|Range of Apis florea|
The dwarf honey bee (or red dwarf honey bee), Apis florea, is one of two species of small, wild honey bees of southern and southeastern Asia. It has a much wider distribution than its sister species, Apis andreniformis.
These two species together comprise the subgenus Micrapis, and are the most primitive of the living species of Apis, reflected in their small colony size, and simple nest construction. The exposed single combs are built on branches of shrubs and small trees. The forager bees do not perform a gravity-oriented waggle dance on the vertical face of the comb to recruit nestmates as in the domesticated Apis mellifera and other species. Instead, they perform the dance on the horizontal upper surface where the comb wraps around the supporting branch. The dance is a straight run pointing directly to the source of pollen or nectar the forager has been visiting. In all other Apis species, the comb on which foragers dance is vertical, and the dance is not actually directed towards the food source.
Both the bees were generally identified as Apis florea, and most information collected about these bees is from before the 1990s. However, the distinctiveness of the two species A. florea and A. andreniformis was established unequivocally in the 1990s. A. florea is redder and old workers always have a red first abdomen (younger workers are paler in colour, as is the case in giant honey bees); A. andreniformis is generally darker and the first abdomen segment is completely black in old bees.
- 1 Taxonomy and Phylogeny
- 2 Description and Identification
- 3 Distribution and Habitat
- 4 Colony Cycle
- 5 Behavior
- 6 Ecology
- 7 References
Taxonomy and Phylogeny
Danish zoologist Johan Christian Fabricius first identified Apis florea in 1787, also known as the little or dwarf honey bee for its relatively smaller morphology. A. florea is a member of the Apis genus, which is Latin for “bee.” It is also of the Apidae family, which is a diverse family of bees including honey bees, orchid bees, bumble bees, stingless bees, cuckoo bees and carpenter bees. The name Florea is a personal name with a Romanian origin. A. florea are native to southeast Asia and therefore are one of the most primitive living species in this region. This suggests that honeybees originated in this region, with A. florea being one of the oldest ancestors; therefore its first appearance in phylogeny occurs before that of A. mellifera and A. cerena. This is inferred because A. mellifera most likely evolved from A. florea and then migrated to Europe where colonies are currently located. A. florea, a dwarf honeybee, is a sister species of Apis andreniformis. These sister species are the most ancient Honeybee lineage, most likely diverging in the Bartonian era.
Description and Identification
A. florea is smaller than the average bee. A colony builds a single, exposed comb usually on tree branches or shrubs. A. florea produce honey that is a commodity in Thailand and Cambodia. They are excellent pollinators. A. florea are mostly the color yellow, with the exception of the scutellum of workers, which tends to be black. A. florea have smaller wing spans than Apis andreniformis, its sister species. Drones carry a thumb-like bifurcation called the basitarsus, which is located two-thirds along the length of the tibia. The fimbriate lobe of A. florea has three protrusions. They sting using two stylet barbs.
Distribution and Habitat
A. florea spans the continents of Asia and Africa and is most commonly seen in Southeastern Asia (Thailand), China, and forested regions of the Middle East. A. florea reach a decision about a new nesting site via dancing. They decide on a site when the largest number of individuals dance in the direction of the new site. The workers use an auditory signal of piping to indicate a decision about a new site has been reached, with the top of the swarm lifting off into the air first, followed by the bottom of the swarm and then the middle reaching the air last, but all within one minute of the swarm’s initial lift off. Since dancing is a common mechanism of communicating about a new nesting site in both A. florea and A. mellifera, it is suggested that this form of nest site selection evolved in the common ancestor of Apis. However, A. florea do not re-evaluate a site before several individuals move to the new site like A. mellifera does. Instead, swarms travel to the new site as a group and leave to a new site if it is later discovered to be unsuitable. This makes searching for new sites a much faster process for A. florea, but not necessarily more efficient.
