1. Introduction
The giant honey bee (
Apis dorsata F.) is an economically important crop pollinator in Pakistan, South Asia, and Southeast Asia [
1,
2,
3,
4,
5]. This honey bee inhabits the Asian tropics, where its colonies produce substantial honey and beeswax in a single, large comb [
1,
4]. In recent years, the number of colonies of this honey bee has markedly declined [
2]. The main reason for such a decline is the loss of nesting sources and traditional destructive methods of honey hunting. The latter practice involves smoking and burning colonies, which leads to comb destruction and large-scale bee mortality. It has been suggested that obtaining good-quality honey from
A. dorsata using traditional methods of honey harvesting was not a desirable technique [
6]. This honey-hunting practice leads to the mass destruction of colonies, thereby negatively impacting local pollination services. For the sustainability of pollination services and the safe honey harvest from this honey bee, proper domestication, handling, and conservation of this honey bee have become increasingly important. This necessity prompted the undertaking of these investigations.
This honey bee exhibits migratory behavior. Many colonies of this honey bee migrate seasonally, living in two or more rich forage areas in the course of each year [
7,
8,
9,
10,
11,
12]. In the semi-arid environments of Northwest India, the migratory swarms of this honey bee arrive in October/November, remain there to reproduce and form swarms, and then emigrate in mid-May [
2]. In the southernmost provinces in Vietnam, Minh Hai, Kien Giang and Hau Giang, which are west of the Mekong River,
A. dorsata migrates between mangrove forests on the coast and the swamp forests of
Melaleuca leucadendron farther inland, which seasonally produce much pollen and nectar [
1].
Recent reports have revealed that these honey bee colonies in the semi-arid environments of Northwest India make nests on the cliffs/projections of multi-story buildings and the branches of tall trees. This honey bee has some fixed preferences for many nesting alternatives, including a preference for the nesting place/site, the height of the nesting site, and the direction of the nest. These parameters seemed to play a decisive role in the selection of the source and the site for nesting [
13]. For example,
A. dorsata prefers smooth surfaces over uneven ones for nesting. The majority of colonies nest at heights between 14 and 17 m on supports with an inclination from 0° to 45°, orient their nests in an east–west direction and choose a site with relics of an abandoned nest. Most newly arrived swarm colonies construct nests measuring 100–120 cm in length and 30–50 cm in height. The basal thickness of the comb in the non-honey region is 2.04 ± 0.6 cm, while in the honey region, it is 5.7 ± 1.2 cm [
13].
This honey bee has long faced predation from humans, who employ destructive honey-hunting methods. Therefore, there is a need to develop a non-destructive method of honey hunting for this species. Not many reports are, however, available on the domestication and conservation of this honey bee. Rafter beekeeping with
A. dorsata is known in some southeastern countries [
14,
15,
16,
17,
18,
19]. However, this practice was conducted in areas where natural nesting sources for this honey bee are abundant. No such efforts have been made in areas where nesting sources of this honey bee have been depleted due to man-engineered activities. Some efforts have also been made towards the hiving of this honey bee [
6,
20] but with limited success. Some ‘attraction planks’ to capture migrating
A. dorsata swarms were also developed and tested in Southwest India [
6]. The researcher claimed that his device improved honey harvesting from this species; however, the method was never widely adopted.
The foregoing information clearly reveals that this honey bee is a key provider of honey, beeswax, and pollination services in areas of its natural habitat. Ensuring the continued availability of these services requires the domestication and conservation of this species. This study was conducted with the following four objectives: (i) examining the role of the giant honey bee (A. dorsata) as a crop pollinator, (ii) testing nesting devices for attracting and domesticating its migratory swarms, (iii) developing its safe handling methods, and (iv) evaluating its potential for honey and beeswax production.
