Ocean Lecture Series

A Synopsis of Dolphin Photo-identification Research in the Indian River Lagoon
Marilyn Mazzoil

About the Lecture

Harbor Branch initiated a database of Indian River Lagoon (IRL) dolphins in 1998, using photo-identification methods (dolphins can be identified by unique notches on the dorsal fin). Photographic surveys are used to determine population abundance, distribution, occurrence, social organization, and to monitor life history. The goal is to understand the stock structure of dolphins distributed along Florida’s east coast. These data will help NOAA's National Marine Fisheries Service to separate resident dolphins found in estuaries from coastal Atlantic populations for management and conservation purposes.

As top predators, IRL dolphins serve as a sentinel species for ocean and human health. Thus, data from population studies, life history, and health assessments all serve as useful tools for resource mangers to create predictive models and validate present environmental strategies. EPA's National Estuary Program (NEP), the Comprehensive Everglades Restoration Plan (CERP), and others charged with improving water quality in the IRL, can make practical use of these data. Longitudinal trends in dolphin home ranges and health status will be used to measure the results of restoration efforts, and track the results of reducing pollutants and restoring water quality in the IRL. In this way, dolphins play an integral role in mankind’s stewardship of the irreplaceable and valued resources of the IRL.

About the Speaker

Marilyn Mazzoil's first experience with marine mammals began in 1987 as a killer whale trainer. Since that time, she has dedicated her career to wildlife studies with an emphasis on dolphins inhabiting the Indian River Lagoon. In 1997, Marilyn joined Harbor Branch, established the Marine Mammal Research and Conservation program with Steve McCulloch, and worked to build programs that support multi-faceted scientific and conservation initiatives.

In order to fund such initiatives, Marilyn and Steve helped to pass two Florida State Laws, creating top-selling specialty license plates that support research, conservation, and education activities throughout the state: Protect Wild Dolphins and Protect Florida Whales. She also helped develop a stranding/rescue program that has responded to more than 175 sick or injured dolphins and whales since 1999. As a scientific investigator, Marilyn helped create and continues to conduct photo-identification surveys, which cover 40% of Florida's east coast, to assess the distribution and abundance of dolphins.

Marilyn is a Research Associate in the Center for Marine Ecosystem Health. Her lab currently focuses on dolphin fitness using photo-identification to monitor reproductive success and survival, in combination with Harbor Branch's ongoing molecular genetic (Dr. Greg O'Corry-Crowe) and health (Dr. Greg Bossart) studies.