Diving depths of Northern Gannets

Acoustic observations of Sula bassana from an autonomous underwater vehicle

A S Brierley, P G Fernandes

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The Autonomous Underwater Vehicle (AUV) Auiosub-1 made observations of the sea surface with an upward-looking echosounder during fish surveys in the vicinity of Shetland and Orkney (North Sea) in July 1999. Echograms from the AUV contained vertical traces extending downwards from the sea surface that were caused by diving seabirds. Visual observations provided evidence that those seabirds were Northern Cannets Sula bassana. Analysis of trace extent suggests a mean dive depth of 19.7 m (n = 19, SD = 7.5). Data on gannet diving depths are sparse, but this value is somewhat deeper than that accepted for the related Cafe Gannet (Morus capensis, mean 5.9 m) which has been used in foraging models for the Northern Gannet. These observations have implications for our understanding of the foraging capabilities of gannets, and the interactions of gannets with commercially targeted fish species.

Original languageEnglish
Pages (from-to)529-534
Number of pages6
JournalAuk
Volume118
Issue number2
Publication statusPublished - Apr 2001

Keywords

  • performance
  • albatrosses
  • penguins
  • Shetland
  • ocean
  • sea

Cite this

Diving depths of Northern Gannets : Acoustic observations of Sula bassana from an autonomous underwater vehicle. / Brierley, A S ; Fernandes, P G .

In: Auk, Vol. 118, No. 2, 04.2001, p. 529-534.

Research output: Contribution to journalArticle

@article{a69f6a714d3b479aa3fb4209a76ce5bb,
title = "Diving depths of Northern Gannets: Acoustic observations of Sula bassana from an autonomous underwater vehicle",
abstract = "The Autonomous Underwater Vehicle (AUV) Auiosub-1 made observations of the sea surface with an upward-looking echosounder during fish surveys in the vicinity of Shetland and Orkney (North Sea) in July 1999. Echograms from the AUV contained vertical traces extending downwards from the sea surface that were caused by diving seabirds. Visual observations provided evidence that those seabirds were Northern Cannets Sula bassana. Analysis of trace extent suggests a mean dive depth of 19.7 m (n = 19, SD = 7.5). Data on gannet diving depths are sparse, but this value is somewhat deeper than that accepted for the related Cafe Gannet (Morus capensis, mean 5.9 m) which has been used in foraging models for the Northern Gannet. These observations have implications for our understanding of the foraging capabilities of gannets, and the interactions of gannets with commercially targeted fish species.",
keywords = "performance, albatrosses, penguins, Shetland, ocean, sea",
author = "Brierley, {A S} and Fernandes, {P G}",
year = "2001",
month = "4",
language = "English",
volume = "118",
pages = "529--534",
journal = "Auk",
issn = "0004-8038",
publisher = "AMER ORNITHOLOGISTS UNION",
number = "2",

}

TY - JOUR

T1 - Diving depths of Northern Gannets

T2 - Acoustic observations of Sula bassana from an autonomous underwater vehicle

AU - Brierley, A S

AU - Fernandes, P G

PY - 2001/4

Y1 - 2001/4

N2 - The Autonomous Underwater Vehicle (AUV) Auiosub-1 made observations of the sea surface with an upward-looking echosounder during fish surveys in the vicinity of Shetland and Orkney (North Sea) in July 1999. Echograms from the AUV contained vertical traces extending downwards from the sea surface that were caused by diving seabirds. Visual observations provided evidence that those seabirds were Northern Cannets Sula bassana. Analysis of trace extent suggests a mean dive depth of 19.7 m (n = 19, SD = 7.5). Data on gannet diving depths are sparse, but this value is somewhat deeper than that accepted for the related Cafe Gannet (Morus capensis, mean 5.9 m) which has been used in foraging models for the Northern Gannet. These observations have implications for our understanding of the foraging capabilities of gannets, and the interactions of gannets with commercially targeted fish species.

AB - The Autonomous Underwater Vehicle (AUV) Auiosub-1 made observations of the sea surface with an upward-looking echosounder during fish surveys in the vicinity of Shetland and Orkney (North Sea) in July 1999. Echograms from the AUV contained vertical traces extending downwards from the sea surface that were caused by diving seabirds. Visual observations provided evidence that those seabirds were Northern Cannets Sula bassana. Analysis of trace extent suggests a mean dive depth of 19.7 m (n = 19, SD = 7.5). Data on gannet diving depths are sparse, but this value is somewhat deeper than that accepted for the related Cafe Gannet (Morus capensis, mean 5.9 m) which has been used in foraging models for the Northern Gannet. These observations have implications for our understanding of the foraging capabilities of gannets, and the interactions of gannets with commercially targeted fish species.

KW - performance

KW - albatrosses

KW - penguins

KW - Shetland

KW - ocean

KW - sea

M3 - Article

VL - 118

SP - 529

EP - 534

JO - Auk

JF - Auk

SN - 0004-8038

IS - 2

ER -