Glacial retreat has a major influence on coastal ecosystems – it creates ice-free areas which can then be taken over by marine species. However, the process is not always that simple. A recent study published in Polar Biology by D. Deregibus et al. discovered that although newly exposed ice-free areas favor colonization, sediments carried by glacial runoff makes seawater less clear and affects coastal marine species adversely by reducing the survival or reproductive rate. Nonetheless, seaweed in Potter Cove has adapted to shade and can tolerate darkness for a long period as it is accustomed to ice cover blocking sunlight. Increased turbidity, or cloudiness, caused by sediments affects the distribution rather than survival of Antarctic seaweed, Deregibus and his colleagues found.