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• 181. [Image] Histopathological changes in gills of Lost River suckers (Deltistes luxatus) exposed to elevated ammonia and elevated pH

  	Lease, Hilary M., Histopathological Changes in Gills of Lost River Suckers (Deltistes luxatus) Exposed to Elevated Ammonia and Elevated pH, M.S., Department of Zoology and Physiology, December, 2000. ...
  	Citation × Citation Citation Abstract Copy Title: Histopathological changes in gills of Lost River suckers (Deltistes luxatus) exposed to elevated ammonia and elevated pH Author: Lease, Hilary Marian Year: 2000, 2008, 2005 Lease, Hilary M., Histopathological Changes in Gills of Lost River Suckers (Deltistes luxatus) Exposed to Elevated Ammonia and Elevated pH, M.S., Department of Zoology and Physiology, December, 2000. The Lost River sucker {Deltistes luxatus) is a federally listed, endangered fish species endemic to Upper Klamath Lake?a large, shallow hypereutrophic lake in southern Oregon. Sucker population declines in the lake over the past few decades are thought to be partly attributable to extreme water quality conditions, including elevated ammonia concentrations and elevated pH, that occur during summer cyanobacterial blooms. I analyzed structural changes in gills of larval Lost River suckers after they were exposed to elevated pH and elevated ammonia concentrations in chronic toxicity tests conducted in the laboratory. Histopathological changes in sucker lamellae were observed at ammonia concentrations that did not significantly decrease survival, growth, whole-body ion content, or swimming performance. Structural changes that I evaluated included O2 diffusion distance, lamellar thickness, hyperplasic and hypertrophic mucous cells, and infiltration of white blood cells into the lymphatic space. The increases in diffusion distance and lamellar thickness were statistically significant (P < 0.05). These gill changes are indicative of potentially compromised respiratory and ionoregulatory capacity. Because in this species gill structural changes appear to be a more sensitive indicator of stress in eutrophic water quality conditions than are the more traditional sublethal indices, gill histopathology might be useful for monitoring the health of Lost River suckers in Upper Klamath Lake. Title: Histopathological changes in gills of Lost River suckers (Deltistes luxatus) exposed to elevated ammonia and elevated pH Author: Lease, Hilary Marian Year: 2000, 2008, 2005 Lease, Hilary M., Histopathological Changes in Gills of Lost River Suckers (Deltistes luxatus) Exposed to Elevated Ammonia and Elevated pH, M.S., Department of Zoology and Physiology, December, 2000. The Lost River sucker {Deltistes luxatus) is a federally listed, endangered fish species endemic to Upper Klamath Lake?a large, shallow hypereutrophic lake in southern Oregon. Sucker population declines in the lake over the past few decades are thought to be partly attributable to extreme water quality conditions, including elevated ammonia concentrations and elevated pH, that occur during summer cyanobacterial blooms. I analyzed structural changes in gills of larval Lost River suckers after they were exposed to elevated pH and elevated ammonia concentrations in chronic toxicity tests conducted in the laboratory. Histopathological changes in sucker lamellae were observed at ammonia concentrations that did not significantly decrease survival, growth, whole-body ion content, or swimming performance. Structural changes that I evaluated included O2 diffusion distance, lamellar thickness, hyperplasic and hypertrophic mucous cells, and infiltration of white blood cells into the lymphatic space. The increases in diffusion distance and lamellar thickness were statistically significant (P < 0.05). These gill changes are indicative of potentially compromised respiratory and ionoregulatory capacity. Because in this species gill structural changes appear to be a more sensitive indicator of stress in eutrophic water quality conditions than are the more traditional sublethal indices, gill histopathology might be useful for monitoring the health of Lost River suckers in Upper Klamath Lake. Close

• 182. [Image] Draft resource management plan/environmental impact statement for the Upper Klamath Basin

  	"March 1994."
  	Citation × Citation Citation Abstract Copy Title: Draft resource management plan/environmental impact statement for the Upper Klamath Basin Author: United States. Bureau of Land Management. Klamath Falls Resource Area Office Year: 1994, 2005 "March 1994." Title: Draft resource management plan/environmental impact statement for the Upper Klamath Basin Author: United States. Bureau of Land Management. Klamath Falls Resource Area Office Year: 1994, 2005 "March 1994." Close

