scholarly journals African manatee ( Trichechus senegalensis ) habitat suitability at Lake Ossa, Cameroon, using trophic state models and predictions of submerged aquatic vegetation

2021 ◽  
Author(s):  
Aristide K. Takoukam ◽  
Dylan G. E. Gomes ◽  
Mark V. Hoyer ◽  
Lucy W. Keith‐Diagne ◽  
Robert K. Bonde ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Trophic State ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
State Models

scholarly journals Sentinel-2 for mapping the spatio-temporal development of submerged aquatic vegetation at Lake Starnberg (Germany)

2019 ◽  
Vol 78 (1) ◽  
Author(s):  
Christine Fritz ◽  
Katja Kuhwald ◽  
Thomas Schneider ◽  
Juergen Geist ◽  
Natascha Oppelt
Keyword(s):  
Trophic State ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Environmental Changes ◽  
Light Availability ◽  
Empirical Method ◽  
Lake Ecosystems ◽  
In Situ Data ◽  
Spatio Temporal ◽  
Sentinel 2

Submerged aquatic vegetation (SAV) plays an important role in freshwater lake ecosystems. Due to its sensitivity to environmental changes, several SAV species serve as bioindicators for the trophic state of freshwater lakes. Variations in water temperature, light availability and nutrient concentration affect SAV growth and species composition. To monitor the trophic state as required by the European Water Framework Directive (WFD), SAV needs to be monitored regularly. This study analyses the development of macrophyte patches at Lake Starnberg, Germany, by exploring four Sentinel-2A acquired within the main growing season in August and September 2015. Two different methods of littoral bottom coverage assessment are compared, i.e. a semi-empirical method using depth-invariant indices and a physically based, bio-optical method using WASI-2D (Water Colour Simulator). For a precise Sentinel-2 imaging by date and hour, satellite measurements were supported by lake bottom spectra delivered by in situ data based reflectance models. Both methods identified vegetated and non-vegetated patches in shallow water areas. Furthermore, tall- and meadow-growing SAV growth classes could be differentiated. Both methods revealed similar results when focusing on the identification of sediment and SAV patches (R² from 0.56 to 0.81), but not for a differentiation on SAV class growth level (R² <0.42).

scholarly journals Novel approach for large‐scale monitoring of submerged aquatic vegetation – a nationwide example from Sweden

2021 ◽  
Author(s):  
Silvia Huber ◽  
Lars B. Hansen ◽  
Lisbeth T. Nielsen ◽  
Mikkel L. Rasmussen ◽  
Jonas Sølvsteen ◽  
...  
Keyword(s):  
Large Scale ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Novel Approach

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

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
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