زنبور عسل گونهای زنبور است که عسل میسازد. زنبور عسل این کار را با گردآوری شهد گلها در کندو انجام میدهد. در فارسی به زنبور عسل منگ، منج و مگس انگبین هم گفته میشود. زنبورهای هر کندو یکی از سه نوع زنبور ملکه، زنبور نر و زنبور کارگر هستند. زنبور عسل از حشرات اجتماعی است حتی اگر در خارج از کندو دارای غذای کافی باشد نمیتواند به تنهایی زندگی کند.
ملکه معمولاً مادر تمامی زنبورهای موجود در کندو است. جنسیت آن ماده بوده و مهمترین وظیفهاش تخمگذاری میباشد. ملکه در تاریکترین و محفوظترین نقطه کندو سکونت دارد و در اطراف این محل خانههای ویژهای برای محافظت از تخمها و نوزادان قرار گرفته. علاوه بر اینها سه تا ده خانه برای ملکههای جوان در نظر گرفته شده است. ملکه همانند روح کندو محسوب میشود و اگر ملکه را بردارند و جانشینی برای او وجود نداشته باشد بعد از سه یا چهار ساعت تمام کارهای کندو متوقف میشود و بعد از مدتی زنبورها بر اثر اندوه نداشتن ملکه نابود میگردند. ملکه از اواخر فروردین تا اواخر خرداد روزانه حدود ۱۵۰۰ تخم میگذارد. ملکهها و کارگرها از تخمهای لقاح شده و نرها از تخمهای غیر لقاح شده (هاپلودید) به وجود میآیند. طول بدن ملکه بسته به هر نژاد متفاوت میباشد. بالهای آن کوچک بوده و خرطوم آن توانایی جمع آوری شهد گلها را نداشته و در عوض دارای شکمی بزرگتر از مادههای کارگر بوده و به طور طبیعی بیش از ۵ سال میتواند زنده بماند. در زنبورداری تجاری به علت کاهش تخمریزی از سال دوم زندگی به بعد، بیش از دو سال از یک ملکه استفاده نمیشود. ملکه عسل در زمان شفیرگی گرده نمیخورد و بجای آن ژله رویال مصرف میکند و شفیرهای که از گرده تغذیه شود هیچگاه به ملکه تبدیل نشده و کارگر خواهد شد. ملکه تا آخر عمر توسط ژله رویال تولیدی کارگران تغذیه میشود.
زنبورهای نر در کندو تنها وظیفه بارور نمودن ملکه را دارند و تا میتوانند عسل میخورند و دارای نیش نمیباشند. دارای سر و بالهای بزرگ میباشند. توانایی جمعآوری شهد و گرده را نداشته و ۲۴ روز زنده میمانند.
زنبور نر در حجرههای بزرگتری نسبتبه زنبورهای کارگر پرورش مییابند. تخمهای بارورنشده ملکه به زنبور نر تبدیل میشوند.
جنسیت زنبورهای کارگر ماده بوده و بیشتر جمعیت کندو را تشکیل میدهند. طول بدن آنها ۹ میلیمتر میباشد. در یک کندوی قوی با بیش از ۱۰ قاب، حدود ۷۰ هزار زنبور کارگر وجود دارد. زنبورهای کارگر با اینکه ماده هستند توانایی بارور شدن ندارند. ولی در صورت نبودن ملکه در کندو میتوانند تخم ریزی کنند. که در زنبورداری ماده تخمگذار گفته میشود. که این تخمها به دلیل عقیم بودن زنبور کارگر به زنبور نر تبدیل میشود نیش زنبورهای ماده خاردار بوده و طول آن در حدود ۱ میلیمتر میباشد. به خاطر وجود همین خارها پس از نیش زدن و ورود زهر به بدن موجوداتی که ساختار گوشتی دارد نیش در پوست گیر کرده و موجب جدا شدن کیسه زهر از زنبور میشود. و پس از چند دقیقه زنبوری که نیش زده خواهد مرد. این باور اشتباه وجود دارد که زنبورها به صورت آگاهانه اقدام به نیش زدن میکنند و به عبارتی خود را فدا میکنند ولی زنبورها به هیچ وجه نمیدانند بعد از نیش زدن کیسه ی زهرشان پاره خواهد شد.
