Urban ponds are rapidly gaining importance as nature-based solutions to manage climate-related hydrologic risks, while promoting biodiversity and human well-being in cities. The ecosystem services of ponds strongly depend on water level dynamics, water quality, and biota. Urban stressors, particularly chemical pollution, can lead to negative ecological conditions that disrupt ecosystem functioning and lead, for instance, to harmful algal blooms. Water fleas of the genus Daphnia are key players in pond ecosystems that control algal development through grazing. Daphnia can adapt to urban stressors through evolution and potentially also by incorporating locally adapted microbial communities into their gut microbiome. We hypothesize that evolutionary or microbiome-mediated adaptation of Daphnia to urban pollution results in enhanced resilience of pond ecosystems against urban disturbances.
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