Nurfitrian, Fakhrizain Nahla (2024) Plankton as Bioindicator of Water Quality in Lake Batur, Bali. Undergraduate thesis, Fakultas Sains dan Matematika Undip.

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Abstract

Lake is one of the freshwater ecosystems on the earth’s surface, and they are
important for human life. The object of this research is Lake Batur, the largest lake
in Bali and it is essential to use as a water supplier for the Bali area. However, its
utilization was not accompanied by management efforts, which caused water
quality degradation. To solve this problem, the local government released a
regulation and ran several programs to overcome these problems, one of them by
restoring the lake condition through monitoring the lake water quality and
identifying aquatic biota. Plankton was chosen as bioindicator because it can
quickly respond to changes in the environment and serve as an essential biomarker
for measuring water quality and indicators of water pollution. This research aims to
examine the plankton community structure, water quality condition, and nutrient
contents in Lake Batur. The plankton collection was carried out in nine locations
with three times repetition, then put it into a 150 ml bottles. Based on the research
results, 62 phytoplankton and 17 zooplankton species were identified. The most
common division was Chlorophyta and the most common species was Chroococcus
sp., which indicate pollution by nutrients. The plankton community structure results
from the diversity index (H’), evenness index (E), and dominance index (D)
showed that Lake Batur was under ecological pressure. As for water quality, the
saprobic index results showed that Lake Batur had a β-Mesosaprobic to α/β-
Mesosaprobic pollution status, caused organic and inorganic compounds pollutants.
Lastly, for nutrient content in the waters, the results of the Specific Pollution
Sensitivity Index (IPS) showed that it was in mesotrophic and eutrophic status,
which means there is a lot of nutrient content in the waters.
Keywords: Lake Batur, water quality degradation, plankton community structure,
water quality, and nutrient content

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