samples taken from pump sumps. Dissolved oxygen, temperature,
salinity, and ORP were measured continuously with calibrated
probes (Point Four Systems, Coquitlam, BC, Canada). Total
ammonia, nitrite, nitrate nitrogen, alkalinity, and CO2 were
measured using chemical reagents (Hach Chemical, Loveland,
CO) and Hach DR850 spectrophotometer and pH meters.