Shaji, Shini and Sreeram, Miriam Paul and Peariya, Anil and George, Grinson and Ratheesh Kumar, R and Raju, Aju K and Sreekumar, K M and Sreesanth, L and Thobias, P A (2026) Insights on phytoplankton and microzooplankton community changes amidst and in the aftermath of harmful dinoflagellate bloom (Prorocentrum rhathymum) in the coastal waters of Alappuzha, Southwest coast of India. Environmental Monitoring and Assessment, 198. ISSN 1573-2959
Full text not available from this repository. (Request a copy)Abstract
This study delineates the variability in phytoplankton and microzooplankton community composition and abundance during and after the occurrence of harmful Prorocentrum rhathymum (dinoflagellate) bloom encountered in the coastal waters of Alappuzha, southwest coast of India. During bloom phase (August), prolific growth of P. rhathymum was observed in the nearshore stations, especially in S2 (3200 × 103 cells/L) with high Chl a (79.43 mg m−3), which subsequently declined during non-bloom phase (September). The study area exhibited marked variations in phytoplankton and microzooplankton community composition between the bloom and non-bloom phases, characterized by the transition from phytoflagellates to diatoms and from loricates to aloricates, particularly at the nearshore stations. Our findings suggest that the nutrient enrichment, specifically from enhanced levels of ammonium and phosphate due to coastal upwelling, favoured the bloom. Furthermore, the subsequent decline of the bloom was influenced by the top-down control exerted by microzooplankton, especially loricates, in conjunction with pronounced changes in environmental variables.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Harmful algal bloom; Prorocentrum rhathymum; Phytoplankton; Microzooplankton; Alappuzha coastal waters |
| Subjects: | Marine Biology > Phytoplankton Marine Biology > Zooplankton |
| Divisions: | CMFRI-Kochi > Marine Biodiversity, Environment and Management Division Subject Area > CMFRI > CMFRI-Kochi > Marine Biodiversity, Environment and Management Division CMFRI-Kochi > Marine Biodiversity, Environment and Management Division Subject Area > CMFRI-Kochi > Marine Biodiversity, Environment and Management Division |
| Depositing User: | Arun Surendran |
| Date Deposited: | 25 Jan 2026 13:32 |
| Last Modified: | 25 Jan 2026 13:32 |
| URI: | http://eprints.cmfri.org.in/id/eprint/19516 |
Actions (login required)
 |
View Item |
