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<p>Copepods of an inter-tidal beach (ITB) and a creek of a single estuary are less compared. Copepods of the Chemaguri Creek (CC) and an ITB of Sagar Island, Ganges estuary (GE) were sampled seasonally from February 2021 to October 2022. It was hypothesized that the community structures (i.e., diversity, abundance and dominance) were different between habitats, and the CC hosted higher diversity and abundance of copepods than the ITB. Seasonal variabilities of the salinity (range CC: 7.0 to 20.40; ITB: 9.50 to 22.90) and water temperature (range CC: 21.40 to 32.60&#xa0;°C; ITB: 19.70 to 31.90&#xa0;°C) were significant for both the habitats. Total Nitrogen levels (range: 71.86 to 87.26 µmol.L<sup>− 1</sup>) varied significant among seasons only in the ITB. Calanoid copepods of the Paracalanidae and Acartiidae families dominated both the habitats. Species richness and cumulative abundances of the copepods were higher in the CC than ITB possibly because the latter is exposed to wave dashing whereas the CC provides a sheltered environment. Dissimilarity of the copepod community of the CC and ITB was 30.54%, majorly contributed by the Cyclopoids and Harpacticoids. The ITB had more Harpacticoids than the CC which had more Cyclopoids than the previous. <i>Acartiella tortaniformis</i> and <i>Acartia spinicauda</i> dominated the CC and the ITB, respectively. Small to medium size copepods were more frequent in both the habitats than large copepods. Micro-habitats within a habitat did limit the ecology of the copepods in the Sagar Island, GE; therefore, seasonality and habitat specificity shall be considered if copepods are used for water quality monitoring of a river-estuary.</p>

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Copepods of a creek and an inter-tidal beach: perspectives from Sagar Island of Ganges estuary, India

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Sourav Paul

摘要

Copepods of an inter-tidal beach (ITB) and a creek of a single estuary are less compared. Copepods of the Chemaguri Creek (CC) and an ITB of Sagar Island, Ganges estuary (GE) were sampled seasonally from February 2021 to October 2022. It was hypothesized that the community structures (i.e., diversity, abundance and dominance) were different between habitats, and the CC hosted higher diversity and abundance of copepods than the ITB. Seasonal variabilities of the salinity (range CC: 7.0 to 20.40; ITB: 9.50 to 22.90) and water temperature (range CC: 21.40 to 32.60 °C; ITB: 19.70 to 31.90 °C) were significant for both the habitats. Total Nitrogen levels (range: 71.86 to 87.26 µmol.L− 1) varied significant among seasons only in the ITB. Calanoid copepods of the Paracalanidae and Acartiidae families dominated both the habitats. Species richness and cumulative abundances of the copepods were higher in the CC than ITB possibly because the latter is exposed to wave dashing whereas the CC provides a sheltered environment. Dissimilarity of the copepod community of the CC and ITB was 30.54%, majorly contributed by the Cyclopoids and Harpacticoids. The ITB had more Harpacticoids than the CC which had more Cyclopoids than the previous. Acartiella tortaniformis and Acartia spinicauda dominated the CC and the ITB, respectively. Small to medium size copepods were more frequent in both the habitats than large copepods. Micro-habitats within a habitat did limit the ecology of the copepods in the Sagar Island, GE; therefore, seasonality and habitat specificity shall be considered if copepods are used for water quality monitoring of a river-estuary.