Plants- From Wildflowers to Longleaf PineSalt Marsh Ecology | In the Grass Black Mangroves: Strangers in a St. Joe Bay Marsh by Randall August 8, 2013 by Randall August 8, 2013 Could marshes in St. Joseph Bay be changing? Dr. Randall Hughes investigates the increasing black mangrove population of the SJB salt marsh.