Trapping of Suspended Sediment by Submerged Aquatic Vegetation in a Tidal Freshwater Region: Field Observations and Long-Term Trends

2020 ◽  
Author(s):  
Paul A. Work ◽  
Maureen Downing-Kunz ◽  
Judith Z. Drexler
Keyword(s):  
Suspended Sediment ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Tidal Freshwater ◽  
Field Observations ◽  
Long Term Trends

Long-term phosphorus removal in Florida aquatic systems dominated by submerged aquatic vegetation

2003 ◽  
Vol 20 (1) ◽  
pp. 45-63 ◽  
Author(s):  
Robert L. Knight ◽  
Binhe Gu ◽  
Ronald A. Clarke ◽  
Jana M. Newman
Keyword(s):  
Phosphorus Removal ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Aquatic Systems

Multi-Scale Controls on Water Quality Effects of Submerged Aquatic Vegetation in the Tidal Freshwater Hudson River

Ecosystems ◽  
2006 ◽  
Vol 9 (1) ◽  
pp. 84-96 ◽  
Author(s):  
Stuart E. G. Findlay ◽  
William C. Nieder ◽  
Elizabeth A. Blair ◽  
David T. Fischer
Keyword(s):  
Water Quality ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Hudson River ◽  
Tidal Freshwater ◽  
Multi Scale

A Geospatial Approach for Estimating Suitable Habitat and Population Size of the Invasive Northern Snakehead

2015 ◽  
Vol 6 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Joseph W. Love ◽  
Joshua J. Newhard ◽  
Brett Greenfield
Keyword(s):  
Chesapeake Bay ◽  
Population Size ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Adult Population ◽  
Tidal Freshwater ◽  
Predatory Fish ◽  
Suitable Habitat ◽  
Potomac River ◽  
Chesapeake Bay Watershed

Abstract Northern snakehead Channa argus, an invasive predatory fish species from Asia, may continue to establish itself throughout temperate areas of the eastern United States, particularly in shallow vegetated habitats of ponds and streams. The species was first collected in the Potomac River in 2004 and has become successfully established in several major rivers within the Chesapeake Bay watershed. The objectives of this work were to develop habitat suitability criteria using a novel methodology that combines geographic information systems technology and fish surveys to estimate population sizes. A combination of catch data and reported or empirically derived habitat relationships were used to analyze seasonal distributions (March–October) in two tidal freshwater tributaries of the Potomac River: Nanjemoy Creek (2013) and Chopawamsic Creek (2010–2013). Adults were collected in relatively deeper sections of the streams (average depth 0.7–1.0 m) with a low cover of submerged aquatic vegetation (0–21% of site). Using additional distributional data, we identified suitability criteria as: 1) edges of submerged aquatic vegetation that included 5 m of vegetation and 5 m of adjacent open water; 2) less than 30% of mid-channel distance from shore, which may or may not include submerged aquatic vegetation; and 3) the upper 15% of the tidal freshwater stream. An adult population estimate derived from a suitable area in Pomonkey Creek (a tributary of the Potomac River) and estimated densities from Nanjemoy Creek and Chopawamsic Creek (i.e., three adults/ha) was not different from that expected using electrofishing surveys. Assuming approximately 7,093 ha of suitable habitat and three adults/ha, the number of adults was predicted to be 21,279 for 44 major tidal freshwater tributaries of the Potomac River. This is our first estimate of population size of northern snakehead for any river of the Chesapeake Bay watershed and its accuracy will undoubtedly improve as additional studies report variation in density for other tributaries. Because of the species’ ability to establish itself in temperate climates, it is important to engage the public to prevent additional releases of northern snakehead, especially to vulnerable habitats.

The Role of Habitat and Herbivory on the Restoration of Tidal Freshwater Submerged Aquatic Vegetation Populations

2008 ◽  
Vol 18 (4) ◽  
pp. 596-604 ◽  
Author(s):  
Kenneth A. Moore ◽  
Erin C. Shields ◽  
Jessie C. Jarvis
Keyword(s):  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Tidal Freshwater

Magnitude and Patterns of Change in Submerged Aquatic Vegetation of the Tidal Freshwater Hudson River

2014 ◽  
Vol 37 (5) ◽  
pp. 1233-1242 ◽  
Author(s):  
S. E. G. Findlay ◽  
D. L. Strayer ◽  
S. D. Smith ◽  
N. Curri
Keyword(s):  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Hudson River ◽  
Tidal Freshwater

scholarly journals Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary

2019 ◽  
Author(s):  
Neil K. Ganju ◽  
Jeremy M. Testa ◽  
Steven E. Suttles ◽  
Alfredo L. Aretxabaleta
Keyword(s):  
Dissolved Oxygen ◽  
Primary Production ◽  
Chlorophyll A ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Light Attenuation ◽  
Sediment Resuspension ◽  
Ecosystem Metabolism ◽  
Net Ecosystem Metabolism

