This may be explained by weak founder effects when the species was introduced, on-going gene flow, and/or insufficient time for genetic drift to differentiate the populations since their establishment.
On the other hand, if the populations were recently separated, there would insufficient time for genetic drift to have occurred in each small fragmented population, and most populations would share common haplotypes [ 87].
On June 13 , 2006 drifting buoy 26028 ended its long-term data collection of sea surface temperature after transmitting for 10 years, 4 months, and 16 days, which is the longest known data collection time for any drifting buoy.
This model is of maximum spherical harmonic degree and order 260 and contains time series for drifts as well as annual and semiannual variations of the spherical harmonic coefficients for degree 2 50.
And 250 million years would be plenty of time for Antarctica to drift from balmy tropical waters down to the frigid bottom of the Earth.
The precision of the method was evaluated in terms of repeatability and reproducibility obtaining values lower than 1.1% for drift time and 12.0% for peak height when the membrane was used coupled to the UV-IMS for all target analytes in the humidity range of 10 75% RH.
A longer drift tube can also improve the resolution [15], but due to the long drift time (the time for ions to pass through the drift tube) through the drift tube, the ions will suffer severe losses and the signal intensity will be low.
For typical pass-through paleomagnetic measurements, background magnetic moment is monitored at the beginning and the end of each measurement run and linearly interpolated through measurement time to correct for drifts.
Sensor data was corrected for drift over time, per period, by transformation into standardized residuals by linear regression.
Values were corrected for drift over time by standardization to calibrator lot 51 and reagent lot 40.
