Pii: S0269-7491(98)00196-1
نویسندگان
چکیده
Many vespertilionid bats roost in proximity to roo®ng timbers and are therefore potentially exposed to organochlorines used as wood preservatives. Organochlorines elevate metabolic rate (MR) in some vertebrate species and any such eect in bats may threaten survival. The aim of this study was to determine whether sublethal exposure to lindane aected the body mass, food intake and MR of pipistrelle bats Pipistrellus pipistrellus and whether any such eects were modi®ed by environmental conditions and the presence of co-roosting bats. Bats held indoors and receiving repeated doses of 50 mg of lindane lost mass (ÿ0.26 g) relative to coroosting bats receiving either 10 or 0 mg. Lindane increased the mealworm intake of bats, those with 0.45 g of body lipid increased their mealworm intake by 0.29 g DW nightÿ1 when given lindane doses of 50 mg batÿ1 3 daysÿ1. The magnitude of this eect decreased as bats became heavier. Lindane signi®cantly increased MR in bats and the eect was most pronounced in lean individuals. Environmental temperature and the presence of co-roosting bats altered the impact of lindane, the pesticide-mediated elevation of MR being greater under cold conditions. It was predicted that, under the environmental conditions of the experiment, exposure to 50 mg lindane batÿ1 3 daysÿ1 would increase the 24-h MR of a 7.3 g bat by 3.4 kJ (15%) and that of a 6.3 g bat by 4.8 kJ (23%). Such sublethal exposure might constitute a signi®cant threat to free-living bats. # 1999 Elsevier Science Ltd. All rights reserved.
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