The Effect of Freshwater Inflow on Meiofaunal and Macrofaunal Populations in the Guadalupe and Nueces Estuaries, Texas

Estuaries ◽  
1992 ◽  
Vol 15 (3) ◽  
pp. 307 ◽  
Author(s):  
Paul A. Montagna ◽  
Richard D. Kalke
Keyword(s):  
Freshwater Inflow

Carbon-Isotope, Diatom, and Pollen Evidence for Late Holocene Salinity Change in a Brackish Marsh in the San Francisco Estuary

2001 ◽  
Vol 55 (1) ◽  
pp. 66-76 ◽  
Author(s):  
Roger Byrne ◽  
B. Lynn Ingram ◽  
Scott Starratt ◽  
Frances Malamud-Roam ◽  
Joshua N. Collins ◽  
...  
Keyword(s):  
San Francisco ◽  
High Salinity ◽  
Carbon Isotopic Composition ◽  
Brackish Marsh ◽  
San Francisco Estuary ◽  
Freshwater Inflow ◽  
Water Diversion ◽  
Freshwater Flow ◽  
Low Salinity ◽  
Carbon Isotopic

AbstractAnalysis of diatoms, pollen, and the carbon-isotopic composition of a sediment core from a brackish marsh in the northern part of the San Francisco Estuary has provided a paleosalinity record that covers the past 3000 yr. Changes in marsh composition and diatom frequencies are assumed to represent variations in freshwater inflow to the estuary. Three periods of relatively high salinity (low freshwater inflow) are indicated, 3000 to 2500 cal yr B.P., 1700 to 730 cal yr B.P., and ca. A.D. 1930 to the present. The most recent period of high salinity is primarily due to upstream storage and water diversion within the Sacramento–San Joaquin watershed, although drought may also have been a factor. The two earlier high-salinity periods are likely the result of reduced precipitation. Low salinity (high freshwater flow) is indicated for the period 750 cal yr B.P. to A.D. 1930.

scholarly journals How a Simple Question About Freshwater Inflow to Estuaries Shaped a Career

2021 ◽  
Vol 32 ◽  
pp. ii-xiv
Author(s):  
Paul Montagna
Keyword(s):  
Climatic Factors ◽  
Structure And Function ◽  
Freshwater Inflow ◽  
Ecosystem Change ◽  
Good Luck ◽  
Habitat Conditions ◽  
Simple Question ◽  
Mexico Border ◽  
Estuarine Systems ◽  
And Function

Chance and good luck led to a career studying how freshwater inflow drives estuary processes. In 1986, someone asked me: How much fresh water has to flow to a bay for it to be healthy? The question shaped my career. There is probably no better place on Earth to compare effects caused by inflow differences than the Texas coast, because the major estuarine systems lie in a climatic gradient where runoff decreases 56—fold from the Louisiana border in the northeast to the Mexico border in the southwest. This estuary—comparison experiment was used to study inflow effects. The science evolved from the idea in the 1990’s that organisms responded directly to inflow rates to the domino theory in the 2000’s of indirect effects where inflow drives estuary conditions and that organisms respond to those habitat conditions. Today it is hypothesized that climate drives hydrology, which drives estuary dynamics; and thus, climatic factors can indirectly shape estuarine structure and function. Assuming change along the inflow gradient is analogous to effects of altering estuaries over time, we can now predict ecosystem change with changing climate or land—use change.

Growth of largemouth bass in a dynamic estuarine environment: an evaluation of the relative effects of salinity, diet, and temperature

2013 ◽  
Vol 70 (3) ◽  
pp. 485-501 ◽  
Author(s):  
David C. Glover ◽  
Dennis R. DeVries ◽  
Russell A. Wright
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Cost Benefit ◽  
Metabolic Cost ◽  
Growth Patterns ◽  
Freshwater Inflow ◽  
Estuarine Environment ◽  
Spatial And Seasonal Variation ◽  
Maximum Water Temperature ◽  
Incremental Growth

Some freshwater fishes occur regularly in estuarine areas that experience spatial and seasonal variation in marine influence. These dynamic abiotic and biotic conditions potentially influence food consumption and growth. We found that effects of an estuarine environment on the growth of largemouth bass (Micropterus salmoides) in Alabama's Mobile–Tensaw River Delta depended on body size, distance from the marine source, and amount of freshwater inflow. Incremental growth analyses demonstrated that young largemouth bass (<age-3) grew more rapidly downstream in the estuarine environment declining with distance upstream; this relationship was reversed for older fish with faster growth in fresher, upstream areas. The magnitude of freshwater inflow influenced the relationship between age-specific growth and proximity to Mobile Bay. Bioenergetics simulations suggest that interactions among size-specific metabolic cost of salinity, maximum water temperature, and spatial differences in both salinity and prey energetic content can explain these growth patterns. The cost–benefit of the estuarine environment to largemouth bass is not only dynamic seasonally, but also changes ontogenetically because of shifts in salinity tolerance and prey use.

