| 出版: | Washington : U.S. Dept. of the Interior, Fish and Wildlife Service |
| 附註: | Bibliography: p. 7-8 Samples of crustacean zooplankton were collected monthly in west-central Lake Erie in April and June to October 1968, and in July and August 1970, before and during periods of hypolimnetic dissolved oxygen (DO) depletion. The water column at offshore stations was thermally stratified from June through September 1968, and the hypolimnion contained no DO in mid-August of 1968 or 1970. Composition, abundance, and vertical distribution of crustacean zooplankton changed coincidently with oxygen depletion. Zooplankton composition shifted from mainly cyclopoid copepods in July to mainly cladocerans and copepod nauplii in middle to late August. We believe that mortality of adults and dormancy of copepodites in response to anoxia was the probable reason for the late summer decline of planktonic C. b. thomasi. |
| 出版: | Alexandria, Va. : U.S. Dept. of Defense, Defense Logistics Agency |
| 附註: | Prepared by Defense Logistics Agency. For further information contact : Public Affairs Office, Cameron Station, Alexandria, Va. 22314 |
| 附註: | F available only in microfiche. |
| 附註: | D available only in microfiche. |
| 出版: | Washington : Environmental Protection Agency, Office of Water Planning and Standards |
| 附註: | Includes summaries of papers presented during a symposium held at Pensacola, Fla., from February 11 to 13, 1975 Includes bibliographies. |
| 出版: | Fort Belvoir, Virginia : Springfield, Virginia : U.S. Army Coastal Engineering Research Center ; National Technical Information Service, Operations Division |
| 附註: | "February 1977." Contract no. DACW72-71-C-0003 Cover title. Includes bibliographical references (pages 54-58). APPROVED FOR PUBLIC RELEASE. The objective of this study was to determine the effects, if any, of sublethal concentrations of suspended materials on the fish in estuarine systems. Experimental sediment suspensions reproduced the concentrations frequently found during flooding and at dredging sites and dredged-material disposal sites. The suspensions were of natural sediment, obtained from the Patuxent River estuary, Maryland, or commercially available Fuller's earth. Fish were collected in the Patuxent River estuary and transported to the laboratory. The selected fish species inhabited ecologically different sections of the estuary; therefore, the overall reactions of each species were unique. Seven species of estuarine fish were exposed to Fuller's earth and natural sediment suspensions for timed periods and hematological changes were noted. The effects of various concentrations of Fuller's earth suspensions on white perch gill tissue were determined. Oxygen consumption rates of striped bass, white perch, and toadfish were measured in filtered Patuxent River water and compared to consumption rates in filtered river water suspensions of Fuller's earth or Patuxent River sediment. Fish showed signs of stress in response to suspended sediments in most of the experiments. Results indicate that sublethal concentrations of suspended solids can affect estuarine fish. |
| 附註: | DOT-OS-50239 Transportation Department, Office of University Research, Washington, D.C. Author corporate affiliation: Massachusetts Institute of Technology, Center for Transportation and Logistics, Cambridge Subject code: SDBL Subject code: WNBP Subject code: YCJS |
| 出版: | Washington : U.S. General Accounting Office |
| 附註: | "LCD-76-450." Publication date stamped on cover. Cover title. |
| 出版: | Amherst, Mass. : Environmental Institute, University of Massachusetts |
| 附註: | NPS D-39 "Contract Number DI-NPS-CX-1600-5-0001A." Includes bibliographical references (p. 6). |
| 出版: | Fort Belvoir, Virginia : U.S. Army, Corps of Engineers, Coastal Engineering Research Center |
| 附註: | Issued April 1977 Cover title. Includes bibliographical references (pages 89-90). |
| 出版: | Washington, D.C. : U.S. Dept. of Interior, Fish and Wildlife Service |
| 附註: | Bibliography: p. 13-16 |
| 附註: | F available only in microfiche. |
| 附註: | F,Fsup,Fsup2 available only in microfiche. |
| 出版: | Washington : Dept. of Transportation, Coast Guard |
| 出版: | Ada, Okla. : Springfield, Va. : Robert S. Kerr Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; For sale by the National Technical Information Service |