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Jerzy Wilde - One of the best experts on this subject based on the ideXlab platform.
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grooming behavior by Worker Bees of various subspecies of honey Bees to remove varroa destructor mites
Journal of Apicultural Research, 2015Co-Authors: Beata Bąk, Jerzy WildeAbstract:Grooming behavior by honey Bees is regarded as an important trait that contributes to the defense against the parasitic mite Varroa destructor. We carried out an assay to investigate how effective autogrooming by honey Bees is in removing V. destructor mites. We compared the behavior of the Carniolan bee (Apis mellifera carnica), represented by two lines: Kortowka and Dobra; the Caucasian bee (Apis mellifera caucasica) of the Woźnica line; the black bee (Apis mellifera mellifera) of the Augustowska line; and the crossbreed of two subspecies: Apis mellifera capensis × A. m. carnica. We found that most Worker Bees do not tolerate the mite on their bodies. The most intense reaction, manifested by strong motor activity, was observed in A. m. mellifera Worker Bees; as many as 98% of Worker Bees in this group made an attempt to remove mites. In the remaining groups, a response was observed in 86% for Caucasian Bees to 89.3% for Carniolan Bees, Dobra line. The attempts made by Bees of different origins to remove...
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presence or absence of drones in drone dusk mass flights performed by apis dorsata forager Bees
Journal of Apicultural Research, 2007Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria Wilde, Muniswamyreddy Shankar Reddy, N Nagaraja, Venkatarame SivaramAbstract:SummaryApis dorsata drones perform dusk mass flights (DMF's) shortly after sunset. Bees performing DMF's were caught near the nests with insect nets. Presence of drones within captured Bees was determined and the colour of Worker Bees was examined to classify them in age-colour categories. A total of 15,160 individual Bees were examined. It was found that in the spring, drones were practically absent in arriving swarms. The percentage of drones, which participated in dusk mass flights, increased to 19% after the colonies stayed at the site for six weeks. A correlation was found between the duration of time the colonies stayed at the place and the percentage of drones, which performed those flights. In autumn, when environmental conditions deteriorated and the colonies migrated, drones were absent practically in all the colonies at the site. Of 4,450 Bees captured in autumn, only 2 drones were found during 30 DMF's performed by 7 colonies. Thus, Worker Bees performed ‘drone’ DMF's despite the absence of dr...
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temperature correlated dorso ventral abdomen flipping of apis laboriosa and apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa. Apis laboriosa / Apis dorsata / abdomen flapping / body movements / temperature correlation / Nepal
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Temperature correlated dorso-ventral abdomen flipping of Apis laboriosa and Apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa.
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Periodic mass flights of Apis laboriosa in Nepal
Apidologie, 2003Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:The investigations were conducted in the Himalayas in Nepal. Two cliff sites, one with 16 A. laboriosa nests and the other with 53 nests were observed. Together 120 periodic mass flights (PMF) performed by A. laboriosa Worker Bees during 8 days were recorded. Workers from $50-81\%$ of colonies performed PMF, during days of adequate weather conditions. The flights were not performed during overcast days. Worker Bees from different colonies perform PMF at different times of the day. Workers from the same colonies perform PMF at different times in subsequent days. While Workers from some colonies did not perform any PMF during several days, others perform 2 or 3 PMF per day.
Maria Wilde - One of the best experts on this subject based on the ideXlab platform.
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presence or absence of drones in drone dusk mass flights performed by apis dorsata forager Bees
Journal of Apicultural Research, 2007Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria Wilde, Muniswamyreddy Shankar Reddy, N Nagaraja, Venkatarame SivaramAbstract:SummaryApis dorsata drones perform dusk mass flights (DMF's) shortly after sunset. Bees performing DMF's were caught near the nests with insect nets. Presence of drones within captured Bees was determined and the colour of Worker Bees was examined to classify them in age-colour categories. A total of 15,160 individual Bees were examined. It was found that in the spring, drones were practically absent in arriving swarms. The percentage of drones, which participated in dusk mass flights, increased to 19% after the colonies stayed at the site for six weeks. A correlation was found between the duration of time the colonies stayed at the place and the percentage of drones, which performed those flights. In autumn, when environmental conditions deteriorated and the colonies migrated, drones were absent practically in all the colonies at the site. Of 4,450 Bees captured in autumn, only 2 drones were found during 30 DMF's performed by 7 colonies. Thus, Worker Bees performed ‘drone’ DMF's despite the absence of dr...
