Water Quality is measured annually in both streams and lakes in Gwaii Haanas. Many water quality parameters are collected and they can be grouped into three categories: (1) Physical (e.g. temperature, depth); (2) Chemical (e.g. pH, nutrients) and (3) Biological (chlorophyll a). Water quality is a key component of aquatic habitat and changes to any parameters can be caused by the surrounding landscape, climate, in-stream processes, and natural and human impacts. Depending on the parameter, significant changes can impact biota from algae to fish and birds. This data is also posted to, and available from ECCC's CABIN database.