1. Seasonal patterns of CO₂ and water vapor exchange of three salt marsh succulents

   • Ann E. Antlfinger
   • E. L. Dunn

   OriginalPaper Pages: 249 - 260

2. Optimal foraging: A case for random movement

   • Michael Zimmerman

   OriginalPaper Pages: 261 - 267

3. A comparative study of nitrogen fixation by the Anabaena-Azolla symbiosis and free-living populations of Anabaena spp. in Lake Ngahawa, New Zealand

   • Penelope E. Kellar
   • Charles R. Goldman

   OriginalPaper Pages: 269 - 281

4. Nitrogen fixation by Myrica gale root nodules Massachusetts wetland

   • Christa R. Schwintzer

   OriginalPaper Pages: 283 - 294

5. Complexity, stability and self-organization in natural communities

   • Robert E. Ulanowicz

   OriginalPaper Pages: 295 - 298

6. A model of leaf photosynthesis and respiration for predicting carbon dioxide assimilation in different environments

   • A. E. Hall

   OriginalPaper Pages: 299 - 316

7. Herbivory and predation by the mangrove tree crab Aratus pisonii

   • James W. Beever III
   • Daniel Simberloff
   • Linda L. King

   OriginalPaper Pages: 317 - 328

8. Reproductive potential of the earthworm Eisenia foetida

   • Roy Hartenstein
   • Edward F. Neuhauser
   • David L. Kaplan

   OriginalPaper Pages: 329 - 340

9. Selection affecting enzyme polymorphisms in laboratory populations of Drosophila melanogaster

   • J. G. Oakeshott

   OriginalPaper Pages: 341 - 354

10. Direct and indirect effects of n-species competition

    • Lawrence R. Lawlor

    OriginalPaper Pages: 355 - 364

11. The importance of carrying capacity, fertility, and viability for the competitive ability of populations

    • H. G. Wolf
    • K. Wöhrmann

    OriginalPaper Pages: 365 - 371

12. Awards for study at The Academy of Natural Sciences, Philadelphia, Pa.

    Announcement Pages: 372 - 372