1. Obituary Robert W. Pennak

   Obituary Pages: i - i

2. Aquatic resources in arid lands: Issues and opportunities

   • Rossana Sallenave
   • David E. Cowley

   Preface Pages: 343 - 345

3. A paleo perspective on hydroclimatic variability in the western United States

   • Connie A. Woodhouse

   Review Article Pages: 346 - 356

4. System dynamics modeling for community-based water planning: Application to the Middle Rio Grande

   • Vincent C. Tidwell
   • Howard D. Passell
   • Richard P. Thomas

   Research Article Pages: 357 - 372

5. Riparian corridors of Eastern Oregon and Washington: Functions and sustainability along lowland-arid to mountain gradients

   • Robert C. Wissmar

   Overview Article Pages: 373 - 387

6. River regulation, decline of ecological resources, and potential for restoration in a semi-arid lands river in the western USA

   • F. Richard Hauer
   • Mark S. Lorang

   Overview Article Pages: 388 - 401

7. Conservation genetics in aquatic species: General approaches and case studies in fishes and springsnails of arid lands

   • Carla Hurt
   • Philip Hedrick

   Overview Article Pages: 402 - 413

8. Characterization of environmental risk of genetically engineered (GE) organisms and their potential to control exotic invasive species

   • William Martin Muir
   • Richard Duncan Howard

   Overview Article Pages: 414 - 420

9. UV-B radiation increases cell permeability and damages nitrogen incorporation mechanisms in Nannochloropsis gaditana

   • Cristina Sobrino
   • Olimpio Montero
   • Luis M. Lubián

   Research Article Pages: 421 - 429

10. Phosphorus limitation of bacterial growth in high Arctic lakes and ponds

    • Wilhelm Granéli
    • Stefan Bertilsson
    • Aline Philibert

    Research Article Pages: 430 - 439

11. Peculiarities in the stable isotope composition of organisms from an alpine lake

    • Antonella Cattaneo
    • Marina Manca
    • Joseph B. Rasmussen

    Research Article Pages: 440 - 445

12. Spatially explicit estimates of erosion-risk indices and variable riparian buffer widths in watersheds

    • Robert C. Wissmar
    • W. Nicholas Beer
    • Raymond K. Timm II

    Research Article Pages: 446 - 455