Ecological Acoustic Recorder (EAR) Sounds Transcripts

All sounds were recorded using an Ecological Acoustic Recorder (EAR) set at a sampling rate between 25 KHz to 50 KHz. The EARs are set to record 30 seconds with a 15-minute duty cycle.

Dolphin Whistles

A pod of Hawaiian spinner dolphins produces high-pitched whistles on the West Coast of Oahu, Hawaii.

Unidentified Fish

An unidentified species of fish produces a series of tones of descending pitch with an upward sweep at the end. Our acoustic technicians describe the sound as the muted trumpet signal.

Domino Damselfish

A domino damselfish or (Dascyllus albisella) produces series of "chirps" as part of a territorial display.

Humpback Whale

Humpback whales inhabit Hawaiian waters during the winter months where they travel to mate and give birth. Male humpbacks sing as part of a reproductive display, although the exact function of the song is unknown. The sound file is a recording of a male humpback whale singing off the coast of Oahu, Hawaii.

Dolphin Sonar

Sonar or "sound navigation ranging" is used by dolphins to echolocate underwater. Echolocating animals emit sound into the environment and listen for echoes reflected by objects or surfaces underwater. The echoes are used to locate, range and identify objects within the environment. This is particularly useful underwater because these environments are not only susceptible to light variation depending on day and night cycles, but light is also limited by water turbidity, depth, distance and other factors that affect underwater visibility.

On this sound file a dolphin emits a series of clicks used for echolocation.

Snapping Shrimp

One of the most ubiquitous underwater sound producers are snapping shrimp. They produce a cavitation bubble by quickly closing their enlarged claw, this sound is used to stun nearby prey. Loud pops and snaps produced by snapping shrimp were recorded on a reef in Kaneohe Bay, Hawaii.

Boat Motor

Anthropogenic or man-made sounds can be heard underwater. Shipping and recreational vessels are noise producers in aquatic environments. This file of loud vessel engine noise was recorded in Tutuila, American Samoa.

Heavy Rain

A rain storm is heard from 45 feet underwater at Pear and Hermes atoll within the Papahānaumokuākea National Monument, Hawaii.