• 183. [Image] Effects of the drought on small business and agriculture : hearings before the Select Committee on Small Business, United States Senate, Ninety-fifth Congress, first session ... Klamath Falls, Oreg., August 16, 1977, Burns, Oreg., August 17, 1977

  	CONTENTS Statement of?©ag!, Anklin, William 2620 115 Barnett, Hon. Leo, Judge, Gilliam County, Oreg 2620 196 Chapman, James, president, Klamath Cattlemen's Association, Inc., Klamath Falls, Oreg ...
  	Citation × Citation Citation Abstract Copy Title: Effects of the drought on small business and agriculture : hearings before the Select Committee on Small Business, United States Senate, Ninety-fifth Congress, first session ... Klamath Falls, Oreg., August 16, 1977, Burns, Oreg., August 17, 1977 Author: United States. Congress. Senate. Select Committee on Small Business Year: 1977, 2005, 2004 CONTENTS Statement of?©ag!, Anklin, William 2620 115 Barnett, Hon. Leo, Judge, Gilliam County, Oreg 2620 196 Chapman, James, president, Klamath Cattlemen's Association, Inc., Klamath Falls, Oreg 269 112 Cockram, Fred J., president, Oregon Dairymen's Association 2620 116 Cody, Jim, District Director, Farmers Home Administration, Port land, Oreg 2620 184 Eisgruber, Ludwig M., professor and head of the Department of Agri cultural and Resource Economics, School of Agriculture, Oregon State University 2620 118 Flitcraft, Hon. George C, Mayor, city of Klamath Falls, Klamath Falls, Oreg 2620 1 Fujii, Howard, manager, Public Affairs, Oregon Farm Bureau Fed eration 2620 170 Gift, Lloyd 2620 110 Goertzen, Victor, Assistant District Director, Management Assistance, Boise District Office, U.S. Small Business Administration 2620 189 Graham, Jack, coordinator, Agricultural Drought Office, State of Oregon 2620 174 Hagelstein, Fred, assistant director, Oregon State University Exten sion Service, Corvallis, Oreg 2620 39 Hawkins, Bert, president, Oregon Cattlemen's Association, Ontario, Oreg 2620 5 Hernandez, Richard, Associate Administrator for Operation- U.S. Small Business Administration, accompanied by J. Don Chapman, District Director, Portland District Office, SBA 2620 74 Huff, Bert, regional vice president, First National Bank of Oregon, Portland, Oreg 2620 129 Johnson, Samuel, member of the legislature, Klamath County, Oreg 2620 5 Langley, Dwight, representing Baker County Livestock Association, Baker, Oreg 2620 157 Mayer, William H., Regional Director, Federal Disaster Assistance Administration, Region 10, Seattle, Wash 2620 94 Miller, Tad, president, Oregon Wheat Growers League, Pendleton, Oreg., accompanied by Wes Grilley 2620 160 Nicholson, Mr 2620 110 Otley, Charles, past president, Oregon Cattlemen's Association 2620 196 Ross, Bill, first vice president, Oregon Cattlemen's Association 2620 146 Sehorn, Talbert D., State Executive Director, Agricultural Stabiliza tion and Conservation Service, U.S. Department of Agriculture 2620 103 Sitz, James H., president, Harney County Stockgrowers, Drewsey, Oreg 2620 197 Skinner, Bob, president, Malheur County Livestock Association 2620 151 Smith, Earl, member, State Department of Agriculture, Salem, Oreg 2620 140 Storms, Murl W., State Director, Oregon State Office, Bureau of Land Management, Portland, Oreg 2620 65 Thorne, Raymond P., Board of County Commissioners, County Commissioners Chambers, Klamath County Courthouse Annex, Klamath Falls, Oreg 2620 2 White, Hon. Dale, County Judge for Harney County, Burns, Oreg- 2620 134 Williams, Gary, representing the Oregon Wool Growers Association._ 21 Zinn, Thomas G., Wasco County Extension Agent, Oregon State Uni versity Extension Service 2620 48 (in) IV APPENDIX Statement of Edward Peile, president, Jackson County Stockmen's As- sociation 2620 201 Statement