وظایف زنبورهای کارگر[ویرایش]
تعدادی از کارگران در هر ساعت شیره دویست تا سیصد گل را مکیده و به کندو میآورند و به مامور هاى حمل و نقل تحویل میدهند و آنها نیز عسل دریافت کرده را انبار میکنند. در ورودی لانه چندین زنبود پاسداری میکنند و مانع ورود حشرات بیگانه و غارتگر میشوند. در داخل کندو عدهای مامور نظافت هستند و فضولات زنبوران نر را که کاری جز خوردن عسل ندارند از کندو بیرون میبرند. چند زنبور هم با بال زدن پیوسته حرارت کندو را تعدیل و هوا را تهویه میکنند. پرستاران هم مواد غذایی را به نوزادان و ملکه میرسانند.
نوزادان پس از خروج از تخم بعد از طی دو مرحله به صورت زنبور کامل در میآیند. در مرحله اول به صورت کرمهای سفیدی هستندو در خانههای کوچکی به سر میبرند و پرستاران به آنها غذا میرسانند و پس از چند روز به صورت زنبورهایی در میآیند که هنوز کامل نشدهاند و به حالت خوابیده و خشک شده به سر میبرند (مانند حالت پروانه ابریشم در پیله) به این جهت غذا نمیخورند تا وقتی که به صورت حشره کامل درآیند.
زنبور عسل و باروری گلها[ویرایش]
برآورد میشود که زنبور عسل در تهیه و تولید یک سوم غذای بشری سهیم باشد. و این بدان معنی نیست که عسل یک سوم غذای بشری است، بلکه باید گفت که زنبور عسل نقش مهمی در باروری گیاهان دارد و اگر زنبور نبود چه بسا که در بسیاری از اوقات باروری گیاهان امکانپذیر نبود. زنبور عسل وقتی بر روی گلی مینشیند، دانههای گرده را از اندام نرینه گل (پرچم) با خود برمیدارد و هنگامی که به سوی گل دیگری میرود، با این دانههای گرده اندام مادینه گیاه (تخمدان) را بارور میسازد، وبنا به اظهارات اتحادیه ملی پرورش دهندگان زنبور عسل در فرانسه، زنبور عسل اقدام به تلقیح وباروری گل آفتابگردان و درختان سیب به میزان ۷۰٪ و توت فرنگی و گیلاس به میزان ۸۰٪ و درختان میوه دار کوچک به میزان ۹۰٪ و شبدر و یونجه بنفش به میزان ۱۰۰٪ مینماید و اگر زنبور عسل نباشد، میزان تولیدات گیاهی به شدت کاهش مییافت و بدین گونه قبل از این که به موضوع اهمیت تولید عسل بپردازیم، باید کمی واقع بین باشیم و دریابیم که زندگی ما بدون زنبور عسل بسیار دشوار میشد. باغداران و کشاورزان به خوبی از نقش زنبور عسل در باروری گیاهان و افزایش محصولات کشاورزی آگاه هستند و به همین علت هیچگاه در اجاره دادن باغهای خود به پرورش دهندگان زنبور عسل تردید نمیکنند وبدین وسیله سعی میکنند که میزان تولید محصولات خود را دوبرابر سازند.
بر اساس تحقیق که سال ۲۰۱۵ در دانشگاه نیویورک انجام شده تغییر اقلیمی کره زمین تاثیر ویرانگری بر جمعیت زنبور عسل در نیمکره شمالی گذاشته و موجب کاهش سریع جمعیت آنها شدهاست. در آمریکای شمالی این کاهش به بیش از ۹۰ درصد خواهد رسید.
For other uses, see Honey bee (disambiguation).
A honey bee (or honeybee), in contrast with the stingless honey bee, is any member of the genus Apis, primarily distinguished by the production and storage of honey and the construction of perennial, colonial nests from wax. Honey bees are the only extant members of the tribe Apini, all in the genus Apis. Currently, only seven species of honey bee are recognized, with a total of 44 subspecies, though historically, from six to eleven species have been recognized. Honey bees represent only a small fraction of the roughly 20,000 known species of bees. Some other types of related bees produce and store honey, but only members of the genus Apis are true honey bees. The study of honey bees is known as apiology.
