1. Capture and allocation of nitrogen byQuercus douglasii seedlings in competition with annual and perennial grasses

   • J. M. Welker
   • D. R. Gordon
   • K. J. Rice

   Original Papers Pages: 459 - 466

2. Resource base, parity, and reproductive condition affect females' feeding time and nutrient intake within and between groups of a baboon population

   • Philip Muruthi
   • Jeanne Altmann
   • Stuart Altmann

   Original Papers Pages: 467 - 472

3. Life and death beneath macrophyte canopies: effects of understory kelps on growth rates and survival of marine, benthic suspension feeders

   • J. E. Eckman
   • D. O. Duggins

   Original Papers Pages: 473 - 487

4. Nitrate nutrition ofDeschampsia flexuosa (L.) Trin. in relation to nitrogen deposition in Sweden

   • L. Högbom
   • P. Högberg

   Original Papers Pages: 488 - 494

5. Nitrate assimilation in coexisting vascular plants in mire and swamp forest habitats in Central Sweden

   • L. Högbom
   • M. Ohlson

   Original Papers Pages: 495 - 499

6. Metabolic rate and cost of growth in juvenile pike (Esox lucius L.) and perch (Perca fluviatilis L.): the use of energy budgets as indicators of environmental change

   • W. Wieser
   • N. Medgyesy

   Original Papers Pages: 500 - 505

7. Life-history variation in a hybrid species complex ofDaphnia

   • L. J. Weider
   • H. G. Wolf

   Original Papers Pages: 506 - 513

8. Are ant-aphid associations a tritrophic interaction? Oleander aphids and Argentine ants

   • C. M. Bristow

   Original Papers Pages: 514 - 521

9. Body size selection inAcanthoscelides alboscutellatus (Coleoptera: Bruchidae)

   • James R. Ott
   • Margarita Lampo

   Original Papers Pages: 522 - 527

10. Stable isotopic determinations of trophic relationships of great auks

    • Keith A. Hobson
    • William A. Montevecchi

    Original Papers Pages: 528 - 531

11. A trade-off between scale and precision in resource foraging

    • B. D. Campbell
    • J. P. Grime
    • J. M. L. Mackey

    Original Papers Pages: 532 - 538

12. Population distributions of plant size and light environment of giant ragweed (Ambrosia trifida L.) at three densities

    • Thomas W. Jurik

    Original Papers Pages: 539 - 550

13. The relation between above- and belowground biomass allocation patterns and competitive ability

    • R. Aerts
    • R. G. A. Boot
    • P. J. M. van der Aart

    Original Papers Pages: 551 - 559

14. Ecology of heterotrophic dinitrogen fixation in the rhizosphere of mangrove plant community at the Ganges river estuary in India

    • Anjan Sengupta
    • Subhendu Chaudhuri

    Original Papers Pages: 560 - 564

15. Photosynthetic pathways and ecological distribution ofEuphorbia species in Egypt

    • K. H. Batanouny
    • W. Stichler
    • H. Ziegler

    Original Papers Pages: 565 - 569

16. Pre-dispersal seed predation in Central American Acacia farnesiana: factors affecting the abundance of co-occurring bruchid beetles

    • Anna Traveset

    Original Papers 01 September 1991 Pages: 570 - 576

17. Spatial and temporal variability in a butterfly population

    • C. D. Thomas

    Original Papers Pages: 577 - 580

18. The macrobenthos fraction accessible to waders may represent marginal prey

    • Leo Zwarts
    • Jan H. Wanink

    Original Papers Pages: 581 - 587

19. Size, gender, and sex change in dwarf ginseng,Panax trifolium (Araliaceae)

    • Mark A. Schlessman

    Original Papers Pages: 588 - 595

20. Evidence for secondary seed dispersal by rodents in Panama

    • Pierre-Michel Forget
    • Tarek Milleron

    Short Communications Pages: 596 - 599

21. Size-biased dispersal prior to breeding in a damselfly: conflicting evidence from a natural population

    • David J. Thompson

    Short Communications Pages: 600 - 601

22. Fungal biomass associated with decaying leaf litter in a stream

    • M. O. Gessner
    • J. Schwoerbel

    Short Communications Pages: 602 - 603

23. Announcement

    Announcement Pages: 604 - 604