scholarly journals Changes in bottom-surface elevations in three reservoirs on the lower Susquehanna River, Pennsylvania and Maryland, following the January 1996 flood; implications for nutrient and sediment loads to Chesapeake Bay

1997 ◽  
Keyword(s):  
Chesapeake Bay ◽  
Bottom Surface ◽  
Susquehanna River ◽  
Sediment Loads

Suspended Sediment Discharge of the Susquehanna River to Northern Chesapeake Bay, 1966 to 1976

Estuaries ◽  
1978 ◽  
Vol 1 (2) ◽  
pp. 106 ◽  
Author(s):  
M. Grant Gross ◽  
M. Karweit ◽  
William B. Cronin ◽  
J. R. Schubel
Keyword(s):  
Chesapeake Bay ◽  
Suspended Sediment ◽  
Sediment Discharge ◽  
Susquehanna River

scholarly journals Predictability of Vibrio cholerae in Chesapeake Bay

2003 ◽  
Vol 69 (5) ◽  
pp. 2773-2785 ◽  
Author(s):  
Valérie R. Louis ◽  
Estelle Russek-Cohen ◽  
Nipa Choopun ◽  
Irma N. G. Rivera ◽  
Brian Gangle ◽  
...  
Keyword(s):  
Chesapeake Bay ◽  
Vibrio Cholerae ◽  
Stream Flow ◽  
Natural Waters ◽  
Global Climate ◽  
Fluorescent Antibody ◽  
Fourfold Increase ◽  
Susquehanna River ◽  
Direct Fluorescent Antibody ◽  
Untreated Water

ABSTRACT Vibrio cholerae is autochthonous to natural waters and can pose a health risk when it is consumed via untreated water or contaminated shellfish. The correlation between the occurrence of V. cholerae in Chesapeake Bay and environmental factors was investigated over a 3-year period. Water and plankton samples were collected monthly from five shore sampling sites in northern Chesapeake Bay (January 1998 to February 2000) and from research cruise stations on a north-south transect (summers of 1999 and 2000). Enrichment was used to detect culturable V. cholerae, and 21.1% (n = 427) of the samples were positive. As determined by serology tests, the isolates, did not belong to serogroup O1 or O139 associated with cholera epidemics. A direct fluorescent-antibody assay was used to detect V. cholerae O1, and 23.8% (n = 412) of the samples were positive. V. cholerae was more frequently detected during the warmer months and in northern Chesapeake Bay, where the salinity is lower. Statistical models successfully predicted the presence of V. cholerae as a function of water temperature and salinity. Temperatures above 19°C and salinities between 2 and 14 ppt yielded at least a fourfold increase in the number of detectable V. cholerae. The results suggest that salinity variation in Chesapeake Bay or other parameters associated with Susquehanna River inflow contribute to the variability in the occurrence of V. cholerae and that salinity is a useful indicator. Under scenarios of global climate change, increased climate variability, accompanied by higher stream flow rates and warmer temperatures, could favor conditions that increase the occurrence of V. cholerae in Chesapeake Bay.

Herbicide and Insecticide Loadings from the Susquehanna River to the Northern Chesapeake Bay

2002 ◽  
Vol 50 (15) ◽  
pp. 4385-4392 ◽  
Author(s):  
Bo Liu ◽  
Laura L. McConnell ◽  
Alba Torrents
Keyword(s):  
Chesapeake Bay ◽  
Susquehanna River

Particle-borne radionuclides as tracers for sediment in the Susquehanna River and Chesapeake Bay

1989 ◽  
Vol 29 (4) ◽  
pp. 341-360 ◽  
Author(s):  
Joseph F. Donoghue ◽  
Owen P. Bricker ◽  
Curtis R. Olsen
Keyword(s):  
Chesapeake Bay ◽  
Susquehanna River

Surface Analysis of Chesapeake Bay Water Quality Response to Different Nutrient and Sediment Loads

2006 ◽  
Vol 132 (3) ◽  
pp. 377-383 ◽  
Author(s):  
Ping Wang ◽  
Lewis C. Linker ◽  
Richard Batiuk ◽  
Carl Cerco
Keyword(s):  
Water Quality ◽  
Chesapeake Bay ◽  
Surface Analysis ◽  
Sediment Loads ◽  
Quality Response

Particulate Carbon:Nitrogen Relations in Northern Chesapeake Bay

1971 ◽  
Vol 28 (6) ◽  
pp. 911-918 ◽  
Author(s):  
David A. Flemer ◽  
Robert B. Biggs
Keyword(s):  
Chesapeake Bay ◽  
Net Primary Production ◽  
C:N Ratio ◽  
Particulate Material ◽  
Late Winter ◽  
Suspended Material ◽  
Particulate Carbon ◽  
Susquehanna River ◽  
Low Salinity ◽  
Thaw Period

The Susquehanna River annually supplies about 8.4 × 104 and 4.7 × 103 metric tons of particulate carbon (PC) and nitrogen (PN), respectively, to upper Chesapeake Bay. In the upper bay, the concentration of PN usually ranges between 0.10 and 0.30 mg liter−1 and is occasionally greater than 0.50 mg liter−1. In the lower study area, the concentration of PN stabilizes near 0.10 mg liter−1. Maximum values of the carbon:nitrogen (C:N) ratio (atomic basis) occurred in the upper bay, and highest values were associated with the late-winter thaw period of the Susquehanna River. C:N ratios of 20–30 were usual most of the year in the low salinity region, and often greater than 30 during times of maximum river discharge. In the lower study area, the ratio approached 15 throughout most of the year. In general, the reduction in the C:N ratios of the suspended material was reflected in the C:N ratios of the sediments.The high C:N ratios in the upper bay and the tidal freshwater portion of the Susquehanna River indicate a high detrital content. An estimate of net primary production would extrapolate to the fixation of PN of approximately 1600 metric tons per year in the upper bay or about 34% of that supplied by upland drainage. The major source of PN in the lower study area is probably provided by photosynthetic fixation, since the physical circulation of the estuary retards a large movement of particulate material seaward.

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