Fecundity compensation in the three-spined stickleback Gasterosteus aculeatus infected by the diphyllobothriidean cestode Schistocephalus solidus
Fecundity compensation in the three-spined stickleback Gasterosteus aculeatus infected by the diphyllobothriidean cestode Schistocephalus solidus
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DOI：
10.1111/j.1095-8312.2012.01907.x
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发表时间：
2012-08-01
影响因子：
1.9
通讯作者：
Heins, David C.
中科院分区：
文献类型：
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作者：
Heins, David C.
对寄生影响宿主生殖表型的原因解释可归纳为三种广泛的进化模型：（1）非适应性副作用;（2）适应性寄生操纵;（3）适应性宿主防御。本研究表明，繁殖力补偿，适应性非免疫宿主防御，在三棘鱼（Gasterosteus aculeatus）感染diphyllobothriidean绦虫Schistocephalus solidus。感染和未感染的雌性棘鱼在相同的年龄和大小产生卵窝。感染的女性生殖能力迅速下降，增加寄生虫：宿主体重比。身体状况较低，感染的女性比未感染的女性，并随着寄生虫：主机质量比的增加而下降。与离合器的女性有更大的身体状况比那些没有离合器。一个点的双稳态相关表明，有一个身体条件阈值离合器生产发生所需的。寄主雌性显然有能力产生卵窝，直到寄生虫窃取营养的长期影响和生殖资源的流失排除了离合器的形成。离合器质量，调整女性体重，感染和未感染的女性之间没有显着差异。感染的女性显然保持相同的水平的生殖分配（卵质量的身体质量的比例）作为未感染的女性。感染的女性产生较大的离合器较小的鸡蛋比未感染的女性，揭示了蛋质量和鸡蛋数量之间的权衡，符合生育力补偿假说。随着感染的严重程度，生殖能力的迅速丧失可能反映了寄生虫的影响，以及宿主当前和未来生殖之间的权衡。生殖性能的年际差异可能反映了生态对宿主病理学和/或年内季节性变化的影响。(c)伦敦林奈学会，林奈学会生物学杂志，2012，，。
Causal explanations for host reproductive phenotypes influenced by parasitism fit into three broad evolutionary models: (1) non-adaptive side effect; (2) adaptive parasitic manipulation; and (3) adaptive host defence. This study demonstrates fecundity compensation, an adaptive non-immunological host defence, in the three-spined stickleback fish (Gasterosteus aculeatus) infected by the diphyllobothriidean cestode Schistocephalus solidus. Both infected and uninfected female sticklebacks produced egg clutches at the same age and size. The reproductive capacity of infected females decreased rapidly with increased parasite : host body mass ratio. Body condition was lower in infected females than uninfected females and decreased with increasing parasite : host mass ratio. Females with clutches had greater body condition than those without clutches. A point biserial correlation showed that there was a body condition threshold necessary for clutch production to occur. Host females apparently had the capacity to produce egg clutches until the prolonged effects of nutrient theft by the parasite and the drain on resources from reproduction precluded clutch formation. Clutch mass, adjusted for female body mass, did not differ significantly between infected and uninfected females. Infected females apparently maintained the same level of reproductive allotment (egg mass as proportion of body mass) as uninfected females. Infected females produced larger clutches of smaller eggs than uninfected females, revealing a trade-off between egg mass and egg number, consistent with the fecundity compensation hypothesis. The rapid loss of reproductive capacity with severity of infection probably reflects the influence of the parasite combined with a trade-off between current and future reproduction in the host. Inter-annual differences in reproductive performance may have reflected ecological influences on host pathology and/or intra-annual seasonal changes. (c) 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, , .