Abstract. Quantifying system-wide biogeochemical dynamics and ecosystem metabolism in estuaries is often attempted using a long-term continuous record at a single site, or short-term records at multiple sites due to sampling limitations that preclude long-term monitoring at multiple sites. However, differences in the dominant primary producer at a given location (e.g., phytoplankton versus submerged aquatic vegetation; SAV) control diel variations in dissolved oxygen and associated ecosystem metabolism, and may confound metabolism estimates that do not account for this variability. We hypothesize that even in shallow, well-mixed estuaries there are strong spatiotemporal gradients in ecosystem metabolism due to the influence of submerged aquatic vegetation (SAV), and ensuing feedbacks to sediment resuspension, light attenuation, and primary production. We tested this hypothesis by measuring hydrodynamic properties, biogeochemical variables (fluorescent dissolved organic matter (fDOM), turbidity, chlorophyll-a fluorescence, dissolved oxygen), and photosynthetically active radiation (PAR) over one year at 15 min intervals at paired channel (unvegetated) and shoal (vegetated) sites in Chincoteague Bay, Maryland/Virginia, USA, a shallow back-barrier estuary. Light attenuation (KdPAR) at all sites was dominated by turbidity from suspended sediment, with lower contributions from fDOM and chlorophyll-a. However, there was significant seasonal variability in the resuspension-shear stress relationship on the vegetated shoals, but not in adjacent unvegetated channels. This indicated that KdPAR on the shoals was mediated by SAV presence in the summer, which reduced resuspension and therefore KdPAR. We also found that gross primary production (Pg) and KdPAR were significantly negatively correlated on the shoals and uncorrelated in the channels, indicating that Pg over the vegetated shoals is controlled by a feedback loop between SAV presence, sediment resuspension, and light availability. Metabolic estimates indicated substantial differences in net ecosystem metabolism between vegetated and unvegetated sites, with the former tending towards net autotrophy in the summer. Ongoing trends of SAV loss in this and other back-barrier estuaries suggests that these systems may also shift towards net heterotrophy, reducing their effectiveness as long-term carbon sinks. With regard to temporal variability, we found that varying sampling frequency between 15 min and 1 d resulted in comparable mean values of biogeochemical variables, but extreme values were missed by daily sampling. In fact, daily re-sampling minimized the variability between sites and falsely suggested spatial homogeneity in biogeochemistry, emphasizing the need for high-frequency sampling. This study confirms that properly quantifying ecosystem metabolism and associated biogeochemical variability requires characterization of the diverse estuarine environments, even in well-mixed systems, and demonstrates the deficiencies introduced by infrequent sampling on the interpretation of spatial gradients.

scholarly journals INVESTIGATING THE EFFECTS OF RIVER DISCHARGES ON SUBMERGED AQUATIC VEGETATION USING UAV IMAGES AND GIS TECHNIQUES

2020 ◽  
Vol V-5-2020 ◽  
pp. 93-99 ◽  
Author(s):  
A. Tamondong ◽  
T. Nakamura ◽  
Y. Kobayashi ◽  
M. Garcia ◽  
K. Nadaoka
Keyword(s):  
Water Quality ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Field Survey ◽  
Survey Methods ◽  
River Mouth ◽  
Water Clarity ◽  
Ease Of Use ◽  
Percent Cover ◽  
Field Observations

Abstract. One of the major factors controlling the distribution and abundance of marine submerged aquatic vegetation (SAV) is light availability. Reduced water clarity due to sediment loading from rivers greatly affects the health and coverage of seagrasses and seaweeds. Monitoring SAV using unmanned aerial vehicles (UAV) has been getting attention because of its cost-effectiveness and ease of use. In this research, a low-cost UAV was utilized to assess the impacts of river discharges on SAV in Busuanga Island, Philippines. Linear regression was performed to determine the effectivity and accuracy of UAV-based percent cover estimation compared to established field survey methods of monitoring SAV. Water quality was estimated in the study area by performing spatial interpolation methods of in situ measurement of turbidity, chlorophyll, temperature, salinity, and dissolved oxygen using a multi-parameter water quality sensor. Current velocity and tidal fluctuations were monitored using bottom-mounted sensors deployed near the river mouth and in seagrass and seaweed areas with relatively good water clarities. Four stations were surveyed using automated UAV missions which were flown simultaneously with field observations. Each station surveyed has varying distances from the river mouth. Results from the classification of the UAV data and field survey show that SAV is more abundant as the distance from the river mouth increases and the turbidity decreases. Classification overall accuracies of UAV orthophotos ranging from 87.91–93.41% were achieved using Maximum Likelihood (ML) Classification. Comparison of field-based and UAV-based survey of percent cover of seagrasses show an overestimation of 1.75 times from the UAV compared to field observations.

Long-Term Trends in Submersed Aquatic Vegetation (SAV) in Chesapeake Bay, USA, Related to Water Quality

2010 ◽  
Vol 33 (5) ◽  
pp. 1144-1163 ◽  
Author(s):  
Robert J. Orth ◽  
Michael R. Williams ◽  
Scott R. Marion ◽  
David J. Wilcox ◽  
Tim J. B. Carruthers ◽  
...  
Keyword(s):  
Water Quality ◽  
Chesapeake Bay ◽  
Aquatic Vegetation ◽  
Submersed Aquatic Vegetation ◽  
Long Term Trends
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