Towards a Sweeter Future

Towards a sweeter future Conserving the giant Asian honey bee in Peninsular Malaysia TEXT BY THOMAS S. KRAFT, VIVEK V. VENKATARAMAN, GREEN JOHN CHAN & DR. M. NAZIP SURATMAN IMAGES BY VIVEK V. VENKATARAMAN & GREEN JOHN CHAN ACROSS SOUTHEAST Asia, the arrival of a giant Asian honey bee (Apis dorsata) colony near one’s home or garden is regarded as a good luck omen (Oldr d Nanork 2009). And for good reason: these iconic insects, which form conspicuous semi-circular nests on the undersides of tree branches or rock ledges, are respected for the important services they provide to both humans and local forest ecosystems. The relationship between humans and A. dorsata is ancient, dating back potentially more than 40,000 years (Crane 1999). Despite the prominence of these iconic insects in the Asian landscape and their profound biological and cultural significance, however, little is known about A. dorsata, including the conservation status of populations in Peninsular Malaysia and beyond. Although insects tend to receive less attention than charismatic megafauna such as hornbills or tigers, it is crucial that basic information on these small but vital pollinators is collected before it is too late. At home up high The global distribution of A. dorsata stretches from Indonesia in the southeast to western India and Pakistan in the northwest (Hepburn and Radloff 2011), with 28 Malaysian Naturalist 2006). In Peninsular Malaysia, A. dorsata can be easily distinguished from the other honey bee species present, which include A. cerana, A. koschevnikovi, A. florea, and A. andreniformis. Spanning one metre or more in length, the nests are covered by layers of worker bees, with the honey and brood (young developing bees) located beneath. Their open nesting habit Above: a preference for tall trees with smooth contrasts with the cavity dwelling (living on Abandoned A. dorsata combs on the underside bark, few branches and little surrounding the inside of tree trunks or other enclosed of branches after a honey vegetation, such as towering tualang spaces) habits of some other Apis species, harvest (Koompassia excelsa) or dipterocarp including the economically important A. Left: Ladders are used to climb (family Dipterocarpaceae) trees. Shielded mellifera and A. cerana. tall rainforest trees to from predators at such great heights, retrieve A. dorsata honey aggregations of up to 200 nests can occur Defending the sweet life in a single tree (Starr et al. 1987, Oldroyd Because open nests are easily detected by et al. 2000). predators, A. dorsata is notoriously fierce in defence of its nest (Seeley et al. 1982). As very large honey bees, A. dorsata needs Like other honey bees, A. dorsata relies on a continuous supply of floral resources, stinging to deter vertebrate predators, such necessitating seasonal migration between as sun bears, honey buzzards, tree shrews habitats that may be up to 200km apart and humans. Worker bees die in the process, (Koeniger and Koeniger 1980). One of but in evolutionary terms, this is a small price the most fascinating aspects of these to pay for defending the nest. migrations is that the colonies return to the same trees, sometimes after a period A. dorsata also exhibits other unique of several years, long after the deaths of defensive behaviour. The approach of a worker bees with direct memory of the predatory wasp (Vespa spp.) or honey old nesting site (Neumann et al. 2000). buzzard (Pernis ptylorhynchos) can elicit a Returning colonies may even seek out and “shimmering” response in which workers on nest upon the buildings that have been the surface of the hive rear their abdomens constructed using wood from their felled in a coordinated wave-like motion, a home tree (Oldroyd and Nanork 2009). behaviour which repels and creates confusion among predators (Kastberger et al. As the common name “giant Asian honey 2008). If a predatory wasp is caught by bee” suggests, A. dorsata is one of the guard bees, A. dorsata can kill the intruder largest honey bee species on earth, with using a technique called “heat-balling”, individual workers weighing around 120mg whereby a mob of bees forms a tight cluster (wing length: 16.5-17.5mm) and colonies around the wasp and heats it to death by containing almost 40,000 bees (Dyer generating heat with their flight muscles and Seeley 1991, Oldroyd and Wongsiri (Ken et al. 2005). DECEMBER 2014 29 More than honey attention that is normally reserved for Honey bees use the nectar of flowers to charismatic vertebrates” (Corlett 2011). produce honey, which is one of the sweetest and most energy-dense foods in nature. Two prominent honey bee researchers, Perhaps for this reason, humans have valued Benjamin Oldroyd and Piyamas Nanork, honey bees since prehistoric recently outlined the conservation