Origin, systematics and distribution
Honey bees appear to have their center of origin in South and Southeast Asia (including the Philippines), as all the extant species except Apis mellifera are native to that region. Notably, living representatives of the earliest lineages to diverge (Apis florea and Apis andreniformis) have their center of origin there.
The first Apis bees appear in the fossil record at the Eocene–Oligocene boundary (34 mya), in European deposits. The origin of these prehistoric honey bees does not necessarily indicate Europe as the place of origin of the genus, only that the bees were present in Europe by that time. Few fossil deposits are known from South Asia, the suspected region of honey bee origin, and fewer still have been thoroughly studied.
No Apis species existed in the New World during human times before the introduction of A. mellifera by Europeans. Only one fossil species is documented from the New World, Apis nearctica, known from a single 14-million-year-old specimen from Nevada.
The close relatives of modern honey bees – e.g. bumblebees and stingless bees – are also social to some degree, and social behavior seems a plesiomorphic trait that predates the origin of the genus. Among the extant members of Apis, the more basal species make single, exposed combs, while the more recently evolved species nest in cavities and have multiple combs, which has greatly facilitated their domestication.
Most species have historically been cultured or at least exploited for honey and beeswax by humans indigenous to their native ranges. Only two of these species have been truly domesticated, one (A. mellifera) at least since the time of the building of the Egyptian pyramids, and only that species has been moved extensively beyond its native range.
Main article: Apis mellifera
The chromosome counts of female bees for the three clades are: Micrapis 2N = 16, Megapis 2N = 16, and Apis 2N = 32. Drones of all species have 1N chromosome counts. The genome of Apis has been mapped.
Drones (males) are produced from unfertilized eggs, so represent only the DNA of the queen that laid the eggs, i.e. have only a mother. Workers and queens (both female) result from fertilized eggs, so have both a mother and a father. A modified form of parthenogenesis controls sex differentiation. The sex allele is polymorphic, and so long as two different variants are present, a female bee results. If both sex alleles are identical, diploid drones are produced. Honey bees detect and destroy diploid drones after the eggs hatch.
Queens typically mate with multiple drones on more than one mating flight. Once mated, they lay eggs and fertilize them as needed from sperm stored in the spermatheca. Since the number of sex alleles is limited – about 18 are known in Apis – a queen will most likely mate with one or more drones having sex alleles identical with one of the sex alleles in the queen. The queen, then, typically produces a percentage of diploid drone eggs.
Apis florea and Apis andreniformis are small honey bees of southern and southeastern Asia. They make very small, exposed nests in trees and shrubs. Their stings are often incapable of penetrating human skin, so the hive and swarms can be handled with minimal protection. They occur largely sympatrically, though they are very distinct evolutionarily and are probably the result of allopatric speciation, their distribution later converging. Given that A. florea is more widely distributed and A. andreniformis is considerably more aggressive, honey is, if at all, usually harvested from the former only. They are the most ancient extant lineage of honey bees, maybe diverging in the Bartonian (some 40 million years ago or slightly later) from the other lineages, but do not seem to have diverged from each other a long time before the Neogene.
One species is recognized in the subgenus Megapis. It usually builds single or a few exposed combs on high tree limbs, on cliffs, and sometimes on buildings. They can be very fierce. Periodically robbed of their honey by human "honey hunters", colonies are easily capable of stinging a human being to death if provoked.
The eastern species include three or four species. The reddish Koschevnikov's bee (Apis koschevnikovi) from Borneo is well distinct; it probably derives from the first colonization of the island by cave-nesting honey bees. Apis cerana, the eastern honey bee proper, is the traditional honey bee of southern and eastern Asia, kept in hives in a similar fashion to A. mellifera, though on a much smaller and regionalised scale. It has not been possible yet to resolve its relationship to the Bornean A. c. nuluensis and Apis nigrocincta from the Philippines to satisfaction; the most recent hypothesis is that these are indeed distinct species, but that A. cerana is still paraphyletic, consisting of several good species.
