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Summary

Harbours are well known hot spots for pollutants ranging from heavy metals to an assortment of organic pollutants including antifouling substances. This study was aimed at investigating whether these hot spots cause changes in macroalgae community structure, and if so, identify which algae are affected. Six harbours and six reference locations in Denmark were investigated. Care was taken to ensure that the reference area for each harbour had the same conditions with respect to physical disturbances, salinity, nutrient and light conditions. Macroalgae were determined to species or group, and the level of coverage for each species/group was visually judged, along with total biomass of macroalgae from each site. TBT in mussels from harbours and reference areas were used as an indicator of pollutant level. Similarity analysis showed that community composition in harbours was different from the reference area at all six locations. A large part of the difference between harbours and references was in all cases due to reduced cover of crust forming algae at the harbour sites with high TBT levels. The results also showed lower total biomass in harbour areas. Results from this screening project suggest that contaminants from harbours can effect macroalgae community composition.

Full report in pdf. format (714 KB)
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Helle Thomsen

01.11.2007


DMU  | dmu@dmu.dk  

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 CVR: 10859387

 EAN: 5798000867000