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Quantifying Fish Swimming Behavior in Response to Acute Exposure of Aqueous Copper Using Computer Assisted Video and Digital Image Analysis

Quantifying Fish Swimming Behavior in Response to Acute Exposure of Aqueous Copper Using Computer Assisted Video and Digital Image Analysis

Published on: February 26, 2016

Planktonic microbial community responses to added copper.

Anne-Hélène Le Jeune¹, Marie Charpin, Denis Sargos

¹UMR CNRS 6023, Laboratoire de Biologie des Protistes, Université Clermont-Ferrand II, 24, avenue des Landais, 63177 Aubière Cedex, France.

Aquatic Toxicology (Amsterdam, Netherlands)

|June 22, 2007

Summary

Copper sulphate significantly impacts aquatic microbial loops, reducing pigmented organisms and ciliates while promoting heterotrophic bacteria. Spring communities were more sensitive than summer ones.

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Area of Science:

Aquatic Ecology
Environmental Toxicology

Background:

Copper is known to harm phytoplankton but its effects on the broader microbial loop are understudied.
The microbial loop, comprising various planktonic organisms, plays a crucial role in aquatic ecosystems.

Purpose of the Study:

To investigate the direct and indirect effects of copper sulphate on natural microbial loop communities.
To assess copper's impact on non-target organisms at concentrations used for cyanobacteria control.

Main Methods:

Indoor experiments using natural microbial communities sampled in spring and summer.
Exposure to two copper sulphate concentrations (80 µg/L and 160 µg/L).
Analysis of biomass and diversity of various microbial groups.

Main Results:

Significant decrease in biomass and diversity of pigmented organisms (picophytoplankton, flagellates).
No direct impact on heterotrophic bacterioplankton or flagellates' biomass/diversity.
Reduced ciliate biomass, with higher sensitivity in spring communities and mixotrophic/nanoplanktorivorous types.
Restructuring of microbial communities, leading to heterotrophic bacterioplankton dominance.

Conclusions:

Copper sulphate significantly alters microbial loop structure, with varying sensitivity between seasons and microbial groups.
The study highlights the broader ecological impact of copper beyond phytoplankton.
Heterotrophic bacterioplankton can become dominant following copper treatment.