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<p>The present study investigates the effects of environmental conditions on diatom assemblage dynamics in the Mandovi estuary, Goa, India. Surface water samples collected from 18 stations revealed a broad salinity range (0–31) and distinct nutrient distributions, with high nitrate concentrations in the upper region and elevated silicate and phosphate in the lower region. A total of 116 diatom species (73 pennate, 43 centric) were identified, exhibiting clear spatial zonation. Species richness was highest in the upper region, while the middle region showed higher diversity and the lower region featured high abundance. The lower region of the estuary was dominated by <i>Pseudo-nitzschia</i> spp., which are potential producers of the neurotoxin, domoic acid. <i>Coscinodiscus</i> sp., <i>Navicula</i> sp., and <i>Cylindrotheca closterium</i> were the euryhaline species, whereas <i>Rhoicospenia</i> sp., <i>Rhizosolenia</i> sp., <i>Proboscia</i> sp., and <i>Guinardia</i> sp. were the stenohaline species. Canonical Correspondence Analysis demonstrated that salinity, pH, dissolved oxygen, nitrate, phosphate, silicate, and temperature significantly influenced diatom assemblage structure. These findings highlight the integral role of physical and chemical factors in regulating phytoplankton assemblages, contributing to a broader understanding of tropical monsoon-influenced estuarine ecosystem functioning.</p>

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Environmental Drivers of Diatom Assemblage Composition in a Tropical Estuary: a Multivariate Approach

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Komal R. Patil,
  • Samir Damare,
  • Smita Mitbavkar

摘要

The present study investigates the effects of environmental conditions on diatom assemblage dynamics in the Mandovi estuary, Goa, India. Surface water samples collected from 18 stations revealed a broad salinity range (0–31) and distinct nutrient distributions, with high nitrate concentrations in the upper region and elevated silicate and phosphate in the lower region. A total of 116 diatom species (73 pennate, 43 centric) were identified, exhibiting clear spatial zonation. Species richness was highest in the upper region, while the middle region showed higher diversity and the lower region featured high abundance. The lower region of the estuary was dominated by Pseudo-nitzschia spp., which are potential producers of the neurotoxin, domoic acid. Coscinodiscus sp., Navicula sp., and Cylindrotheca closterium were the euryhaline species, whereas Rhoicospenia sp., Rhizosolenia sp., Proboscia sp., and Guinardia sp. were the stenohaline species. Canonical Correspondence Analysis demonstrated that salinity, pH, dissolved oxygen, nitrate, phosphate, silicate, and temperature significantly influenced diatom assemblage structure. These findings highlight the integral role of physical and chemical factors in regulating phytoplankton assemblages, contributing to a broader understanding of tropical monsoon-influenced estuarine ecosystem functioning.