, Volume 26, Issue 2, pp 475–485 | Cite as

Salinity controls on trophic interactions among invertebrates and algae of solar evaporation ponds in the Mojave Desert and relation to shorebird foraging and selenium risk



Three saline evaporation ponds formed by wastewater from a solar energy-generating facility near Harper Dry Lake in the Mojave Desert of California, USA were compared for differences in the communities of benthic and planktonic invertebrates and algae present along with avian visitation and foraging activity. Salinity of the ponds ranged from near 90 to over 200 g L−1 total dissolved solids. During the period of study (1997–1999), the lowest salinity pond averaged 98 g L−1, the intermediate salinity pond 112 g L−1, and the high salinity pond 173 g L−1. Differences in the biological communities, abundance of invertebrates and algae, and avian foraging were examined in relation to these differences in salinity. Only three aquatic invertebrate species were present in substantial numbers, a water boatman (Trichocorixa reticulata), a brine shrimp (Artemia franciscana), and a brine fly (Ephydra gracilis). An abundance of the predator Trichocorixa under low salinity conditions appeared to reduce algae-grazing Artemia, and so released phytoplankton growth, but this was observed only in surveys later in the growth season when populations were mature and had greatest potential for efficient consumption of resources. Brine fly larvae were also fed upon by Trichocorixa and were least abundant in the low salinity pond. At highest salinities where Trichocorixa could not survive, Artemia were abundant and waters were usually clear, becoming dense with phytoplankton only during the winter dormancy of brine shrimp. Intermediate salinity levels supported some water boatmen, often coexisting with dense brine shrimp and phytoplankton populations, and the greatest dry mass of benthic brine fly larvae and pupae. The high salinity pond produced abundant but small Ephydra larvae and pupae, accompanied by reduced emergence success of adult flies. Birds appeared to forage primarily on benthic brine fly larvae and were most successful in the intermediate salinity pond, possibly because lower salinity resulted in loss of this preferred prey to water boatman predation, and high salinity produced prey of poor quality. These observations suggest that reduced salinity may at times mediate a trophic cascade within a simple food chain, where an invertebrate predator may reduce primary consumers and permit enhanced algal density, but the predation control becomes uncoupled as salinity increases. In the case of the ponds studied here, there appeared to be minimal risk associated with selenium poisoning of water birds because Se was not detected in brine fly larvae or pupae and was found only occasionally in low content in the brine shrimp and corixids and mostly in locales where few birds were found feeding.

Key Words

Artemia Ephydra evaporation ponds predation risk assessment saline wetlands salinity selenium shorebird foraging Trichocorixa trophic cascade wastewater 


