LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Diatom bloom in the Amba River, west coast of India: A nutrient-enriched tropical river-fed estuary

Photo from wikipedia

Abstract The role of allochthonous nutrient inputs in governing phytoplankton distribution and abundance were assessed from the estuarine regions of the Amba River, west coast of India. A total of… Click to show full abstract

Abstract The role of allochthonous nutrient inputs in governing phytoplankton distribution and abundance were assessed from the estuarine regions of the Amba River, west coast of India. A total of 35 species belonging to 24 genera were recorded, where the diatom Coscinodiscus oculus-iridis (99%) dominated the estuarine mouth with a density of 3.5 × 105 cells l−1. Community analyses indicate that diversity (H’) decreased towards the estuarine mouth (0.002 ± 0.001) compared to the middle (0.38 ± 0.06) and inner estuary (1.83 ± 0.14) due to the diatom outbreak. Chlorophyll a reached an average of 12.51 μ g l−1 at the estuarine mouth, which is over three times the value determined in the middle estuary (4.25 μ g l−1). The key sources of these land-based nutrients are identified as agricultural land and urban runoff for nitrogen (N) and phosphorus (P), extensive sand mining for silica (Si) and aeolian deposition of iron minerals from industrial conveyor belts. A linear correlation between cell density and chlorophyll a with chemical variables indicated that silicate coupled with excess nitrogen input was crucial causative factors for the bloom. The nutrient enrichment towards the estuarine mouth is due to the dispersal of these land derived nutrients by complex hydrological forces.

Keywords: estuarine mouth; coast india; river west; river; west coast; amba river

Journal Title: Regional Studies in Marine Science
Year Published: 2020

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.