Physiological ecology of phytoplankton and bacteria; trace element biogeochemistry; biological monitors of river pollution; plant herbivore interactions in streams; the effect of acidic precipitation on aquatic ecosystems.

1. Wehr, J.D. 1981. Analysis of seasonal succession of attached algae in a mountain stream, the North Alouette River, British Columbia. Can J Botany 59: 1465-1474.

2. Wehr, J.D., Say. P.J. & Whitton, B.A. 1981. Heavy metals in an industrially polluted river, the Team. pp. 99-107. In: Heavy Metals in Northern England: Environmental and Biological Aspects. P.J. Say & B.A. Whitton (eds.), University of Durham Press, England.

3. Whitton, B.A., Say, P.J. & Wehr, J.D. 1981. Use of plants to monitor heavy metals in rivers. pp. 125-145. In: Heavy Metals in Northern England: Environmental and Biological Aspects. P.J. Say & B.A. Whitton (eds.), University of Durham Press, England.

4. Wehr, J.D. & Whitton, B.A. 1983. Aquatic cryptogams of natural acid springs enriched with heavy metals: the Kootenay Paint Pots, British Columbia. Hydrobiologia 98: 97-105.

5. Wehr, J.D., Empain, A., Mouvet, C., Say, P.J. & Whitton, B.A. 1983. Methods for process­ing aquatic mosses used as monitors of heavy metals. Water Res 17: 985-992.

6. Wehr, J.D. & Whitton, B.A. 1983. Accumulation of heavy metals by aquatic mosses. 2. Rhynchostegium riparioides. Hydrobiologia 100: 261-284.

7. Wehr, J.D. & Whitton, B.A. 1983. Accumulation of heavy metals by aquatic mosses. 3. Seasonal changes. Hydrobiologia 100: 285-291.

8. Wehr, J.D., & Stein, J.R. 1985. Studies on the autecology and biogeography of the freshwater brown alga Heribaudiella fluviatilis (Aresch.) Sved. Journal of Phycology 21: 81-93.

9. Wehr, J.D., Brown, L.M. & O'Grady, K, 1985. Physiological ecology of the bloom-forming alga Chrysochromulina breviturrita Nich. (Prymnesiophyceae) from lakes influenced by acid precipitation. Can J Botany 67: 2231-39.

10. Wehr, J.D. & Brown, L.M. 1985. Selenium requirement of a bloom-forming planktonic alga from softwater and acidified lakes. Can J Fish Aquat Sci 42: 1783-1788.

11. Wehr, J.D. & Brown, L.M. 1986. Hydrogen ion buffering of culture media for algae from moderately acidic, oligotrophic waters. J Phycology 22: 88-94.

12. Brown, L.M. and Wehr, J.D. 1986. Development of selenium analysis methodology at ng/L levels for soft waters subject to acidic precipitation. Proc Technol Transfer Conf 7: 97-110.

13. Wehr, J.D. and Whitton, B.A. 1986. Ecological factors relating to morphological variation in the aquatic moss Rhynchostegium riparioides. J Bryology 14: 269-280.

14. Wehr, J.D., Brown, L.M. & O'Grady, K. 1987. Highly specialized nitrogen metabolism in a freshwater phytoplankter, Chrysochromulina breviturrita. Can J Fish Aquat Sci 44: 736-742.

15. Wehr, J.D., Kelly, M.G. & Whitton, B.A. 1987. Factors affecting accumulation and loss of zinc by the aquatic moss Rhynchostegium riparioides (Hedw.) C. Jens. Aquat Bot 29: 261-274.

16. Wehr, J.D. 1989. Experimental tests of nutrient limitation in freshwater picoplankton. Appl Environ Microbiol 55: 1605-1611.

17. Wehr, J.D. 1990. Predominance of picoplankton and nanoplankton in eutrophic Calder Lake. Hydrobiologia 203: 35-44.

18. Wehr, J.D. 1991. Nutrient- and grazer-mediated effects on picoplankton and size structure in phytoplankton communities. Int Rev Ges Hydrobiol 76: 643-656.

19. Toolan, T., Findlay, S., & Wehr, J.D. 1991. Inorganic phosphorus stimulation of bacterio­plankton production in a meso-eutrophic lake. Applied and Environmental Microbiology 57: 2074-2078.

