Thomas F, Verneau O, Santalla F, Cézilly F, Renaud F
Laboratoire de Parasitologie Comparée (UMR 5555, CNRS), Université Montpellier II, France.
Int J Parasitol. 1996 Nov;26(11):1205-9. doi: 10.1016/s0020-7519(96)00114-2.
Following the behavioural alterations induced by the trematode Microphallus papillorobustus Rankin 1940 (Trematoda, Microphallidae) on its second intermediate host, the amphipod Gammmarus insensibilis, infected individuals are likely to mate among themselves. We investigated the influence of parasite intensity on the reproductive biology of infected hosts. In the mating system of amphipods, males compete severely for access to females and large males have greater ability to obtain large and more fecund females. We showed that the null hypothesis of random pair formation according to parasite intensity could not be rejected. In addition, infected males obtained females of the expected size according to their own sizes, whatever their parasite intensities. However, in both males and females, the parasite intensity increased the intermoult duration. Because size and reproductive success are strongly correlated in amphipods, we discuss the influence of this process on host fitness.
在1940年由吸虫微小阴茎微睾吸虫（扁形动物门，微睾科）对其第二中间宿主——无感知钩虾所诱导的行为改变之后，受感染的个体很可能会在彼此之间进行交配。我们研究了寄生虫感染强度对受感染宿主生殖生物学的影响。在钩虾的交配系统中，雄性为获得与雌性交配的机会而激烈竞争，体型较大的雄性有更强的能力获得体型更大、繁殖力更强的雌性。我们表明，根据寄生虫感染强度随机配对的零假设不能被拒绝。此外，无论感染强度如何，受感染的雄性根据自身大小获得了预期大小的雌性。然而，在雄性和雌性中，寄生虫感染强度都增加了蜕皮间期的持续时间。由于在钩虾中体型与繁殖成功率密切相关，我们讨论了这一过程对宿主适应性的影响。
