Abstract
The control of algal blooms caused by a colony of black-headed gulls in an upland loch in central Scotland was attempted using bales of barley straw. The initial evidence suggests that the release of the inhibitory substance commenced 6-10 months after placement of the bales and was sustained for at least 18 months. The moored bales provided a useful substrate for benthic invertebrates, acting as a shelter and detritus trap. Algal diversity appeared not to be affected by the bales, but the cell numbers of the main species were affected.
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