Syringophilid Quill Mites Obey Harrison’s Rule

Diversity Pub Date : 2024-08-29 DOI:10.3390/d16090516
Lajos Rózsa, Mónika Ianculescu, Martin Hromada
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Abstract

Harrison’s Rule (HR) postulates a positive allometry between host and parasite body sizes. We tested HR for Syringophilid quill mites parasitizing birds. Using host body mass and parasite body length as size indices, this pattern was absent in the Syringophilidae family and the Syringophilinae subfamily as a whole. However, when considering the parasite genera as units of study, as proposed originally by Harrison, we found that host body mass positively correlates with both male and female parasite body length in seven genera (Aulobia, Aulonastus, Neoaulonastus, Picobia, Neopicobia, Syringophilopsis, and Torotrogla). Most of these relationships were non-significant. On the contrary, male and female Syringophiloidus mites exhibited negative relationships with host mass (both non-significant). This apparent contradiction disappeared when we applied wing length as an index of host body size. Since species of this genus are specific to the host flight feathers (secondaries and also primaries), wing length is a more meaningful index of host body size than body mass. Overall, most cases corresponded to the positive direction predicted by Harrison when examined on the genus level. This finding also implies a surprising reliability of the genus concept, at least in this group of ectoparasites.
嗜刺螨遵守哈里森规则
哈里森法则(Harrison's Rule,HR)假定宿主和寄生虫的体型之间存在正异构关系。我们对寄生于鸟类的鞘螨进行了HR测试。以宿主体重和寄生虫体长作为体型指数,鞘螨科和鞘螨亚科整体上不存在这种模式。然而,当按照 Harrison 最初的建议,将寄生虫属作为研究单位时,我们发现在七个属(Aulobia、Aulonastus、Neoaulonastus、Picobia、Neopicobia、Syringophilopsis 和 Torotrogla)中,宿主体重与雌雄寄生虫体长均呈正相关。这些关系大多不显著。相反,雌雄鞘螨与寄主质量呈负相关(均不显著)。当我们使用翅长作为寄主体型的指数时,这种明显的矛盾就消失了。由于该属的物种对寄主的飞行羽毛(副羽和主羽)具有特异性,因此翅长是比体重更有意义的寄主体型指标。总体而言,在属的层面上进行研究时,大多数情况都与 Harrison 预测的正方向一致。这一发现也意味着,至少在这一类体外寄生虫中,属的概念具有惊人的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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