Temporal patterns in the acoustic signals of beaked whales at Cross Seamount.

Published

Journal Article

Seamounts may influence the distribution of marine mammals through a combination of increased ocean mixing, enhanced local productivity and greater prey availability. To study the effects of seamounts on the presence and acoustic behaviour of cetaceans, we deployed a high-frequency acoustic recording package on the summit of Cross Seamount during April through October 2005. The most frequently detected cetacean vocalizations were echolocation sounds similar to those produced by ziphiid and mesoplodont beaked whales together with buzz-type signals consistent with prey-capture attempts. Beaked whale signals occurred almost entirely at night throughout the six-month deployment. Measurements of prey presence with a Simrad EK-60 fisheries acoustics echo sounder indicate that Cross Seamount may enhance local productivity in near-surface waters. Concentrations of micronekton were aggregated over the seamount in near-surface waters at night, and dense concentrations of nekton were detected across the surface of the summit. Our results suggest that seamounts may provide enhanced foraging opportunities for beaked whales during the night through a combination of increased productivity, vertical migrations by micronekton and local retention of prey. Furthermore, the summit of the seamount may act as a barrier against which whales concentrate prey.

Full Text

Duke Authors

Cited Authors

  • Johnston, DW; McDonald, M; Polovina, J; Domokos, R; Wiggins, S; Hildebrand, J

Published Date

  • April 2008

Published In

Volume / Issue

  • 4 / 2

Start / End Page

  • 208 - 211

PubMed ID

  • 18252660

Pubmed Central ID

  • 18252660

Electronic International Standard Serial Number (EISSN)

  • 1744-957X

International Standard Serial Number (ISSN)

  • 1744-9561

Digital Object Identifier (DOI)

  • 10.1098/rsbl.2007.0614

Language

  • eng