Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland

Claire Lacey; Russell Leaper; Anna Moscrop; Douglas Michael Gillespie; Richard McLanaghan; Steve Brown

doi:10.1017/S0025315409000769

Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland

Claire Lacey, Russell Leaper, Anna Moscrop, Douglas Michael Gillespie, Richard McLanaghan, Steve Brown

Research output: Contribution to journal › Article › peer-review

Abstract

Photo-grammetric techniques developed for measuring body length and small scale movement patterns of cetaceans were applied to surface swimming basking sharks off the west coast of Scotland. These methods removed the need for close approaches, reducing the likelihood of disturbing the focal animal. Average swimming speed was calculated from the total path length between shark locations measured at approximately one minute intervals. These average speeds varied from 0.49 to 0.73 ms−1 for tracks of between 30 and 170 minutes' duration. Body length measurements ranged between 2.35 and 6.43 m. For ten sharks where body length and swimming speed were measured there was a significant correlation between body length (L) and swimming speed (V) expressed as V = 0.36L033.

Original language	English
Pages (from-to)	361-366
Number of pages	6
Journal	Journal of the Marine Biological Association of the United Kingdom
Volume	90
Issue number	2
Early online date	10 Aug 2009
DOIs	https://doi.org/10.1017/S0025315409000769
Publication status	Published - Mar 2010

Keywords

Basking shark
Photo-gammetric techniques
Size estimation

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10.1017/S0025315409000769

Lacey2009JMarBiolAssUK 90 2 361
Copyright © Marine Biological Association of the United Kingdom 2009. Published by Cambridge University Press
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title = "Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland",

abstract = "Photo-grammetric techniques developed for measuring body length and small scale movement patterns of cetaceans were applied to surface swimming basking sharks off the west coast of Scotland. These methods removed the need for close approaches, reducing the likelihood of disturbing the focal animal. Average swimming speed was calculated from the total path length between shark locations measured at approximately one minute intervals. These average speeds varied from 0.49 to 0.73 ms−1 for tracks of between 30 and 170 minutes' duration. Body length measurements ranged between 2.35 and 6.43 m. For ten sharks where body length and swimming speed were measured there was a significant correlation between body length (L) and swimming speed (V) expressed as V = 0.36L033.",

keywords = "Basking shark, Photo-gammetric techniques, Size estimation",

author = "Claire Lacey and Russell Leaper and Anna Moscrop and Gillespie, {Douglas Michael} and Richard McLanaghan and Steve Brown",

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T1 - Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland

AU - Lacey, Claire

AU - Leaper, Russell

AU - Moscrop, Anna

AU - Gillespie, Douglas Michael

AU - McLanaghan, Richard

AU - Brown, Steve

N1 - This work was funded and conducted by the International Fund for Animal Welfare.

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N2 - Photo-grammetric techniques developed for measuring body length and small scale movement patterns of cetaceans were applied to surface swimming basking sharks off the west coast of Scotland. These methods removed the need for close approaches, reducing the likelihood of disturbing the focal animal. Average swimming speed was calculated from the total path length between shark locations measured at approximately one minute intervals. These average speeds varied from 0.49 to 0.73 ms−1 for tracks of between 30 and 170 minutes' duration. Body length measurements ranged between 2.35 and 6.43 m. For ten sharks where body length and swimming speed were measured there was a significant correlation between body length (L) and swimming speed (V) expressed as V = 0.36L033.

AB - Photo-grammetric techniques developed for measuring body length and small scale movement patterns of cetaceans were applied to surface swimming basking sharks off the west coast of Scotland. These methods removed the need for close approaches, reducing the likelihood of disturbing the focal animal. Average swimming speed was calculated from the total path length between shark locations measured at approximately one minute intervals. These average speeds varied from 0.49 to 0.73 ms−1 for tracks of between 30 and 170 minutes' duration. Body length measurements ranged between 2.35 and 6.43 m. For ten sharks where body length and swimming speed were measured there was a significant correlation between body length (L) and swimming speed (V) expressed as V = 0.36L033.

KW - Basking shark

KW - Photo-gammetric techniques

KW - Size estimation

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DO - 10.1017/S0025315409000769

M3 - Article

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VL - 90

SP - 361

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JO - Journal of the Marine Biological Association of the United Kingdom

JF - Journal of the Marine Biological Association of the United Kingdom

IS - 2

ER -

Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland

Abstract

Keywords

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