Abstract:
Phytoplankton has been known to play its role as an indicator of water quality. In the
intensive cultivation system of Pacific White Shrimp (Litopenaeus vannamei),
phytoplankton can respond to water quality dynamics simultaneously. However, the
impact of weather differences on community structure and phytoplankton diversity has
not been further investigated. Here we analyze water quality and phytoplankton
diversity in ponds, including uniformity and dominance. The results showed that 12
genera of phytoplankton were found in sunny weather, whereas 9 genera were found
in rainy weather. Phytoplankton diversity in sunny weather is greater. The diversity
index (H') value when it rains and shines is in the medium category with a stable
community structure and low polluted water conditions. The uniformity value (E') is
moderate. No plankton dominance was found (C ≤ 0.5) with the highest important
index value during rain being Rhizosolenia sp. and Chlorella sp. when it's sunny.
Water quality in general does not differ and meets quality standards except for the
nitrate and phosphate values. Nitrate and phosphate values in both weather conditions
exceeded standard standards. Differences in the types of phytoplankton present in
different weather can be caused by the brightness that enters the water. Apart from
that, the volume of water and the dilution and mixing effect of rainwater can cause
differences in the amount. The source of growth nutrients is a supporting factor for
phytoplankton growth.
