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Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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[Ecosystem structure and function of Sanmen Bay based on Ecopath model.]

Ye-Fu Kong1,2, Cheng-Jie Yin3, Lin-Long Wang1,2

  • 1College of Fishery, Ocean University of China, Qingdao 266003, Shandong, China.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|May 7, 2022
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Summary

The Sanmen Bay ecosystem

Keywords:
ecopath modelecosystem attributefood websemi-enclosed baytrophic structure

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Area of Science:

  • Marine Ecology
  • Ecosystem Modeling
  • Coastal Ecosystems

Background:

  • Ecosystem structure is fundamental to material circulation, energy flow, and overall system function.
  • Understanding these processes is crucial for managing and conserving marine environments.
  • Sanmen Bay, a key coastal area in China, requires ecological assessment.

Purpose of the Study:

  • To construct an ecological network model for the Sanmen Bay ecosystem.
  • To describe the energy flow pathways and functional characteristics of this ecosystem.
  • To assess the maturity of material circulation and energy flow in Sanmen Bay.

Main Methods:

  • Utilized field investigation data from Sanmen Bay (2017-2018).
  • Employed the Ecopath software to build an ecological channel model.
  • Analyzed key ecological indices including trophic levels, energy conversion efficiency, connectance index (CI), system omnivory index (SOI), Finn's cycling index (FIC), and mean path length (MPL).

Main Results:

  • The grazing food chain was identified as the primary energy circulation channel.
  • Trophic levels ranged from 1 to 3.80, with energy flow concentrated in the first five levels.
  • Average energy conversion efficiency was 13.0%, with specific efficiencies of 12.8% from primary producers and 14.5% from detritus. Key indices: CI=0.40, SOI=0.24, FIC=0.40, MPL=2.06. Productivity/Respiration ratio was 13.59.

Conclusions:

  • The Sanmen Bay ecosystem exhibits characteristics of immaturity in material circulation and energy flow.
  • The study provides valuable insights into the structural and functional traits of China's coastal ecosystems.
  • Findings can inform ecological management and conservation strategies for similar marine environments.