Oligotrophication from wetland epuration alters the riverine trophic network and carrying capacity for fish

Hudon, Christiane; Cattaneo, Antonella; Poirier, Anne-Marie Tourville; Brodeur, Philippe; Dumont, Pierre; Mailhot, Y.; Amyot, Jean-Pierre; Despatie, Simon-Pierre; Lafontaine, Yves de

doi:10.1007/s00027-011-0243-2

Cited by 40 publications

(7 citation statements)

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“…Starting in 2012 the strategic research cluster GRIL (Groupe de recherche interuniversitaire en limnologie) initiated a macrophyte and ecosystem service monitoring program of a c. 42 km 2 area of LSP downstream from the mouth of the Saint-François River (SFR; Figure 1). The established zone was selected due to characteristic extensive plant colonisation with high spatial variability in abundance (Vis et al, 2008;Hudon et al, 2012;de la Chenelière, Brodeur, & Mingelbier, 2014). The study zone includes approximately 60 measurement stations (Figure 1) that were surveyed at maximum macrophyte abundance (end of July, beginning of August) for a 6-year period (2012 to 2017).…”

Section: Study Areamentioning

confidence: 99%

A three‐dimensional numerical model investigation of the impact of submerged macrophytes on flow dynamics in a large fluvial lake

et al. 2019

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Aquatic plants (macrophytes) are known to affect flow dynamics, contributing to flow resistance. Most studies on flow‐vegetation interactions are performed in laboratory flumes and focus on the flow field around plants, with little research at the level of vegetation patches in large aquatic ecosystems. In most hydrodynamic models, increased drag due to plants is modelled by increasing the Manning's n roughness coefficient. The objectives of this study were to: (1) develop a three‐dimensional hydrodynamic model (Delft3D) applicable to large water bodies including a novel approach to represent macrophyte resistance (modified k‐ε turbulence closure model); and (2) compare the modelled flow with field measurements for different vegetation configurations and patch arrangements. Work was carried out in Lake Saint‐Pierre, a large fluvial lake of the St Lawrence River in Québec, Canada. Results showed a marked increase in residence time in the zone affected by macrophytes when using the modified k‐ε turbulence closure model compared to the Manning's n approach, particularly near the bed. An improved agreement with field measured depth‐averaged velocity is obtained with this novel approach (correlation coefficient of 0.80 compared to 0.46 with Manning's n only). In addition, a good fit was obtained between vertical velocity profiles modelled and measured in the macrophyte zone. Sensitivity analysis revealed that the additional drag due to plants was closely associated with plant height, but that plant density played only a minor role in retarding velocities. These findings indicate that it is possible to accurately quantify both the horizontal and vertical flow modulations resulting from submerged vegetation in large fluvial systems. Considering that the Delft3D model is capable of approximating measured velocity magnitude, preserving the logarithmic shape throughout the water column and reaching near‐zero velocities without increasing the roughness coefficient, we recommend this modelling approach for future research on the impact of macrophytes on flow at the scale of vegetation patches in large water bodies comparable to Lake Saint‐Pierre.

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Section: Study Areamentioning

confidence: 99%

A three‐dimensional numerical model investigation of the impact of submerged macrophytes on flow dynamics in a large fluvial lake

et al. 2019

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“…However, the inaccessibility of these invertebrates for fish predators (Camacho & Thacker, 2013) might contribute to a decoupling between the benthic and pelagic food chain of the St. Lawrence River. Indeed, replacement of submerged aquatic vegetation by mats of L. wollei in the St. Lawrence River (Vis et al, 2008) has been associated with a drop in habitat complexity, a shift from mollusc to amphipod dominance, decrease in fish biomass, and poor yellow perch recruitment (Tourville Poirier et al, 2010;Hudon et al, 2012). These responses exemplify the complex sequence of impacts of proliferation of L. wollei on aquatic ecosystems.…”

Section: An Ideal Substratum For Omnivorous Gammarusmentioning

confidence: 97%

Benthic cyanobacterial mats serve as a refuge and food for the amphipod Gammarus fasciatus

2015

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We investigated the ecological role of Lyngbya wollei (Farlow ex Gomont, comb. nov.) cyanobacterial mats in aquatic ecosystems, especially as a food source and shelter for the amphipod Gammarus fasciatus (Say). For this, we offered amphipods a choice between mats of L. wollei and either chlorophytes (Spirogyra, Rhizoclonium) or an artificial mat made of acrylic wool in laboratory experiment. Moreover, we reconstructed in situ amphipod diet using a dual isotope mixing model (d 13 C and d 15 N). G. fasciatus consistently selected the substratum offering the best light refuge (Acrylic [ Lyngbya = Rhizoclonium [ Spirogyra). Neither the presence/absence of saxitoxins, nor the tissue elemental composition and epiphyte abundance exerted any significant effect on substratum choice. L. wollei and its epiphytes constituted 36 and 24%, respectively, of the in situ diet of G. fasciatus, whereas chlorophytes, macrophytes, and associated epiphytes represented a less important fraction of its diet. Benthic cyanobacterial mats should be considered a good shelter and food source for small omnivorous invertebrates such as amphipods.

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“…A subsample of filamentous algae was preserved in lugol for subsequent microscopic identification (×250). Wet mass was converted to dry mass using previously established conversion factors for SAV (Hudon et al 2012) and filamentous species (Cattaneo et al 2013). All of the manipulations from sample collection to final biomass conversion are referred to “biomass treatments.”…”

Section: Materials and Proceduresmentioning

confidence: 99%

Combining quadrat, rake, and echosounding to estimate submerged aquatic vegetation biomass at the ecosystem scale

Botrel

Hudon

Biron

et al. 2023

Limnology & Ocean Methods

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Measuring freshwater submerged aquatic vegetation (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 overall relationship between quadrat and rake biomass is moderately strong (pseudo R 2 = 0.61) and varies with substrate type and SAV growth form. Rake biomass was also successfully estimated from biovolume (pseudo R 2 = 0.57), a biomass proxy derived from echosounding. In addition, the relationship was affected, in decreasing relevance, by SAV growth form, flow velocity, acoustic data quality, depth, and wind conditions. Sequential application of calibrations yielded predictions in agreement with quadrat observations, but echosounding predictions underestimated biomass in shallow areas (< 1 m) while outperforming point estimation in deep areas (> 3 m). Whole-system quadrat-equivalent biomass from echosounding differed by a factor of two from point survey estimates, suggesting echosounding is more accurate at larger scales owing to the increased sample size and better representation of spatial heterogeneity. To decide when an individual or a combination of techniques is profitable, we developed a step-by-step guideline. Given the risks of quadrat-scuba diver technique, we recommend developing a one-time quadrat-rake calibration, followed by the use of rake and echosounding when sampling at larger spatial and temporal scales. In this case, rake sampling becomes a valid ground truthing method for echosounding, also providing valuable species information and estimates in shallow waters where echosounding is inappropriate.

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Oligotrophication from wetland epuration alters the riverine trophic network and carrying capacity for fish

Cited by 40 publications

References 55 publications

A three‐dimensional numerical model investigation of the impact of submerged macrophytes on flow dynamics in a large fluvial lake

A three‐dimensional numerical model investigation of the impact of submerged macrophytes on flow dynamics in a large fluvial lake

Benthic cyanobacterial mats serve as a refuge and food for the amphipod Gammarus fasciatus

Combining quadrat, rake, and echosounding to estimate submerged aquatic vegetation biomass at the ecosystem scale

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