Subject Index 505 



Gastropoda, 299 

 Gastrotrichs, 378 

 Geology of Barrow area, 26 

 Grazing 



affects algae and bacteria, 

 218-219, 382 



affects bacterial activity, 356 



affects benthic algae, 219 



affects P turnover, 134 



chironomid, 352 



enhances algae activity, 207, 

 218 



food chain, 8 



in model, 445 



microbenthos, 352, 379 



protozoa, 354 



zooplankton, 188, 217, 353 

 Grazing rates, protozoans and 

 micrometazoans, 9 



Half-saturation, light, 205, 206 

 Harpacticoid copepods, 374, 



378, 381 

 Hatching, synchrony in 



Daphnia, 272 

 Heat balance, seasonal, 33 

 Hemiptera, 14, 299 

 Heterocope, 4, 251, 256, 263, 

 403 



infant killer, 288 



predator of Daphnia, 285 

 Herbivores, 4 

 Hirudinea, 299 

 Histophagous ciliates, 377 

 History, pond site, 51 

 Humic compounds 



composition, 155 



concentration, 157 



light extinction changes, 70 



percent of DOC, 158 



water budget effects, 158 

 Hydrology, description, 33 

 Hydrolysis, 360 



Ice 



effect on plants, 243 



formation time, 22, 95 



melt time, 33, 34 

 Ice cover, lakes and ponds, 22 

 Ice wedges, 28, 52 

 Ikroavik Lake, 20, 24, 25 



ammonification and 

 nitrification, 110 



benthic algal productivity, 

 199 



DRP, 119 



interstitial water, 85 



light extinction, 71 



N concentrations, 100, 102 



nutrient uptake, 108 



oxygen, 98 



phytoplankton productivity, 

 199 



PP, 120 



temperature, 57 



zooplankton, 251 

 Imikpuk Lake, 24, 25 



temperature in sediments, 58 



thaw dates, 61 

 Infant killer, Heterocope, 288 

 Ingestion, in model, 429, 432 

 Insects. See Chapter 7 



oil pond, 403 



soils, 42 

 International Biological 



Program, description, 19 

 Interstitial water 



ammonia, 108 



inorganic carbon, 96 



inorganic ions, 85 



N concentration, 104 



P concentration, 121 

 Invertebrates, factors affecting 



in soil, 41, 42 

 Iron 



dissolved in water, 82 



extractable, 141 



in Carex, 362 



