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FIG.
A1. Cubic polynomial trend surface used in simulations to genreate the values
of X2, an unmeasured nonhabitat variable
that was not estimable in simulations. Surface plotted is for the expected value
of X2 = 2000 + 4.5LONG + 7.5LAT + 0.1LONG2 – 0.2LAT2 + 0.00LONG3 +  ;
with uniformly distributed (-900,
900), LAT and LONG were uniformly distributed latitude and longitude
coordinates ( = 0, range = -50
to 50). |