A Portuguese Two Host Tick
Hyalomma m. marginatum

Dartmoor Tick Watch
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Dermacentor reticulatus

 

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"Now showing ....."

>>>   Tick - The Movie!   <<<


In Windows Media Player .....

Movie selection File size  Playing time Download time
on BT Broadband*
1. Engorged tick righting itself - a useful trick if upended! 0.9 MB  9 secs 20 secs
2. A tick walking in a Petri dish 0.6 MB  9 secs 10 secs
3. "Tangle of ticks" - 47 live ticks together in one place ** 1.0 MB 16 secs 13 secs
4. "Tangle of ticks - II" - 72 live ticks together in one place *** 0.6 MB 8 secs

15 secs

5. Seven pairs of mating sheep ticks - static arrangement 0.3 MB 8 secs

20 secs

6. Sheep tick nymph on finger, showing the rate of movement 1.4 MB 5 secs 9 secs
7. Nymph gut contents - I - x400 with zoom 26 May 2009 2.9 MB 11 secs 13 secs
8. Nymph gut contents - II - x1,000 with zoom 26 May 2009 2.9 MB 10 secs 6 secs
9. Nymph gut contents - III - x1,000 with zoom 27 May 2009 1.8 MB 7 secs 5 secs
10. Nymph gut contents - IV - x1,000 with zoom 13 Jun 2009 3.6 MB 15 secs 8 secs
11. Nymph gut contents - V - x1,000 with zoom 13 Jun 2009
Very small frenetically wriggling entities. The cells are salivary gland tissue?
Scales:
Inner ring diameter = 13 micrometres - this is a correction (22 Jun 2009); outer double ring thickness = 1 micrometre.
4.0 MB 14 secs 11 secs
12. Nymph gut contents - VI - x1,000 with zoom 13 Jun 2009
A long "wriggly" - a chain of rod-like bacteria?
3.8 MB 14 secs 10 secs

13. Nymph gut contents - VII - x1,000 with zoom 14 Jun 2009
Definite long, doubled up spiralling microbe - spirochaete?
The bacteria are in a depth of saline and come in and out of focus in the microscope. This was one of four seen - at first I ignored them as something odd - they were partly doubled-up which may be a result of the non-physiological nature of the saline - missing electrolytes and incorrect pH (acidity / alkalinity)?
Scale: the outer double ring is 21 micrometres in diameter: outer double ring thickness = 1 micrometre.
1.9 MB 15 secs 29 secs
14. Yarner Wood Horse Circle - Habitat
Starts looking S.E. along main track past the circle, with circle at left, panning left and ending looking along/around the circle. 19 Jul 2009
3.8 MB 22 secs 20 secs

15. Yarner Horse Circle Leaf Litter
Picks up where previous movie (n. 14) stops, looking along/around the circle and panning down to the ground to show oak leaf litter, sparse grass and short whortleberry. 19 Jul 2009

2 MB 18 secs 8 secs
16. Yarner Horse Circle Extended
Starts looking N.W. along main track past Horse Circle. Shows rucksack and mini-scythe (for cutting bracken in the circle, with permission) for scale re. the height that the undergrowth has now reached and the reason for abandoning this sampling sweep. 19 Jul 2009
3 MB 32 secs 10 secs
17. Ringmoor Cows - 1
Showing another hazard of blanket dragging on Dartmoor - cows!
20 Jul 2009
3 MB 11 secs 10 secs
18. Ringmoor Cows - 2
Similar to the previous movie but filmed on the move, backwards!
20 Jul 2009
2 MB 8 secs 7 secs
19. Ringmoor Down Habitat
Showing how desolate this area is. It is not necessarily very high, at typically 300 metres (1,000 feet), but it is very exposed and wind-swept - listen to the sound track, and this was a non-windy day!
21 Jul 2009
3.9 MB 44 secs 7 secs
20. Brisworthy Plantation Habitat
Showing the stubby nature of the bracken area beside the plantation compared to the high bracken in the shelter of Yarner Wood (movies 14-16 ). This habitat contiguous with Ringmoor Down (movie 19).
21 Jul 2009
1.9 MB 16 secs 6 secs

* Depends on internet use at the time
** A 'still' photograph of the 47 ticks, cleaned-up, can be seen here and on the Photos page.
*** A 'still' photograph of the 72 ticks, cleaned-up, can be seen here and on the Photos page.
These (47 & 72 ticks) are all hedgehog ticks, removed from two sheepdogs - that is correct!


Incidental photos taken while looking at 1st nymph under the Leitz Nomarski microscope

Low power Nomarski image of the decapitated nymph-showing manually extruded gut contents, at top-left. Magnification: x250 plus zoom on the camera. The tick body in this image is probably about 1.4 mm long. The on-screen image on a 800x600 display is 50 mm, therefore the magnification is about x35.



 

Still image of gut content entities under oil immersion (x1,000 + zoom). This can be seen more dramatically in the gut content movies above. The moving microbes are in the 1 to 5 micrometer size range.
(1 micrometer = 1/1,000 mm)
 



 

Nymph foot, showing the terminal claws - highly magnified.

 


 

 

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