Akbar, Muhammad Faiz (2024) Dynamics of Plankton populations during High and low tide conditions in Morosari River, Sayung Village, Demak Regency, Central Java. Undergraduate thesis, Fakultas Sains dan Matematika Undip.

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Abstract

The occurrence of sea tides greatly influences the abundance and
distribution of plankton in river. Apart from tidal factors, various activities such as
the disposal of domestic and industrial waste, fishing boat traffic lanes, tourist areas,
and fishery activities take place along river can also result in changes of water
environment at Morosari River. The purpose of this study was to determine the
dynamics of plankton populations and the relationship between quality based on tides,
knowing the diversity, similarities, and dominance of plankton in the waters of Morosari
River. Plankton was collected every week in October 2023 for 4 weeks during
different tidal conditions at five stations. Determination of the sampling point was
carried out by purposive random sampling method. Plankton samples were taken as
much as 30L using a plankton net. Water quality measurements were carried out
with the Horiba water checker, and total phosphate testing was performed at the
Laboratory of The Ministry of Industry, Semarang. The process of observing
plankton using a binocular microscope while identification using several plankton
books and the Algaebase website. During the high tide, Chlorella vulgaris
dominated in SM 1 (Main Pantura Bridge), SM 2 (Residential areas) and SM 3
(Factories areas), together with Brachionus sp. During the low tide, there is an
increase in species dominance of Chlorococcum sp. The diversity index (H’) ranges
between 1.02-2.51, indicating that the conditions of the Morosari River have
medium stability. Evenness index (E) ranges between 0.20-0.91, describing an even
distribution. Dominance index (D) ranges between 0.10-0.55 shows that there are
no dominant species. Based on the saprobic index between 0.66 and 3.00, it
indicates that all stations belong to the β/α-Mesosaprobic - Oligo/saprobic category.
Several types of plankton that can be used as bioindicators of water quality include
Navicula spp., Cyclotella spp., and Fragilaria spp., and zooplankton, namely
Brachionus calyciflorus and Brachionus plicatilis
Keywords: Plankton, Tide, Dynamic, Morosari river, Saprobic index

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