Journal
JOURNAL OF MAMMALOGY
Volume 94, Issue 4, Pages 754-760Publisher
OXFORD UNIV PRESS INC
DOI: 10.1644/12-MAMM-A-242.1
Keywords
animal welfare; bait; Blarina brevicauda; livetrapping; mortality; small mammal; Sorex spp.; Tenebrio molitor
Categories
Funding
- Canadian Association for Humane Trapping
- Universities Federation of Animal Welfare
- Ontario Ministry of Natural Resources
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Accidental mortality is pervasive in small mammal livetrapping studies and presents a welfare concern for the particularly vulnerable shrews (Soricomorpha: Soricidae). Although small mammal researchers are aware of this problem and generally suspect that high mortality rates are caused by nutritional constraints and potentially high moisture requirements, these hypotheses have not been widely tested and the problem persists for lack of a practical solution. We conducted a field experiment to assess the effects of providing either high-energy palatable food or water supplements on mortality rates of Blarina brevicauda and Sorex spp. using standard small mammal livetrapping techniques. Water supplements had no effect on shrew mortality, but mortality rates declined by 49% for B. brevicauda and by 64% for Sorex spp. when sunflower seed bait was supplemented with 4 g of mealworms (Tenebrio molitor) compared to controls. Furthermore, the addition of mealworms as a bait supplement eliminated the adverse effect on mortality of the length of time that Sorex were in traps prior to release. The supplementation of live-trap baits with mealworms, therefore, represents a practical method for small mammal researchers to reduce accidental shrew mortality during small mammal livetrapping.
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