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Silva Lusitana

versão impressa ISSN 0870-6352


BERKANI-GHALEM, Zohra; HALIMA, Hámi  e  BERKANI MOHAMED, Laïd. Variations in the dynamics of development of Varroa destructor populations from the effects of climate in northern Algeria. Silva Lus. [online]. 2013, vol.21, n.2, pp.219-234. ISSN 0870-6352.

This experiment is performed on the dynamics of the population of the ectoparasitic Varroa destructor in northern Algeria where there are climatic differences from north to south. Monthly observations were conducted from January 2010 to August 2012, in 18 colonies in three apiaries distributed throughout the northern strip of Algeria. Bee populations have not undergone any acaricide treatment. Our experiment is undertaken in the areas corresponding to the following three climatic regions: Mediterranean climate or wet Mitidja (CM), Continental semiarid highlands (CSA) and continental arid steppe (CA). The development of mite populations is studied taking into account the following parameters: natural mortality (M) rates infestations of adult bees (TIA) and infestation rate of brood (ICT). For natural mortality, there are significant differences between the years, there has been a significant change during the period from March to August with a maximum of infestation of 577, 494 and 373 respectively for Mitidja highlands and steppe, which decreases to cancel from September to February. The infection rate of bees (TIA) for the three types of climate is respectively: 6.13, 6.09 and 4.81%. It is the same for the maximum infestation rate of brood, which varies depending on the climate zone. Global values for the three ecosystems studied are as follows: 7.16% for Mitidja, 6.55% for the highlands and 5.39% for the steppe. These values decrease from humid to dry climate. Infection rates decreased significantly over time.

Palavras-chave : honeybee; Varroa destructor; population evolution; Apis mellifera intermissa; climate.

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