A DOLPHIN TALE
This article originally appeared in the 2015 edition of ARISING: The Research Journal of Savannah State University
When a dolphin washed ashore on Tybee Island in early February, it could have been another heart-wrenching tale of an animal meeting a tragic end. But thanks to Savannah State University’s Marine Mammal Program, the death of the bottlenose dolphin known as Phineas will become a teachable moment.
Led by
Tara Cox, Ph.D., an associate professor of marine sciences, the Savannah State Marine Mammal Program had been tracking Phineas since 2009. The program is funded through several grants at the university, including the Title VII, National Science Foundation Enhancing Diversity in Geoscience Education (EDGE), Bridge to Research in Marine Sciences Research for Undergraduates (REU) and Students Engaged in Naval STEM Research (SENSR) programs, among others.
Eleven undergraduate and three graduate students from the various grant programs currently serve as interns in the Marine Mammal Program. The students assist faculty with tracking the local dolphin population in Savannah-area waterways, then map their results back in the SSU Dolphin Sciences Lab.
Student interns in SSU’s Marine Mammal Program spend time on the water and in the lab. (Clockwise from top) Cody Rigney, a junior marine sciences major, studies distribution of dolphins. Associate Professor of Marine Sciences Tara Cox, Ph.D., is director of the Marine Mammal Program. Rachael Randall, a graduate student in marine sciences, spends time in the lab analyzing dolphin blubber for stable isotope ratios. Cassandra Harris, a sophomore marine sciences major, is working to reassess human interaction rates of bottlenose dolphins.
The SSU Marine Mammal team had spotted Phineas at least 16 times over the past five years, tracking the adventurous mammal as he swam around Tybee Island and up and down the Bull River. Beachgoers found Phineas’ body on Tybee’s north beach and contacted local authorities. The
Georgia Department of Natural Resources was called in and performed the necropsy with assistance from SSU students and staff. The DNR then shared the deceased dolphin’s picture to its local stranding network, of which Savannah State is a part.
“When they did the necropsy, the dorsal fin was in really good shape,” explains Cox. “We identify animals by unique patterns of nicks and notches on their dorsal fins. My lab manager
Robin Perrtree immediately recognized that it was one of our animals.”
Cox hopes that the lab results from Phineas’ necropsy will shed some light on why the dolphin was so emaciated and sickly when he washed ashore. The samples taken during the necropsy are currently being tested for a variety of illnesses including brucellosis, a bacterial infection, and morbillivirus, an illness similar to the human form of measles.
While disease may have been the cause of Phineas’ death, other dolphins in the area face challenges brought on by humans. Through their research, Cox and her team have discovered that the Savannah area has the world’s worst begging problem.
“We see dolphins begging about two-thirds of our days on the water and about a quarter of our sightings,” explains Cox, who developed five metrics to compare dolphins in the Savannah area to those in other dolphin hotspots around the world.
Begging poses a danger to dolphins, which are at risk for injury when they swim so closely to boats. The human snacks that boaters often feed dolphins can also harm the popular mammals.
Cassandra Harris, a sophomore marine sciences major from Stone Mountain, Ga., is currently working in the Marine Mammal Program to reassess human interaction with the local bottlenose dolphin population, updating research that was conducted by Perrtree over the last several years. Harris, who has been intrigued by dolphins since she visited Sea World as a child, is chronicling the number of begging events per sighting and per day, as well as the number of human interactions per sighting and per day.
Harris’ research will help Cox and her team understand the extent of dolphin-human interaction in the area. “My ultimate goal is to affect policy with our science,” says Cox, explaining that members of the
National Oceanic and Atmospheric Administration (NOAA) came to Savannah a few years ago to observe the waterways and conduct outreach. Cox and her team also regularly visit schools and talk to local fishermen in hopes of discouraging people from feeding dolphins.
“It looks like there has been a slow decline [in begging],” Cox says. “It’s hard to say why, but we’re getting news articles out, we’re doing outreach and there’s been some enforcement. That may be making a difference.”
Harris’ research will be presented at a conference this spring and will be an important step in addressing and understanding the issues facing the local population, something that will help protect dolphins like Phineas for years to come.