2. Material and Methods
This study took place at the College of Basic Sciences and Humanities, Haryana Agricultural University, Hisar, India (
Figure 1), where different types of observations on
A. dorsata were documented and listed in the following subchapters.
2.1. Apis dorsata as a Pollinator of Crops
Year-round surveys have been conducted over the past 40 years (1984–2024) to identify the crop plants visited by
A. dorsata foragers in Hisar, India. Foraging behavior was recorded using established methods [
21,
22]. It was assessed whether the foragers functioned as pollinators or nectar thieves on the flowers they visited. Based on these observations, their contribution to regional pollination services was evaluated.
2.2. Trials for Domestication and Conservation of A. dorsata
The primary nesting sources of A. dorsata in the study region were identified. Drawing on previous research [
13], nesting planks made from Acacia nilotica wood were designed and built, measuring 1 m in length, 15 cm in width, and 0.5 m in depth (
Figure 2). Molten beeswax was applied to the underside of the treated planks, while control planks were left uncoated (
Figure 2).
These planks were hung before the arrival of swarms from the eaves of the building of the College of Basic Sciences and Humanities, Haryana Agricultural University (Hisar, India), using thin iron wires (
Figure 3). These planks were subjected to the following four treatments before testing:
- (i)
Planks treated with beeswax loosely tied to the building eaves.
- (ii)
Planks treated with beeswax tightly tied to the building eaves.
- (iii)
Untreated planks loosely tied to the building eaves.
- (iv)
Untreated planks tightly tied to the building eaves.
The planks were hung in the preferred direction and height before the arrival of migratory swarms of
A. dorsata in this region [
13]. Each treatment was replicated four times (four planks were used for each treatment), and the experiment ran for 10 years (1984 to 1993). Therefore, each treatment had 40 replications during those 10 years. The acceptance of the wooden planks was confirmed on the basis of their occupancy by the migratory swarm colonies of the giant honey bee (
A. dorsata).
2.3. Occupation and Re-Occupation Indices
Six nesting sites were selected to test the preferred locations for migratory swarms of A. dorsata. On each site, one beeswax-treated plank was hung and tightly tied to the building’s projection in 1994, and the experiment continued until 2012 (for 19 years).
The occupation and re-occupation indices were determined by the following equations:
where
OI = Occupation index.
n = Number of years when the plank was available for the first occupation.
N = Number of years when the plank was actually occupied.
where
ROI = Re-occupation index.
m = Number of times when the plank was utilized for re-occupation.
M = Number of times when the plank was actually available for re-occupation.
2.4. Trials for Handling and Taming of A. dorsata Colonies
These trials were performed on a bright day using colonies of this honey bee that had already settled on the artificial nesting planks. Two kinds of trials were performed, and the aggressive response of the colonies was tested in the following two ways:
2.4.1. Pre-Handling Disturbance Trials
This experiment started on colonies after a month of their settlement on the nesting planks. In this experiment, colonies were divided into two groups: (i) periodically disturbed colonies and (ii) undisturbed (control) colonies. Periodic disturbance to the colonies occurred at a 10-day interval (i.e., first on the 40th, second on the 50th, third on the 60th, fourth on the 70th, and fifth on the 80th day after settlement). The same five colonies were repeatedly subjected to the disturbance treatment. However, the control colonies did not receive any disturbance before handling, and every time fresh colonies were selected for this purpose. In the control colonies, an aggressive response was recorded after the 40th day in five colonies, after the 50th day in another five colonies, and so on. This trial could not be completed in the same year due to the limited number of colonies, and the experiment was extended over multiple years. The disturbance to the colonies was caused by loosening the wire of the planks carrying the colonies, waving them gently up and down and to and fro in all directions, giving them minor jerks, and going near these colonies. The final aggressive response of the two types of colonies was recorded when approaching the colony and physically touching the curtain of bees on the comb. The intensity of aggressiveness of the two types of experimental colonies was recorded, as shown in
Table 1.
