404 



R. J. Barsdate et al. 



TABLE 9-8 Two-year Mean Densities and Taxonomic 

 Composition of Benthic Macroinverte- 

 brates from Hand-core Samples in Barrow 

 Thaw Ponds* 



*Standard errors are based on variation between mean densities for 



each sampling date. 

 Source: Mozley, 1978. 



5 - 



76 77 

 center 



76 77 

 Carex 



PONDE 



Trichotanypus 



Orthoclodiinae 



Tanypodinae 



Chironomini 



Tanytarsini 



Tr 



75 76 77 

 center 



75 76 77 

 Carex 



POND n 



FIGURE 9-10. Number of 

 emerging chironomid 

 adults per square meter by 

 subfamily in the two 

 ponds treated with oil. 

 Trapping was continuous 

 through the emergence 

 season. (After Mozley and 

 Butler 1978.) 



