TY - JOUR
TI - Speaking up: Killer whales (Orcinus orca) increase their call amplitude in response to vessel noise
AU - Holt, M
AU - Noren, D
AU - Veirs, V
AU - Emmons, C
AU - Veirs, S
T2 - The Journal of the Acoustical Society of America
AB - This study investigated the effects of anthropogenic sound exposure on the vocal behavior of free-ranging killer whales. Endangered Southern Resident killer whales inhabit areas including the urban coastal waters of Puget Sound near Seattle, WA, where anthropogenic sounds are ubiquitous, particularly those from motorized vessels. A calibrated recording system was used to measure killer whale call source levels and background noise levels (1–40kHz). Results show that whales increased their call amplitude by 1dB for every 1dB increase in background noise levels. Furthermore, nearby vessel counts were positively correlated with these observed background noise levels.
DA - 2009/01//
PY - 2009
VL - 125
SP - EL27
EP - EL32
UR - https://asa.scitation.org/doi/full/10.1121/1.3040028
DO - 10.1121/1.3040028
LA - English
KW - Noise
KW - Marine Mammals
KW - Cetaceans
KW - Human Dimensions
KW - Navigation
ER -