Dumbbell index

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In addition to the cubital index and the discordial shift , the dumbbell index serves to segregate honey bees . These characteristics, which are characteristic of every breed of bee, can be determined from the vein pattern of the wings. The dumbbell index, like the cubital index, is measured on the 3rd cubital cell (c3). The ratio of the two lengths C and D finally gives the dumbbell index.

The dumbbell index results from C / D.

The pure-bred, unmixed dark European honeybee Apis mellifera mellifera can, for example, have a dumbbell index of up to 0.923, the cubital index being a maximum of 1.9 and the discordial shift must be negative. Any values ​​that deviate from this indicate that it is not a purebred dark bee, but a hybrid type.

In general, the dumbbell index and the discordial shift in pure-bred bees are arranged along a regression line. This makes it possible to separate the Mellifera breed from the Carnica breed and the Caucasica breed from the Ligustica breed better than with the Cubital index alone. The values ​​of dumbbell index and discordial displacement are higher in Carnica and Ligustica than in Mellifera . The breeds Carnica and Ligustica cannot only be distinguished by the dumbbell index and the discordial shift. The same goes for the Mellifera and Caucasica races . The dumbbell index can also be used as control values ​​together with the discordial shift to check the pure mating in pure bred colonies. The additional assessment of body characteristics such as armor marks, hair length and felt bandage width cannot be replaced by calculating the dumbbell index and discordial shift.

The programs FLÜGEL-INDEX from Günther Pexa and CBeeWing from Cybis Elektronik & Data AB can be used to calculate the dumbbell, cubital index and discordial displacement for the examination of honeybees ' characteristics.

Individual evidence

  1. Beekeeping Lexicon - Michael Schäfer Dumbbell Index , website of the Beekeeping Association Dietmannsried u. Environment eV October 8, 2016, accessed May 8, 2017.
  2. ^ New biometric method used in Sweden Per Thunman, Cybis Elektronik & Data AB. 2004, Retrieved May 8, 2017.
  3. a b c Wing index - measurement method. Günther Pexa, software for beekeeping. 2006, Retrieved May 8, 2017.
  4. wing investigations in the Dark Bee Kai-Michael Engfer, Northern Bee - The Phantom bee. May 8, 2012, Retrieved May 8, 2017.
  5. The Nordic bee Apis Mellifera Mellifera - a natural heritage Bernd Klotz, website of the Lapland beekeeping Kvarnhults Bigård. Accessed May 8, 2017.
  6. Dumbbell Index and Discordial Shift Roland Wörsching, website of the Apis mellifera mellifera. March 7, 2015, Retrieved May 8, 2017.
  7. ^ Wing index Günther Pexa, software for beekeeping. 2006, Retrieved May 8, 2017.
  8. Using the CooRecorder and CBeeWing programs to select bees for breeding Lars-Åke Larsson, Cybis Elektronik & Data AB. January 21, 2005, accessed May 8, 2017.