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Association of the native parasitic nematode Deladenus proximus with individuals and populations of the native woodwasp Sirex nigricornis
Agricultural and Forest Entomology ( IF 1.6 ) Pub Date : 2022-02-02 , DOI: 10.1111/afe.12487 Saskya Nouhuys 1, 2 , David C. Harris 1 , Fred M. Stephen 3 , Larry D. Galligan 3 , Ann E. Hajek 1
中文翻译：
本地寄生线虫 Deladenus proximus 与本地木蜂 Sirex nigroris 的个体和种群的关联
更新日期：2022-02-02
Agricultural and Forest Entomology ( IF 1.6 ) Pub Date : 2022-02-02 , DOI: 10.1111/afe.12487 Saskya Nouhuys 1, 2 , David C. Harris 1 , Fred M. Stephen 3 , Larry D. Galligan 3 , Ann E. Hajek 1
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- Parasitic stages of the North American native dimorphic nematode Deladenus proximus develop within larvae of the native North American siricid Sirex nigricornis and sterilize many of the eggs in adult females. Sirex nigricornis were reared from felled trees or trapped in Arkansas and Louisiana in 2017–2019 and parasitism by D. proximus was evaluated.
- Deladenus proximus parasitized 0.16–0.43 of S. nigricornis individuals, among sites and years. Parasitized males were smaller than healthy males, and more males were parasitized than females emerging from the same trees.
- Rate of parasitism increased with increasing S. nigricornis density per tree, and, as per tree density increased, so did the proportion that was male.
- Egg sterilization (woodwasp eggs killed and inhabited by nematodes) was partial, with an average proportion of 0.66–0.88 woodwasp eggs sterilized by D. proximus per female S. nigricornis, differing significantly by site. As the numbers of eggs in a female increased, the proportion of eggs sterilized declined.
- Comparing data from this study with others, a trend is reported for variable levels of egg sterilization in Sirex females, with 0 or 100% sterilization often occurring in novel host/parasite associations and partial (averages between 50% and 100%) sterilization occurring when host/parasite associations have co-evolved.
中文翻译：
本地寄生线虫 Deladenus proximus 与本地木蜂 Sirex nigroris 的个体和种群的关联
- 北美本地二态线虫Deladenus proximus的寄生阶段在北美本地西立克西瑞克斯黑角线虫的幼虫内发育，并对成年雌性的许多卵进行绝育。2017 年至 2019 年，黑角蜉蝣从砍伐的树木中饲养或被困在阿肯色州和路易斯安那州，并评估了D. proximus的寄生情况。
- Deladenus proximus在地点和年份之间寄生了 0.16-0.43 个黑角沙门氏菌个体。被寄生的雄性比健康的雄性小，被寄生的雄性多于从同一棵树上出现的雌性。
- 寄生率随着每棵树的黑角沙门氏菌密度的增加而增加，并且随着树木密度的增加，雄性的比例也随之增加。
- 卵绝育（被线虫杀死和栖息的木蜂卵）是部分的，每雌性黑角沙门氏菌平均有 0.66-0.88 个木蜂卵被D. proximus绝育，因地点而异。随着雌性卵子数量的增加，绝育卵子的比例下降。
- 将本研究的数据与其他研究数据进行比较，报告了Sirex雌性卵子绝育水平变化的趋势，0 或 100% 绝育通常发生在新的宿主/寄生虫关联中，部分绝育（平均在 50% 和 100% 之间）发生在宿主/寄生虫协会共同进化。
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