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Comparative study of food webs from two different time periods of Hooghly Matla estuarine system, India through network analysis

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  • Rakshit, Nabyendu
  • Banerjee, Arnab
  • Mukherjee, Joyita
  • Chakrabarty, Moitreyee
  • Borrett, Stuart R.
  • Ray, Santanu

Abstract

Two mass-balanced network models of Hooghly Matla estuarine system, from two different time periods (less exploited phase→1985–1990 and highly exploited phase→1998–2003) have been constructed for quantitative comparison. The models are used to estimate the important biological interactions and relationships among different ecologically important groups. 20 functional groups based on species of different habitats from coastal areas in this ecosystem have been identified, including shrimps, squids, crabs, mackerel, small pelagics, demersal fishes, benthic feeders, predator fishes and trash fish. The biomass values for these components are estimated from catch production and bottom trawling surveys. The values of Ecotrophic Efficiency in the models are high (>0.5) for most groups of higher trophic levels. Interactions among different components are clearly understood from the outputs of models with a focus on energy flow. Most fish population are observed to approach high degree of exploitation with change in the overall trophic structure mainly due to top down effects. Several system statistics and network flow indices from the model outputs indicate that this estuary is facing degradation and stress resulting in some degrees of instability.

Suggested Citation

  • Rakshit, Nabyendu & Banerjee, Arnab & Mukherjee, Joyita & Chakrabarty, Moitreyee & Borrett, Stuart R. & Ray, Santanu, 2017. "Comparative study of food webs from two different time periods of Hooghly Matla estuarine system, India through network analysis," Ecological Modelling, Elsevier, vol. 356(C), pages 25-37.
    • Handle: RePEc:eee:ecomod:v:356:y:2017:i:c:p:25-37
    DOI: 10.1016/j.ecolmodel.2017.04.003
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    References listed on IDEAS

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    1. Christensen, V. & Pauly, D. (eds.), 1993. "Trophic models of aquatic ecosystems," Monographs, The WorldFish Center, number 8432, April.
    2. Goerner, Sally J. & Lietaer, Bernard & Ulanowicz, Robert E., 2009. "Quantifying economic sustainability: Implications for free-enterprise theory, policy and practice," Ecological Economics, Elsevier, vol. 69(1), pages 76-81, November.
    3. Ray, Santanu, 2008. "Comparative study of virgin and reclaimed islands of Sundarban mangrove ecosystem through network analysis," Ecological Modelling, Elsevier, vol. 215(1), pages 207-216.
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    1. Borrett, Stuart R. & Sheble, Laura & Moody, James & Anway, Evan C., 2018. "Bibliometric review of ecological network analysis: 2010–2016," Ecological Modelling, Elsevier, vol. 382(C), pages 63-82.
    2. Biswas, Sukdev & Mortoja, Sk Golam & Bera, Ritesh Kumar & Bhattacharya, Sabyasachi, 2024. "Bacteria as ecosystem engineers: Unraveling clues through a novel functional response and tritrophic model," Ecological Modelling, Elsevier, vol. 487(C).

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