Another study investigates differing concentrations of brevetoxin in different organs between avian, cetacean, and sirenian species, specifically a cormorant, bottlenose dolphin, and the Florida manatee. These organs include the liver, kidneys, brain, lungs, and stomach contents of all of these animals, and compared them to see where in the food web they were exposed, and to what extent. Manatees had the highest concentrations of brevetoxin in their livers, dolphins in their stomach contents, and cormorants in their brain and lungs. The kidney analysis showed that manatees and cormorants had equally high levels. Over all animals, the concentrations were highest in the liver, then kidneys, then lungs, and finally the brain, perhaps indicating a pathway for metabolizing brevetoxin. Dolphins in this study did not show much tissue damage compared to the other two, indicating that brevetoxin has a more profound lethal impact at lower concentrations. Some symptoms of brevetoxicosis on the central nervous system include behavioral changes, muscular impairments, and disorientation. In manatees this is expressed in difficulty breathing difficulties, balance issues, and flexing of the back. In cormorants, they demonstrate difficulties flying. Another study showed that lemon sharks have similar issues with disorientation associated with brevetoxin exposure. In addition to brevetoxicosis, manatees also have impaired immune system function, making them unable to fight off the exposure and more susceptible to other diseases. This happens due to decreased lymphocyte response to exposure and inflammation in the affected areas, this study was done on sublethal exposed manatees.