PUTRI, MARISSA SABILLA (2026) PENGARUH NITRAT TERHADAP KELIMPAHAN DAN INDEKS BIOLOGI FITOPLANKTON DI DANAU LAUT TAWAR. S1 thesis, UNIVERSITAS MALIKUSSALEH.

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Abstract

ABSTRACT Nitrate is a nutrient that plays an important role in phytoplankton growth; therefore, changes in its concentration may influence phytoplankton abundance and community structure. This study aimed to analyze the dynamics of nitrate concentration and phytoplankton abundance, as well as the influence of nitrate on phytoplankton. abundance and biological indices. The research was conducted from July to September 2025 at Lake Laut Tawar, Central Aceh Regency. Sampling was carried out at three depths: the surface, Secchi disk depth, and euphotic depth during both morning and midday periods. Data were analyzed using descriptive statistics, One-Way Anova, independent-sample t-tests, Kruskal-Wallis and Mann-Whitney tests, Spearman’s correlation, and linear regression. The results showed a significant increase in nitrate concentration across the months, although no significant differences were observed between observation time or depths. Phytoplankton abundance ranged from 5,165 - 15,046 cells/L. Values for the diversity index ranged from 1,53 - 2,29, the evenness index from 0,70 - 0,88, and the dominance index from 0,12 - 0,26. Correlation and regression analyses indicated that nitrate concentration had a weak relationship and a weak influence on phytoplankton abundance and biological indices. It is concluded that changes in the phytoplankton community structure in Lake Laut Tawar are influenced not only by nitrate concentration but also by other environmental factors. Keywords: Abundance, Biological indices, Lake Laut Tawar, Nitrate, Phytoplankton,

Item Type:	Thesis (S1)
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions:	Fakultas Pertanian > 11901 - Jurusan Ilmu Kelautan
Depositing User:	Marissa Sabilla Putri
Date Deposited:	18 Sep 2026 07:50
Last Modified:	18 Sep 2026 07:50
URI:	https://rama.unimal.ac.id/id/eprint/23029

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