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SHERLYNA ZADA ARIFAH

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Judul Artikel

Abstrak (Bhs. Indonesia)

Kawasan Edukasi Mangrove Demang Gedi di Purworejo merupakan ekosistem 
yang subur dan berpotensi menghasilkan nutrien melimpah bagi biota perairan. 
Topografi dan aktivitas manusia seperti tambak, pertanian, serta pemukiman 
menjadi sumber utama masuknya nitrat (NO₃⁻) dan fosfat (PO₄³⁻). Nutrien ini 
dimanfaatkan oleh fitoplankton sebagai produsen primer, sehingga 
meningkatkan produktivitas perairan dan mempengaruhi kelimpahan biota 
seperti moluska. Penelitian ini bertujuan mengetahui konsentrasi nitrat dan 
fosfat, kelimpahan moluska, serta hubungan keduanya. Metode yang digunakan 
adalah survei lapangan dengan pendekatan kuantitatif dan analisis statistik 
ekologi. Analisis sampel fosfat mengacu pada SNI 6989.31:2021 dan nitrat 
menggunakan metode IK-DR900.1/LABLI-KBM. Hasil penelitian menunjukkan 
konsentrasi nitrat 0,71–2,56 mg/L dan fosfat 0,16–0,77 mg/L, dengan 
kelimpahan moluska 32–112 ind/m². Korelasi antara moluska dan nitrat sebesar 
r = -0,229 dan dengan fosfat r = -0,139, menunjukkan hubungan negatif lemah, 
serta adanya faktor lain yang turut mempengaruhi kelimpahan moluska seperti 
salinitas, DO, dan suhu.

Abtrak (Bhs. Inggris)

Mangrove Education Area of Demang Gedi in Purworejo is recognized as a fertile 
ecosystem with the potential to generate abundant nutrients for aquatic biota. The 
topography and human activities such as aquaculture, agriculture, and settlement are 
identified as the main sources of nitrate (NO₃⁻) and phosphate (PO₄³⁻) inputs. These 
nutrients are utilized by phytoplankton as primary producers, thereby increasing water 
productivity and influencing the abundance of biota such as mollusks. This study was 
conducted to determine the concentrations of nitrate and phosphate, the abundance of 
mollusks, and their relationship. A field survey method with a quantitative approach and 
ecological statistical analysis was applied. Phosphate analysis was carried out based on 
SNI 6989.31:2021, while nitrate was analyzed using the IK-DR900.1/LABLI-KBM 
method. The results showed that nitrate concentrations ranged from 0.71 to 2.56 mg/L 
and phosphate from 0.16 to 0.77 mg/L, with mollusk abundance ranging from 32 to 112 
ind/m². The correlation between mollusks and nitrate was obtained at r = -0.229 and with 
phosphate at r = -0.139, indicating a weak negative relationship. Other factors such as 
salinity, DO, and temperature were also considered to influence mollusk abundance.

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