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<p>The present study evaluates the impact of oceanographic factors on the distribution and abundance of two pollution indicator species, such as <i>Nitzchsia palea</i> and <i>Melosira varians</i>, in Manori Creek using the GAM model. The <i>Nitzchsia palea</i> during high tide has an AIC value of 1233.91; deviance is explained by 29% with a<i> p</i>-value of 0.0498*, whereas during low tide, it has an AIC value of 1083.957; deviance is defined by 25.2% with a<i> p</i>-value of 0.1628*. The <i>Melosira varians</i> during high tide have an AIC value of 1155.501; deviance is explained by 30.5% with a<i> p</i>-value of .0069**, whereas during low tide, they have an AIC value of 1089.51; deviance is defined by 31.9% with a<i> p</i>-value of 0.0294*. These species are dominant during more nutrient-loaded, alkaline conditions and can also tolerate lower dissolved oxygen. The dominance of these two species revealed that the water quality of the creek is deteriorating due to pollution.</p>

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Pollution Indicator Phytoplankton in a Tropical Creek: Ecological Insights from Generalized Additive Model (GAM) Analysis

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • M. Dhanalakshmi,
  • Sahina Akter,
  • Geetanjali Deshmukhe,
  • Asha T. Langde,
  • Shashi Bhushan,
  • Shiv Kumar,
  • Rinkesh N. Wanjari,
  • B. B. Nayak

摘要

The present study evaluates the impact of oceanographic factors on the distribution and abundance of two pollution indicator species, such as Nitzchsia palea and Melosira varians, in Manori Creek using the GAM model. The Nitzchsia palea during high tide has an AIC value of 1233.91; deviance is explained by 29% with a p-value of 0.0498*, whereas during low tide, it has an AIC value of 1083.957; deviance is defined by 25.2% with a p-value of 0.1628*. The Melosira varians during high tide have an AIC value of 1155.501; deviance is explained by 30.5% with a p-value of .0069**, whereas during low tide, they have an AIC value of 1089.51; deviance is defined by 31.9% with a p-value of 0.0294*. These species are dominant during more nutrient-loaded, alkaline conditions and can also tolerate lower dissolved oxygen. The dominance of these two species revealed that the water quality of the creek is deteriorating due to pollution.