Golf courses can cause biomagnification because if you´ve read the pond page, youe read that these toxins from the artificial material can be consumed by organisms living in the environment. Organisms that eat these organisms can consume these toxins as well and the toxins continue through the food chain
source: https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Bio-magnification_in_a_pond_ecosystem.svg/220px-Bio-magnification_in_a_pond_ecosystem.svg.png