An Evaluation of Long-term Capture Effects in Ursids: Implications for Wildlife Welfare and Research

By Marc Cattet, John Boulanger, Gordon B. Stenhouse, Roger A. Powell, Melissa J Reynolds-Hogland. 2008

218 citations recorded by the source corpus.

Abstract The need to capture wild animals for conservation, research, and management is well justified, but long-term effects of capture and handling remain unclear. We analyzed standard types of data collected from 127 grizzly bears (Ursus arctos) captured 239 times in western Alberta, Canada, 1999–2005, and 213 American black bears (U. americanus) captured 363 times in southwestern North Carolina, 1981–2002, to determine if we could detect long-term effects of capture and handling, that is, effects persisting ≥1 month. We measured blood serum levels of aspartate aminotransferase (AST), creatine kinase (CK), and myoglobin to assess muscle injury in association with different methods of capture. Serum concentrations of AST and CK were above normal in a higher proportion of captures by leghold snare (64% of 119 grizzly bear captures and 66% of 165 black bear captures) than capture by helicopter darting (18% of 87 grizzly bear captures) or by barrel trap (14% of 7 grizzly bear captures and 29% of 7 black bear captures). Extreme AST values (>5 times upper reference limit) in 7 (6%) grizzly bears and 29 (18%) black bears captured by leghold snare were consistent with the occurrence of exertional (capture) myopathy. We calculated daily movement rates for 91 radiocollared grizzly bears and 128 radiocollared black bears to determine if our activities affected their mobility during a 100-day period after capture. In both species, movement rates decreased below mean normal rate immediately after capture (grizzly bears: X̄ = 57% of normal, 95% confidence interval = 45–74%; black bears: 77%, 64–88%) and then returned to normal in 3–6 weeks (grizzly bears: 28 days, 20–37 days; black bears: 36 days, 19–53 days). We examined the effect of repeated captures on age-related changes in body condition of 127 grizzly bears and 207 black bears and found in both species that age-specific body condition of bears captured ≥2 times (42 grizzly bears and 98 black bears) tended to be poorer than that of bears captured once only (85 grizzly bears and 109 black bears), with the magnitude of effect directly proportional to number of times captured and the effect more evident with age. Importantly, the condition of bears did not affect their probability of capture or recapture. These findings challenge persons engaged in wildlife capture to examine their capture procedures and research results carefully. Significant capture-related effects may go undetected, providing a false sense of the welfare of released animals. Further, failure to recognize and account for long-term effects of capture and handling on research results can potentially lead to erroneous interpretations.

Subfields: Ecology, Small Animals

View Paper: https://www.semanticscholar.org/paper/07b11d2375a223738c1fb71f2a588f7f6a82a4aa

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Citations in the corpus

Stress: An inevitable component of animal translocation (2010, background): “Capture myopathy can also have long-term effects and significantly affect overall body condition (Cattet et al., 2008) or ability to escape predation (Montané et al.”
The Effect of Capture on Ranging Behaviour and Activity of the European Roe Deer Capreolus capreolus (2009, background): “…et al. 2005), onbiological orphysiological parameters (Kock et al. 1987,Marco&Lavin 1999, Montané et al. 2002,Bonacic et al. 2006), on injuries (Cattet et al. 2008, Webb et al. 2008), on reproduction (Ramsay & Stirling 1986, Laurenson & Caro 1994, Côté et al. 1998) and on body condition…”
Dynamic wildlife habitat models: Seasonal foods and mortality risk predict occupancy-abundance and habitat selection in grizzly bears (2010, background): “…distribution of food resource patches, seasonal diets and regional patterns of mortality risk can be used to identify spatially and temporally dynamic patterns of habitat quality without the need of invasive (Cattet et al., 2008) and costly animal capture and collaring approaches now commonly used.”