Table XVII. Soil arthropods, site 2 control plots. 



15 JUNt 25 JUNfc 5 JULY 15 JULY 25 JULY <. AUG. 1 <. 4U&. 2* AUG. 



?ai 79 



• • VALUC 'JOT AVAlLiPLE 



Table XVIIl. Soil arthropods, site 1. 



19 JUNE 29 JUNE 9 JULY 19 JULY 29 JULY 8 AUG. 18 AUG. 28 AUG. 



6500 



21 



•• VALUE NOT AVAILABLE 



attest to the significance of CoUemboIa in the tundra ecosystem. Arctic CoUembola weigh 

 approximately 1.25 x 10'' g (dry weight) each. The biomass of CoUembola thus exceeded 0.5 g/m'. 

 This value is similar to that observed for the two Tipulidae species which are much less abundant but 

 many times larger than the Ctollembola. Biomass turnover, however, is probably much more rapid in 

 the CoUembola than in the Tipulidae, so that the CoUembola are of greater significance in the move- 

 ment of energy in the ecosystem. Biomass estimates are not available for the soil mites. The 

 numbers of these arthropods are also quite high, and the mites may rival the CoUembola in energetic 

 importance. 



The next most abundant arthropods recorded were larvae of the various species of Diptera, 

 suborder Nematocera. These weigh approximately 2 x 10"* g each, and the densities recorded 

 represent about 0.1 g dry weight/m\ 



45 