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temperature correlated dorso ventral abdomen flipping of apis laboriosa and apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa. Apis laboriosa / Apis dorsata / abdomen flapping / body movements / temperature correlation / Nepal
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Temperature correlated dorso-ventral abdomen flipping of Apis laboriosa and Apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa.
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Periodic mass flights of Apis laboriosa in Nepal
Apidologie, 2003Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:The investigations were conducted in the Himalayas in Nepal. Two cliff sites, one with 16 A. laboriosa nests and the other with 53 nests were observed. Together 120 periodic mass flights (PMF) performed by A. laboriosa Worker Bees during 8 days were recorded. Workers from $50-81\%$ of colonies performed PMF, during days of adequate weather conditions. The flights were not performed during overcast days. Worker Bees from different colonies perform PMF at different times of the day. Workers from the same colonies perform PMF at different times in subsequent days. While Workers from some colonies did not perform any PMF during several days, others perform 2 or 3 PMF per day.
Jerzy Woyke - One of the best experts on this subject based on the ideXlab platform.
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presence or absence of drones in drone dusk mass flights performed by apis dorsata forager Bees
Journal of Apicultural Research, 2007Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria Wilde, Muniswamyreddy Shankar Reddy, N Nagaraja, Venkatarame SivaramAbstract:SummaryApis dorsata drones perform dusk mass flights (DMF's) shortly after sunset. Bees performing DMF's were caught near the nests with insect nets. Presence of drones within captured Bees was determined and the colour of Worker Bees was examined to classify them in age-colour categories. A total of 15,160 individual Bees were examined. It was found that in the spring, drones were practically absent in arriving swarms. The percentage of drones, which participated in dusk mass flights, increased to 19% after the colonies stayed at the site for six weeks. A correlation was found between the duration of time the colonies stayed at the place and the percentage of drones, which performed those flights. In autumn, when environmental conditions deteriorated and the colonies migrated, drones were absent practically in all the colonies at the site. Of 4,450 Bees captured in autumn, only 2 drones were found during 30 DMF's performed by 7 colonies. Thus, Worker Bees performed ‘drone’ DMF's despite the absence of dr...
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temperature correlated dorso ventral abdomen flipping of apis laboriosa and apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa. Apis laboriosa / Apis dorsata / abdomen flapping / body movements / temperature correlation / Nepal
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Temperature correlated dorso-ventral abdomen flipping of Apis laboriosa and Apis dorsata Worker Bees
Apidologie, 2004Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:Observations were conducted in Nepal, on A. laboriosa nests in the Himalayas, and A. dorsata in Rampur, Chitwan. At low temperatures, A. laboriosa Worker Bees of the whole nest curtain repeatedly raised the abdomen up and down with its tip at the peak up to 30-40°. Frequency of those movements was correlated with ambient temperature. With the increase in temperature, from 10 °C to 17 °C, the percentage of Workers performing the temperature correlated dorso-ventral abdomen flipping (AF) dropped significantly from 51.4% to 7.5%. The duration of particular AF decreased from 0.62 s at 10 °C to 0.27 s at 17 °C. The Workers repeated successive AF every 1.75 s at 10 °C and every 6.00 s at 17 °C. A. dorsata performed similar movements. However, the duration of single AF was shorter in A. dorsata than in A. laboriosa, and A. dorsata repeated those movements more frequently than A. laboriosa.
