Diapause induction in adults of three Rhipicephalus appendiculatus stocks.
Newly-moulted adults of three Rhipicephalus appendiculatus stocks, originating from Kenya, Zambia and Zimbabwe, were kept in different photoperiods (12h:12h, 13h:11h and 14h:10h light:dark). The stock originating from Kenya showed almost no behavioural diapause in any of these day lengths, whereas virtually all individuals of the Zimbabwean stock entered a behavioural diapause irrespective of day length. Adults from the Eastern Province of Zambia, a transition zone between the multivoltine phenology in equatorial Africa and the univoltine in southern Africa, exhibited a photoperiod-dependent diapause response. The possible mechanisms of diapause regulation and their origin are discussed.
Madder
M
M
Prince Leopold Institute of Tropical Medicine, Department of Animal Health, Antwerp, Belgium. mmadder@itg.be
Speybroeck
N
N
Brandt
J
J
Berkvens
D
D
D000818:Animals; D016009:Chi-Square Distribution; D002980:Climate; D005260:Female; D007630:Kenya; D008297:Male; D017440:Photoperiod; D010865:Pilot Projects; D011817:Rabbits; D012044:Regression Analysis; D013987:Ticks / Q000502:physiology*; D015024:Zambia; D015030:Zimbabwe