0 relating to the position north or south of the equator measured from 0° to 90°: --
1 of or relating to the distance north or south of the equator measured from 0° to 90°: --
Under natural conditions there is a latitudinal gradient in the date of diapause onset.
These temperatures are conservative values because they were obtained by averaging the temperatures over latitudinal bands including large amounts of ocean.
Therefore, the present studies were concentrated in a band along the 40th parallel, north latitude in order to reduce latitudinal variation to a minimum.
A broader latitudinal range is likely to increase the probability of obtaining a significant latitudinal effect.
The latitudinal effect (an increase in number with latitude) was significant only in the first data set.
The centres were initially separated into regions using two latitudinal lines.
The relative importance of these factors in regulating germination in the wild appears to depend on the latitudinal origin of the population.
The latitudinal cline that was described here correlates both with colder winters and with warmer summers.
