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• W2148411037 abstract "AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 5:31-39 (2009) - DOI: https://doi.org/10.3354/ab00135 How to weigh an elephant seal with one finger: a simple three-dimensional photogrammetric application P. J. Nico de Bruyn1,*, Marthán N. Bester1, Alejandro R. Carlini2, W. Chris Oosthuizen1 1Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa 2Departamento de Ciencias Biológicas, Instituto Antárctico Argentino, Cerrito 1248 (1010) Buenos Aires, Argentina *Email: pjndebruyn@zoology.up.ac.za ABSTRACT: Several studies have developed photogrammetric techniques for indirect mass estimation of seals. Unfortunately, these techniques are often narrowly delineated for specific field scenarios or species. Many require sophisticated, custom-designed equipment or analytical tools, limiting their applicability. We aimed to devise a photogrammetric technique for accurate volume/mass estimation of seals under a variety of field scenarios without manipulation of the animal and with minimal equipment. We used Photomodeler Pro 3-dimensional modelling software to estimate the mass of 53 weighed southern elephant seals Mirounga leonina. The method is centred on animal volume estimation in relation to the 3-dimensional area around it, rather than features of the animal itself, an approach that liberates limitations associated with earlier studies. No morphometric body measures are required for such volume/mass estimation. We offer predictive equations that allow high confidence in mass estimates relative to measured mass (95% confidence interval of mean deviation from measured mass is from ±1.34 to ±3.83% depending on the field scenario). A single photographer with a measuring stick and non-customised digital photographic equipment can use this technique to determine the mass of an elephant seal anywhere in the field with the push of a button. KEY WORDS: Southern elephant seal · Mass estimation · Volume estimation · Body size · Field method · Photography · Life history · Phocids Full text in pdf format PreviousNextCite this article as: de Bruyn PJN, Bester MN, Carlini AR, Oosthuizen WC (2009) How to weigh an elephant seal with one finger: a simple three-dimensional photogrammetric application. Aquat Biol 5:31-39. https://doi.org/10.3354/ab00135 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 5, No. 1. Online publication date: February 03, 2009 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2009 Inter-Research." @default.
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• W2148411037 title "How to weigh an elephant seal with one finger: a simple three-dimensional photogrammetric application" @default.
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