褶皱臂尾轮虫包含复杂的同胞物种,对其分类研究经过了一个长期发展的过程。综述了轮虫分类手段的发展进程,介绍和分析了轮虫特别是褶皱臂尾轮虫同胞物种复合类群分类的研究进展。褶皱臂尾轮虫的L-型和S-型属于B.plicatilis和B.rotundiformis两个物种。这个复合类群中还包括更多的种类,如B.plicatilis sensu stricto、B.ibericus和B.rotundiformis,其中B.plicatilis sensu stricto属于L型,B.ibericus属于SM-型,B.rotundiformis属于SS-型。此类研究丰富了轮虫系统分类学,提高了水域生态调查的准确性。
We evaluated the effects of lithium on the survival,growth,and reproduction of D.tibetana in the laboratory.The safe concentration value was 69.3 mg/L.The time to first brood was significant lower for individuals reared in 5 and 10 mg/L(24.4 and 24.0 d,respectively) compared with individuals reared in20,40,or 60 mg/L.Females reared in 5 mg/L lithium produced a mean of 16.5 neonates/brood and had the highest number of broods(3.0±1.95).The rate of egg production(a),the intrinsic rate of increase(r_m),net reproduction rate(R_0),and finite rate of increase(λ) were highest for D.tibetana reared at 5 and 10 mg/L lithium,and the duration of development was shorter than for the remaining groups.The results indicated that rearing in 5-10 mg/L lithium can accelerate the growth and reproduction of D.tibetana.
