Lele, Pulau Karimunjawa. Ali Djunaedi dan Nirwani Soenardjo).
Ekosistem mangrove di Kepulauan Karimunjawa diketahui memiliki asosiasi
dengan komunitas gastropoda sebagai penyusun biotik ekosistem sekaligus menjadi
indikator lingkungan secara biologis. Data informasi yang didapatkan melalui hasil
monitoring lapangan digunakan sebagai baseline untuk mengetahui kondisi
keanekaragaman dan kelimpahan gastropoda pada ekosistem mangrove di Kawasan
Legon Nipah dan Legon Lele, Pulau Karimunjawa. Metode yang digunakan dalam
penelitian ini adalah metode eksplorasi yang memberikan penggambaran dan
interpretasi suatu kondisi secara sistematis. Sampel gastropoda diambil dengan
metode hand picking tanpa perantara alat tangkap dengan digelarnya transek 1x1m
di dalam plot mangrove 10x10m. Sampel gastropoda yang diambil merupakan
spesies epifauna dan treefauna. Pada Stasiun LN terdapat spesies Terebralia sulcata
yang paling banyak ditemukan, sedangkan spesies yang jarang adalah Planaxis
sulcatus. Nilai rata-rata kelimpahannya mencapai 590 ind/ha, indeks
keanekaragaman (H’) termasuk kategori sedang (2,737). Pada Stasiun LL terdapat
spesies Nerita planospira yang paling banyak ditemukan, sedangkan spesies yang
jarang adalah Cerithium coralium. Nilai rata-rata kelimpahannya mencapai 335
ind/ha, indeks keanekaragaman (H’) termasuk kategori sedang (2,244). Berdasarkan
hasil penelitian pada 2 stasiun dapat disimpulkan bahwa secara keseluruhan
ditemukan 25 spesies dan 10 famili gastropoda, dengan pola sebaran
mengelompok/clumped dan indeks kesamaan komunitas (S) berkategori tinggi
(71,794%). Pada masing-masing stasiun terdapat koefisien korelasi antara kerapatan
vegetasi mangrove dan kelimpahan gastropoda (korelasi positif dan hubungan sangat
kuat).
Kata kunci: Gastropoda, Mangrove, Keanekaragaman, Kelimpahan, Karimunjawa

ABSTRACT
(Theresia Angelina Ridianca. 26040119140105. Gastropod Diversity and
Abundance in Mangrove Vegetation on Legon Nipah and Legon Lele Area,
Karimunjawa Island. Ali Djunaedi dan Nirwani Soenardjo).
Mangrove ecosystems in the Karimunjawa Islands are known to have
associations with gastropod communities as biotic constituents of ecosystems as well
as biological environmental indicators. Information data obtained through field
monitoring results are used as a baseline to determine the condition of gastropod
diversity and abundance in mangrove ecosystems on Legon Nipah and Legon Lele
Area, Karimunjawa Island. The method used in this study is an exploratory method
that provides a systematic description and interpretation of an ecosystem condition.
Gastropod samples were taken by hand picking method without the intermediary of
fishing gear by laying 1x1m transect in 10x10m mangrove plot. Gastropod samples
were taken from epifauna and treefauna species. At Station LN, Terebralia sulcata
were the most abundant species, while the least abundant species was Planaxis
sulcatus. The average value of abundance reached 590 ind/ha, the diversity index
(H') was in the medium category (2.737). At Station LL, Nerita planospira were the
most common species found, while the rare species was Cerithium coralium. The
average value of abundance reached 335 ind/ha, the diversity index (H') was in the
medium category (2.244). Based on the results of research at 2 stations, it can be
concluded that over all 25 species and 10 families of gastropods were found, with a
clumped distribution pattern and a high community similarity index (S) category
(71.794%). At each station there is a correlation coefficient between mangrove
vegetation density and gastropod abundance (positive correlation and very strong
relationship).
Keywords: Gastropods, Mangrove, Diversity, Abundance, Karimunjawa

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