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Periodic mass flights of Apis laboriosa in Nepal
Apidologie, 2003Co-Authors: Jerzy Woyke, Jerzy Wilde, Maria WildeAbstract:The investigations were conducted in the Himalayas in Nepal. Two cliff sites, one with 16 A. laboriosa nests and the other with 53 nests were observed. Together 120 periodic mass flights (PMF) performed by A. laboriosa Worker Bees during 8 days were recorded. Workers from $50-81\%$ of colonies performed PMF, during days of adequate weather conditions. The flights were not performed during overcast days. Worker Bees from different colonies perform PMF at different times of the day. Workers from the same colonies perform PMF at different times in subsequent days. While Workers from some colonies did not perform any PMF during several days, others perform 2 or 3 PMF per day.
Hemagirigowda Ravikumar - One of the best experts on this subject based on the ideXlab platform.
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Comparative morphometric studies of the sting apparatus of the Worker Bees of four different Apis species (Apis dorsata, Apis mellifera, Apis cerana and Apis florea)
Journal of Apicultural Research, 2013Co-Authors: Nallahalli Shivarajegowda Surendra, Gopasandra Narayanappa Jayaram, Muniswamy Reddy Shankara Reddy, Hemagirigowda RavikumarAbstract:SummaryTwo glands associated with the sting apparatus of Worker honey Bees produce venom. The aim of this study was to analyse the size and morphometrics of the sting apparatus of Worker Bees of fo...
Francis L W Ratnieks - One of the best experts on this subject based on the ideXlab platform.
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towards integrated control of varroa 2 comparing application methods and doses of oxalic acid on the mortality of phoretic varroa destructor mites and their honey bee hosts
Journal of Apicultural Research, 2015Co-Authors: Hasan Al Toufailia, Luciano Scandian, Francis L W RatnieksAbstract:In the past two decades, the parasitic mite Varroa destructor has become harder to control with synthetic acaricide chemicals due to genetic resistance. We determined the efficacy of the natural chemical oxalic acid (OA) in killing phoretic mites on adult Worker Bees under field conditions in southern England. We compared three OA application methods (trickling, spraying, and sublimation) at three or four (sublimation) doses, using 110 broodless colonies in early January 2013. Treatment efficacy was assessed by extracting mites from samples of c. 270 Worker Bees collected immediately before and 10 days after treatment. All three methods could give high varroa mortality, c. 93–95%, using 2.25 g OA per colony. However, sublimation was superior as it gave higher mortality at lower doses (.56 or 1.125 g per colony: trickling 20, 57% mortality; spraying 25, 86%; sublimation 81, 97%.). Sublimation using 2.25 g of OA also resulted in 3 and 12 times less Worker bee mortality in the 10 days after application than ...
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towards integrated control of varroa effect of variation in hygienic behaviour among honey bee colonies on mite population increase and deformed wing virus incidence
Journal of Apicultural Research, 2014Co-Authors: Hasan Al Toufailia, Luciano Scandian, Esmaeil Amiri, Per Kryger, Francis L W RatnieksAbstract:Hygienic behaviour in the honey bee, Apis mellifera, is the uncapping and removal of dead, diseased or infected brood from sealed cells by Worker Bees. We determined the effect of hygienic behaviour on varroa population growth and incidence of deformed wing virus (DWV), which can be transmitted by varroa. We treated 42 broodless honey bee colonies with oxalic acid in early January 2013 to reduce varroa populations to low levels, which we quantified by extracting mites from a sample of Worker Bees. We quantified varroa levels, again when the colonies were broodless, 48 weeks later. During the summer the hygienic behaviour in each colony was quantified four times using the Freeze Killed Brood (FKB) removal assay, and ranged from 27.5 % to 100 %. Varroa population increased greatly over the season, and there was a significant negative correlation between varroa increase and FKB removal. This was entirely due to fully hygienic colonies with >95 % FKB having only 43 % of the varroa build up of the less hygienic colonies.None of the 14 colonies with >80 % FKB removal had overt symptoms of DWV, whilst 36 % of the less hygienic colonies did. Higher levels of FKB removal also correlated significantly with lower numbers of DWV RNA copies in Worker Bees, but not in varroa mites. On average, fully hygienic colonies had c. 10,000 times less viral RNA than less hygienic colonies.