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Literature Cited

  1. Anderson, W. 1970. A preliminary study of the relationship of saltponds and wildlife—South San Francisco Bay. California Fish and Game 56: 240–252.Google Scholar
  2. Besser, J. M., J. N. Huckins, E. E. Little, and T. W. La Point. 1989. Distribution and bioaccumulation of selenium in aquatic microcosms. Environmental Pollution 62: 1–12.CrossRefPubMedGoogle Scholar
  3. Borer, E. T., E. W. Seabloom, J. B. Shurin, K. E. Anderson, C. A. Blanchette, B. Broitman, S. D. Cooper, and B. S. Halpern. 2005. What determines the strength of a trophic cascade? Ecology 86: 528–537.CrossRefGoogle Scholar
  4. Brix, K. V., D. K. DeForest, R. D. Cardwell, and W. J. Adams. 2004. Derivation of a chronic site-specific water quality standard for selenium in the Great Salt Lake, Utah, USA. Environmental Toxicology and Chemistry 23: 606–612CrossRefPubMedGoogle Scholar
  5. Brix, K. V., J. S. Volosin, W. J. Adams, R. J. Reash, R. G. Carlton, and D. O. McIntyre. 2001. Effects of sulfate on the acute toxicity of selenate to freshwater organisms. Environmental Toxicology and Chemistry 20: 1037–1045.CrossRefPubMedGoogle Scholar
  6. Carpelan, L. H. 1957. Hydrobiology of the Alviso salt ponds. Ecology 38: 382–385.CrossRefGoogle Scholar
  7. Carpenter, S. R. and J. F. Kitchell. 1988. Cosumer control of lake productivity. BioScience 38: 764–769.CrossRefGoogle Scholar
  8. Cieminski, K. L. and L. D. Flake. 1995. Invertebrate fauna of wastewater ponds in southeastern Idaho. Great Basin Naturalist 55: 105–116.Google Scholar
  9. Collins, N. C. 1980. Developmental responses to food limitation as indicators of environmental conditions for Ephydra cinerea Jones (Diptera). Ecology 61: 650–661.CrossRefGoogle Scholar
  10. Cox, R. R. and J. A. Kadlec. 1995. Dynamics of potential waterfowl foods in Great Salt Lake marshes during summer. Wetlands 15: 1–8.CrossRefGoogle Scholar
  11. Dana, G. L., R. Jellison, J. M. Melack, and G. L. Starrett. 1993. Relationships between Artemia monica life history characteristics and salinity. Hydrobiologia 263: 129–143.CrossRefGoogle Scholar
  12. Euliss, N. H., R. L. Jarvis, and D. S. Gilmer. 1991a. Feeding ecology of waterfowl wintering on evaporation ponds in California. Condor 93: 582–590.CrossRefGoogle Scholar
  13. Euliss, N. H., R. L. Jarvis, and D. S. Gilmer. 1991b. Standing crops and ecology of aquatic invertebrates in agricultural drainwater ponds in California. Wetlands 11: 179–190.Google Scholar
  14. Forsythe, B. L. and S. J. Klaine. 1974. The interaction of sulfate and selenate (Se+6) effects on brine shrimp, Artemia spp. Chemosphere 29: 789–800.CrossRefGoogle Scholar
  15. Gilchrist, B. M. 1960. Growth and form of the brine shrimp Artemia salina (L.). Proceedings of the Zoological Society of London 134: 221–235.Google Scholar
  16. Grayson, D. G. 1993. The Desert’s Past—a Natural Prehistory of the Great Basin. Smithsonian Institution Press, Washington, DC, USA.Google Scholar
  17. Hammer, U. T. 1986. Saline Lake Ecosystems of the World. Junk, Dordrecht, The Netherlands.Google Scholar
  18. Hammer, U. T. and S. H. Hurlbert. 1992. Is the absence of Artemia determined by the presence of predators or by lower salinity in some saline waters? p. 91–102. In R. D. Robarts and M. L. Bothwell (eds.) Aquatic Ecosystems in Semi-Arid Regions: Implications for Resource Management. N.H.R.I. Syposium Series 7, Environment Canada, Saskatoon, Saskatchewan, Canada.Google Scholar
  19. Hansen, L. D., K. J. Maier, and A. W. Knight. 1993. The effect of sulfate on the bioconcentration of selenate by Chironomus decorus and Daphnia magna. Archives of Environmental Contamination and Toxicology 25: 72–78.CrossRefGoogle Scholar
  20. Heinz, G. H. 1996. Selenium in birds. p. 453–464. In W. N. Beyer, G. H. Heinz, and A. W. Redmon (eds.) Interpreting Environmental Contaminants in Animal Tissues. Lewis Publishers, Boca Raton, FL, USA.Google Scholar
  21. Herbst, D. B. 1986. Comparative studies of the population ecology and life history patterns of an alkaline salt lake insect: Ephydra (Hydropyrus) hians Say (Diptera: Ephydridae). Ph.D. Dissertation. Oregon State University, Corvallis, OR, USA.Google Scholar
  22. Herbst, D. B. 1988. Comparative population ecology of Ephydra hians Say (Diptera: Ephydridae) at Mono Lake (California) and Abert Lake (Oregon). Hydrobiologia 158: 145–166.CrossRefGoogle Scholar
  23. Herbst, D. B. 1992. Changing lake level and salinity at Mono Lake: habitat conservation problems for the benthic alkali fly. p. 198–210. In The History of Water, White Mountain Research Station symposium vol. 4. University of California, Los Angeles, CA, USA.Google Scholar
  24. Herbst, D. B. 1999. Biogeography and physiological adaptations of the brine fly genus Ephydra (Diptera: Ephydridae) in saline waters of the Great Basin. Great Basin Naturalist 59: 127–135.Google Scholar
  25. Herbst, D. B. 2001. Gradients of salinity stress, environmental stability and water chemistry as a templet for defining habitat types and physiological strategies in inland salt waters. Hydrobiologia 466: 209–219.CrossRefGoogle Scholar
