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Files in this Data Supplement:
Fig. S1. Trial in which specimen (mass 189.0 mg) appeared to be using rhythmic tracheal compressions, but stopped when the x-ray beam was turned on. The beetle resumed compressions when the beam was turned off (not shown).
Movie 1. Rhythmic tracheal compression in the anterior head of the carabid beetle Pterostichus stygicus. Note occurrence of tracheal collapse in the mandibles as well. Anterior is to the left; field of view is 3.2 mm×2.4 mm. Frame rate, 15 frames s−1.
Movie 2. Rhythmic tracheal compression in the prothorax of the carabid beetle Pterostichus stygicus. Anterior is to the left; field of view is 3.2 mm×2.4 mm. Frame rate, 15 frames s−1.
Movie 3. Rhythmic tracheal compression in the mesothorax of the carabid beetle Pterostichus stygicus. Circular structures are coxae. Anterior is to the left; field of view is 3.2 mm×2.4 mm. Frame rate, 15 frames s−1.
Movie 4. Rhythmic tracheal compression in the lateral mesothorax and metathorax of the carabid beetle Pterostichus stygicus. Anterior is to the left; field of view is 3.2mm×2.4 mm. Frame rate, 15 frames s−1.
Movie 5. Rhythmic tracheal compression in the abdomen of the carabid beetle Pterostichus stygicus. Anterior is to the left; field of view is 3.2 mm×2.4 mm. Frame rate, 15 frames s−1.
Movie 6. Correlation of tracheal compressions with pulses of external CO2 in the carabid beetle Pterostichus stygicus. Video is focused on the prothorax and femur of the beetle. Anterior is to the left; field of view is 3.2 mm×2.4 mm. Frame rate, 15 frames s−1.
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