Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics
A simple photographic technique was developed to indirectly estimate body mass data for southern elephant seal (Mirounga leonina) cows (postlactation), yearlings, and immature males and females. Regressions of mass on both photographic and morphometric variables (together and separately) yielded use...
Published in: | Marine Mammal Science |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Society for Marine Mammalogy
1997
|
Subjects: | |
Online Access: | https://doi.org/10.1111/j.1748-7692.1997.tb00090.x http://ecite.utas.edu.au/11827 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:11827 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:11827 2023-05-15T16:05:13+02:00 Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics Bell, CM Hindell, MA Burton, HR 1997 https://doi.org/10.1111/j.1748-7692.1997.tb00090.x http://ecite.utas.edu.au/11827 en eng Society for Marine Mammalogy http://dx.doi.org/10.1111/j.1748-7692.1997.tb00090.x Bell, CM and Hindell, MA and Burton, HR, Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics, Marine Mammal Science, 13, (4) pp. 669-682. ISSN 0824-0469 (1997) [Refereed Article] http://ecite.utas.edu.au/11827 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 1997 ftunivtasecite https://doi.org/10.1111/j.1748-7692.1997.tb00090.x 2019-12-13T20:56:47Z A simple photographic technique was developed to indirectly estimate body mass data for southern elephant seal (Mirounga leonina) cows (postlactation), yearlings, and immature males and females. Regressions of mass on both photographic and morphometric variables (together and separately) yielded useful, predictable models. Using such variables, the best estimation of the actual mass was for postlactation cows, with a 95% confidence interval of 2.66% of the predicted body mass. Although combining photographic and morphometric variables produced the most reliable models specifically for cows and yearlings, the most practical model contained only the morphometric variables length and girth squared. Side area was the best correlated single photographic variable and this corresponded with other studies. Photogrammetry could be useful when animals cannot be sedated and are located on a flat surface, but it does require animals to be motionless when approached. Thus, the procedure may be more suited to bulls rather than other age classes and could have a role in studies where large numbers of mass estimations are rapidly required. If sedation is utilized in smaller animals, then the use of body length and girth is the most suitable indirect mass estimation technique to avoid the use of heavy weighing equipment. Article in Journal/Newspaper Elephant Seal Mirounga leonina Southern Elephant Seal eCite UTAS (University of Tasmania) Marine Mammal Science 13 4 669 682 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Bell, CM Hindell, MA Burton, HR Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
A simple photographic technique was developed to indirectly estimate body mass data for southern elephant seal (Mirounga leonina) cows (postlactation), yearlings, and immature males and females. Regressions of mass on both photographic and morphometric variables (together and separately) yielded useful, predictable models. Using such variables, the best estimation of the actual mass was for postlactation cows, with a 95% confidence interval of 2.66% of the predicted body mass. Although combining photographic and morphometric variables produced the most reliable models specifically for cows and yearlings, the most practical model contained only the morphometric variables length and girth squared. Side area was the best correlated single photographic variable and this corresponded with other studies. Photogrammetry could be useful when animals cannot be sedated and are located on a flat surface, but it does require animals to be motionless when approached. Thus, the procedure may be more suited to bulls rather than other age classes and could have a role in studies where large numbers of mass estimations are rapidly required. If sedation is utilized in smaller animals, then the use of body length and girth is the most suitable indirect mass estimation technique to avoid the use of heavy weighing equipment. |
format |
Article in Journal/Newspaper |
author |
Bell, CM Hindell, MA Burton, HR |
author_facet |
Bell, CM Hindell, MA Burton, HR |
author_sort |
Bell, CM |
title |
Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
title_short |
Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
title_full |
Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
title_fullStr |
Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
title_full_unstemmed |
Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics |
title_sort |
estimation of body mass in the southern elephant seal, mirounga leonina , by photogrammetry and morphometrics |
publisher |
Society for Marine Mammalogy |
publishDate |
1997 |
url |
https://doi.org/10.1111/j.1748-7692.1997.tb00090.x http://ecite.utas.edu.au/11827 |
genre |
Elephant Seal Mirounga leonina Southern Elephant Seal |
genre_facet |
Elephant Seal Mirounga leonina Southern Elephant Seal |
op_relation |
http://dx.doi.org/10.1111/j.1748-7692.1997.tb00090.x Bell, CM and Hindell, MA and Burton, HR, Estimation of body mass in the southern elephant seal, Mirounga leonina , by photogrammetry and morphometrics, Marine Mammal Science, 13, (4) pp. 669-682. ISSN 0824-0469 (1997) [Refereed Article] http://ecite.utas.edu.au/11827 |
op_doi |
https://doi.org/10.1111/j.1748-7692.1997.tb00090.x |
container_title |
Marine Mammal Science |
container_volume |
13 |
container_issue |
4 |
container_start_page |
669 |
op_container_end_page |
682 |
_version_ |
1766401119312936960 |