20. Samaritan, J.M., J.D. Wehr, A. Buccafuri, & M. Sahn. 1992. Automated measurement of aque­ous aluminum by the pyrocatechol violet method. International Journal of Environmental Analytical Chemistry 50: 173-182.

21. Wehr, J.D. 1992. Effects of experimental manipulations of light and phosphorus supply on competition among picoplankton and nanoplankton in an oligotrophic lake. Can J Fish Aquat Sci 50: 936-945.

22. Wehr, J.D. 1993. [Review of] Progress in phycological research, Volumes 7 and 8. J Appl Phycol 5: 477-480.

23. Wehr, J.D. J. Le, & Campbell, L 1994. Does microbial biomass affect pelagic ecosystem efficiency? An experimental study. Microb Ecol 27: 1-17.

24. Le, J., J.D. Wehr, & Campbell, L. 1994. Uncoupling of bacterioplankton and phytoplankton production in fresh waters is affected by inorganic nutrient limitation. Appl Environ Microbiol 60: 2086-2093.

25. Thorp, J.H., A.R. Black, K.H. Haag, & J.D. Wehr. 1994. Zooplankton assemblages in the Ohio River: seasonal, tributary, and navigation dam effects. Can J Fish Aquat Sci 51: 1634-1643.

26. Wehr, J.D. & J.H. Thorp. 1997. Impacts of navigation dams, tributaries and littoral zones on phytoplankton communities in the Ohio River. Can J Fish Aquat Sci 54: 378-395.

27. Wehr, J.D., S.P. Lonergan, & J.H. Thorp. 1997. Concentrations and controls of dissolved organic matter in a constricted-channel region of the Ohio River. Biogeochemistry 38: 41 – 65.

28. Wehr, J.D. & Descy, J.-P. 1998. Use of phytoplankton in large river management. Journal of Phycology 34: 741-749.
29. Wehr, J.D., Holen, D.A. MacDonald, M.M.& Lonergan, S.P. 1998. Effects of different carbon sources on a freshwater plankton community. Can. J. Fish. Aquat. Sciences 55: 2150-2160.

30. Wehr, J.D., Petersen, J., & Findlay, S. 1999. Influence of three contrasting detrital carbon sources on planktonic bacterial metabolism in a mesotrophic lake. Microb Ecol 37: 23-35.

31. Wigand, C., Wehr, J.D., Limburg, K., Gorham, B., Lonergan, S., & Findlay, S. 2000. Effect of Vallisneria americana on community structure and ecosystem function in lake mesocosms. Hydrobiologia 418: 137-146.

32. Wehr, J.D. 2002. Phylum Phaeophyta. In: John, D., A.J. Brook, & B.A. Whitton [Eds.], Freshwater Algal Flora of the British Isles, Cambridge Univ. Press; pp. 278-280.

33. Wehr, J.D. & A.A. Perrone. 2003. A new record of Heribaudiella fluviatilis, a freshwater brown alga (Phaeophyceae) from Oregon. Western North Am Naturalist.63: 517-523.

34. Sheath, R.G, & Wehr, J.D. 2003. Introduction to Freshwater Algae, pp. 1-9, In: Freshwater Algae of North America: Ecology and Classification. Academic Press, San Diego, CA.

35. Wehr, J.D. & Sheath, R.G. 2003. Freshwater Habitats of Algae. pp. 11-57, In: Freshwater Algae of North America: Ecology and Classification. Academic Press, San Diego, CA.

36. Wehr, J.D. 2003. Brown Algae. pp. 757-773, In: Freshwater Algae of North America: Ecology and Classification. Academic Press, San Diego, CA.

37. Huss, A.A. & Wehr, J.D. 2004. Strong indirect effects of a submersed aquatic macrophyte, Vallisneria americana, on bacterioplankton densities in a mesotrophic lake. Microb Ecol 47: 305-315.

38. Kostel-Hughes, F., Young, T.P., & Wehr, J.D. 2004. Effects of leaf litter depth on the emergence and seedling growth of deciduous forest tree species in relation to seed size. J Torrey Botanical Soc In press.

Books
Senior Editor,

Wehr, J.D. & Sheath, R.G. [Eds.] 2003. Freshwater Algae of North America: Ecology and Classification (24 chapters), Academic Press, San Diego, CA. 950 pp.