Network analysis of the North Inlet: Salt marsh ecosystem

Author(s):  
Milton L. Asmus ◽  
Henry N. McKellar
1982 ◽  
Vol 8 (2) ◽  
pp. 139-156 ◽  
Author(s):  
Thomas H. Chrzanowski ◽  
L. Harold Stevenson ◽  
John D. Spurrier

1977 ◽  
Vol 30 (1-4) ◽  
pp. 343-356 ◽  
Author(s):  
R. Dame ◽  
F. Vernberg ◽  
R. Bonnell ◽  
W. Kitchens

2003 ◽  
Vol 69 (7) ◽  
pp. 4129-4143 ◽  
Author(s):  
Peter A. Noble ◽  
Raphael G. Tymowski ◽  
Madilyn Fletcher ◽  
James T. Morris ◽  
Alan J. Lewitus

ABSTRACT Phytoplankton community pigment composition and water quality were measured seasonally along salinity gradients in two minimally urbanized salt marsh estuaries in South Carolina in order to examine their spatial and temporal distributions. The North Inlet estuary has a relatively small watershed with minimal fresh water input, while the Ashepoo, Combahee, and Edisto (ACE) Basin is characterized by a relatively greater influence of riverine drainage. Sampling stations were located in regions of the estuaries experiencing frequent diurnal tidal mixing and had similar salinity and temperature regimens. Phytoplankton community pigment composition was assessed by using high-performance liquid chromatography (HPLC) and multivariate statistical analyses. Shannon diversity index, principal-component, and cluster analyses revealed that phytoplankton community pigments in both estuaries were seasonally variable, with similar diversities but different compositions. The temporal pigment patterns indicated that there was a relatively weak correlation between the pigments in ACE Basin and the relative persistence of photopigment groups in North Inlet. The differences were presumably a consequence of the unpredictability and relatively greater influence of river discharge in the ACE Basin, in contrast to the greater environmental predictability of the more tidally influenced North Inlet. Furthermore, the timing, magnitude, and pigment composition of the annual phytoplankton bloom were different in the two estuaries. The bloom properties in North Inlet reflected the predominance of autochthonous ecological control (e.g., regenerated nutrients, grazing), and those in ACE Basin suggested that there was greater influence of allochthonous environmental factors (e.g., nutrient loading, changes in turbidity). These interestuarine differences in phytoplankton community structure and control provide insight into the organization of phytoplankton in estuaries.


2014 ◽  
Vol 99 ◽  
pp. 1-16 ◽  
Author(s):  
Natasha L.M. Barlow ◽  
Antony J. Long ◽  
Margot H. Saher ◽  
W. Roland Gehrels ◽  
Mark H. Garnett ◽  
...  

1990 ◽  
Vol 27 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Richard F. Dame ◽  
Thomas G. Wolaver ◽  
Thomas M. Williams ◽  
John D. Spurrier ◽  
Anne B. Miller

2021 ◽  
Author(s):  
◽  
Desiree S A Craig

<p>The coastal communities of Tangimoana and Scott's Ferry have a long history of using shallow groundwater bores. The cumulative effect of pumping over decades could influence the saline interface given the close proximity of the communities to the seashore and river estuary. It is important to quantify the effects of pumping on both the shallow groundwater system and the dynamics of the saline interface. This is necessary to protect the groundwater system against saline intrusion especially given the increasing number of high volume groundwater consents to support dairying. Resistivity soundings and traverses, coupled with chemical analyses of groundwater samples, were found to be an effective method for defining the saline interface of the shallow groundwater aquifer under the Rangitikei delta. The saline interface extends from the salt marsh to beneath the farmland north of Tangimoana. The interface is a zone of diffusion with freshwater and brackish water mixing from the estuary. The interface is currently located on the outskirts of Tangimoana, and it is likely to extend beneath the township. The infiltration of brackish surface waters into sediments of the salt marsh form a surficial mixing zone that decreases with distance from the salt marsh. There is no indication of salinity in the area to the north of the Rangitikei delta. This area is most at risk of contamination from saline intrusion because of high volume groundwater abstractions, even though these abstractions are from deeper aquifers. The shallow groundwater beneath Tangimoana showed high concentrations of Ca and HCO3 ions. This may be a result of carbonate dissolution, which can occur when saline and freshwater mix. This creates groundwater that is under-saturated with calcium. The mixing water dissolves carbonates and increases the concentrations of Ca and HCO3. The major source of sodium and chloride was likely rainwater with evaporated solutes from seawater. The saline interface near Tangimoana appears to be relatively static, but the estuary and salt marsh are areas of low relief. There are preferential flows paths across the salt marsh to the farmland. These factors make the shallow groundwater in the Rangitikei delta vulnerable to saline intrusion.</p>


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