A. mellifera, the most common domesticated species, was the third insect to have its genome mapped. It seems to have originated in eastern tropical Africa and spread from there to Northern Europe and eastwards into Asia to the Tien Shan range. It is variously called the European, western or common honey bee in different parts of the world. Many subspecies have adapted to the local geographic and climatic environments; in addition, hybrid strains, such as the Buckfast bee, have been bred. Behavior, color, and anatomy can be quite different from one subspecies or even strain to another.
Regarding phylogeny, this is the most enigmatic honey bee species. It seems to have diverged from its eastern relatives only during the Late Miocene. This would fit the hypothesis that the ancestral stock of cave-nesting honey bees was separated into the western group of East Africa and the eastern group of tropical Asia by desertification in the Middle East and adjacent regions, which caused declines of food plants and trees that provided nest sites, eventually causing gene flow to cease. The diversity of subspecies is probably the product of a largely Early Pleistocene radiation aided by climate and habitat changes during the last ice age. That the western honey bee has been intensively managed by humans for many millennia – including hybridization and introductions – has apparently increased the speed of its evolution and confounded the DNA sequence data to a point where little of substance can be said about the exact relationships of many A. mellifera subspecies.
Apis mellifera is not native to the Americas, so was not present upon the arrival of the European explorers and colonists. However, other native bee species were kept and traded by indigenous peoples. In 1622, European colonists brought the dark bee (A. m. mellifera) to the Americas, followed later by Italian bees (A. m. ligustica) and others. Many of the crops that depend on honey bees for pollination have also been imported since colonial times. Escaped swarms (known as "wild" bees, but actually feral) spread rapidly as far as the Great Plains, usually preceding the colonists. Honey bees did not naturally cross the Rocky Mountains; they were transported by the Mormon pioneers to Utah in the late 1840s, and by ship to California in the early 1850s.
Main article: Africanized bee
Africanized bees (known colloquially as "killer bees") are hybrids between European stock and one of the African subspecies A. m. scutellata; they are often more aggressive than European bees and do not create as much of a honey surplus, but are more resistant to disease and are better foragers. Originating by accident in Brazil, they have spread to North America and constitute a pest in some regions. However, these strains do not overwinter well, so are not often found in the colder, more northern parts of North America. The original breeding experiment for which the African bees were brought to Brazil in the first place has continued (though not as intended). Novel hybrid strains of domestic and redomesticated Africanized bees combine high resilience to tropical conditions and good yields. They are popular among beekeepers in Brazil.
Main article: Beekeeping
Two species of honey bee, A. mellifera and A. cerana indica, are often maintained, fed, and transported by beekeepers. Modern hives also enable beekeepers to transport bees, moving from field to field as the crop needs pollinating and allowing the beekeeper to charge for the pollination services they provide, revising the historical role of the self-employed beekeeper, and favoring large-scale commercial operations.
Colony collapse disorder
Main article: Colony collapse disorder
Beekeepers in Western countries have been reporting slow declines of stocks for many years, apparently due to impaired protein production, changes in agricultural practice, or unpredictable weather. In early 2007, abnormally high die-offs (30–70% of hives) of European honey bee colonies occurred in North America; such a decline seems unprecedented in recent history. This has been dubbed "colony collapse disorder" (CCD); it is unclear whether this is simply an accelerated phase of the general decline due to stochastically more adverse conditions in 2006, or a novel phenomenon. CCD is unique due to the lack of evidence as to what causes the sudden die-off of adult worker bees, as well as few to no dead bees found around the hive.
Research has so far failed to determine what causes it, but the weight of evidence is tentatively leaning towards CCD being a syndrome rather than a disease, as it seems to be caused by a combination of various contributing factors rather than a single pathogen or poison. However, in April 2013, after a report was released by the European Food Safety Authority identifying the significant risks of the class of pesticides called neonicotinoids, the European Union called for a two-year restriction on neonicotinoid pesticides.
A 2007 study linked CCD with Israeli acute paralysis virus at a level of statistic significance. IAPV was found in 83.3% of hives with CCD, and has a predictive value of 96.1%, making it one of the most probable candidates as the infectious agent in CCD.
