I have also analysed my results from my simple experiment to compare trapping results using 2 different bulbs. A summary is included here. I have got a more detailed analysis with graphs. looking at time of year and species caught but I am not sure whether it is appropriate to share it here?
Throughout 2016 I
attempted to find pairs of nights that were not more than a few days apart and
with forecast weather conditions in terms of temperature, wind speed and
rainfall as similar as possible. On one
of the two nights I would run my Robinson trap with a standard 125W MV bulb and
on the other night I ran the same trap in the same place but with a 20W
Blacklight bulb.
In total 35 pairs of results were obtained.
A summary of the results is given below.
125W MV
|
20W Eco
|
Percentage
| |
Total number of moths caught
|
3078
|
1832
|
60
|
Mean number of moths per night
|
88
|
52
| |
Mean number of species per night
|
25
|
17
|
68
|
Total number of different species
caught
|
259
|
213
|
82
|
Number of species not caught with
other bulb
|
83
|
39
|
Andy Newbold, Sibford Ferris, Oxon
Hi Andy, there's no problem at all adding your comparison results here, however detailed they might be! It is in the interests of all of us that we learn more about other bulb types now that the days of 125wt MV seem to be numbered.
ReplyDeleteYou will have noticed, though, that Blogger can be a little bit fussy about displaying charts, graphs, etc so it may take a bit of trial and error to get things to appear as you would want them (try using the 'preview' feature before uploading). It has no real problem with pictures so if you can somehow save any charts, graphs, etc as jpegs that might prove easier.
I think these results are very interesting. Is the 'blacklight' one that just gives off uv or is it one of those which the makers call blacklight, but it glows more like an actinic?
ReplyDeleteIf you can get the breakdown onto the site, then that would be interesting, too. There is, of course, a long-running debate about whether different lights attract different moths, not just different numbers.
I will attempt to get a fuller breakdown of the results onto the site. The bulb used was the 'Eco' bulb supplied by Watkins and Doncaster which gives off a visible purple light as well as presumably a lot of UV. My initial impression is that in my results there is little evidence of different moths being attracted to the different bulbs but it is a rather small set of data. I will give more details when I report the results more fully.
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