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Temporal changes in the quality of hot-iron brands on elephant seal (Mirounga leonina) pups

journal contribution
posted on 2023-05-16, 15:58 authored by van den Hoff, J, Sumner, MD, Field, IC, Bradshaw, CJA, Burton, HR, McMahon, CR
Hot-iron brands were used to mark permanently 14 000 six-week-old southern elephant seal (Mirounga leonina L.) pups at Macquarie Island between 1993 and 2000. We assessed temporal changes in the quality of 4932 brands applied in 1998 and 1999 to determine the duration of the brand wound, and the relationships between brand healing, brand readability and the amount of skin and hair damage peripheral to the brand characters. Most (98%) brand wounds were healed within one year. Brand-mark healing, peripheral skin damage and brand readability were significantly (P < 0.05) correlated. The proportion of healed and readable brands increased in the population during the first annual moult, and thereafter these proportions remained high (>95%) for the marked population. The mean number of brand characters with peripheral skin damage decreased significantly over the same period. The seal's annual hair and skin moult is the process that contributed most to the healing of brand wounds. We also assessed our branding technique to determine whether any of the features we measured contributed to a poor-quality brand. Excessive pressure used during brand-iron application is the most probable cause of unsightly peripheral skin damage, but this damage is short lived.

History

Publication title

Wildlife Research

Volume

31

Issue

6

Pagination

619-629

ISSN

1035-3712

Department/School

School of Natural Sciences

Publisher

CSIRO Publishing

Place of publication

Australia

Repository Status

  • Restricted

Socio-economic Objectives

Climate variability (excl. social impacts)

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    University Of Tasmania

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