One other possible hypothesis is that the bees are falling victim to a combination of insecticides and parasites. Feral honey bees are prone to high levels of deformed wing virus (DWV). The varroa mite thrives in honey bee colonies by sucking the hemolymph of honey bees, causing open wounds that are susceptible to varroosis. Higher levels of DWV are more prevalent in colonies that are not being treated for varroosis. Tobacco ring spot virus (TRSV) spreads and negatively affects the health of honey bees indirectly. TRSV has a wide host range. It can be transmitted from infected plant hosts, through parasites such as varroa mites, and ultimately infect insects like the honey bee. In January 2012, a researcher discovered Apocephalus borealis larvae, a parasitic fly known to prey on bumble bees and wasps, in a test tube containing a dead honey bee believed to have been affected by CCD.
No effective preventative measures against CCD have been suggested to date.
As in a few other types of eusocial bees, a colony generally contains one queen bee, a fertile female; seasonally up to a few thousand drone bees, or fertile males; and tens of thousands of sterile female worker bees. Details vary among the different species of honey bees, but common features include:
In cold climates, honey bees stop flying when the temperature drops below about 10°C (50°F) and crowd into the central area of the hive to form a "winter cluster". The worker bees huddle around the queen bee at the center of the cluster, shivering to keep the center between 27°C (81°F) at the start of winter (during the broodless period) and 34°C (93°F) once the queen resumes laying. The worker bees rotate through the cluster from the outside to the inside so that no bee gets too cold. The outside edges of the cluster stay at about 8–9°C (46–48°F). The colder the weather is outside, the more compact the cluster becomes. During winter, they consume their stored honey to produce body heat. The amount of honey consumed during the winter is a function of winter length and severity, but ranges in temperate climates from 15 to 50 kg (30 to 100 lb).
Species of Apis are generalist floral visitors, and pollinate a large variety of plants, but by no means all plants. Of all the honey bee species, only A. mellifera has been used extensively for commercial pollination of crops and other plants. The value of these pollination services is commonly measured in the billions of dollars. Bees collect 66 lb of pollen per year, per hive.
Main article: Honey
Honey is the complex substance made when the nectar and sweet deposits from plants and trees are gathered, modified, and stored in the honeycomb by honey bees as a food source for the colony. All living species of Apis have had their honey gathered by indigenous peoples for consumption, though for commercial purposes, only A. mellifera and A. cerana have been used to any degree. Honey is sometimes also gathered by humans from the nests of various stingless bees.
Main article: Nectar
Nectar, a liquid high in sucrose, is produced in plant glands known as nectaries. It is an important energy resource for honey bees and plays a significant role in foraging economics and evolutionary differentiation between different subspecies. It was proposed through an experiment conducted with the African honey bee, A. m. scutellata, that nectar temperature impacts the foraging decisions of honey bees.
Main article: Beeswax
Worker bees of a certain age secrete beeswax from a series of glands on their abdomens. They use the wax to form the walls and caps of the comb. As with honey, beeswax is gathered by humans for various purposes.
Main article: Bee pollen
Bees collect pollen in their pollen baskets and carry it back to the hive. In the hive, pollen is used as a protein source necessary during brood-rearing. In certain environments, excess pollen can be collected from the hives of A. mellifera and A. cerana. It is often eaten as a health supplement. It also has been used with moderate success as a source of pollen for hand pollination However, pollen collected by bees and harvested for pollination must be used within a few hours because it loses its potency rapidly, possibly because of the effects of enzymes or other chemicals from the bees.
Main article: Propolis
Propolis or bee glue is created from resins, balsams, and tree saps. Those species of honey bees that nest in tree cavities use propolis to seal cracks in the hive. Dwarf honey bees use propolis to defend against ants by coating the branch from which their nest is suspended to create a sticky moat. Propolis is consumed by humans as a health supplement in various ways and also used in some cosmetics.
Sexes and castes
A caste is a different form, morphologically or reproductively, within the same sex of a species. Honey bees have three castes: drones, workers, and queens. Drones are male, while workers and queens are female.
Males or drones are typically haploid, having only one set of chromosomes. They are produced by the queen if she chooses not to fertilize an egg; or by an unfertilized laying worker. Diploid drones may be produced if an egg is fertilized but is homozygous for the sex-determination allele. Drones take 24 days to develop and may be produced from summer through autumn. Drones have large eyes used to locate queens during mating flights. They do not have a sting.
