Index 



565 



Ice wedge formation, 15 

 Infiltration, 55 

 Insolation 



see Radiation 

 Invertebrates, 10 



abundance, 412-424 



biomass, 412-424, 437 



decomposition, 482 



diets, 437-439 



distribution, 418, 456 



energetics, 432-436 



feeding habits, 421 



habitats, 418 



life cycles, 429, 456 



nutrient content, 465 



respiration, 439-440 



role in nutrient cycles, 441-443 



soil, 441 



spatial variation, 413 



species diversity, 412 



standing crop, 464 



see also Acari, Coilembola, 

 Enchytraeidae, 

 Nematoda, Rotifers, 

 Tardigrades, Tipulidae 

 Irradiance 



photosynthesis, 127 



see also Radiation 



Jaegers 

 density, 363-364 

 food consumption, 369 

 nutrient transport, 408 

 predators, 360-364 

 prey selection, 366-367 



Landforms, 16-21 

 Lapland longspurs 



see Birds 

 Leaf 



absorptance, 82-88 



area index, 108 



growth, 153, 200-201, 217 



photosynthesis, 106-108 



resistance, 106, 129 

 temperature, 85-86 

 Lemmings 



abiotic influences on popula- 

 tion, 371-374 

 activity patterns, 345-346 

 body size, 399 

 breeding, 340-341 

 brown at Barrow, 337-384 

 burrows, 43, 346, 350-351, 



356, 404 

 collared at Barrow, 337-338, 



347 

 comparison with caribou, 



399-409 

 cycles, 338-340, 384, 409 

 demography, 340-343 

 density, 338-340, 363, 374, 



401 

 density of predators, 363-366 

 diet, 347-348 

 digestibihty of forage, 353, 



358 

 effect on soil, 252 

 energy requirements, 348-358, 



381 

 feces and urine in soil, 263, 



377 

 forage, 375-377, 381 

 grazing, 177, 179, 212, 346, 



354-356,402-405,408-409 



482 

 growth rate, 349, 350, 399 

 habitat use, 343-347, 371, 405 

 intrinsic influences on popula- 

 tion, 382 

 life cycle, 400 

 metabolism, 349, 351 

 mortality, 370-371, 373 

 nutrient content, 465 

 nutrient-recovery hypothesis, 



375-380 

 nutrient-transport hypothesis, 



406-408 



