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Female ixodid ticks grow endocuticle during the rapid phase of engorgement Open Access

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Author or creator
Flynn, P. C.
Kaufman, W. R.
Additional contributors
Subject/Keyword
Ixodid ticks
Cuticle systhesis
Rapid phase of engorgement
Amblyomma hebraeum
Ixodes ricinus
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: Lees (Proc Zool Soc Lond 121: 759-772, 1952) concluded that the ixodid tick Ixodes ricinus grows endocuticle during the slow but not during the rapid, phase of engorgement, a conclusion supported by Andersen and Roepstorff (Insect Biochem Mol Biol 35:1181-1188, 2005) for the same species. In this study analysis of dimensional data and cuticle weight measurements from female ixodid ticks (Amblyomma hebraeum) were used to test this hypothesis. Both approaches showed that endocuticle growth continues during the rapid phase, tapering to zero at a fed/unfed weight ratio of similar to 60. Of the total mass of cuticle in the engorged tick 32-43% was formed during the rapid phase. We demonstrate that if cuticle growth stopped at the end of the slow phase, there would not be sufficient cuticle to account for the thickness of cuticle observed at the end of engorgement. This finding is consistent with prior studies of Rhipicephalus (Boophilus) microplus, and with a dimensional analysis of the cuticle thickness data of Lees for I. ricinus, in contradiction to his conclusion from an analysis of tick cuticle weight measurements. An examination of cuticle weight measurements for I. ricinus by Andersen and Roepstorff similarly supports the finding of cuticle growth during the rapid phase. All ixodid ticks undergo major body expansion, typically tenfold or more, during a rapid phase of engorgement and require sufficient cuticle at the end of that process to contain their body. The fact that cuticle grows during the rapid phase of engorgement in three species suggests that this is a general characteristic of the family Ixodidae.
Date created
2010
DOI
doi:10.7939/R3D795C88
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© 2010 Springer Verlag. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited. The final publication is available at link.springer.com.
Citation for previous publication
Flynn, P. C. & Kaufman, W. R. (2010). Female ixodid ticks grow endocuticle during the rapid phase of engorgement. Experimental and Applied Acarology 53: 167-178. (DOI 10.1007/s10493-010-9393-5)
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