理想自由分布理论认为捕食者会在各分部区间移动，直到各区有利度相等。
The ideal free distribution theory suggests that predators should move among sites until profitability is equal.
捕食者趋向于聚集在最有利可图的斑块中，直至移到另一块不太拥挤的斑块中去会更好。
Predator will tend to aggregate in the most profitable patches, but predator crowding will reduce the patch profitability until it is better to another less crowded patch.
柑桔园中存在其它补充食物时对这两种捕食敌有利。
The existence of other alternate foods in citrus orchards is of benefit to the predacious mites.
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