The resultant marked increase in opacity of the pondwater's surface doesn't seem to bother dabbling fowl like ducks, whose omnivorous eating is targeted primarily at vegetable matter. Night herons, on the other hand, eat a diet of various small creatures, aquatic and terrestrial, ambushing them while standing near the edge of the water. I presume that a dense cover of duckweed would complicate attempts by Phil (as well as his colleagues, although he tends to hunt alone) to grab a meal of small fish (fries or minnows), if he was so motivated.
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