Lymbery A J, Hobbs R P, Thompson R C
Division of Veterinary Biology, School of Veterinary Studies, Murdoch University, Western Australia.
J Parasitol. 1989 Aug;75(4):562-70.
We studied the dispersion of adult Echinococcus granulosus in the intestine of experimentally infected dogs at 2 scales of habitat use. On a coarse scale, worms were found most frequently in the anterior third of the small intestine. On a fine scale, clumps or aggregations, typically of 4-5 worms in an area of 12 mm2, occurred throughout the anterior two-thirds of the intestine. The most likely proximate cause of aggregative behavior is attraction between individual worms. There are at least 2 equally plausible ultimate causes of the behavior: to enhance cross-fertilization and to improve the quality of the environment. Restriction of worms to the anterior small intestine may be a consequence of aggregative behavior on a finer scale or a response to different proximate and ultimate factors.
我们在两个栖息地利用尺度上研究了实验感染犬肠道内成年细粒棘球绦虫的分布情况。在粗略尺度上，蠕虫最常出现在小肠前三分之一处。在精细尺度上，肠道前三分之二处均出现了虫团或聚集物，通常在12平方毫米的区域内有4至5条蠕虫。聚集行为最可能的直接原因是个体蠕虫之间的吸引。该行为至少有两个同样合理的根本原因：增强异体受精以及改善环境质量。蠕虫局限于小肠前部可能是更精细尺度上聚集行为的结果，或者是对不同直接和根本因素的反应。
