RESPONSE OF A MOBILE INVERTEBRATE 



517 



A M 

 1976 



DATE 



Fig. 3 Seasonal abundance (medians and ranges) of H. azteca 



collected from Lake Columbia ( ), at station 9, and from the 



settling basin ( ), at station 10. Ranges are shown as vertical 



bars. 



TABLE 3 



TEMPERATURE AND DENSITY EFFECTS ON 



COLONIZATION OF SAMPLERS BY H. azteca IN 12-hr 



LABORATORY EXPERIMENTS 



*Percentage differences between the two temperatures were 

 not significant. 



