Diel variations in density and diversity of micro-phytoplankton community in and around a barachois-based oyster culture farm

Ravindra Boojhawon, . and Deepeeka Kaullysing, . and Estela Casareto Beatriz, . and Yoshimi Suzuki, . and Mouneshwar Soondur, . and Ranjeet Bhagooli, . and Ryan Lowe, . Diel variations in density and diversity of micro-phytoplankton community in and around a barachois-based oyster culture farm. pp. 2-17. ISSN 2672-7226

Knowledge of diel variations in phytoplankton communities is important to set up and plan a successful and sustainable bivalve aquaculture industry. This study investigated the diel (24-hour cycle) variations in micro-phytoplankton community during two high and two low tides over two alternate days in summer at a barachois-based oyster farm in Mauritius a micro-tidal tropical island. Micro-phytoplankton density and diversity sea surface chlorophyll a concentration and physico-chemical parameters such as sea surface temperature dissolved oxygen pH and salinity were assessed each day during high and low tides at an interval of approximately six hours at 11 stations. Despite the small tidal range significant diel variations in micro-phytoplankton density were noted throughout the tidal cycle. Highest densities of micro-phytoplankton and diversity of diatoms dinoflagellates and cyanobacteria were recorded at stations three and six (S3 and S6). The range of total micro-phytoplankton at S3 and S6 varied above 2.0 x 10� cells L- and for the other stations it varied mainly between 1 to 2 x 10� cells L- throughout all the tides except on the second sampling day where at S1 and S7 the density was slightly above 2 x 10� cells L-. The diatom Coscinodiscus (14 ) the dinoflagellates Peridinium (18 ) and the cyanobacteria Anabaena (24 ) were dominant. S3 and S6 within the barachois having a low flushing rate were characterized by the highest availability of food stock inferring that these stations may sustain an optimal growth of bivalves. These findings may be useful in directing the barachois-based bivalve culture site towards a more effective and sustainable management by locating the most appropriate culture areas in the system.

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Abstract

Knowledge of diel variations in phytoplankton communities is important to set up and plan a successful and sustainable bivalve aquaculture industry. This study investigated the diel (24-hour cycle) variations in micro-phytoplankton community during two high and two low tides over two alternate days in summer at a barachois-based oyster farm in Mauritius a micro-tidal tropical island. Micro-phytoplankton density and diversity sea surface chlorophyll a concentration and physico-chemical parameters such as sea surface temperature dissolved oxygen pH and salinity were assessed each day during high and low tides at an interval of approximately six hours at 11 stations. Despite the small tidal range significant diel variations in micro-phytoplankton density were noted throughout the tidal cycle. Highest densities of micro-phytoplankton and diversity of diatoms dinoflagellates and cyanobacteria were recorded at stations three and six (S3 and S6). The range of total micro-phytoplankton at S3 and S6 varied above 2.0 x 10� cells L- and for the other stations it varied mainly between 1 to 2 x 10� cells L- throughout all the tides except on the second sampling day where at S1 and S7 the density was slightly above 2 x 10� cells L-. The diatom Coscinodiscus (14 ) the dinoflagellates Peridinium (18 ) and the cyanobacteria Anabaena (24 ) were dominant. S3 and S6 within the barachois having a low flushing rate were characterized by the highest availability of food stock inferring that these stations may sustain an optimal growth of bivalves. These findings may be useful in directing the barachois-based bivalve culture site towards a more effective and sustainable management by locating the most appropriate culture areas in the system.

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Item Type:	Article
AGROVOC Term:	Phytoplankton
AGROVOC Term:	Sampling
AGROVOC Term:	Oyster culture
AGROVOC Term:	Shellfish culture
AGROVOC Term:	Bivalvia
AGROVOC Term:	Tides
AGROVOC Term:	Temperature
AGROVOC Term:	Dissolved oxygen
AGROVOC Term:	Acidity
AGROVOC Term:	Salinity
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9202

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