2022
DOI: 10.1101/2022.03.15.484486
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Combining quadrat, rake and echosounding to estimate submerged aquatic vegetation biomass at the ecosystem scale

Abstract: Measuring freshwater submerged aquatic (SAV) biomass at large spatial scales is challenging and no single technique can cost effectively accomplish this while maintaining accuracy. We propose to combine and intercalibrate accurate quadrat-scuba diver technique, fast rake sampling and large scale echosounding. We found that the relationship between quadrat and rake biomass is moderately strong (R2 = 0.62, RMSECV = 2.19 g/m2) and varies with substrate type and SAV growth form. Rake biomass was also successfully … Show more

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Cited by 3 publications
(5 citation statements)
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“…Their current state of charophytes, occurrence of major species and maximum colonisation depths were assessed by mappings performed with underwater cameras or scuba diving along transects in 2017–2018 (Table 1). There are different methods to determine macrophyte coverage in lakes (e.g., Botrel et al, 2022; Lauridsen et al, 2015), but we opted for a rather simple approach. Similar to the five ecological classes that lakes have to be assigned to in the EU Water Framework Directive (e.g.…”
Section: Methodsmentioning
confidence: 99%
“…Their current state of charophytes, occurrence of major species and maximum colonisation depths were assessed by mappings performed with underwater cameras or scuba diving along transects in 2017–2018 (Table 1). There are different methods to determine macrophyte coverage in lakes (e.g., Botrel et al, 2022; Lauridsen et al, 2015), but we opted for a rather simple approach. Similar to the five ecological classes that lakes have to be assigned to in the EU Water Framework Directive (e.g.…”
Section: Methodsmentioning
confidence: 99%
“…Optical remote techniques will likely become more common in assessing SAV areas with the increase in hyperspectral capacity of new satellites, and greater accessibility of drones with improved sensors that could potentially be used in smaller lakes (Rowan & Kalacska, 2021). Hydroacoustics, however, have the advantage of being a tridimensional assessment of SAV quantities by reporting both SAV height and coverage across depths, thus simultaneously providing an estimation of SAV extent and biomass (Botrel et al, 2022; Duarte, 1987). Additionally, these techniques are best suited in turbid waters as in these conditions, only reasonable SAV detection is achieved from object‐based image analysis and optic sensors are typically blind at only 1‐ or 2‐m depth (de Grandpré et al, 2022; Krause et al, 2021; Rowan & Kalacska, 2021).…”
Section: Discussionmentioning
confidence: 99%
“…Daily velocity was estimated from Delft3D simulations, a tridimensional hydrodynamic model established for our study area (Bulat et al., 2019). Model simulations were run for each year using median, minimum, and maximum input discharges at Saint‐François over the SUNA mooring period and yearly spatial polygons of SAV height established from SAV echosounding surveys (Botrel et al., 2022). Mean depth‐average velocity was computed on the resulting spatial polygon grid of 70 m resolution at the outflow transect (7 polygons).…”
Section: Methodsmentioning
confidence: 99%
“…SAV species composition was dominated by Vallisneria americana and Potamogeton richardsonii , but also included Heteranthera dubia , Stuckenia pectinata , Elodea spp., Myriophyllum spp., and Chara spp. Because rake biomass collections are underestimated due to loss of plant material during sampling, rake estimates were converted to quadrat equivalency using a previously determined general relationship (Botrel et al., 2022).…”
Section: Methodsmentioning
confidence: 99%
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