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Host body size and the abundance of chewing lice (Phthiraptera: Amblycera, Ischnocera) infesting eight owl species (Aves: Strigiformes) in Manitoba, Canada

  • Robert J. Lamb (a1) and Terry D. Galloway (a1)


Specimens (n = 508) of eight species of owl (Aves: Strigiformes) collected from 1994 to 2017 in Manitoba, Canada, were weighed and examined for chewing lice (Phthiraptera: Amblycera, Ischnocera). The relationship between host body mass and infestation by 12 species of lice was examined. Host body mass explained 52% (P = 0.03) of the variation in mean intensity of louse infestation among hosts, due primarily to a high abundance of lice on the heaviest owl species. The relationship was due to the mean intensity of lice, and neither species richness nor the prevalence of lice was related to host body mass. For individual louse species, the relationship was due primarily to Kurodaia acadicae Price and Beer, Kurodaia magna Emerson, and an undetermined species of Kurodaia Uchida (Phthiraptera: Menoponidae) (R2 = 0.997), but not the nine Strigiphilus Mjöberg (Phthiraptera: Philopteridae) species (R2 = 0.27). Louse intensity did not increase with body size for individual birds of any of the owl species. Mean intensity is expected to increase in proportion with the size, specifically the surface area, of the host. Why that relationship holds only for one louse genus, and not for the most abundant genus of lice on owls, and weakly compared with other families of birds, has yet to be determined.


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Subject editor: Rayda Krell



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Bush, A.O., Lafferty, K.D., Lotz, J.M., and Shostak, A.W. 1997. Parasitology meets ecology on its own terms: Margolis et al. revisited. Journal of Parasitology, 83: 575583.
Clay, T. 1977. The Strigiphilus cursitans group (Phthiraptera: Insecta). Records of the Queen Victoria Museum, 56: 14.
Clayton, D.H. 1990. Host specificity of Strigiphilus owl lice (Ischnocera: Philopteridae), with the description of new species and host associations. Journal of Medical Entomology, 27: 257265.
Clayton, D.H. and Drown, D.M. 2001. Critical evaluation of five methods for quantifying chewing lice (Insecta: Phthiraptera). Journal of Parasitology, 87: 12911300.
Clayton, D.H. and Price, R.D. 1984. Taxonomy of the Strigiphilus cursitans group (Ischnocera: Philopteridae), parasites of owls (Strigiformes). Annals of the Entomological Society of America, 77: 340363.
Clayton, D.H. and Walther, R.A. 2001. Influence of host ecology and morphology on the diversity of Neotropical bird lice. Oikos, 94: 455467.
Cotgreave, P. and Clayton, D. H. 1994. Comparative analysis of time spent grooming by birds in relation to parasite load. Behaviour, 131: 171187.
Durkin, E.S., Luong, L.T., and Bird, J. 2015. Mechanisms underlying parasite infection: influence of host body mass and age on chewing louse distribution among brown-headed cowbirds. Parasitology Research, 114: 41694174.
Galloway, T.D. and Lamb, R.J. 2014. Abundance and stability are species traits for four chewing lice (Phthiraptera: Menoponidae, Philopteridae) on feral pigeons, Columba livia Gmelin (Aves: Columbiformes: Columbidae). The Canadian Entomologist, 146: 444456.
Galloway, T.D. and Lamb, R.J. 2017. Abundance of chewing lice (Phthiraptera: Amblycera and Ischnocera) increases with the body size of their host woodpeckers and sapsuckers (Aves: Piciformes: Picidae) in Manitoba, Canada. The Canadian Entomologist, 149: 473481.
Galloway, T.D. and Lamb, R.J. 2019. Infestation parameters of chewing lice (Phthiraptera: Amblycera and Ischnocera) infesting owls (Aves: Strigidae) in Manitoba, Canada. The Canadian Entomologist. Available from
Institute for Bird Populations. 2014. Standardized 4- and 6-letter bird species codes [online]. Available from [accessed 6 July 2015].
Johnson, K.P. and Clayton, D.H. 2003. The biology, ecology, and evolution of chewing lice. In The chewing lice: world checklist and biological overview. Edited by Price, R.D., Hellenthal, R.A., Palma, R.L., Johnson, K.P., and Clayton, D.H.. Illinois Natural History Survey Special Publication 24. University of Illinois at Urbana-Champaign, Champaign, Urbana, Illinois, United States of America. Pp. 449476.
Lee, P.L.M. and Clayton, D.H. 1995. Population biology of swift (Apus apus) ectoparasites in relation to host reproductive success. Ecological Entomology, 20: 4350.
MacArthur, R.H. and Wilson, E.O. 1967. The theory of island biogeography. Princeton University Press. Princeton, New Jersey, United States of America.
Mironov, S.V. and Galloway, T.D. 2002. Four new species of feather mites (Acari: Analgoidea). The Canadian Entomologist, 134: 605618.
Price, R.D. and Beer, J.R. 1963. The Kurodaia (Mallophaga: Menoponidae) parasitic on the Strigiformes, with a key to the species of the genus. Annals of the Entomological Society of America, 56: 849857.
Richards, W.R. 1964. A short method for making balsam mounts of aphids and scale insects. The Canadian Entomologist, 96: 963966.
Rózsa, L. 1997a. Wing-feather mite (Acari: Proctophyllodidae) abundance correlates with body mass of passerine hosts: a comparative study. Canadian Journal of Zoology, 75: 15351539.
Rózsa, L. 1997b. Patterns in the abundance of avian lice (Phthiraptera: Amblycera, Ischnocera). Journal of Avian Biology, 28: 249254.
SYSTAT Software. 2009. SYSYAT 13, Statistics I. SYSTAT Software, Chicago, Illinois, United States of America.


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