1. The reproductive strategy of the gregarious parasitoid, Pteromalus puparum (Hymenoptera: Pteromalidae)

   • Masami Takagi

   Original Papers Pages: 321 - 325

2. Ecological energetics of Chaoborus in a tropical lake

   • Claudia Cressa
   • William M. Lewis Jr.

   Original Papers Pages: 326 - 331

3. Pollination by deceit, floral sex ratios and seed set in dioecious Rubus chamaemorus L.

   • J. Ågren
   • T. Elmqvist
   • A. Tunlid

   Original Papers Pages: 332 - 338

4. Soil acidification and vegetation changes in deciduous forest in southern Sweden

   • Ursula Falkengren-Grerup

   Original Papers Pages: 339 - 347

5. Canopy dynamics estimated from shoot morphology in an evergreen broad-leaved forest

   • F. Koike

   Original Papers Pages: 348 - 350

6. Mating pattern variability among western toad (Bufo boreas) populations

   • Deanna H. Olson
   • Andrew R. Blaustein
   • Richard K. O'Hara

   Original Papers Pages: 351 - 356

7. Consumption of nematodes by fungivorous mites, Tyrophagus spp. (Acarina: Astigmata: Acaridae)

   • D. E. Walter
   • R. A. Hudgens
   • D. W. Freckman

   Original Papers Pages: 357 - 361

8. The acute toxicity of cadmium to different larval stages of Chironomus riparius (Diptera: Chironomidae) and its ecological significance for pollution regulation

   • Kendall A. Williams
   • David W. J. Green
   • Deborah E. Gower

   Original Papers Pages: 362 - 366

9. Feeding patterns in eastern tropical Pacific blennioid fishes (Teleostei: Tripterygiidae, Labrisomidae, Chaenopsidae, Blenniidae)

   • Kurt Kotrschal
   • Don A. Thomson

   Original Papers Pages: 367 - 378

10. Azteca protection of Cecropia: ant occupation benefits juvenile trees

    • Eugene W. Schupp

    Original Papers Pages: 379 - 385

11. Yeast communities from host plants and associated Drosophila in southern arizona: new isolations and analysis of the relative importance of hosts and vectors on comunity composition

    • Philip F. Ganter
    • William T. Starmer
    • Herman J. Phaff

    Original Papers Pages: 386 - 392

12. Use of an analytical model to study limitations on net photosynthesis in Arbutus unedo under field conditions

    • P. C. Harley
    • J. D. Tenhunen
    • O. L. Lange

    Original Papers Pages: 393 - 401

13. Stochastic aggregative responses and spatial patterns of parasitism in patchy host-parasitoid interactions

    • Gerold Morrison

    Original Papers Pages: 402 - 410

14. Variation in Cnidoscolus texanus in relation to herbivory

    • A. Joseph Pollard

    Original Papers Pages: 411 - 413

15. Behavioural adaptations of ground living bushcrickets to the properties of sound propagation in low grassland

    • Armin Keuper
    • Klaus Kalmring
    • Werner Kaiser

    Original Papers Pages: 414 - 422

16. Episodic stemflow inputs of magnesium and potassium to a tropical forest floor during heavy rainfall events

    • Stanley R. Herwitz

    Original Papers Pages: 423 - 425

17. Variable HCO ₃ ^- affinity of Elodea canadensis Michaux in response to different HCO ₃ ^- and CO₂ concentrations during growth

    • Kaj Sand-Jensen
    • David M. Gordon

    Original Papers Pages: 426 - 432

18. The influence of environmental variables on the density of larval lampreys in different seasons

    • I. C. Potter
    • R. W. Hilliard
    • R. J. McKay

    Original Papers Pages: 433 - 440

19. Water stress and light intensity effects on growth and nocturnal acid accumulation in a terrestrial CAM bromeliad (Bromelia humilis Jacq.) under natural conditions

    • E. Medina
    • E. Olivares
    • M. Diaz

    Original Papers Pages: 441 - 446

20. Acid stress in Rumex hydrolapathum (Polygonaceae) and its influence on the phytophage Lycaena dispar (Lepidoptera; Lycaenidae)

    • F. A. Bink

    Original Papers Pages: 447 - 451

21. The effects of chrysomelid beetle grazing and plant competition on the growth of Rumex obtusifolius

    • D. A. Cottam
    • J. B. Whittaker
    • A. J. C. Malloch

    Original Papers Pages: 452 - 456

22. Guild structure in water mites (Unionicola spp.) inhabiting freshwater mussels: choice, competitive exclusion and sex

    • Barbara J. Downes

    Original Papers Pages: 457 - 465

23. Carbon and nitrogen partitioning in the biennial monocarp Arctium tomentosum Mill

    • H. Heilmeier
    • E. -D. Schulze
    • D. M. Whale

    Original Papers Pages: 466 - 474

24. Water use by the desert cucurbit Citrullus colocynthis (L.) Schrad.

    • Ali Mubarak Althawadi
    • John Grace

    Original Papers Pages: 475 - 480