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Furthermore, because of the hydraulic connectivity between groundwater and surface waters, where this occurs, groundwater pollution problems may propagate to surface water pollution (e.g. eutrophication; toxic substances/solutions). In addition, the drawdown of the groundwater tables can cause lower inflows to associated streams and lakes, and in extreme cases complete dry-out. Lower flows or stagnation of associated surface waters increases the occurrences of water quality problems. Both quantity and quality issues, as well as their combination, result in ecological problems in surface waters. The ecological functions of individual species of flora and fauna, as well as ecological processes in aquatic and terrestrial ecosystems (e.g. wetlands, estuaries, riparian zones), can be altered or disrupted, leading to the decline of species populations and the degradation of biodiversity.