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Articles 451 - 454 of 454
Full-Text Articles in Physical Sciences and Mathematics
2001 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2001 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2001.
Remote Sensing Of Biotic Effects: Zebra Mussels (Dreissena Polymorpha) Influence On Water Clarity In Saginaw Bay, Lake Huron, Judith W. Budd, Thomas D. Drummer, Thomas F. Nalepa, Gary L. Fahnenstiel
Remote Sensing Of Biotic Effects: Zebra Mussels (Dreissena Polymorpha) Influence On Water Clarity In Saginaw Bay, Lake Huron, Judith W. Budd, Thomas D. Drummer, Thomas F. Nalepa, Gary L. Fahnenstiel
United States Department of Commerce: Staff Publications
In this study, Advanced Very High Resolution Radiometer (AVHRR) remote sensing reflectance (Rrs), imagery from 1987–1993 is used to study changes in water clarity before and after zebra mussels (Dreissena polymorpha) were discovered in Saginaw Bay, Lake Huron. Spatial and temporal trends in the data indicate distinct and persistent increases in water clarity in the inner bay after the first large recruitment of zebra mussels in the fall of 1991. The pre-Dreissena imagery show that turbidity in the inner bay was influenced by the Saginaw River discharge in spring, biological production (plankton) in summer, and …
Changes In Diet And Body Condition Of Lake Whitefish In Southern Lake Michigan Associated With Changes In Benthos, Steven A. Pothoven, Thomas F. Nalepa, Philip J. Schneeberger, Stephen B. Brandt
Changes In Diet And Body Condition Of Lake Whitefish In Southern Lake Michigan Associated With Changes In Benthos, Steven A. Pothoven, Thomas F. Nalepa, Philip J. Schneeberger, Stephen B. Brandt
United States Department of Commerce: Staff Publications
We evaluated the long-term trends of the benthic macroinvertebrate community (1980–1999) and biological attributes of lake whitefish Coregonus clupeaformis (1985–1999) in southeastern Lake Michigan. We also determined what food types were important to lake whitefish in an area where the amphipod Diporeia had not yet declined in 1998 and how the diet of lake whitefish changed as Diporeia declined during 1999–2000. Zebra mussels Dreissena polymorpha invaded the study area in 1992; Diporeia began to decline in 1993 and was nearly absent by 1999. The body condition of lake whitefish decreased after 1993 and remained low thereafter. The length at age …
Zebra Mussel (Dreissena Polymorpha) Selective Filtration Promoted Toxic Microcystis Blooms In Saginaw Bay (Lake Huron) And Lake Erie, Henry A. Vanderploeg, James R. Liebig, Wayne W. Carmichael, Megan A. Agy, Thomas H. Johengen, Gary L. Fahnenstiel, Thomas F. Nalepa
Zebra Mussel (Dreissena Polymorpha) Selective Filtration Promoted Toxic Microcystis Blooms In Saginaw Bay (Lake Huron) And Lake Erie, Henry A. Vanderploeg, James R. Liebig, Wayne W. Carmichael, Megan A. Agy, Thomas H. Johengen, Gary L. Fahnenstiel, Thomas F. Nalepa
United States Department of Commerce: Staff Publications
Microcystis aeruginosa, a planktonic colonial cyanobacterium, was not abundant in the 2-year period before zebra mussel (Dreissena polymorpha) establishment in Saginaw Bay (Lake Huron) but became abundant in three of five summers subsequent of mussel establishment. Using novel methods, we determined clearance, capture, and assimilation rates for zebra mussels feeding on natural and laboratory M. aeruginosa strains offered alone or in combination with other algae. Results were consistent with the hypothesis that zebra mussels promoted blooms of toxic M. aeruginosa in Saginaw Bay, western Lake Erie, and other lakes through selective rejection in pseudofeces. Mussels exhibited high …