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When a beetle is too small to carry phoretic mites? A case of hydrophilid beetles (Coleoptera: Hydrophilidae) and Uropoda orbicularis (Acari: Mesostigmata)

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Abstract:

The aim of our study was to determine the limit of a beetle’s body size below which it is not able to carry phoretic mites. We tested the hypothesis that body size of the carrier is the vital factor in selecting a host in mites with facultative and nonspecific phoresy. The study was conducted on beetles of the family Hydrophilidae and deutonymphs of the mite Uropoda orbicularis (Müller, 1776). Among 20 species of hydrophilids collected, only 7 carried deutonymphs. The smallest hydrophilids with body lengths below 2.32 mm did not carry deutonymphs. These were Cercyon analis (Paykull, 1798), Cercyon nigriceps (Marsham, 1802), Cercyon pygmaeus (Illiger, 1801), Cercyon terminatus (Marsham, 1802), Cryptopleurum crenatum (Kugelann, 1794), Cryptopleurum minutum (Fabricius, 1775), Cryptopleurum subtile Sharp, 1884, and Megasternum concinnum (Marsham, 1802). On the contrary, the largest beetles, of the genus Sphaeridium Fabricius, 1775, were most heavily and frequently occupied by phoretic deutonymphs. Most representatives of the genus Cercyon Leach, 1817 did not carry mites or had a very low mite burden. Our study indicates that beetle infestation by nonspecific phoretic mites is strongly influenced by beetle body size.

Keywords: Cercyon; Hydrophilidae; Sphaeridium; Uropoda orbicularis; acariens; carrier selection; mites; phoresy; phorésie; sélection de porteurs

Document Type: Research Article

DOI: https://doi.org/10.1139/z2012-005

Affiliations: 1: Department of Animal Taxonomy and Ecology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland. 2: Department of Systematic Zoology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland.

Publication date: 2012-03-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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