| Autor: |
BERKVENS, D. L., PEGRAM, R. G., BRANDT, J. R. A. |
| Zdroj: |
Medical & Veterinary Entomology; Jul1995, Vol. 9 Issue 3, p307-315, 9p |
| Abstrakt: |
. The diapausing behaviour of Rhipicephalus appendiculatus was studied under quasi-natural conditions in the Eastern Province of Zambia. Newly-moulted adults of ticks indigenous to the study area entered a behavioural diapause when exposed to daylengths below a critical photoperiod, provisionally a daylength between 11 h 20min and 11 h 45min. In the Eastern Province of Zambia the diapause was apparently not terminated by a long-day signal, but by a weakening of the photoperiodic maintenance of the diapause because of increasing age of the ticks. Adults of a reference stock indigenous to Kenya also entered a diapause when exposed to daylengths below the same threshold and maintained this diapause for the same length of time. Adults of a reference stock of Rhipicephalus zambeziensis indigenous to Zimbabwe did not enter a diapause when exposed to the same daylengths. The relevance of the findings is discussed in relation to the distributions of the two species. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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