of Mike Hanley, Jordan Valley, Oreg 2620 201 Statement of Gene Officer, president, Grant County Stockgrowers Asso ciation, Canyon City, Oreg 2620 204 HEARING DATES August 16, 1977: Afternoon session 2620 1 August 17,1977: Afternoon session 2620 133 Title: Effects of the drought on small business and agriculture : hearings before the Select Committee on Small Business, United States Senate, Ninety-fifth Congress, first session ... Klamath Falls, Oreg., August 16, 1977, Burns, Oreg., August 17, 1977 Author: United States. Congress. Senate. Select Committee on Small Business Year: 1977, 2005, 2004 CONTENTS Statement of?©ag!, Anklin, William 2620 115 Barnett, Hon. Leo, Judge, Gilliam County, Oreg 2620 196 Chapman, James, president, Klamath Cattlemen's Association, Inc., Klamath Falls, Oreg 269 112 Cockram, Fred J., president, Oregon Dairymen's Association 2620 116 Cody, Jim, District Director, Farmers Home Administration, Port land, Oreg 2620 184 Eisgruber, Ludwig M., professor and head of the Department of Agri cultural and Resource Economics, School of Agriculture, Oregon State University 2620 118 Flitcraft, Hon. George C, Mayor, city of Klamath Falls, Klamath Falls, Oreg 2620 1 Fujii, Howard, manager, Public Affairs, Oregon Farm Bureau Fed eration 2620 170 Gift, Lloyd 2620 110 Goertzen, Victor, Assistant District Director, Management Assistance, Boise District Office, U.S. Small Business Administration 2620 189 Graham, Jack, coordinator, Agricultural Drought Office, State of Oregon 2620 174 Hagelstein, Fred, assistant director, Oregon State University Exten sion Service, Corvallis, Oreg 2620 39 Hawkins, Bert, president, Oregon Cattlemen's Association, Ontario, Oreg 2620 5 Hernandez, Richard, Associate Administrator for Operation- U.S. Small Business Administration, accompanied by J. Don Chapman, District Director, Portland District Office, SBA 2620 74 Huff, Bert, regional vice president, First National Bank of Oregon, Portland, Oreg 2620 129 Johnson, Samuel, member of the legislature, Klamath County, Oreg 2620 5 Langley, Dwight, representing Baker County Livestock Association, Baker, Oreg 2620 157 Mayer, William H., Regional Director, Federal Disaster Assistance Administration, Region 10, Seattle, Wash 2620 94 Miller, Tad, president, Oregon Wheat Growers League, Pendleton, Oreg., accompanied by Wes Grilley 2620 160 Nicholson, Mr 2620 110 Otley, Charles, past president, Oregon Cattlemen's Association 2620 196 Ross, Bill, first vice president, Oregon Cattlemen's Association 2620 146 Sehorn, Talbert D., State Executive Director, Agricultural Stabiliza tion and Conservation Service, U.S. Department of Agriculture 2620 103 Sitz, James H., president, Harney County Stockgrowers, Drewsey, Oreg 2620 197 Skinner, Bob, president, Malheur County Livestock Association 2620 151 Smith, Earl, member, State Department of Agriculture, Salem, Oreg 2620 140 Storms, Murl W., State Director, Oregon State Office, Bureau of Land Management, Portland, Oreg 2620 65 Thorne, Raymond P., Board of County Commissioners, County Commissioners Chambers, Klamath County Courthouse Annex, Klamath Falls, Oreg 2620 2 White, Hon. Dale, County Judge for Harney County, Burns, Oreg- 2620 134 Williams, Gary, representing the Oregon Wool Growers Association._ 21 Zinn, Thomas G., Wasco County Extension Agent, Oregon State Uni versity Extension Service 2620 48 (in) IV APPENDIX Statement of Edward Peile, president, Jackson County Stockmen's As- sociation 2620 201 Statement of Mike Hanley, Jordan Valley, Oreg 2620 201 Statement of Gene Officer, president, Grant County Stockgrowers Asso ciation, Canyon City, Oreg 2620 204 HEARING DATES August 16, 1977: Afternoon session 2620 1 August 17,1977: Afternoon session 2620 133 Close