South Florida beaches faced a sargassum assault this summer that some scientists believe is part of the largest spread of the nomadic marine weed on record, and one that could continue through September.

Heavy mats of seaweed are washing up on South Florida beaches, creating thick barriers to the ocean.

Cold temperatures have started the Fall of the Iguanas and the immobilization of sea turtles, whose bodies have a hard time adjusting to the change in water temperature.