PMID: 12770177May 29, 2003Paper

The relationship between 'critical weight' and 20-hydroxyecdysone in the female ixodid tick, Amblyomma hebraeum

Journal of Insect Physiology
Brian L Weiss, W Reuben Kaufman

Abstract

THE FEEDING CYCLE OF ADULT FEMALE TICKS (ACARI: Ixodidae) is divided into preparatory, slow and rapid feeding phases. At the transition from slow to rapid feeding, Amblyomma hebraeum (Koch) females reach a 'critical weight' (CW; approx. 10x the unfed weight) that is characterized by several behavioural and physiological changes. Five of these changes were used as criteria to establish a more precise estimate of CW than we have to date. The CW as defined by re-attachment to the host was 9x the unfed weight, while for haemolymph ecdysteroid titre, salivary gland degeneration, ovary weight, oocyte length and oocyte vitellin content the CW was 10x, 10x, 12x, 12x and 13x, respectively. CW thus varies depending on the parameter measured. Although previous studies have established the influence of ecdysteroids on salivary gland degeneration and vitellogenesis, here we demonstrate a further effect of ecdysteroids: inhibiting re-attachment to the host.

References

Sep 1, 1979·Molecular and Cellular Endocrinology·S L SmithL I Gilbert
Apr 1, 1986·Experimental & Applied Acarology·W R KaufmanA E Noga
Apr 22, 1997·Proceedings. Biological Sciences·L O LomasH H Rees
Apr 25, 2000·Archives of Biochemistry and Biophysics·D R WilliamsH H Rees

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Citations

Jul 29, 2006·Experimental & Applied Acarology·M Claire ArrietaW Reuben Kaufman
May 29, 2003·Journal of Insect Physiology·Kevin J. Friesen, W Reuben Kaufman
Dec 8, 2005·Annual Review of Entomology·Daniel E Sonenshine
Apr 8, 2004·Proceedings of the National Academy of Sciences of the United States of America·Brian L Weiss, W Reuben Kaufman
Jun 3, 2008·Parasitology International·Karim Christina Scopinho FurquimMaria Izabel Camargo Mathias
Apr 10, 2012·Experimental Parasitology·Gislaine Cristina RomaMaria Izabel Camargo-Mathias
Feb 9, 2013·The Journal of Experimental Biology·Remil Linggatong GalayTetsuya Tanaka
Jun 18, 2021·Experimental & Applied Acarology·Mayinuer TuerdiJinlin Zhou
May 3, 2008·Veterinary Parasitology·Karim Christina Scopinho FurquimMaria Izabel Camargo Mathias

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