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首页> 外文期刊>Journal of Parasitology >Castration of Female Ninespine Stickleback by the Pseudophyllidean Cestode Schistocephalus pungitii: Evolutionary Significance and Underlying Mechanism
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Castration of Female Ninespine Stickleback by the Pseudophyllidean Cestode Schistocephalus pungitii: Evolutionary Significance and Underlying Mechanism

机译：拟假单胞菌C虫血吸虫对女性Ninespine le的：割：进化的意义和潜在机制。

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摘要

Parasitic castration may result from manipulation of host energy allocation away from reproduction, which should result in castration of lightly infected hosts as well as heavily infected ones. Castration also may result from nutrient theft alone, which incidentally influences host energy allocation to reproduction and should cause reproduction to end in heavily infected hosts. Although the pseudophyllidean cestode Schistocephalus pungitii is a castrator of ninespine stickleback fish (Pungitius pungitius), the cause and significance of castration remain unknown. We used predictions about reproductive capacity in lightly and heavily infected hosts and host size (age) at which castration occurs to address these questions. In Airolo Lake, Alaska, we found that inhibition of reproduction in ninespine stickleback occurs in small fish before the size (age) of sexual maturity and is not instantaneous. Castration was observed in lightly and heavily infected adult-size hosts. Infected fish do not reach the same size as uninfected fish, possibly because of growth inhibition or selective predation. Castration in infected adult-size female ninespine stickleback appears to be the result of adaptive manipulation of host energy allocation by the parasite, but it could result from an energy budget readily influenced by parasitism.
机译：寄生cast割可能是由于操纵宿主能量分配而不是繁殖造成的，这应导致cast割轻度感染的宿主和重度感染的宿主。 alone割也可能仅由于营养失窃而引起，它偶然影响宿主对生殖的能量分配，并应导致在感染严重的宿主中停止繁殖。尽管假叶lide头尾Sch血吸虫是九头刺stick鱼（Pungitius pungitius）的cast割者，但of割的原因和意义仍然未知。我们使用了有关轻度和重度感染宿主的生殖能力以及去势发生的宿主大小（年龄）的预测来解决这些问题。在阿拉斯加的艾罗洛湖中，我们发现，抑制小鳍鱼繁殖的性繁殖在性成熟的大小（年龄）之前发生在小鱼中，而不是瞬时的。在轻度和重度感染的成年宿主中观察到割。受感染的鱼不能达到未感染鱼的大小，这可能是由于生长抑制或选择性捕食所致。成年女性成年雌性九脊柱棘背割的去势似乎是寄生虫对宿主能量分配进行适应性调节的结果，但这可能是由于寄生虫容易影响的能量收支所致。

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