title: Extensive Chaetoceros curvisetus bloom in relation to water quality in Port Blair Bay, Andaman Islands.
abstract: Blooming of diatom species Chaetoceros curvisetus (Cleve, 1889) was observed in Junglighat Bay and Haddo Harbour of Port Blair Bay of Andaman and Nicobar Islands during June 2010. Physico-chemical parameters, nutrient concentrations and phytoplankton composition data collected from five stations during 2010 were classified as bloom area (BA) and non-bloom area (NBA) and compared. Elevated values of dissolved oxygen were recorded in the BA, and it significantly varied (p < 0.01) from NBA. Among the nutrient parameters studied, nitrate concentration indicated significant variation in BA and NBA (p < 0.01). Phosphate and ammonia concentrations reduced to below detection level (BDL) in the BA and NBA, indicating its utilization. In Junglighat Bay, the C. curvisetus species constituted 93.4 and 69.2% composition of total phytoplankton population during day 1 and day 2, respectively. The bloom forming stations separated out from the non-bloom forming station in non-parametric multidimensional scaling (nMDS) ordinations; cluster analysis powered by SIMPROF test also grouped the stations as BA and NBA.
authors.affiliation: Andaman and Nicobar Centre for Ocean Science and Technology, National Institute of Ocean Technology, Port Blair, 744103, India, mehmuna@gmail.com.
authors.forename: Mehmuna
authors.initials: M
authors.lastname: Begum
authors.forename: Biraja Kumar
authors.initials: BK
authors.lastname: Sahu
authors.forename: Apurba Kumar
authors.initials: AK
authors.lastname: Das
authors.forename: Nambali Valsalan
authors.initials: NV
authors.lastname: Vinithkumar
authors.forename: Ramalingam
authors.initials: R
authors.lastname: Kirubagaran
mesh_terms: D061006:Bays; D016000:Cluster Analysis; D017377:Diatoms / Q000254:growth & development*; D004784:Environmental Monitoring; D062312:Islands; D009566:Nitrates / Q000032:analysis; D010839:Phytoplankton / Q000254:growth & development*; D014876:Water Pollution / Q000032:analysis / Q000706:statistics & numerical data*; D060753:Water Quality
chemical_list: D009566:Nitrates
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