We hypothesized that cyclopoids, being predators, have a stronger allelopathic influence than calanoids on life-history variables of herbivorous rotifers. To test this hypothesis, we quantified the allelopathic effects of conditioned medium obtained separately from males and females of a calanoid (Arctodiaptomus dorsalis) and a cyclopoid (Mesocyclops longisetus) on the life table demography of the rotifer Brachionus havanaensis. The conditioned medium of the male and female A. dorsalis and male M. longisetus caused a significant reduction (14–18%) in the life expectancy at birth of B. havanaensis. Gross and net reproductive rates of rotifers reduced significantly on the conditioned medium of male or female A. dorsalis; however, the conditioned medium from either sex of M. longisetus had no significant effect on these variables. The population growth rate, r, varied from 0.53 to 0.64 d⁻¹ depending on the treatment; the r was significantly lower when cultured on the conditioned medium from A. dorsalis (males or females) and female M. longisetus Contrary to our hypothesis, calanoid allelochemicals adversely affected the life history variables of rotifers more than those produced by the cyclopoids.

我们假设作为捕食者的 cyclopoids 对草食性轮虫的生活史变量具有比calanoids 更强的化感作用。为了验证这一假设，我们量化了从雄性和雌性的calanoid ( Arctodiaptomus dorsalis ) 和cyclopoid (Mesocyclops longisetus )中分别获得的条件培养基对轮虫Brachionus havanaensis的生命表人口统计学的化感作用。雄性和雌性A. dorsalis和雄性M. longisetus的条件培养基导致B. havanaensis出生时的预期寿命显着降低（14-18%）. 在雄性或雌性A. dorsalis条件培养基上轮虫的总繁殖率和净繁殖率显着降低；然而，来自M. longisetus任一性别的条件培养基对这些变量没有显着影响。种群增长率r在 0.53 到 0.64 d ^{-1 之间}变化，具体取决于处理；在来自A. dorsalis（雄性或雌性）和雌性M的条件培养基上培养时，r显着降低。longisetus与我们的假设相反，calanoid 化感化学物质对轮虫的生活史变量的不利影响比对轮虫产生的影响更大。