2.4.2. Pre-Handling Taming Trials
In these trials, the colonies were divided into four groups: (i) smoke-treated colonies, (ii) water-treated colonies, (iii) sham-treated colonies, and (iv) untreated (control) colonies. For the smoke treatment, 15–20 gentle puffs of smoke were applied to the experimental colonies using a smoker. Jute cloth was burned in the smoker to produce smoke. In the water-treated colonies, normal clean water at room temperature was sprayed on the two faces of the colony using a one-liter hand sprayer with a fine nozzle. The sham treatment was given by gently making 15–20 air puffs on the colonies. The control colonies did not receive any taming treatment. Two types of colonies were selected for this experiment: the undisturbed colonies and previously disturbed colonies. For these trials, the colonies were lowered to chest height, and precautions were taken to minimize disturbances aside from the experimental treatments. The aggressive responses of the colonies subjected to the four treatments were recorded (see
Table 1).
2.5. Utilization of the Attracted A. dorsata for Honey and Beeswax Production and for Live Studies
A method was developed to use colonies of
A. dorsata that had been attracted and tamed for honey and beeswax production, as well as for live studies. For this purpose, the colonies were periodically disturbed, as described in
Section 2.4.1. Afterward, the colonies were brought down and suitably tamed following the procedures outlined in
Section 2.4.2. The honey portion of the comb was then manually excised using a knife. The excised honeycomb was subsequently squeezed by hand to extract the honey. Beeswax was then recovered from the abandoned combs using conventional methods (
Figure 4 and
Figure 5). In total, honey and beeswax production from 10 domesticated colonies was recorded. The potential of this species to produce honey and beeswax was assessed. The attracted colonies were also used for live studies of this honey bee [
2,
13].
2.6. Statistical Analysis
For the domestication trials, no statistical tests were required [
23]. However, for the handling and taming trials, an unpaired
t-test [
24] and one-way ANOVA [
25] were used, as appropriate, to find differences between trials.
4. Discussion
Apis dorsata is a vital part of the local pollination service because it has been documented as a dependable pollinator of over 30 crops cultivated in this area (
Table 2). This honey bee produces a considerable amount of honey and beeswax (
Table 7). No prior study has provided clear evidence for these characteristics of this honey bee. In recent times, the populations of this honey bee have decreased significantly due to the substantial loss of its nesting sources [
2]. Thus, it is now absolutely necessary to conserve this honey bee. However, the conservation efforts must be coordinated with the migratory and nesting habits of this honey bee.
In India’s northwestern region,
A. dorsata migrations are seasonal. Arriving in October or November, the honey bee colonies remain in this area throughout the autumn, winter, and spring before leaving in the summer [
2]. These colonies construct their nests on the eaves of tall buildings and trees [
13], as they do elsewhere [
26,
27,
28]. In the past, many attempts were made to harvest the honey potential of this honey bee, mostly in the field of rafter beekeeping [
14,
15,
16,
17,
18,
19]. The majority of these attempts involved installing rafters on trees to serve as nesting sites for this honey bee. This strategy has become ineffective in areas where the natural nesting resources (tall trees) of this honey bee have been significantly removed [
2]. The regeneration or restoration of these could take an extended period. Tall buildings can provide potential nesting sites during this period. Because of this, the nesting planks were hung on the building eaves at ideal heights and possible locations. For their acceptance, two criteria must be combined. These include: (i) the hanging plank’s underside is beeswax-coated, and (ii) the plank is perfectly aligned with the building projection’s surface. Despite their moderate acceptance, these efforts appeared to be rationally justified (
Table 3). Furthermore, this study shows that this honey bee does not find all nesting sites equally appealing, and when given the option, it prefers some sites over others (
Table 4). Therefore, before starting extensive beekeeping operations with this honey bee, initial efforts should be focused on identifying preferred sites for attracting migratory swarms.
Although this honey bee is used in rafter beekeeping, no efforts were made to attract and tame the colonies, and very little work was conducted to domesticate it [
6,
20]. This research provides methods for (i) attracting the migratory swarms of this honey bee to the nesting planks suspended from tall building projections and (ii) taming the colonies to lessen their aggressive behavior, getting close to them, and handling them gently for non-destructive honey harvesting and scientific research on the live colonies. Thus, the information this investigation provides is new to science. This research will open a new era of beekeeping with this honey bee for honey and beeswax production and the sustainability of pollination services in the areas of its natural habitat.