times. More than that, in the status of Asian honey bees in a process of visiting many flowers In the process scientific journal article (Oldroyd sequentially, honey bees act as key and Nanork 2009). In their pollinators by transporting pollen of visiting many startling review, they list 10 of and making it possible for plants to flowers sequentially, the major threats to conservation produce viable seeds. As a result, currently faced by Asian honey honey bees are necessary for the honey bees act as bees. Of these, the two gravest production of many important threats appear to be habitat agricultural crops including key pollinators by degradation and over-hunting. mangos, onions, apples, avocados, cucumbers and thousands of transporting pollen Homeless and hunted other species. Habitat degradation in Southeast and making it possible Asia has reached unprecedented Forest ecosystems are similarly levels. This region is projected reliant on pollinators. The for plants to produce to lose up to 75% of its original towering dipterocarp canopy viable seeds. forests and 42% of existing trees of Southeast Asia tend to biodiversity by the year 2100 flower at night and are adapted (Sodhi et al. 2004). Most to pollination by honey bees, particularly A. clearing of primary forest in Peninsular dorsata (Corlett 2011). Malaysia occurs during the harvest of lumber or to accommodate expanding oil Action calls are buzzing palm plantations. Oil palm plantations are Honey bees worldwide are currently essentially uninhabitable for most vertebrate experiencing a period of unprecedented and invertebrate species, including decline (Brown and Paxton 2009), with the honey bees (Fitzherbert et al. 2008). spread of diseases and parasites, widespread The destruction of tualang and other tall use of pesticides and agrochemicals, climate rainforest trees due to illegal logging will also change and low genetic diversity adversely affectA. dorsata implicated as causes (Potts et (Mardan 2007). al. 2010). The conservation of “Apis dorsata... honey bees, particularly the Moreover, while nests on rock European honey bee, A. mellifera, deserves the sort faces are generally safe from honey has received a great deal of hunters, the iconic limestone international attention in of conservation karsts dotting the southeast Asian recent years. landscape are threatened by mining attention that is operations which may further However, concerns about the normally reserved reduce suitable A. dorsata habitat conservation of Asian honey bees, (Clements et al. 2006). including A. dorsata, have lagged for charismatic behind because these species are Exploitation by honey hunters less well known. Conservationists vertebrates.” has also been strongly implicated and scientists are now focusing on in their decline (Oldroyd and these species in light of worrying – Richard Corlett Nanork 2009). The pressure on evidence of population declines wild A. dorsata populations by and increasing knowledge of the honey collectors has increased vital role these species play in maintaining dramatically, particularly due to consumer ecosystems. As the renowned tropical demand for wild honey, despite it being ecologist Richard Corlett writes, “Apis unremarkable in any measurable respect dorsata... deserves the sort of conservation compared to domestic honey. The frequency 30 Malaysian Naturalist and nature of harvesting practices also play an important role. During night harvests, for example, bees are burned off their nest and the entire comb may be removed, a practice which usually destroys the hive. Many Malaysians who have first- hand experience with honey bees are acutely aware of the decline of A. dorsata. Street vendors selling sugarcane juice report that 20 years ago their Asian honey bee conservation. First and Above: Freshly harvested A. carts were covered in bees, whereas now foremost, in the interest of providing dorsata honeycomb there are few. Honey collectors and traders suitable habitat for A. dorsata, the Below: protection of rainforest habitat is critical. Over-harvesting is also have reported decreasing rates of colony a threat to giant Asian return and reduced honey yields throughout And as others have noted, tualang trees, honey bees, but alteration to harvesting practices, Peninsular Malaysia (Mardan 2007). and large trees in general, deserve special such as harvesters Indigenous Orang Asli, for whom the ancient protection because of their profound using smoker tools and protective suits, could practice of honey hunting is of profound importance in A. dorsata habitat choice, inflict less damage to A. religious and economic value, report that A. mating, and migration behaviour. dorsata colonies dorsata abundance, along with wild honey Protection of

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