Abstract

Recorded occurrences of mass movements of Armadillidium rulgare Latreille on exposed surfaces are correlated with a repeated synoptic weather pattern in north-central Texas. Terrestrial isopods were active at Forth Worth, Texas, during the spring and fall seasons of 1960, 1961, 1962> and 19637 when maritime Tropical (mT) air was introduced over populations. Periods of activity were characterized 1by high temperature, high humidity, and low level cloud conditions. Typical circulation patterns producing these conditions result from high pressure areas centered east of the study area and moist Gulf air flow into low pressure and frontal systems to the north. Correlation of mass movements of isopods with these wvather patterns emphasizes physiological and behavioral responses to the general atmospheric circulation which determines the specific changes in tempvrature, relative humidity, and wind usually recorded in ecological studies.

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