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Didymosphenia geminata mats alter habitat, trophic dynamics and ecosystem function. Prey availability is negatively impacted. Trout populations are not resilient to changing habitat and do not modify their foraging behaviors consequently to promote minimum growth requirements. Drift-foraging salmonids are most likely impacted by didymo blooms than other fish.

Oxygen levels are not depleted and redds are not negatively impacted.

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