  26. Herbst, D. B. and D. W. Blinn. 1998. Experimental mesocosm studies of salinity effects of the benthic algal community of a saline lake. Journal of Phycology 34: 772–778.CrossRefGoogle Scholar
  27. Hunter, M. D. and P. W. Price. 1992. Playing chutes and ladders: heterogeneity and the relative roles of bottom-up and top-down forces in natural communities. Ecology 73: 724–732.Google Scholar
  28. Javor, B. 1989. Hypersaline Environments: Microbiology and Biogeochemistry. Springer-Verlag, Berlin, Germany.Google Scholar
  29. Jehl, J. R., Jr. 1994. Changes in saline and alkaline lake avifaunas in western North America in the past 150 years. Studies in Avian Biology 15: 258–272.Google Scholar
  30. Lonzarich, D. G. and J. J. Smith. 1997. Water chemistry and community structure of saline and hypersaline salt evaporation ponds in San Francisco Bay, California. California Fish and Game 83: 89–104.Google Scholar
  31. Luoma, S. N., C. Johns, N. S. Fisher, N. A. Steinberg, R. S. Oremland, and J. Reinfelder. 1992. Determination of selenium bioavailability to a benthic bivalve from particulate and solute pathways. Environmental Science and Technology 26: 485–491.CrossRefGoogle Scholar
  32. Nemenz, H. 1960. On the osmotic regulation of the larvae of Ephydra cinerea. Journal of Insect Physiology 4: 38–44.CrossRefGoogle Scholar
  33. Ohlendorf, H. M., D. J. Hoffman, M. K. Saiki, and T. M. Aldrich. 1986. Embryonic mortality and abnormalities of aquatic birds: apparent impacts of selenium from irrigation drainwater. The Science of the Total Environment 52: 49–63.CrossRefGoogle Scholar
  34. Power, M. E. 1992. Top-down and bottom-up forces in food webs: do plants have primacy? Ecology 73: 733–746.CrossRefGoogle Scholar
  35. Rosetta, T. N. and A. W. Knight. 1995. Bioaccumulation of selenate, selenite, and seleno-DL-methionine by the brine fly larvae Ephydra cinerea Jones. Archives of Environmental Contamination and Toxicology 29: 351–357.CrossRefGoogle Scholar
  36. Rubega, M. A. and C. Inouye. 1994. Switching in phalaropes: feeding limitations, the functional response and water policy at Mono Lake, CA. Biological Conservation 70: 205–210.CrossRefGoogle Scholar
  37. Saiki, M. K. and T. P. Lowe. 1987. Selenium in aquatic organisms from subsurface agricultural drainage water, San Joaquin Valley, California. Archives Environmental Contamination and Toxicology 16: 657–670.CrossRefGoogle Scholar
  38. Scudder, G. G. E. 1976. Water boatmen of saline waters (Hemiptera: Corixidae). p. 263–289. In L. Cheng (ed.) Marine Insects. North-Holland Publishing Company, Amsterdam, The Netherlands.Google Scholar
  39. Sherwood, J. E., F. Stagnitti, M. J. Kokkinn, and W. D. Williams. 1992. A standard table for predicting equilibrium oxygen concentrations in salt lakes dominated by sodium chloride. International Journal Salt Lake Research 1: 1–6.CrossRefGoogle Scholar
  40. Skorupa, J. P. 1998a. Selenium. p. 139–184. In Guidelines for Interpretation of the Biological Effects of Selected Constituents in Biota, Water, and Sediment. Information report no. 3, National Irrigation Water Quality Program, U.S. Department of Interior, Denver, CO, USA.Google Scholar
  41. Skorupa, J. P. 1998b. Selenium poisoning of fish and wildlife in nature: lessons from twelve real-world examples. p. 315–354. In W. T. Frankenberger and R. A. Engberg (eds.) Environmental Chemistry of Selenium. Marcel Dekker, Inc., New York, NY, USA.Google Scholar
  42. Skorupa, J. P. and H. M. Ohlendorf. 1991. Contaminants in drainage water and avian risk thresholds. p. 345–368. In A. Dinar and D. Zelberman (eds.) The Economics and Management of Water and Drainage in Agriculture. Kluwer Academic Publishers, Boston, MA, USA.Google Scholar
  43. Strong, D. R. 1992. Are trophic cascades all wet? Differentiation and donor-control in speciose ecosystems. Ecology 73: 747–754.CrossRefGoogle Scholar
  44. Takekawa, J. Y., C. T. Lu, and R. T. Pratt. 2001. Avian communities in baylands and artificial salt evaporation ponds of the San Francisco Bay estuary. Hydrobiologia 466: 317–328.CrossRefGoogle Scholar
  45. Tanner, R., E. P. Glenn, and D. Moore. 1999. Food chain organisms in hypersaline, industrial evaporation ponds. Water Environment Research 71: 494–505.CrossRefGoogle Scholar
  46. Warnock, N., G. W. Page, T. D. Ruhlen, N. Nur, J. Y. Takekawa, and J. T. Hanson. 2002. Management and conservation of San Francisco Bay salt ponds: effects of pond salinity, area, tide, and season on Pacific Flyway waterbirds. Waterbirds 25 (Special Publication) 2: 79–92.Google Scholar
  47. Wetzel, R. G. and G. E. Likens. 1991. Limnological Analyses, second edition. Springer-Verlag, New York, NY, USA.Google Scholar
  48. Wollheim, W. M. and J. R. Lovvorn. 1995. Salinity effects on macroinvertebrate assemblages and waterbird food webs in shallow lakes of the Wyoming High Plains. Hydrobiologia 310: 207–223.CrossRefGoogle Scholar
  49. Wurtsbaugh, W. A. 1992. Food-web modification by an invertebrate predator in the Great Salt Lake (USA). Oecologia 89: 168–175.Google Scholar

Copyright information

© Society of Wetland Scientists 2006

Authors and Affiliations

  1. 1.Sierra Nevada Aquatic Research LaboratoryUniversity of CaliforniaMammoth LakesUSA

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