ECOLOGICAL RISK ANALYSIS OF HARMFUL ALGAL BLOOMS (HAB) IN BIMA BAY, WEST NUSA TENGGARA
In April 2022, the HAB phenomenon was first reported in Bima Bay, West Nusa Tenggara. This event resulted in mass fish mortality and most of the Amahami coastal area was covered in brown gel-shaped biomass. This study was conducted to assess and map the ecological risk of HAB events in the Bima B...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/81631 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In April 2022, the HAB phenomenon was first reported in Bima Bay, West Nusa
Tenggara. This event resulted in mass fish mortality and most of the Amahami
coastal area was covered in brown gel-shaped biomass. This study was conducted
to assess and map the ecological risk of HAB events in the Bima Bay water
environment as a basis for sustainable bay management. Determination of
ecological risk was based on two scenarios, namely: 1) the vulnerability of the bay
and the potential occurrence of HABs associated with the pollutant load index (PLI)
and water quality index (WQI); and 2) the potential ecological impact due to the
occurrence of HAB associated with phytoplankton community structure. The PLI
calculation results at all stations are > 1, which means that there has been an
increase in environmental pollution. The pollutant index (PI) at eleven stations is
classified as moderately polluted and one station is classified as lightly polluted,
with an WQI of 31.67 or in the less category. Phytoplankton abundance in Bima
Bay ranged from 811 - 854,724 individuals/litre. The five most dominant
phytoplankton species were Pseudo-nitzschia spp., Chaetoceros spp., Lauderia
spp., Rhizosolenia spp. and Chatonella spp, and Chatonella spp. The level of HAB
risk in Bima Bay spatially based on the PI value and the proportion of the highest
toxic species sequentially obtained at stations 2 (Lewa Mori beach), 1 (Palibelo
pond area), and 3 (Bolo beach) with PI values of 5.83, 5.60, and 5.09 and toxic
proportions of 0.41, 0.38, and 0.3. The distribution of HAB tends to be concentrated
in the inner bay, especially on the east and south coasts. Temporally, based on the
results of chlorophyll index imaging, the potential for phytoplankton blooming is
relatively higher in the rainy season months |
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