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Retention and loss of PIT tags and surgically implanted devices in the Eurasian beaver

Mayer, Martin and Lian, Marianne and Fuchs, Boris and Robstad, Christian and Evans, Alina L. and Perrin, Kathryn and Greunz, Eva and Laske, Timothy G. and Arnemo, Jon M. and Arnemo, Jon and Rosell, Frank (2022). Retention and loss of PIT tags and surgically implanted devices in the Eurasian beaver. BMC Veterinary Research. 18 , 219
[Research article]

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Abstract

Background Passive integrated transponder devices (PIT tags) are a valuable tool for individual identification of animals. Similarly, the surgical implantation of transmitters and bio-loggers can provide useful data on animal location, physiology and behavior. However, to avoid unnecessary recapture and related stress of study animals, PIT tags and bio-loggers should function reliably for long periods of time. Here, we evaluated the retention of PIT tags, and of very high frequency (VHF) transmitters and bio-loggers that were either implanted subcutaneously or into the peritoneal cavity of Eurasian beavers (Castor fiber). Results Over a 21-year period, we implanted PIT tags in 456 individuals and failed to detect a PIT tag at recapture in 30 cases, consisting of 26 individuals (6% of individuals). In all instances, we were still able to identify the individual due to the presence of unique ear tag numbers and tail scars. Moreover, we implanted 6 VHFs, 36 body temperature loggers and 21 heart rate loggers in 28 individuals, and experienced frequent loss of temperature loggers (at least 6 of 23 recaptured beavers) and heart rate loggers (10 of 18 recaptured beavers). No VHFs were lost in 2 recaptured beavers. Conclusions Possible causes for PIT tag loss (or non-detection) were incorrect implantation, migration of the tag within the body, a foreign body reaction leading to ejection, or malfunctioning of the tag. We speculate that logger loss was related to a foreign body reaction, and that loggers were either rejected through the incision wound or, in the case of temperature loggers, possibly adhered and encapsulated to intestines, and then engulfed by the gastro-intestinal tract and ejected. We discuss animal welfare implications and give recommendations for future studies implanting bio-loggers into wildlife.

Authors/Creators:Mayer, Martin and Lian, Marianne and Fuchs, Boris and Robstad, Christian and Evans, Alina L. and Perrin, Kathryn and Greunz, Eva and Laske, Timothy G. and Arnemo, Jon M. and Arnemo, Jon and Rosell, Frank
Title:Retention and loss of PIT tags and surgically implanted devices in the Eurasian beaver
Series Name/Journal:BMC Veterinary Research
Year of publishing :2022
Volume:18
Article number:219
Number of Pages:9
Publisher:BMC
ISSN:1746-6148
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Other Veterinary Science
Keywords:Animal welfare, Body temperature logger, Castor fiber, Heart rate logger, Surgery
URN:NBN:urn:nbn:se:slu:epsilon-p-118027
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118027
Additional ID:
Type of IDID
DOI10.1186/s12917-022-03333-1
Web of Science (WoS)000809358000002
ID Code:28650
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:30 Aug 2022 13:25
Metadata Last Modified:30 Aug 2022 13:31

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