Hot Topic Scientists Measure Ambient Noise Levels in One of the Deepest Parts of the Global Ocean The ocean is filled with sound. Sound levels in the ocean differ from location to location and change with time. Some sounds are present more or less everywhere in the ocean all of the time. Some [...]
The National Marine Fisheries Service (NMFS) is the U.S. federal agency that is responsible for the stewardship of the nation’s ocean resources, including the management of the majority of marine mammals, such as whales, dolphins, porpoises, seals, and sea lions. The U.S. Fish and Wildlife Service (USFWS) has jurisdiction over walruses, polar bears, manatees, dugongs, and sea [...]
False killer whales can lower their hearing sensitivity A recent paper by Paul Nachtigall and Alexander Supin describes how a false killer whale is able to lower its hearing sensitivity before a loud sound when given a warning beforehand. Because many marine animals depend on their hearing for feeding and communication, loud sounds in the environment can have [...]
Hydrophone Provides Continuous, Live Stream of Deep Sea Sounds from Monterey Bay Location of the MARS hydrophone, on the Smooth Ridge, at the edge of Monterey Canyon, approximately 30 km (18 mi) from shore. Image credit: MBARI. The Monterey Accelerated Research System (MARS) cabled observatory, the first cabled oceanographic observatory on the U.S. [...]
Mass Strandings The term stranding refers to an aquatic animal observed in an inappropriate location, for example, an offshore species found inshore. Most often, stranded animals are found on a beach or in shallow water. Along the U.S. coast alone, about 1,000 cetaceans and 2,500 pinnipeds strand annually. When three or more animals strand together in time [...]
Monitoring the Construction of the First U.S. Offshore Wind Farm for Potential Noise Impacts on Marine Life Scientists deploy a hydrophone array to monitor the noise from construction of wind turbines of the coast of Block Island, Rhode Island. Photo credit: Jim Miller. Wind energy is increasingly being used as an alternative energy source. Winds [...]
Searching for Malaysia Airlines Flight 370 UPDATE 2017: On January 17, 2017 the tripartite Ministers of Australia, Malaysia and China announced that the underwater search for MH370 was suspended. UPDATE: Upon further review, the pingers that were found in April are not thought to be from flight MH370. The search for Flight MH370 will continue using [...]
Acoustic Tracking Technologies Shed Light on the Feeding Behavior of Great White Sharks (left) Specially modified REMUS (remote environmental monitoring unit) autonomous underwater vehicle (AUV) used to locate, follow, and record the behavior, habitat use, and feeding ecology of great white sharks off the coast of Mexico. Note the bite marks, scrapes, and scars [...]
Ocean-Based Renewable Energy The European Union (EU) has committed to producing 20% of its energy from renewable sources by 2020. This has led countries such as Sweden, Ireland, Germany, and Denmark to be pioneers in developing a variety of technologies to harness and deliver energy. Systems associated with winds, waves, and tides produce underwater noise, the effects [...]
An international team of experts have partnered on a “bold” conservation plan (VaquitaCPR; https://www.vaquitacpr.org) to prevent the most endangered marine mammal in the world, the vaquita porpoise (Phocoena sinus), from going extinct. The vaquita is only found in the upper portion of Mexico’s Gulf of California. Its population was estimated at 567 individuals in 1997, [...]