Main article: Worker bee
Workers have two sets of chromosomes. They are produced from an egg that the queen has selectively fertilized from stored sperm. Workers typically develop in 21 days. A typical colony may contain as many as 60,000 worker bees. Workers exhibit a wider range of behaviors than either queens or drones. Their duties change upon the age of the bee in the following order (beginning with cleaning out their own cell after eating through their capped brood cell): feed brood, receive nectar, clean hive, guard duty, and foraging. Some workers engage in other specialized behaviors, such as "undertaking" (removing corpses of their nestmates from inside the hive).
Workers have morphological specializations, including the corbiculum or pollen basket, abdominal glands that produce beeswax, brood-feeding glands, and barbs on the sting. Under certain conditions (for example, if the colony becomes queenless), a worker may develop ovaries.
Main article: Queen bee
Queen honey bees are created at the decision of the worker bees by feeding a larva only royal jelly throughout its development, rather than switching from royal jelly to pollen once the larva grows past a certain size. Queens are produced in oversized cells and develop in only 16 days; they differ in morphology and behavior from worker bees. In addition to the greater size of the queen, she has a functional set of ovaries, and a spermatheca, which stores and maintains sperm after she has mated. The sting of queens is not barbed like a worker's sting, and queens lack the glands that produce beeswax. Once mated, queens may lay up to 2,000 eggs per day. They produce a variety of pheromones that regulate behavior of workers, and helps swarms track the queen's location during the migratory phase.
All honey bees live in colonies where the workers sting intruders as a form of defense, and alarmed bees release a pheromone that stimulates the attack response in other bees. The different species of honey bees are distinguished from all other bee species (and virtually all other Hymenoptera) by the possession of small barbs on the sting, but these barbs are found only in the worker bees. The sting and associated venom sac of honey bees are also modified so as to pull free of the body once lodged (autotomy), and the sting apparatus has its own musculature and ganglion, which allow it to keep delivering venom once detached. The worker dies after the sting becomes lodged and is subsequently torn loose from the bee's abdomen. The honey bee's venom, known as apitoxin, carries several active components, the most abundant of which is melittin, and the most destructive is phospholipase A2.
This complex apparatus, including the barbs on the sting, is thought to have evolved specifically in response to predation by vertebrates, as the barbs do not usually function (and the sting apparatus does not detach) unless the sting is embedded in fleshy tissue. While the sting can also penetrate the membranes between joints in the exoskeleton of other insects (and is used in fights between queens), in the case of Apis cerana japonica, defense against larger insects such as predatory wasps (e.g. Asian giant hornet) is usually performed by surrounding the intruder with a mass of defending worker bees, which vibrate their muscles vigorously to raise the temperature of the intruder to a lethal level. Previously, heat alone was thought to be responsible for killing intruding wasps, but recent experiments have demonstrated the increased temperature in combination with increased carbon dioxide levels within the ball produce the lethal effect. This phenomenon is also used to kill a queen perceived as intruding or defective, an action known to beekeepers as 'balling the queen', named for the ball of bees formed.
In the case of those honey bee species with open combs (e.g., A. dorsata), would-be predators are given a warning signal that takes the form of a "Mexican wave" that spreads as a ripple across a layer of bees densely packed on the surface of the comb when a threat is perceived, and consists of bees momentarily arching their bodies and flicking their wings.
Main article: Bee learning and communication
Honey bees are known to communicate through many different chemicals and odors, as is common in insects, but also using specific behaviours that convey information about the quality and type of resources in the environment, and where these resources are located. The details of the signalling being used vary from species to species; for example, the two smallest species, Apis andreniformis and A. florea, dance on the upper surface of the comb, which is horizontal (not vertical, as in other species), and worker bees orient the dance in the actual compass direction of the resource to which they are recruiting.
Main article: Bee (mythology)
Both the Atharva Veda and the ancient Greeks associated lips anointed with honey with the gift of eloquence and even of prescience. The priestess at Delphi was the "Delphic Bee". The Quran has a chapter titled "The Bee".
A community of honey bees has often been employed throughout history by political theorists as a model of human society: