The successive presentation of the unrewarded CS causes a decrease in the CR level from the first to the last testing event and it is considered as a measure of extinction [18].
The number of trials on which a bird pecked during the final 10 trials of this session was recorded as a measure of extinction learning.
Since the LOI measures ease of extinction, which essentially depends on the same physical phenomena as ignition, the results suggest that there has been a simultaneous improvement in both the dripping and ignition resistance.
The constant rate birth-death model yields accurate posterior estimates of the speciation rate λ (Table 2) and efficient measures of the extinction rate are obtained when the extinction fraction is high (a = 0.9).
Unless we know what species exist and where, how are we to recognize invasive species, measure rates of extinction or even know whether our conservation strategies are working or not?
The study corroborated findings of research from 2007 which suggested that the ratios of red to green in the paintings correlated well with the aerosol optical depth a measure of the extinction of sunlight by dust at the time in which they were made.
This provides a measure of stochastic extinction risk in a range of persistent populations.
Therefore, Red List categorization of chondrichthyans should be interpreted as a comparative measure of relative extinction risk, in recognition that unmanaged steep declines, even of large populations, may ultimately lead to ecosystem perturbations and eventually biological extinction.
Both MISR (primarily version 15, at 558 nm) and MODIS (collection 5, at 550 nm) provide retrievals of AOD, a dimensionless measure of light extinction over the entire vertical column of air through the atmosphere (also known as aerosol optical thickness).
Since the mid 2000s, the MODIS (Moderate Resolution Imaging Spectroradiometer) and MISR (Multiangle Imaging Spectroradiometer) instruments onboard the National Aeronautics and Space Administration's (NASA) Terra satellite has provided global observations of aerosol optical depth (AOD), a measure of light extinction by aerosol in the atmospheric column above the earth's surface.
