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首页> 外文期刊>Journal of Parasitology >THE CROWDING EFFECT AND MORPHOMETRIC VARIABILITY IN ECHINOSTOMA CAPRONI (DIGENEA: ECHINOSTOMATIDAE) FROM ICR MICE
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THE CROWDING EFFECT AND MORPHOMETRIC VARIABILITY IN ECHINOSTOMA CAPRONI (DIGENEA: ECHINOSTOMATIDAE) FROM ICR MICE

机译：ICR小鼠在胃粘膜棘皮动物（DIGENEA：ECHINOSTOMATIDAE）中的拥挤效应和形态学变异性

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摘要

Population density, or crowding, was examined to determine its effect on the morphometric variability of Echinostoma caproni (Digenea) in ICR mice. Six mice were infected with 25 and 100 metacercariae, and a single mouse was infected with 300 metacercariae. All mice were infected at necropsy 22 days postinfection with recoveries of 77%, 69%, and 7.3%, respectively. Whole mounts were prepared, and 31 characters were evaluated (25 direct measurements and 6 ratios). Univariate and multivariate statistical analysis revealed significant differences between adult worms from all 3 groups. Twenty-seven of 31 characters showed significant within-group differences, with the primary differences between worms from 25/100 versus 300 metacercariae infections. Discriminant function analysis yielded a 100% correct classification based on infection size, which is consistent with studies on distinct species of Echinostoma. The low recovery from the mouse infected with 300 metacercariae suggests inflammatory expulsion of juvenile worms and the possibility of immunity as a factor in the crowding effect. These results suggest that external factors may affect morphometric variability of digenetic trematodes to a larger degree than previously recognized.
机译：检查了种群密度或拥挤情况，以确定其对ICR小鼠中卡氏棘突oma虫（Digenea）形态计量变异性的影响。 6只小鼠感染了25和100个meta尾meta，一只小鼠感染了300个cer尾e。感染后第22天，尸检均感染了所有小鼠，回收率分别为77％，69％和7.3％。准备了整个坐骑，并评估了31个字符（25个直接测量值和6个比率）。单变量和多变量统计分析显示，所有3组的成虫之间存在显着差异。 31个字符中的27个显示出明显的组内差异，其中蠕虫之间的主要差异是25/100与300尾cer虫感染。判别功能分析基于感染大小得出了100％正确的分类，这与对棘皮动物的不同种类的研究一致。从感染了300种尾cer的小鼠体内回收率较低，这表明幼虫的炎症被驱逐出境，并且免疫力可能是造成拥挤效应的一个因素。这些结果表明，外部因素可能会比以前认识到的程度更大程度地影响双基因吸虫的形态变异。

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