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首页> 外文期刊>Parasitology >Comparative recruitment, morphology and reproduction of a generalist trematode, Dicrocoelium dendriticum, in three species of host
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Comparative recruitment, morphology and reproduction of a generalist trematode, Dicrocoelium dendriticum, in three species of host

机译：在三种寄主中比较普通的吸虫线虫Dicrocoelium dendriticum的募集，形态和繁殖

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摘要

Epidemiological rate parameters of host generalist parasites are difficult to estimate, especially in cases where variation in parasite performance can be attributed to host species. Such cases are likely common for generalist parasites of sympatric grazing mammals. In this study, we combined data from experimental exposures in cattle and sheep and natural infections in elk to compare the recruitment, morphology and reproduction of adult Dicrocoelium dendriticum, a generalist trematode that has emerged in sympatric grazing hosts in Cypress Hills Provincial Park, Alberta. Overall, there were no significant differences in the recruitment of metacercariae and in the pre-patency period of adults in experimentally exposed cattle and sheep. All flukes reached reproductive maturity and the degree of reproductive inequality between individual flukes within each infrapopulation was moderate and approximately equal among the three host species. Neither fluke size nor per capita fecundity was constrained by density dependence. Thus, fitness parameters associated with growth and reproduction were approximately equivalent among at least three species of definitive host, two of which are sympatric on pastures in this Park. The generalist life-history strategy of this trematode, which is known to extend to other stages of its life cycle, has likely contributed to its invasion history outside its native range in Europe.
机译：寄主通用寄生虫的流行病学速率参数很难估算，尤其是在寄生虫性能变化可能归因于寄主物种的情况下。这种情况对于同胞放牧哺乳动物的多面体寄生虫很常见。在这项研究中，我们结合了来自牛和羊的实验性暴露数据以及麋鹿的自然感染数据，以比较成年的吸虫成虫Dicrocoelium dendriticum的募集，形态和繁殖，这种吸虫在亚伯大赛普拉斯希尔斯省立公园的同胞放牧宿主中出现。总体而言，在实验暴露的牛和羊中，recruitment尾recruitment的募集和成年前的成年前没有显着差异。所有吸虫都达到了生殖成熟，并且在每个种群内各个吸虫之间的生殖不平等程度是中等的，并且在三个寄主物种中大约相等。密度依赖性既没有限制fl幸的规模，也没有限制人均生育能力。因此，与生长和繁殖相关的适应性参数在至少三种确定的寄主物种中大致相等，其中两种同养在该公园的牧场上。这种吸虫的通才生活史策略据传会延伸到生命周期的其他阶段，可能是其入侵历史超出了欧洲本土范围的原因。

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