African meliponine bees (Hymenoptera: Apidae) maintained in man-made hives as potential hosts for the small hive beetle, Aethina tumida Murray (Coleoptera: Nitidulidae)

Abstract

Previous studies have shown that natural honeybee and bumble bee colonies are hosts of the small hive beetle (SHB) Aethina tumida, a pest of honeybee colonies in various regions of the world. Recent studies also reported the presence of SHBs in colonies of certain meliponine bee species. In this study, we investigated whether SHBs detect odors of African meliponine bees and their hive matrix components. We also compared the chemical profiles of the honeybee Apis mellifera scutellata and meliponine bee odors in order to identify common potential semiochemicals between the two bee species. We used dual-choice olfactometric assays to test the responses of adult male and female SHBs to intact colony odors from six meliponine bee species, namely Hypotrigona gribodoi, Meliponula ferruginea (black), M. ferruginea (reddish-brown), Plebeina hildbrandti, M. bocandei and M. lendiliana and their hive matrix components including pot honey, pot pollen, cerumen (involucrum) and propolis (batumen). We found that female SHBs responded more strongly to odors from intact colonies, pot honey and pollen from five out of the six species tested than male beetles. Chemical analysis identified several common components in colony odors emitted by both honeybees and a representative meliponine bee species, M. ferruginea (black). In particular, nine of these common components previously have been shown in honeybee volatiles to be semiochemicals for the SHB, suggesting that African meliponine bees can also serve as potential alternate hosts for the beetle. The implications of these results are discussed in the context of domesticating African meliponine bees in man-made hives for the pollination of crops.