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The impact of live trapping and trap model on the stress profiles of N orth A merican red squirrels
Author(s) -
Bosson C.O.,
Islam Z.,
Boonstra R.
Publication year - 2012
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.2012.00941.x
Subject(s) - trap (plumbing) , biology , zoology , physics , meteorology
Abstract Live‐capture is a necessary component for the scientific study and management of most mammals, but it may negatively affect their health and physiology. We compared blood parameters related to the stress response (nominal base levels) from red squirrels T amiasciurus hudsonicus after capture of up to 4.5 h in five different live trap models ( H ava‐hart, S herman, T omahawk 102, T omahawk 103 and ‘ S pecial S quirrel’ trap) with true base levels (obtained in less than three minutes). In addition, we evaluated the capture rate in the five trap models. We found that (1) prolonged time in live traps altered stress hormone concentrations compared with true base levels, but maximum corticosteroid‐binding capacity was unaffected; (2) squirrels captured in a trap model with reduced visibility (a roof cover – Hava‐hart) had significantly lower ( c. 50%) mean free cortisol levels compared with those captured in a trap model with full visibility ( T omahawk 102), but all other blood parameters were similar; (3) cortisol levels and white blood cell counts (mainly neutrophil counts) were positively related to duration of capture; (4) a non‐covered trap ( T omahawk 102) was most effective and fully covered trap ( S herman) was least effective at capturing squirrels. We discuss the use of effective, yet less stress‐inducing trap models to mitigate the stress caused by live‐capture on these animals. We conclude that covered traps such as the H ava‐hart may reduce trap‐induced stress in red squirrels, but at the same time also reduces their capture rates.

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