Megachile_Materials and methods

The bees have been filmed in Sint-Michielsgestel, the Netherlands, in the summer of 2009 from June 21 until July 2. The number of individual male bees is small, it even cannot be excluded that only one male has been filmed. The camera is a Casio EX-F1. The camera has been used to film in HD with 30 frames per second and in a high speed mode with 300 frames per second. The camera is held by hand. Parts of the film with much movement along the line of sight have been discarded. The films have been analysed in small parts of a few seconds, called tracks, using the “Tracker Video analysis and modelling tool” , “Tracker” for short (http://www.cabrillo.edu/%7Edbrown/tracker/index.html). The tracks are coded by the date and time of  recording the film and a code for a specific track of the film. Track 090629_1548A.trk is track A from the film recorded June 29 2009 at time 15.48. The unit of distance is chosen to be the length of the male, approximately 1.7 cm. The analysis is using relative distances, transformation from units to cm is therefore not necessary in estimating delay and gain.

The position of one clearly recognizable point of the male has been measured, i.e. the centre of the face. For the female the scutellum has been chosen.

Calculations have been performed with Matlab.  

 

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