1. Reduction in locomotor ability as a cost of reproduction in gravid snakes

   • R. A. Seigel
   • M. M. Huggins
   • N. B. Ford

   Original Papers Pages: 481 - 485

2. Hydraulic lift: Substantial nocturnal water transport between soil layers by Artemisia tridentata roots

   • J. H. Richards
   • M. M. Caldwell

   Original Papers Pages: 486 - 489

3. Microhabitat use in a mediterranean riverine fish assemblage

   • G. D. Grossman
   • A. de Sostoa
   • J. Lobon-Cerviá

   Original Papers Pages: 490 - 500

4. Microhabitat use in a mediterranean riverine fish assemblage

   • G. D. Grossman
   • A. de Sostoa
   • J. Lobon-Cerviá

   Original Papers Pages: 501 - 512

5. Effect of nitrogen fertilization upon the secondary chemistry and nutritional value of quaking aspen (Populus tremuloides Michx.) leaves for the large aspen tortrix (Choristoneura conflictana (Walker))

   • J. P. Bryant
   • T. P. Clausen
   • R. A. Werner

   Original Papers Pages: 513 - 517

6. Trapping efficiency of three carnivorous Pinguicula species

   • P. S. Karlsson
   • K. O. Nordell
   • A. Svensson

   Original Papers Pages: 518 - 521

7. Pseudocopulation of an orchid by male ants: a test of two hypotheses accounting for the rarity of ant pollination

   • R. Peakall
   • A. J. Beattie
   • S. H. James

   Original Papers Pages: 522 - 524

8. Photographic estimation of photosynthetically active radiation: evaluation of a computerized technique

   • R. L. Chazdon
   • C. B. Field

   Original Papers Pages: 525 - 532

9. Numerical responses by populations of red fox and mountain hare during an outbreak of sarcoptic mange

   • K. Danell
   • B. Hörnfeldt

   Original Papers Pages: 533 - 536

10. The population dynamics of Cheilosia fasciata (Diptera, Syrphidae): significance of environmental factors and behavioural adaptations in a phytophagous insect

    • K. Hövemeyer

    Original Papers Pages: 537 - 542

11. Pattern and mortality in Colorado Desert plants

    • S. J. Wright
    • H. F. Howe

    Original Papers Pages: 543 - 552

12. Natural and Chernobyl-caused radioactivity in mushrooms, mosses and soil-samples of defined biotops in SW Bavaria

    • E. F. Elstner
    • Rita Fink
    • H. Ziegler

    Original Papers Pages: 553 - 558

13. Seasonal wing length dimorphism in a tropical seed bug: ecological significance of the short-winged form

    • S. Tanaka
    • H. Wolda

    Original Papers Pages: 559 - 565

14. Altitudinal changes in the incidence of crassulacean acid metabolism in vascular epiphytes and related life forms in Papua New Guinea

    • M. J. Earnshaw
    • K. Winter
    • T. C. Gunn

    Original Papers Pages: 566 - 572

15. Soil and plant water relations in a crested wheatgrass pasture: response to spring grazing by cattle

    • J. M. Wraith
    • D. A. Johnson
    • D. V. Sisson

    Original Papers Pages: 573 - 578

16. Methods for detecting non-randomness in species co-occurrences: a contribution

    • J. B. Wilson

    Original Papers Pages: 579 - 582

17. Effect of larval host on life history traits of the mediterranean fruit fly, Ceratitis capitata

    • D. A. Krainacker
    • J. R. Carey
    • R. I. Vargas

    Original Papers Pages: 583 - 590

18. Comparative responses of Achillea millefolium ecotypes to competition and soil type

    • S. S. Higgins
    • R. N. Mack

    Original Papers Pages: 591 - 597

19. Changes in the down colour of chicks during a population decline in red grouse

    • R. Moss
    • A. Watson

    Original Papers Pages: 598 - 600

20. Oviposition site selection in Cactoblastis cactorum (Lepidoptera): constraints and compromises

    • H. G. Robertson

    Original Papers Pages: 601 - 608

21. Spatial heterogeneity, population “regulation” and local extinction in simulated host-parasitoid interactions

    • G. Morrison
    • P. Barbosa

    Original Papers Pages: 609 - 614

22. Induced tolerance of neonate Heliothis zea to host plant allelochemicals and carbaryl following incubation of eggs on foliage of Lycopersicon hirsutum f. glabratum

    • G. G. Kennedy
    • R. R. Farrar
    • M. R. Riskallah

    Original Papers Pages: 615 - 620

23. Interspecific competition between the principal larval parasitoids of the pine sawfly, Neodiprion sertifer (Geoff.) (Hym.: Diprionidae)

    • H. Pschorn-Walcher

    Original Papers Pages: 621 - 625

24. Paternal effects on offspring traits in Scaphiopus couchi (Anura: Pelobatidae)

    • B. D. Woodward

    Original Papers Pages: 626 - 629

25. Evolution of erect growth forms in domesticated wheats: possible effects of grazing

    • Y. Waisel

    Short Communication Pages: 630 - 632