Geographic variation in diapause response of adult Rhipicephalus appendiculatus ticks |
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Authors: | Madder Maxime Speybroeck Niko Brandt Jef Tirry Luc Hodek Ivo Berkvens Dirk |
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Institution: | (1) Department of Animal Health, Institute of Tropical Medicine, Nationalestraat 155, B-2000 Antwerp, Belgium;(2) Department of Crop Protection, Faculty of Agricultural and Applied Biological Sciences, Laboratory of Agrozoology, University of Ghent, Coupure Links, B-9000 Gent, Belgium;(3) Institute of Entomology, Department of Ecophysiology, Academy of Sciences, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic |
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Abstract: | Diapause in adults of the African brown ear tick Rhipicephalus appendiculatus is dependent on latitude and stock origin. Lower latitude populations, that is, those nearer the equator, show no diapause
response to long or short day exposure. Diapause response to short day lengths is found in higher latitude populations, further
south, and increases with increasing latitude. Nearly all individuals in the southernmost population, used in this study,
enter diapause under short and long day exposure which implies that the onset of diapause in this population is obligatory.
Diapause termination in higher latitude populations is induced by increasing photo period, further north, but still south
of the equator, diapause is terminated by ageing. The differences in diapausing behaviour of the different populations are
discussed in relation to their climatic conditions.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Diapause Life cycle Rhipicephalus appendiculatus Rhipicephalus zambeziensis Ticks |
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