Day-degree requirement (>9.4°C) for initial oviposition (IO0.5) in Tetranychus urticae as a function of accumulated cold rest (hours with temperatures < 4.0°C) for all (y = 63.9 − 0.0198 x, P < 0.01, r2 = 0.65); coastal (triangles, y = 56.9 − 0.0160 x, P > 0.05, r2 = 0.40); and inland (circles, y = 78.3 − 0.0279 x, P = 0.01, r2 = 0.83) sites
Individual estimates of the thermal requirement for each
calibration population were negatively correlated with cold rest
duration ( P < 0.01, Fig. 6 ).
However, when cold rest duration was tracked in the model and the
thermal requirement adjusted, unbiased model predictions for the
calibration populations (Fig. 5 b) were obtained only when
separate cold rest regressions for coastal and inland sites
(Fig. 6 ) were used to adjust the thermal requirement.
Predictions were based on a start day of 27 November and a
a mean thermal requirement of 34.9 dd (>9.4°C); or
b a thermal requirement that varied with accumulated cold
rest (Fig. 6 ).
However, the observation is consistent with the need to use
separate regressions for the two sites with respect to the
relationship between the thermal requirement and cold rest
(Fig. 6 ), and may reflect biological differences related to
the milder climate at coastal sites..
Viewing this image requires a subscription. If you are a subscriber, please log in.
This image is from the article titled "Initiation of oviposition after winter diapause in the spider mite Tetranychus urticae (Acari: Tetranychidae): prediction and historical patterns"
(from Population Ecology), which is copyrighted by The Society of Population Ecology and Springer. For more information on the
copyright for this image, please refer to the full image caption and to the
The image is being made available for non-commercial purposes for subscribers to SpringerImages. For more information on what you are allowed to do with this image, please see our copyright policy.
To request permissions to use any copyrighted material, please visit the source document.
Report a copyright concern regarding this image.
Log in or register to save your favorite images and download them as high-quality PowerPoint or PDF files.
Log in or register to save your search criteria.
© Springer, part of Springer Science+Business Media.
Remote Address: 126.96.36.199 Server: 21