Hubungan Kerapatan Mangrove Terhadap Kepadatan Moluska di Dusun II Desa Pulau Sembilan Kecamatan Pangkalan Susu Kabupaten Langkat Provinsi Sumatera Utara

ABSTRAK

NURUL ANDRIFA NASUTION. Hubungan Kerapatan Mangrove terhadap
Kepadatan Moluska di Dusun II Desa Pulau Sembilan, Kecamatan Pangkalan
Susu, Kabupaten Langkat, Provinsi Sumatera Utara. Di bawah bimbingan
YUNASFI dan AHMAD M RANGKUTI.

Mangrove berperan sebagai habitat bagi organisme yang terdapat di
dalamnya, salah satunya ialah Moluska. Kelimpahan dan keragaman Moluska,
sangat bergantung pada daya toleransinya terhadap perubahan lingkungan.
Penelitian ini bertujuan untuk menelaah kepadatan Moluska dan bagaimana
hubungannya terhadap kerapatan mangrove yang terdapat di Pulau Sembilan.
Penelitian ini dilakukan pada bulan Maret sampai Mei 2016. Penelitian
menggunakan metode Purposive Random Sampling dengan cara pengambilan dan
pengamatan vegetasi mangrove dan kepadatan Moluska, serta pengukuran
parameter kualitas air. Analisis data meliputi, analisis vegetasi mangrove, analisis
Moluska, analisis kualitas air dan analisis substrat. Ditemukan 9 spesies Moluska
di lokasi penelitian yaitu N. balteata memiliki komposisi tertinggi sebesar 32%.
C. capucinus 25%, C. cingulata 24%, L. melanostoma 7%, L. scabra 4%. C.
obtusa dan T. telescopium memiliki komposisi yang sama yaitu sebesar 3%. N.
dorsatus 2% dan P. cochlidium 0%. Hubungan antara kerapatan spesies mangrove

terhadap kepadatan Moluska di Pulau Sembilan ditunjukkan dengan persamaan y
= 0,022x - 59,77 dengan R2 sebesar 0,851 dan r = 0,922. Dari hasil analisis uji
Anova diperoleh nilai F hitungnya sebesar 548,318 dan F Tabelnya sebesar 7,708
nilai signifikan sebesar 0,00001 (p < 0,05).

Kata Kunci : mangrove, Moluska, keragaman jenis

i
Universitas Sumatera Utara

ABSTRACT

NURUL ANDRIFA NASUTION. A Relationship between Density of Mangrove
to Density of Molluscs in the Village of Pulau Sembilan District of Pangkalan
Susu, Langkat, Province of North Sumatra. Under academic supervision by
YUNASFI and AHMAD M RANGKUTI.

Mangroves serve as a habitat for organisms that are present in it, one of
which is Molluscs. The abundance and diversity of molluscs are very dependent
on the power of tolerance to environmental changes. This research was aimed to

analyze density of Molluscs and how a relation with density of mangrove in the
Village of Pulau Sembilan. This research is done in Maret to April 2016. The
study used purposive random sampling method by taking and observation of
mangrove vegetation and density of molluscs and measurement of water quality
parameters. Data analysis included analysis of mangrove vegetation, analysis of
Molluscs, analysis of water quality and analysis of the substrate. Found 9 species
of Molluscs at the research site are Nerita balteata has the highest composition of
32%. Chicoreus capucinus 25%, Cerithidea cingulata 24%, Littorina
melanostoma 7%, Littorina scabra 4%, Cerithidea obtusa and Telescopium
telescopium have the same compsition that is equal to 3%. Nassarius dorsatus
2% and Pugilina cochilidium 0%. The relationship between the density of
mangrove species to the density of Molluscs in Pulau Sembilan indicated by the
equation y = 0,022x - 59.77 with R 2 of 0.851 and r = 0.922. From the analysis
ANOVA test counted the F value of 548.318 and F table is of significant value of
0.00001 7.708 (p