Low wind speeds, lower atmospheric temperatures, higher rainfall and lower sea surface temperatures are cited as possible environmental signs.
Low wind speeds, lower atmospheric temperatures, higher rainfall and lower sea surface temperatures are cited as possible environmental signs.
It is almost August, and probably, the time for heavy rains and blooms along the beaches in Chennai.
Adequate nutrients brought in by ample rainfall and high abundance of plankton, called diatom Thalassiosira sp. bloom trigger (bioluminescent) noctiluca scintillonsAccording to a study conducted by the National Center for Coastal Research (NCCR).
Plankton is available in the ocean and due to the available nutrition, it will multiply and bloom. The report cited low wind speeds, lower atmospheric temperatures, higher rainfall and lower sea surface temperatures as possible environmental signs, the report said.
Local hydrodynamics and diverging currents modulate the appearance and dispersal of a sudden outbreak of bioluminescent dinoflagellate noctiluca scintillons bloom in the field.
The paper, which was authored by Pravakar Mishra, Mahmuda Begum, Anita Gera and others and recently published in the scientific journal oceanographyThe blooming event focuses on a 16-km stretch after heavy rains in August 2019.
During this period, when the team took physical samples from beaches including Marina, Elliots, Panayurkuppam, and Kovalam, wind speeds were 5 m/s low, temperatures dropped, a day high rainfall was recorded, and the sea surface The temperature was low. ,
density of noctiluca scintillons Varying from 1,000 cells/l to 19,000 cells/l, with a typical distribution pattern. abundance cintillons Panaiyurkuppam and Kovalam were recorded with 19,000 cel/l and 18,000 cel/l respectively.
The paper explained that once the bloom subsides, there is an increase in the bacterial population associated with the phyto-plankton bloom. The lowest count was recorded at Panayurkuppam beach and the highest at Elliot’s beach. Total coliform was also recorded in waves.
Bioluminescence observed due to turbulence and rapid wave break in the surf zone, which stimulates bioluminescence noctiluca scintillons cells. Within two days after bioluminescence appeared, bloom cells gradually degenerated and moved away from the stream, and finally declined.