Oyster Reef Ecology | On the ReefSeagrasses and Sand Flats In the Grass, On the Reef, A World Away by Randall January 23, 2012 by Randall January 23, 2012 Randall and David have traveled to Australia on visiting research appointments to study habitats like oyster reefs and seagrass beds that are at once familiar, yet quite a bit different and even a little dangerous.