destructor of Bees

(Post by Alicja Muir)

A summary cartier bracelets of the life and effects of Varroa destructor mites on Honeybees.

Many of you have probably heard about the Colony Collapse Disorder (CCD) plaguing apiaries around the world. But do you know what some possible causes are? One pest that can quickly devastate a hive is a mite called Varroa destructor. A pretty cartier replica good name for a parasite that is half the size of your head and likes to suck your internal juices out.

Up until the 1950s the Varroa mite was only found replica cartier in Southeast Asia where it was parasitizing Apis cerana (the Eastern Honeybee). This species of bee most likely evolved with the mite and has natural bracelets defences against it.  After the Second World War the mite was slowly (and of course, accidentally) dispersed worldwide. The only places where honeybees live replica cartier love bracelets and the Varroa mite does not are Australia and New Zealand. Apis mellifera (the European Honeybee) is virtually defenseless against Varroa and it is the species of honeybee used cartier bracelet
across North America and most of the world for honey production and crop pollination. Therefore, Varroa destructor is a huge problem for the world economy and food availability.

The female mites lay one male egg followed by up to four female eggs in a cell containing a pupating bee. The mites feed on the pupa within the capped cell. Adolescent and male mites remain within the cell in which they were born.  Adult female mites, however, operate quite differently. They prefer to attach to young worker bees and will feed on their hemolymph but research suggests that the main reason the mites attach is simply for transport to other brood cells and occasionally other hives. Young worker bees are known as nurse bees as they travel from brood cell to brood cell feeding the larvae. Based on observing the adult female mites’ behaviour, they can definitely tell how old a worker bee is. Scientists are not sure how the mites judge the age of an adult bee but their chemoreceptors are likely involved. Research shows that the older a worker bee gets the more of the pheromone geraniol she gives off.

The parasitic disease caused by a Varroa mite infestation is called varroosis. This mainly consists of a weakened fake cartier bracelet replica
immune system. The mites transmit Deformed Wing Virus (DWV) to larvae and pupae and when they immerge as adult bees they—you guessed it—have deformed wings. This is extremely detrimental to not only the bee itself but to the colony as a bee who cannot fly cannot gather food. DWV is one of 22 viruses often found in honeybee hives although it usually affects less than 10% of the population. Having a weakened immune system from mite parasitization makes a bee vulnerable to not only DWV but to bacteria as well.

In temperate climates most colonies would fail within two to three years without being treated for mites on a consistent basis. A huge percentage of wild Apis mellifera colonies, who lack the treatments provided by humans, have been wiped how much does a cartier bracelet cost
out. Common mite treatments range from things as simple as wire netting at the bottom of the bee hive which the mites fall through and land on a sticky board to synthetic chemicals sprayed directly onto the bees. The synthetic chemicals are effective but can leave residues within the bee products which are harvested and consumed hermes replica jewelry by people. No matter what treatment is used it is still human intervention. We as apiculturists cartier bracelets and a community that relies heavily on apiculture are stuck between a rock and a hard place as they say. On one hand, by continuing to treat for mites and other organisms that have detrimental effects on our honeybees, we prevent them from building up natural defences. On the other hand, we can stop treating them to try to allow them to build natural defences and watch the vast majority, if not all of them, die before being able to evolve.

There are so many unknowns surrounding the symbiosis between Varroa mites and honeybees. More replica cartier research needs to be done to determine the correct plan of action.

 

References

Rosenkranz P, Aumeier P, Ziegelmann B. 2010. Biology and control of Varroa destructor.Journal of Invertebrate Pathology 103:S96–S119. http://www.sciencedirect.com/science/article/pii/S0022201109001906

Sammataro D, Gerson U, Needham G. 2000. Parasitic Mites of Honey Bees: Life History, Implications, and Impact.Annual Review of Entomology 45:519–548. http://www.annualreviews.org/doi/abs/10.1146/annurev.ento.45.1.519

Yang X, Cox-Foster D. 2007. Effects of parasitization by Varroa destructor on survivorship and physiological traits of Apis mellifera in correlation with viral incidence and microbial challenge.Parasitology 134:405–412. http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=691000&fileId=S0031182006000710

 

Picture 1: Adult female mite on honey bee pupa

By Gilles San Martin from Namur, Belgium cartier bracelet of anastasia steele fifty
[CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons

Picture 2: Adult bee with Deformed Wing Virus

By Xolani90 – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=26406168