Riffle beetles in the family Elmidae are frequent members of the invertebrate community of running water and are found all around the world. Most elmid species occur in well-aerated streams and rivers. They are often found on stones and particulate debris. Both larvae and adults are fully-aquatic, getting oxygen from the water around them.
Riffle beetles appear to be collector-gatherers and scrapers that feed chiefly on algae and detritus. Riffle beetles, both adults and larvae, are rarely eaten by other invertebrates but are eaten by fish, especially salmonids.
Human threats to the survival of riffle beetles include reduced dissolved oxygen, elevation of water temperature, extremes of flow, pollution, and soaps and detergents. Therefore, riffle beetles are a good indicator of water quality.
|