The concentration of industrial, residential and agricultural activity on the lowlands surrounding our estuaries has led to an increasing problem of flood risk in these areas. However, flood hazards have been, in large part, the result of past human interference in the estuary system and as such may be reduced by more enlightened management. This paper examines the problems of flood risk and di...

The emf measurements for the TRIS buffer in seawater have been used to define buffer solutions that can be used to determine the pH on a free or total proton scale for estuarine waters. The pH is related to the stoichiometric dissociation constant (K*) of TRISH I-, the concentration of buffer (mTRrs) and salinity (5) by pH = pK* + (aS + bS2)mTRrs where a = -9.73 x 10e5 and b = 6.988 x 10-5. The...

Title of Dissertation: CRYPTIC DIVERSITY, ECOLOGICAL DIFFERENTIATION AND POPULATION GENETICS OF AN ESTUARINE COPEPOD, ACARTIA TONSA DANA 1849 (COPEPODA: CALANOIDA) Gang Chen, Doctor of Philosophy, 2009 Dissertation directed by: Dr. Matthew P. Hare Assistant Professor, Department of Biology, University of Maryland, College Park Associate Professor, Department of Natural Resources, Cornell Univer...

Atmospheric deposition of nitrogen (AD-N) is a significant source of nitrogen enrichment to nitrogen (N)limited estuarine and coastal waters downwind of anthropogenic emissions. Along the eastern U.S. coast and eastern Gulf of Mexico, AD-N currently accounts for 10% to over 40% of new N loading to estuaries. Extension of the regional acid deposition model (RADM) to coastal shelf waters indicate...

a r t i c l e i n f o The increasing fragmentation and degradation tendency of estuarine wetlands due to rapid urbanization in coastal areas exert the urgent need to quantify the structural characteristic of wetland network, which involves the fragmentized wetland patches for wetland restoration and conservation. Although wetland networks have already been used for conservation planning on a re...

Mobilization of arsenic from freshwater and estuarine sediments during the transition from oxic to anoxic conditions was investigated using recently developed diffusive sampling techniques. Arsenic speciation and Fe(II) concentrations were measured at high resolution (1-3 mm) with in situ diffusive gradients in thin films (DGT) and diffusive equilibration in thin films (DET) techniques. Water c...

An index (EQUATION* Estuarine QUAlity and condiTION) is presented for integrated evaluation of estuarine quality, based on an aggregation of four di!erent components: vulnerability, measuring the physical capacity of the system to react to change, water quality, which examines trophic status and eutrophication aspects, sediment quality, which looks at the sediments and benthic fauna, and tropho...

We measured mercury (Hg) isotope ratios in sediments and various estuarine organisms (green crab, blue mussel, killifish, eider) to investigate methylmercury (MMHg) sources and exposure pathways in five Northeast coast (U.S.) estuaries. The mass independent Hg isotopic compositions (MIF; Δ(199)Hg) of the sediments were linearly correlated with the sediment 1/Hg concentrations (Δ(199)Hg: r(2) = ...

A coupled biological–physical box model is developed to investigate the seasonal and interannual variability of marine plankton in strongly estuarine systems such as the semi-enclosed estuary of the Strait of Georgia and Juan de Fuca Strait on the west coast of Canada. The estuarine circulation not only supplies nutrients to the euphotic layer but also transports plankton between the straits, c...

Survival of Escherichia coli and Salmonella spp. in estuarine waters was compared over a variety of seasonal temperatures during in situ exposure in diffusion chambers. Sublethal stress was measured by both selective-versus-resuscitative enumeration procedures and an electrochemical detection method. E. coli and Salmonella spp. test suspensions, prepared to minimize sublethal injury, were expos...