A new study by biologists at the University of Victoria has revealed why the simple back-and-forth motion of drift logs on B.C. beaches has destroyed critical ecosystems that keep the ocean healthy. … When the tides go out the logs go with them, and when they come in the logs crash onto rocks and beaches. “That intertidal zone … between the high tide and the low tide [supports] a tremendous diversity of life,” said Thomas Reimchen, adjunct professor at the University of Victoria. …The study published in the Marine Ecology journal, found that 20 to 80 per cent fewer barnacles on rocks that were exposed to logs, compared to protected crevices. The fewer the barnacles, the less food there is for species who rely on them. …They found a 520 per cent increase in drift logs since the late 19th century — including on remote shores — with more than half of them from the logging industry.