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Related Experiment Video

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Hexabromocyclododecane affects benthic-pelagic coupling in an experimental ecosystem.

Clare Bradshaw¹, Johan Näslund², Joakim Hansen²

¹School of Natural Sciences, Technology and Environmental Studies, Södertörn University, 14189 Huddinge, Sweden.

Environmental Pollution (Barking, Essex : 1987)

|July 29, 2015

Summary

This study examined Hexabromocyclododecane (HBCDD) impacts on Baltic Sea coastal ecosystems. Elevated HBCDD levels harmed species and altered nutrient cycling, demonstrating significant ecosystem-level effects.

Keywords:

Baltic sea Brominated flame retardants HBCDD Indirect ecosystem effects Mesocosm study Structural equation modelling

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Area of Science:

Environmental toxicology
Marine ecology
Ecosystem science

Background:

Hexabromocyclododecane (HBCDD) is a persistent, bioaccumulative, and toxic (PBT) flame retardant.
Limited data exists on HBCDD's effects on coastal species and ecosystems.

Purpose of the Study:

To investigate the dose-response effects of HBCDD on a coastal Baltic Sea ecosystem.
To understand the structural and functional consequences of HBCDD exposure.

Main Methods:

Utilized 1000 L experimental mesocosms with Baltic Sea ecosystem components.
Exposed mesocosms to HBCDD via spiked plankton over 8 months.
Measured various structural and functional endpoints.

Main Results:

Increased HBCDD concentrations reduced the biomass of Macoma balthica.
This biomass reduction led to decreased nutrient recirculation.
Plankton communities were altered by direct toxicity or indirect effects on nutrient cycling.

Conclusions:

HBCDD exposure significantly impacts coastal ecosystem structure and function.
Realistic experimental setups are crucial for understanding complex ecosystem responses.
This is the first study to assess HBCDD's ecosystem-level effects.