| Weather & Tabanidae - Russell, Ontario | |||
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This is a brief summary of what one might expect in
terms of biting fly catches relative to changes in weather during the summer
in Canada. I compared daily catches of tabanids in a unbaited Nzi trap during June and July 2001 (when numbers were high and fairly stable) with daily weather statistics calculated from hourly observations at the Ottawa Airport, 22 km WNW of Russell. Catches were best explained by daily maximum temperatures (r = 0.61, N = 60). Additional weather indices added no insights into daily variation in tabanid catches. All partial correlation coefficients were not significant after removing the effect of maximum temperature. |
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| Simple Correlation Coefficients, Probabilities | |||
| Weather Index | All Tabanidae | Tabanus & Hybomitra | Chrysops |
| Daily Maximum Temperature | 0.61, < 0.001 | 0.59, < 0.001 | 0.44, < 0.001 |
| Daily Minimum Temperature | 0.34, < 0.01 | 0.33, < 0.01 | 0.23, NS |
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Daylight Mean Temperature |
0.57, < 0.001 | 0.54, < 0.001 | 0.42, < 0.001 |
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Daylight Mean Saturation Deficit |
0.55, < 0.001 | 0.50, < 0.001 | 0.45, < 0.001 |
| Daylight Mean Relative Humidity | -0.37, < 0.005 | -0.31, < 0.05 | -0.34, < 0.01 |
| Daylight Mean Wind Speed | -0.27, < 0.05 | -0.22, NS | -0.26, < 0.05 |
| Daily Weather Statistics May - October 2001 | |||
| Daily Minimum | |||
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Daily Maximum |
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Daily Rainfall |
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| Mean Temperature (Sunrise-Sunset) | |||
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| Mean Wind Speed (Sunrise-Sunset) | |||
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| Mean Relative Humidity (Sunrise-Sunset) | |||
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