The deepest spot on Earth is a surprisingly noisy place, scientists from Oregon discovered when they lowered a hydrophone almost seven miles below the ocean surface into the Challenger Deep. Listen to what they found.
The speed of vessels operating near endangered killer whales in Washington is the most influential factor – more so than vessel size – in how much noise from the boats reaches the whales, according to a new study published today in the online journal PLOS ONE.
The new study by scientists from the University of Washington and National Oceanic and Atmospheric Administration (NOAA) Fisheries is the first to examine how much noise from individual boats reaches the whales in the inland waters of Washington and British Columbia, where they are a popular attraction for recreational and commercial whale watching vessels.
Stanford University researchers are deploying a fleet of static buoys and Wave Glider robots to turn the waters off the coast of San Francisco into a huge WiFi network to track tagged fish and animals.
The network acts like a huge Wi-Fi system and relies on cheap, long-lasting acoustical tags. When a tagged fish passed within 1,000 feet (304.8 m) of a data receiver, the acoustic signal is recorded and uploaded along with a timestamp and GPS location to a shore station. The buoys that make up the static part of the network are placed where white sharks are most likely to be. However, it’s an axiom of science that if you already know where something is, then there’s no point in looking for it, so the network also uses Wave Glider robots to rove about the area to cover any holes.