Dolphin Distribution & Abundance
TCBDP researchers are currently studying common bottlenose dolphin abundance and distribution in the Texas Coastal Bend as there has not been published research on the population of bottlenose dolphins in the TCB since 1983 and 1994. Since then, Corpus Christi and the surrounding area has experienced a dramatic expansion in industrial growth. Therefore, it is vital to monitor the abundance of dolphins to gain an understanding of their population stability.
Photo Credits: FABEMM Lab, NMFS permit no. 23203
How do we study dolphin abundance in the TCB?
The population abundance of dolphins inhabiting the TCB is determined by counting the number of individuals using photo identification. Individual dolphins are distinguished by unique markings on their dorsal fins. Similar to a human fingerprint, these unique markings can help researchers tell dolphins apart from one another.
To collect these photos, TCBDP researchers go on boat-based photo-ID surveys. On these surveys, TCBDP researchers use large, high-quality cameras to capture images of the right and left sides of the dolphin's dorsal fin. A variety of data (GPS coordinates, group behaviors, and environmental data) is also recorded. Once photographs are collected, they are quality control checked, cropped to focus on the dorsal fin, and then matched by a minimum of 2 researchers. Identified individuals are then added to a master catalog which stores the individuals with their photos, sighting data, and more.
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This population abundance study is vital for setting baseline data for future research on this population. It is difficult to compare population growth or device based on past research as our research design is drastically different than previous research. The master catalog created in this study can be used for a variety of future research projects. Using these photographs, we can track individual movements, associations, and a variety of other factors that will help us better understand the health of this population.
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