Differing temporal patterns of Chara hornemannii cover correlate to alternate regimes of phytoplankton and submerged aquatic-vegetation dominance

2012 ◽  
Vol 63 (11) ◽  
pp. 1005 ◽  
Author(s):  
Thomas A. Frankovich ◽  
Jordan G. Barr ◽  
Douglas Morrison ◽  
James W. Fourqurean
Keyword(s):  
Water Quality ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Seasonal Pattern ◽  
Quality Parameters ◽  
Environmental Stressors ◽  
Water Transparency ◽  
Environmental Drivers ◽  
Resource Managers ◽  
High Nutrient

Cover of the alga Chara hornemannii Wallman and water-quality parameters were measured over a 3-year period in adjacent mangrove subestuaries in Florida Bay, so as to describe temporal variability and infer relationships between Chara cover and water quality that will assist resource managers to restore Chara abundance to historically higher levels. A seasonal pattern of Chara cover was observed in the Alligator Creek subestuary that coincided with seasonal changes in water transparency in a relatively high-nutrient and phytoplankton environment. In contrast, higher Chara cover in the relatively low-nutrient and phytoplankton-abundance McCormick Creek subestuary did not exhibit a repeatable seasonal pattern, but was temporally negatively correlated with salinity and water depth. These observations suggest that water transparency may determine the importance of the salinity driver in these Chara communities. The present study demonstrates the differential importance of water quality and environmental drivers in estuaries distinguished by alternate regimes of phytoplankton and submerged aquatic-vegetation (SAV) dominance, and explains how differences in local estuarine geography may filter the response of SAV communities to environmental stressors.

Submerged aquatic vegetation in Cook's Bay, Lake Simcoe: Assessment of changes in response to increased water transparency

2011 ◽  
Vol 37 ◽  
pp. 72-82 ◽  
Author(s):  
David C. Depew ◽  
Adam J. Houben ◽  
Ted Ozersky ◽  
Robert E. Hecky ◽  
Stephanie J. Guildford
Keyword(s):  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Water Transparency ◽  
Lake Simcoe

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

scholarly journals Where's the Grass? Disappearing Submerged Aquatic Vegetation and Declining Water Quality in Lake Mattamuskeet

2017 ◽  
Vol 8 (2) ◽  
pp. 401-417 ◽  
Author(s):  
Michelle C. Moorman ◽  
Tom Augspurger ◽  
John D. Stanton ◽  
Adam Smith
Keyword(s):  
Water Quality ◽  
North Carolina ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Suspended Sediments ◽  
Water Clarity ◽  
Aquatic Life ◽  
Current Water

Abstract Major threats to aquatic systems such as shallow lakes can include declining water quality, the loss of macrophyte beds, and the occurrence of harmful algal blooms. Often, these changes go unnoticed until a shift from a clear, oligotrophic system dominated by macrophyte beds to a turbid, eutrophic system dominated by phytoplankton and associated harmful algal blooms has occurred. Lake Mattamuskeet, which mostly lies within the boundary of Mattamuskeet National Wildlife Refuge, North Carolina, is a shallow lake that has recently experienced a reduction in water clarity and macrophyte beds, also referred to as submerged aquatic vegetation (SAV), and an increase in nutrients, phytoplankton, harmful algal blooms, and cyanotoxin production. At Lake Mattamuskeet, SAV coverage and water clarity declined between the 1980s and 2015. During the same time, significantly increasing trends in nitrogen, phosphorus, turbidity, suspended sediments, chlorophyll a, and pH occurred. Current water-quality conditions (2012–2015) are not conducive to SAV survival and, in some cases, do not meet North Carolina water-quality standards for the protection of aquatic life. Water clarity declines appear to predate the SAV die-offs on the east side. Moving forward, SAV will serve as a primary indicator for lake health; and lake monitoring, research, and management efforts will focus on the restoration of aquatic grasses and water quality at Lake Mattamuskeet.

scholarly journals A Comparison of Planting Techniques for Submerged Aquatic Vegetation

EDIS ◽  
2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
Laura K. Reynolds ◽  
Carrie Reinhardt Adams ◽  
Enrique Latimer ◽  
Charles W. Martin ◽  
Christine E. Rohal ◽  
...  
Keyword(s):  
Water Quality ◽  
Food Web ◽  
Aquatic Ecosystems ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Multiple Methods ◽  
Plant Survival ◽  
New Locations ◽  
Soil And Water ◽  
Important Habitat

