Pollard Simon D
Zoology Department, University of Canterbury, Christchurch, New Zealand.
Oecologia. 1988 Aug;76(3):475-476. doi: 10.1007/BF00377046.
A number of studies on the feeding behaviour of sucking predators have estimated the weight of biomass the predator extracts from the prey by measuring the weight change occurring in the prey. This method does not consider that a proportion of the prey weight change is lost to the immediate environment. I examined the spider Diaea sp. feeding on the fruit fly Drosophila immigrans and found that the prey lost approximately 28% more weight than the predator gained. This difference was largely explained by water loss from the prey. My results suggest that water loss, which is not available to the predator, is an important part of prey weight loss. To avoid overestimating predator biomass gain it is necessary to measure the predator weight gain directly or take into account water loss as a component of prey weight change.
一些关于吸食性捕食者摄食行为的研究，通过测量猎物发生的重量变化，估算了捕食者从猎物中获取的生物量重量。这种方法没有考虑到猎物重量变化的一部分会散失到周围环境中。我研究了以黑腹果蝇为食的Diaea蜘蛛，发现猎物损失的重量比捕食者增加的重量大约多28%。这种差异主要是由于猎物失水造成的。我的研究结果表明，捕食者无法利用的失水是猎物重量损失的一个重要部分。为避免高估捕食者生物量的增加，有必要直接测量捕食者的重量增加，或者将失水作为猎物重量变化的一个组成部分加以考虑。
