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Article: Mining morphometrics and age from past survey photographs

TitleMining morphometrics and age from past survey photographs
Authors
KeywordsBody size
Images
Morphology
Hunting
African elephants
Issue Date2019
PublisherBioMed Central Ltd. The Journal's web site is located at http://www.frontiersinzoology.com/home/
Citation
Frontiers in Zoology, 2019, v. 16, p. article no. 14 How to Cite?
AbstractBackground Researchers often document wildlife surveys using images. These images contain data that can be used to understand alterative research objectives, even years after they were originally captured. We have developed a method to measure age and morphology (body size measurements and tusk size) from survey image databases and future surveys, without the availability of a known subject distance or a scale in each image. African savanna elephants (Loxodonta africana) serve as an ideal model species to develop a non-invasive, image-based morphometric methodology: as handling these animals is particularly invasive and expensive, involving anaesthesia and because of their IUCN ‘vulnerable’ status. We compare in situ measurements, taken during collaring events, to tusk-to-body-size ratios, measured from the images. Results We provide evidence that relative morphological measurements, musth timing, and age of male African savanna elephants can accurately be obtained from a survey image database of over 30,000 images, taken over an 18-year period. Of the 11 tusk to body size ratios calculated, we recommend the use of two in particular for future measurement in African elephants to determine size and age: 1) tusk length to tusk diameter and 2) tusk length to body height. Conclusions We present a practical, non-invasive measure to estimate morphometrics, including both age and tusk size from photographs, which has conservation applications to the protection of elephants and is relevant to a range of other taxa.
Persistent Identifierhttp://hdl.handle.net/10722/278778
ISSN
2017 Impact Factor: 3.627
2015 SCImago Journal Rankings: 1.866
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorBlack, CE-
dc.contributor.authorMumby, HS-
dc.contributor.authorHenley, MD-
dc.date.accessioned2019-10-21T02:13:53Z-
dc.date.available2019-10-21T02:13:53Z-
dc.date.issued2019-
dc.identifier.citationFrontiers in Zoology, 2019, v. 16, p. article no. 14-
dc.identifier.issn1742-9994-
dc.identifier.urihttp://hdl.handle.net/10722/278778-
dc.description.abstractBackground Researchers often document wildlife surveys using images. These images contain data that can be used to understand alterative research objectives, even years after they were originally captured. We have developed a method to measure age and morphology (body size measurements and tusk size) from survey image databases and future surveys, without the availability of a known subject distance or a scale in each image. African savanna elephants (Loxodonta africana) serve as an ideal model species to develop a non-invasive, image-based morphometric methodology: as handling these animals is particularly invasive and expensive, involving anaesthesia and because of their IUCN ‘vulnerable’ status. We compare in situ measurements, taken during collaring events, to tusk-to-body-size ratios, measured from the images. Results We provide evidence that relative morphological measurements, musth timing, and age of male African savanna elephants can accurately be obtained from a survey image database of over 30,000 images, taken over an 18-year period. Of the 11 tusk to body size ratios calculated, we recommend the use of two in particular for future measurement in African elephants to determine size and age: 1) tusk length to tusk diameter and 2) tusk length to body height. Conclusions We present a practical, non-invasive measure to estimate morphometrics, including both age and tusk size from photographs, which has conservation applications to the protection of elephants and is relevant to a range of other taxa.-
dc.languageeng-
dc.publisherBioMed Central Ltd. The Journal's web site is located at http://www.frontiersinzoology.com/home/-
dc.relation.ispartofFrontiers in Zoology-
dc.rightsFrontiers in Zoology. Copyright © BioMed Central Ltd.-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectBody size-
dc.subjectImages-
dc.subjectMorphology-
dc.subjectHunting-
dc.subjectAfrican elephants-
dc.titleMining morphometrics and age from past survey photographs-
dc.typeArticle-
dc.identifier.emailMumby, HS: hsmumby@hku.hk-
dc.identifier.authorityMumby, HS=rp02538-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1186/s12983-019-0309-x-
dc.identifier.pmid31114625-
dc.identifier.pmcidPMC6513526-
dc.identifier.scopuseid_2-s2.0-85065663183-
dc.identifier.hkuros307937-
dc.identifier.volume16-
dc.identifier.spagearticle no. 14-
dc.identifier.epagearticle no. 14-
dc.publisher.placeUnited Kingdom-

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