Larva of a leaf beetle

6501.  There were several hundred of these larvae found at our local swimming/paddling lake, crawling up the pathway and inside the boathouse. Noticed in July during a short heatwave of 30 degrees (could be coincidence). They seem to be attracted to wood, and possibly water. Any idea what these are? Are they invasive or harmful to our ecosystem? If so is there any way to eradicate? Pemberton, BC. Canada

Number 6501.  This is a larva of a leaf beetle (Coleoptera: Chrysomelidae); they likely had been feeding on shrubs or trees in that area.