Effects of coalbed natural gas development on fish assemblages in tributary streams of the Powder and Tongue rivers

Summary 1. Extraction of coalbed natural gas (CBNG) often results in disposal of large quantities of CBNG product water, which may affect aquatic ecosystems. We evaluated the effects of CBNG development on fish assemblages in tributary streams of the Powder and Tongue rivers. We used treatment and control, impact versus reference sites comparisons, surveys of CBNG product-water streams and in situ fish survival approaches to determine if CBNG development affected fish assemblages. 2. Several of our results suggested that CBNG development did not affect fish assemblages. Species richness and index of biotic integrity (IBI) scores were similar in streams with and streams without CBNG development, and overall biotic integrity was not related to the number or density of CBNG wells. Fish occurred in one stream that was composed largely or entirely of CBNG product water. Sentinel fish survived in cages at treatment sites where no or few fish were captured, suggesting that factors such as lack of stream connectivity rather than water quality limited fish abundance at these sites. Fish species richness did not differ significantly from 1994 to 2006 in comparisons of CBNG-developed and undeveloped streams. Biotic integrity declined from 1994 to 2006; however, declines occurred at both impact and reference sites, possibly because of long-term drought. 3. Some evidence suggested that CBNG development negatively affected fish assemblages, or may do so over time. Specific conductivity was on average higher in treatment streams and was negatively related to biotic integrity. Four IBI species richness metrics were negatively correlated with the number or density of CBNG wells in the catchment above sampling sites. Bicarbonate, one of the primary ions in product water, was significantly higher in developed streams and may have limited abundance of longnose dace (Rhinichthys cataractae). Total dissolved solids, alkalinity, magnesium and sulphate were significantly higher in developed streams. 4. Biological monitoring conducted before the development of CBNG, and continuing through the life of development and reclamation, together with data on the quantity, quality and fate of CBNG product water will allow robust assessment of potential effects of future CBNG development worldwide.

[1]  Alexander V. Zale,et al.  A Review of the Potential Effects of Coal Bed Natural Gas Development Activities on Fish Assemblages of the Powder River Geologic Basin , 2009 .

[2]  G. Wilde,et al.  The Role of Salinity in Structuring Fish Assemblages in a Prairie Stream System , 2005, Hydrobiologia.

[3]  A. Zale,et al.  Development and Evaluation of a Fish Assemblage Index of Biotic Integrity for Northwestern Great Plains Streams , 2005 .

[4]  B. Brooks,et al.  Water Quality of Effluent-dominated Ecosystems: Ecotoxicological, Hydrological, and Management Considerations , 2006, Hydrobiologia.

[5]  G. Wilde,et al.  Changes in Prairie Stream Fish Assemblages Restricted to Isolated Streambed Pools , 2004 .

[6]  James R. Karr,et al.  Biological Assessment and Criteria Improve Total Maximum Daily Load Decision Making , 2004 .

[7]  W. J. Matthews,et al.  Life on the Edge: The Ecology of Great Plains Prairie Streams , 2004 .

[8]  W. Williams.  Anthropogenic salinisation of inland waters , 2001, Hydrobiologia.

[9]  Q. Skinner,et al.  COALBED METHANE PRODUCT WATER CHEMISTRY IN THREE WYOMING WATERSHEDS 1 , 2003 .

[10]  Wayne A. Van Voast,et al.  Geochemical signature of formation waters associated with coalbed methane , 2003 .

[11]  G. Wilde,et al.  Seasonal and spatial variation in a prairie stream-fish assemblage , 2002 .

[12]  K. M. Ogle,et al.  Water quality and environmental isotopic analyses of ground-water samples collected from the Wasatch and Fort Union Formations in areas of coalbed methane development : implications to recharge and ground-water flow, eastern Powder River basin, Wyoming , 2002 .

[13]  J. Metesh,et al.  Potential Ground-Water Drawdown and Recovery from Coalbed Methane Development in the Powder River Basin, Montana , 2002 .

[14]  J. Bence,et al.  TEMPORAL AND SPATIAL VARIATION IN ENVIRONMENTAL IMPACT ASSESSMENT , 2001 .

[15]  Kenneth G. Gerow,et al.  Effort Needed to Estimate Species Richness in Small Streams on the Great Plains in Wyoming , 2000 .

[16]  F. Rahel,et al.  Using Historical Data to Assess Changes in Wyoming’s Fish Fauna , 1998 .

[17]  D. Mount,et al.  Statistical models to predict the toxicity of major ions to Ceriodaphnia dubia, Daphnia magna and Pimephales promelas (fathead minnows) , 1997 .

[18]  C. J. Mankin,et al.  Energy and Mineral Resources of the Great Plains , 1995 .

[19]  H. Bergman,et al.  Environmental effects of saline oil‐field discharges on surface waters , 1992 .

[20]  K. Fausch,et al.  Fishes, Macroinvertebrates, and Aquatic Habitats of the Purgatoire River in Pinon Canyon, Colorado , 1991 .

[21]  K. Fausch,et al.  Disturbance and Fish Communities in Intermittent Tributaries of a Western Great Plains River , 1991 .

[22]  Wayne A. Hubert,et al.  Fish Assemblages and Habitat Gradients in a Rocky Mountain–Great Plains Stream: Biotic Zonation and Additive Patterns of Community Change , 1991 .

[23]  M. Trett,et al.  The Fate and Effects of Oil in Freshwater , 1989, Springer Netherlands.

[24]  R. R. Wallace.  A REVIEW OF OIL AND BIOLOGICAL COMMUNITY RESPONSES IN NORTHERN RIVERS , 1987 .

[25]  James R. Karr,et al.  Regional Application of an Index of Biotic Integrity Based on Stream Fish Communities , 1984 .

[26]  T. C. Dorris,et al.  Stream Order and Species Diversity of Fishes in an Intermittent Oklahoma Stream , 1967 .

[27]  D. S. Rawson,et al.  THE SALINE LAKES OF SASKATCHEWAN , 1944 .