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SU biologist develops method for monitoring shipping noise in dolphin habitat
Date:12/2/2013

A biologist in Syracuse University's College of Arts and Sciences has developed a system of techniques for tracking ships and monitoring underwater noise levels in a protected marine mammal habitat. The techniques are the subject of a groundbreaking article in Marine Pollution Bulletin, focusing on the bottlenose dolphin population in Scotland's Moray Firth.

Nathan Merchant, a postdoctoral researcher in the Department of Biology, co-authored the article with Enrico Pirotta, Tim Barton, and Paul Thompson, of The Institute of Biological and Environmental Sciences at the University of Aberdeen (U.K.).

"Underwater noise levels have been increasing over recent decades, due to escalations in human activity," says Merchant, referring to shipping, pile-driving, and seismic surveys. "These changes in the acoustic environment affect marine mammals because they rely on sound as their primary sensory mode. The disturbance caused by this man-made noise can disrupt crucial activities like hunting for food and communication, affecting the fitness of individual animals."

He adds: "Right now, the million-dollar question is: Does this disturbance lead to changes in population levels of marine mammals? That's what these long-term studies are ultimately trying to find out."

The study focuses on the Moray Firth, the country's largest inlet and home to a population of bottlenose dolphins and various types of seals, porpoises, and whales. This protected habitat also houses construction yards that feed Scotland's ever-expanding offshore wind sector. Projected increases in wind farm construction are expected to bring more shipping through the habitatsomething scientists think could negatively impact on resident marine mammals.

"Different ships emit noise at different levels and frequencies, so it's important to know which types of vessels are crossing the habitats and migration routes of marine mammals," says Merchant, who is based in
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Contact: Rob Enslin
rmenslin@syr.edu
315-443-3403
Syracuse University
Source:Eurekalert

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