NUMERICAL MODELING OF CO2 DYNAMICS IN SEAWATER CONSIDERING EFFECTS OF FRESHWATER INFLOW IN THE YATSUSHIRO SEA

2021 ◽  
Vol 77 (2) ◽  
pp. I_847-I_852
Author(s):  
Hiroto KOMORI ◽  
Bing XIONG ◽  
Naoki SAITO ◽  
Lin HAO ◽  
Baixin CHI ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Freshwater Inflow ◽  
Yatsushiro Sea

Assessment of Freshwater Inflow and Water Quality for an Urbanized, Subtropical Estuary (Lake Worth Lagoon, Florida, USA)

2018 ◽  
Vol 52 (4) ◽  
pp. 19-31
Author(s):  
Christopher Buzzelli ◽  
Zhiqiang Chen ◽  
Peter Doering ◽  
Amanda Kahn
Keyword(s):  
Water Quality ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Suspended Solids ◽  
Environmental Parameters ◽  
Total Suspended Solids ◽  
South Florida ◽  
Freshwater Inflow ◽  
Spatial And Temporal Variability ◽  
Palm Beach County

Abstract Coastal water bodies are impacted by watershed alterations, increased population density, modifications to inlets and shorelines, climatic periodicity, and increases in external material loads. Estuaries such as Lake Worth Lagoon (LWL) in south Florida possess all these attributes. The LWL watershed extends from the southeastern portion of Lake Okeechobee through Palm Beach County, where it meets the lagoon. Palm Beach County Department of Environmental Resources Management recognizes the social and ecological importance of the ~36 km lagoon and aims to maintain suitable water and habitat quality for all stakeholders. Recent declines and shifts of seagrass distribution along the lagoon prompted a step toward better understanding the water quality patterns of the system. In support of these efforts, this study assessed bathymetry, inflow, flushing, and water quality attributes (chlorophyll a, salinity, total nitrogen, total phosphorus, total suspended solids, turbidity) using data collected along a series of 14 midlagoon stations from 2007 to 2015. Salinity in the North Segment was higher and less variable because of proximity to Palm Beach Inlet. Although concentrations of chlorophyll a, total nitrogen, and total phosphorus correlated with freshwater inflow, turbidity and total suspended solids were not. Fast flushing of the lagoon on a scale of days likely precludes water quality issues common to many estuaries with higher resident times. However, the combination of landscape-scale water management, a shoreline that is almost 70% modified by hard structures, and changes in essential nearshore habitats, introduces new levels of uncertainty to both the understanding and management of LWL. From this study, increased knowledge of relationships among water quality parameters and their spatial and temporal variability in LWL provides points of reference from which targeted studies can be developed to explore links between environmental parameters and responses of key organisms in this unique system.

scholarly journals Climate Change Impact Assessment on Freshwater Inflow into the Small Aral Sea

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2377 ◽  
Author(s):  
Georgy Ayzel ◽  
Alexander Izhitskiy
Keyword(s):  
Climate Change ◽  
Impact Assessment ◽  
Hybrid Model ◽  
Climate Change Impact ◽  
General Circulation ◽  
Freshwater Inflow ◽  
Aral Sea ◽  
Climate Change Impact Assessment ◽  
Ecological Conditions ◽  
Change Impact

During the last few decades, the rapid separation of the Small Aral Sea from the isolated basin has changed its hydrological and ecological conditions tremendously. In the present study, we developed and validated the hybrid model for the Syr Darya River basin based on a combination of state-of-the-art hydrological and machine learning models. Climate change impact on freshwater inflow into the Small Aral Sea for the projection period 2007–2099 has been quantified based on the developed hybrid model and bias corrected and downscaled meteorological projections simulated by four General Circulation Models (GCM) for each of three Representative Concentration Pathway scenarios (RCP). The developed hybrid model reliably simulates freshwater inflow for the historical period with a Nash–Sutcliffe efficiency of 0.72 and a Kling–Gupta efficiency of 0.77. Results of the climate change impact assessment showed that the freshwater inflow projections produced by different GCMs are misleading by providing contradictory results for the projection period. However, we identified that the relative runoff changes are expected to be more pronounced in the case of more aggressive RCP scenarios. The simulated projections of freshwater inflow provide a basis for further assessment of climate change impacts on hydrological and ecological conditions of the Small Aral Sea in the 21st Century.

Heterotrophic Bacterioplankton of the Laptev and East Siberian Sea Shelf Affected by Freshwater Inflow Areas

Oceanology ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 62-73
Author(s):  
E. M. Bezzubova ◽  
A. M. Seliverstova ◽  
I. A. Zamyatin ◽  
N. D. Romanova
Keyword(s):  
Freshwater Inflow ◽  
Heterotrophic Bacterioplankton ◽  
East Siberian Sea
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