Linked from
The 14 pages that link to Aquatic ecosystem, each with the reason it gives.
AlkalinityRelated: Alkalinity helps determine how strongly lakes and streams resist acidification.
Freshwater habitatNarrower topic: Freshwater habitats are one major setting for aquatic ecosystems.
StreamflowRelated: Flow controls habitat conditions, connectivity, and resource delivery.
Gold dredgeRelated: Dredging disturbs habitat, sediment, and water conditions in stream ecosystems.