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Dolphins Are Picky When It Comes To Choosing Friends

Intensive photo-ID surveys conducted along the IRL, which were carried out over a six- and-a-half year period, the researchers were able to learn about the association patterns as well as movement behavior and habitat preferences of some 200 individual dolphins.

Dolphins Are Picky When It Comes To Choosing Friends.

Dolphins / Flickr

Dolphins / Flickr

 

In a paper published recently in the journal Marine Mammal Science, the team found that individual dolphins exhibited both preference and avoidance behavior – so just like humans, they have dolphins they like and associate with and ones they avoid. The study also found that IRL dolphins clustered into groups of associated animals, or “communities,” that tended to occupy discrete core areas along the north-south axis of the lagoon system.

“One of the more unique aspects of our study was the discovery that the physical dimensions of the habitat, the long, narrow lagoon system itself, influenced the spatial and temporal dynamics of dolphin association patterns,” said Elizabeth Murdoch Titcomb, research biologist at HBOI who worked on the study with Greg O’Corry-Crowe, Ph.D., associate research professor at HBOI; Marilyn Mazzoil, senior research associate at HBOI, and Elizabeth Hartel. “For example, communities that occupy the narrowest stretches of the Indian River Lagoon have the most compact social networks, similar to humans who live in small towns and have fewer people with whom to interact.”

In addition to providing a unique glimpse into dolphin societies, this novel study provides important insight and knowledge on how dolphins organize themselves, who they interact with and who they avoid, as well as when and where. It also gives scientists and resource managers the roadmap needed to understand how dolphin populations perceive and use their environment, and how social networks will influence information transfer and potentially breeding behavior and disease transmission.

The IRL is a 156-mile long estuary located on Florida’s east coast. The lagoon is long and narrow and composed of three distinct water bodies; Mosquito Lagoon, Banana River, and the Indian River. There are five inlets and one lock (Cape Canaveral lock) connecting the IRL to the Atlantic Ocean. The estuary ranges in width from a few meters to 9 kilometers and averages in depth at approximately 1.5 meters with maximum depths at around 4 meters. In 1990, the United States Environmental Protection Agency designated the IRL as an “Estuary of National Significance” to help preserve one of the most biodiverse estuaries in North America. Researchers from HBOI have been conducting photo identification studies of IRL bottlenose dolphins since 1996, identifying more than 1,700 individual dolphins. Among the findings enabled by this data is identification of a distinct IRL stock now breeding its third generation since the study began, and insights into breeding and social behavior.

Dolphins Are Picky When It Comes To Choosing Friends.

 

About Jordanna

From San Diego, California. "Good news is rare these days, and every glittering ounce of it should be cherished and hoarded and worshiped and fondled like a priceless diamond." -Hunter S. Thompson

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