oa Journal of the Entomological Society of Southern Africa - Die ekologie van die malmier, Anoplolepis custodiens (Smith) (Hymenoptera: Formicidae), in die sentrale Oranje-Vrystaat - Die bogrondse aktiwiteitspeil van die werkers



The seasonal activity of the pugnacious ant, Anoplolepis custodiens (Smith). was studied in a paddock representative of the Central Orange Free State. The distribution in time of the number of workers active on the soil surface, tended towards the negative binomial. The insects were more active during spring and autumn than during summer and winter. The lowest activity was recorded in July, while the highest activity occurred during March. The influence of season on activity was further demonstrated by a significant relationship between activity on the one hand and rainfall, relative humidity and temperature on the other. A multiple regression equation was calculated which indicated that both air temperature and relative humidity had a highly significant influence on the activity of the ants. These two factors, however, were responsible for only about 40% of the total variation in the number of workers.


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