Rambo Tribble writes: Adding to the well-known fish-killing effects deforestation has in increasing turbidity and temperature in streams, a study published in Nature Communications, (abstract, PDF access), demonstrates deforestation causes a depletion of nutrients in associated lake aquatic ecosystems and, as a consequence, impacted fish stocks. Lead author Andrew Tanentzap is quoted as saying, 'We found fish that had almost 70% of their biomass made from carbon that came from trees and leaves instead of aquatic food chain sources.' This has troubling implications as, 'It's estimated that freshwater fishes make up more than 6% of the world's annual animal protein supplies for humans
...' Additionally, this may have significance in regard to anadromous species, such as salmon, which help power ocean ecosystems. The BBC offers more approachable coverage.