Submerged aquatic vegetation has numerous benefits for aquatic ecosystems, from improving water quality to providing important habitat that supports a diverse food web. This new 6-page publication of the UF/IFAS Department of Soil and Water Sciences describes the breadth of options available to managers who wish to plant SAV at new locations. Because all methods have both benefits and drawbacks, and because all planting locations have different (often unknown) challenges for plant survival, managers may choose to try multiple methods to increase the likelihood for success. Written by Laura Reynolds, Carrie Reinhardt Adams, Enrique Latimer, Charles W. Martin, Christine Rohal, and Jodi Slater.https://edis.ifas.ufl.edu/ss685

scholarly journals Environmental factors affecting coastal and estuarine submerged aquatic vegetation (SAV)

2021 ◽  
Author(s):  
Eve Eisemann ◽  
Catherine Thomas ◽  
Matthew Balazik ◽  
Damarys Acevedo-Mackey ◽  
Safra Altman
Keyword(s):  
Water Quality ◽  
Environmental Factors ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
The United States ◽  
Project Planning ◽  
Limiting Factors ◽  
Ecosystem Functions ◽  
Engineering Project ◽  
Coastal Marine

Submerged aquatic vegetation (SAV) growing in estuarine and coastal marine systems provides crucial ecosystem functions ranging from sediment stabilization to habitat and food for specific species. SAV systems, however, are sensitive to a number of environmental factors, both anthropogenic and natural. The most common limiting factors are light limitation, water quality, and salinity, as reported widely across the literature. These factors are controlled by a number of complex processes, however, varying greatly between systems and SAV populations. This report seeks to conduct an exhaustive examination of factors influencing estuarine and coastal marine SAV habitats and find the common threads that tie these ecosystems together. Studies relating SAV habitats in the United States to a variety of factors are reviewed here, including geomorphological and bathymetric characteristics, sediment dynamics, sedimentological characteristics, and water quality, as well as hydrologic regime and weather. Tools and methods used to assess each of these important factors are also reviewed. A better understanding of fundamental environmental factors that control SAV growth will provide crucial information for coastal restoration and engineering project planning in areas populated by SAVs.

scholarly journals Assessing the occurrence of cyanotoxins in two urban reservoirs through a community science monitoring program

2021 ◽  
Author(s):  
◽  
Emily C. Kinzinger
Keyword(s):  
Water Quality ◽  
High School Students ◽  
Monitoring Program ◽  
Water Quality Monitoring ◽  
Quality Parameters ◽  
Cyanobacterial Blooms ◽  
Environmental Drivers ◽  
School Students ◽  
One Year ◽  
Community Science

Cyanobacterial blooms are an ongoing threat to aquatic systems worldwide. These potentially toxic blooms have typically been observed in summer to early fall, but there are increasing reports of blooms in colder seasons. From the few studies available, weknow that blooms can produce toxins in the winter. The objective of this research was to assess the year-round presence, concentration, and environmental drivers of the cyanotoxins microcystin and cylindrospermopsin in two reservoirs located in Columbia, Missouri, USA. To fulfill this objective, I coordinated and managed the Reservoir Observer Student Scientists (ROSS) program. This community science initiative combined educating high school students about limnology and cyanobacterial blooms with training students hands-on to collect weekly water quality samples. Data for this project was collected over two years in Bethel Lake and one year in Stephens Lake. We found detectable concentrations of the cyanotoxins year-round. There was no relationship between microcystin nor cylindrospermopsin and chlorophyll-a in either reservoir. Presence and concentration of microcystin and cylindrospermopsin were related to physical water quality parameters in Bethel Lake. This study provides evidence for the necessity of year-round water quality monitoring.

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.

scholarly journals SUITABILITY ANALYSIS OF FLOATING CAGE CULTURE OF GROUPER FISH USING GIS IN RINGGUNG WATERS OF LAMPUNG

2017 ◽  
Vol 9 (1) ◽  
pp. 151-159
Author(s):  
Indah Febry Hastari ◽  
Rahmat Kurnia ◽  
M. Mukhlis Kamal
Keyword(s):  
Water Quality ◽  
Spatial Analysis ◽  
Dissolved Oxygen ◽  
Current Velocity ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Water Transparency ◽  
Suitability Analysis ◽  
Cage Culture ◽  
Velocity Water

The study aims to determine suitability of floating cage (KJA) culture of grouper fish in Ringgung waters of Lampung. Data were analysed using GIS for spatial analysis at five stations.  There were 10 water quality parameters measured, such as bathimetry, current velocity, water transparency, temperature, salinity, pH, dissolved oxygen, nitrate, ammonia, and phosphate. Three suitability criteria, i.e very suitable, suitable, and not suitable were used to determine the suitability of floating cage culture of grouper fish. The results show that from 99.168,5 ha of the total area used for floating cage culture of grouper fish, about 85,94% covering 8522,16 ha were classified as very suitable, 5,64% covering 559,69 ha classified as suitable, and  8,42% covering 835 ha classified as not suitable.                                     Keywords : grouper culture, suitability, Ringgung waters, Lampung Province, GIS

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