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Zooplankton dynamics in a highly eutrophic microtidal estuary.

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Eutrophication in estuaries disrupts zooplankton communities, decreasing copepods and increasing algae-associated species. Nocturnal sampling and salinity changes significantly impact estuarine zooplankton composition and abundance.

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Area of Science:

  • Estuarine Ecology
  • Marine Biology
  • Environmental Science

Background:

  • Microtidal estuaries like Peel-Harvey are susceptible to eutrophication, leading to macroalgal blooms and cyanobacterial proliferation.
  • Eutrophication significantly alters estuarine food webs, impacting zooplankton communities.
  • Understanding zooplankton dynamics is crucial for assessing estuarine health.

Purpose of the Study:

  • To investigate the seasonal variations in mesozooplankton communities within a microtidal estuary experiencing eutrophication.
  • To compare the Peel-Harvey estuary's zooplankton with other estuarine systems to identify impacts of eutrophication.
  • To determine the influence of environmental factors like salinity, light, and oxygen on zooplankton composition and abundance.

Main Methods:

  • Seasonal sampling of mesozooplankton in the Peel-Harvey estuary.
  • Comparative analysis with data from other estuaries to assess eutrophication effects.
  • Analysis of species composition, abundance, and diversity indices (e.g., Simpson's Index).
  • Correlation of zooplankton data with environmental parameters including salinity, oxygen, and time of day.

Main Results:

  • Eutrophication correlated with decreased copepod abundance and increased macroalgal-associated species.
  • Mesozooplankton communities were predominantly autochthonous and tychoplanktonic, with few meroplanktonic or abundant holoplanktonic species.
  • Species number, concentration, and diversity were higher during nighttime sampling.
  • Annual species composition changes were strongly linked to salinity fluctuations.
  • Highly degraded sites showed high nematode concentrations and disrupted annual cycles due to low oxygen levels.

Conclusions:

  • Eutrophication profoundly reshapes estuarine mesozooplankton by favoring opportunistic, algae-associated species over native copepods.
  • The dominance of tychoplanktonic species highlights the physical disturbance of sediments in this estuary.
  • Diurnal and salinity variations are key drivers of estuarine zooplankton dynamics, with severe eutrophication disrupting these patterns.