Apis Florea are found in southeastern Asian countries, especially in Thailand, Iran, Oman, India, Myanmar, and some part of china, Cambodia, and Vietnam. They live in forest habitat but they are also the tropical fruit crops pollinators in Thailand.  Apis Florea build exposed nests and it is always a single comb on a single branch. If they are building a new nest near to the old one, they salvage the wax from the old nest. Other species of honeybee do not return to the old nest to the salvage wax. This behavior is only observed in this species. Even within the species this behavior differs, the colonies that migrate less than 200 meters involve in the salvaging of the wax, but the colonies that migrate long distance do not return for the old wax.
The annual colony cycle of honeybees involves migration, swarming, and absconding. A. florea migrate seasonally from one habitat to another. This might increase colony fitness, as the honeybees search for new territories, resources, or a reduction in parasites. Once a colony has outgrown its hive space, it will reproduce via swarming. During warmer seasons like spring and summer, ambient temperatures allow honeybees to forage actively, and they will reproduce frequently. During the colder seasons of autumn and winter, colonies tend to reduce their colony size because they depend on food stores. Before swarming, the colony will build queen cells in order for virgin queens to rear young queens. Before the new queens emerge, the colony’s workers search for a new nesting site. Afterwards, the bees will choose who stays and who goes. Similar to absconding behavior, the old queen will swarm while the new queens prepare for emergence.
Breeding and Lifespan
In a single patriline, more workers are positively correlated with higher frequency of future drones. High mating frequency in A. florea has been evolutionarily selected for as observed in other members of the genus. The average lifespan of a drone is 15.6 days, ranging from 6-41 days. The queen has a much longer lifespan as to mate with as many drones as possible in her reproductive prime.  A. florea participate in polyandry, where policing mechanisms ensure that workers’ eggs are destroyed at twice the rate of queens’ eggs using oophagy. Thus, the queens’ eggs are marked as to avoid destruction by worker bees. Since this behavior is also observed in A. mellifera, this suggests that policing mechanism behaviors evolved before the divergence of the Apis genus.
A. florea eat primarily honey and nectar. Females who eat this diet become workers while individuals who eat the royal jelly grow to become queens. The more energy invested in the individual, therefore, leads to how it is differentiated into worker or queen bee. This must be an evolutionary advantage because investing the royal jelly in a future queen increases her reproductive fitness, while the worker bees eat a less nutritious diet and do not reproduce. This is a form of kin selection, as the worker bees protect the queen and her larvae from harm.
A. florea adopt the open-comb branch site as an information center for foraging.The branch platforms serves as a location for bee dancing that conveys important foraging information to other bees. A. florea prefer to live in the wild, rather than handled by man. They are commonly seen foraging near branches and small bushes. They mainly forage for pollen and nectar as food sources as well as water and safety from predators.  Their frequent foraging and long migration range displays their high degree of mobility. They tend to build combs at lower elevations, away from direct sunlight and on the peripheral side of plant branches. A. florea forage openly, unlike A. cerana that mostly forage in parts of the hive that are not visible. Dialect observed in A. florea does not correlate with foraging range. A. florea tend to have longer foraging durations when compared to other bees in this genus, perhaps because they require smaller territories at lower altitudes and build open-combs on branches or twigs. Their small size necessitates more time to forage for pollen or nectar because they have a limit on how much food they can carry. Therefore, it is worth the cost of foraging for a longer duration if it means gaining the benefit of a highly nutritious food source.
A. florea demonstrate aggressive behaviors when competing for territory because of their high pollen versatility in their food stores. Additionally, they compensate for their small size and limited flight range with more aggressive behavior since their flight range is also limited. This suggests that aggressive behavior is naturally selected for in A. florea because it facilitates defending food stores in a smaller territory.
When a queen mates, the sperm is transferred into the spermatheca directly. Specifically, A. florea females produce no mucus as a sign of mating, unlike A. mellifera queens. A. florea uses a clasper organ at the hind leg to hold the queen’s leg during mating. Anatomical studies support the hypothesis that A. florea mate via direct sperm transfer. A. florea queens typically mate with 3-4 males to insure that spermatozoa directly reach the spermatheca. Therefore, A. florea mate with fewer drones than A. mellifera due to the increased efficiency of direct sperm transfer employed by A. florea. A. mellifera queens mate with as many as 9 drones and simply deposit spermatozoa in the oviducts of the queen, where only 10% of spermatozoa reach the spermatheca. Thus, A. florea use the more energetically efficient method of sperm transfer, suggesting this species is more evolved than A. mellifera.
Defense against predators
A. florea show highly specific social defense mechanisms when they sense predators nearby. For instance, they typically display hissing and shimmering behavior, in addition to nesting amidst dense foliage to camouflage themselves from potential predators. A more poignant example is the specific behavioral response they exhibit against their predominant predator, the O. smaragdina weaver ant. When these ants are in close proximity, the bees produce and deposit sticky barriers to obstruct their path. The guard bees take cover at this sticky zone and start to alert other bees using specific hissing sounds with the goal of preventing full blown raids by the ants. Over time, more bees are recruited to contribute to this sticky zone barrier which reinforces their defense.
As social bees, A. florea require a mechanism of communication, especially when conveying important spatial information about foraging, including direction and distance. The time elapsed during the waggle phase when a dancer moves forward while shaking the abdomen from side to side indicates the distance to a site. The longer the waggle phase, the longer the distance to a site and vice versa. In order to indicate direction, A. florea workers orient the waggle phase in the direction of the site, while dancing on the crow of the nest or swarm. The precision of dance does not depend on the type of site i.e. nest sites or food patches. In other words, A. florea do not change the precision of the waggle dance to indicate a goal is a nest site or food patch, unlike A. mellifera, which do change precision when conveying information about food patches specifically. This suggests that A. florea do not prioritize nesting site nor food patch information by changing the precision of dance.
A. florea have two main interactions with humans: hunting and tourism. In Asia, there is widespread hunting of these bees because they are harmless to humans and they also have social and cultural significance to the two main religions in Asia: Hindu and Buddism. In Hindu culture, the honey from such bees represents “the blendedness of everything” and is served with other ingredients in a variety of traditional ceremonies. In Buddhist culture, gifting honey to fellow monks is considered equal to giving alms, one of the most expressive ways that one can reward a good deed. In addition to being widely hunted and holding high cultural value, honey hunting sites are considered tourist sites in places like Nepal. Increased deforestation due to industrialization has enhanced bee migration to areas which are less populated, thus human interaction is mainly limited to fairly rural regions of Asia.
Even in a single nest there is high genetic diversity among the Apis Florea bees. Since Honey bee queens are polygamous, strong genetic variability exists. The tendency of this species to perform certain tasks is dependent on this variation. For example fanning of the nest is done by specific colony, when the nest reaches a specific temperature threshold.
Division of Labor
Apis floreas’ younger individuals work within the nests performing maintenance while older individuals are responsible for protection and foraging. Some specific tasks like fanning of the comb to maintain a stable temperature are done by a specific colony, which is genetically motivated. This is completed by patrilines because diverse patrilines respond to a specific temperature threshold.
Aside from their small size, simple exposed nests and simplified dance language, the lifecycle and behaviour of this species is fairly similar to other species of Apis. Workers of A. florea, like those of the species A. mellifera, also engage in worker policing, a process where nonqueen eggs are removed from the hive.
Queenless A. florea colonies have been observed to merge with nearby queen-right A. florea colonies, suggesting workers are attracted to queen bee pheromones.
The main parasites of both A. andreniformis and A. florea belong to the mite genus Euvarroa. However, A. andreniformis is attacked by the species Euvarroa wongsirii, while Euvarroa sinhai preys on A. florea and colonies of imported A. mellifera. The two species of Euvarroa have morphological and biological differences: while E. wongsirii has a triangular body shape and a length of 47–54 μm, E. sinhai has a more circular shape and a length of 39–40 μm.
Apis florea can migrate to a variety of diverse locations due to human introduction or of their own volition. It poses a threat to native insects like Apis mellifera because they compete for the same resources.
The most dominant predators for Apis Florea are ants and other arthropods. Since A. florea use open-combs, they must protect their comb from the outside, specifically at site of a branch. They employ two lines of defense. The first is against any falling object like leaves or other debris. A. florea use the head-pushing technique to move obstructions. The second line of defense is against ants and other arthropods. They accomplish this by creating sticky or repellant barriers (see Defense against Predators). 
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