Spatial Analysis of Production by Macrophytes, Phytoplankton and Epiphyton in a Large River System under Different Water-Level Conditions

Vis, Chantal; Hudon, Christiane; Carignan, Richard; Gagnon, Pierre

doi:10.1007/s10021-007-9021-3

Cited by 67 publications

(78 citation statements)

References 32 publications

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“…In Lake Saint-Pierre alone (LSP, &350 km 2 , Fig. 1, inset C), overall primary production (2000)(2001) was estimated at about 30 9 10 3 tonnes of carbon per year (105 g C m -2 year -1 ), distributed among phytoplankton (29-38%), epiphytes (14-19%), submerged (23%) and emergent (25-29%) macrophytes (Vis et al 2007). …”

Section: Study Areamentioning

confidence: 99%

“…After exiting Lake Ontario, the SLR flows through a succession of broad (2-12 kmwide) and shallow (mean depth 3-7 m) fluvial lakes, which are extensively colonized by submerged aquatic vegetation (Vis et al 2007;Lévesque et al 2017). Little interest has been given to the seasonal variations in carbon and nutrient flux as a result of within-river biological processes such as carbon fixation, nutrient assimilation and transformation by bacteria and primary producers.…”

Section: Introductionmentioning

confidence: 99%

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Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)

et al. 2017

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Increased flux of carbon and nutrients from human activities in river basins were linked to acidification and deepwater hypoxia in estuaries and coastal areas worldwide. Annual loads (1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) of suspended particulate matter (SPM), dissolved organic carbon (DOC), total nitrogen (TN) and total phosphorus (TP) were assessed at the Lake Ontario inlet of the St. Lawrence River (SLR) (7110 m 3 s -1 ) and its estuarine outlet at Québec City (12,090 m 3 s -1 ). Internal loads from the Ottawa River (1950 m 3 s -1 ), seventeen other tributaries, urban wastewaters, atmospheric deposition and erosion were also estimated. Erosion (65% of SPM, 29% of TP), inflow from Lake Ontario (42% of DOC, 47% of TN) and Ottawa River (28% of DOC) contributed important flux to the estuary. Loads from other tributaries (20 and 27% of TN and TP at Quebec City) largely exceeded municipal sources (6% of exported TN and TP) and require future remediation. Aquatic plants fixed 277,000 t of C, 49,000 t of N and 7000 t of P (May-Sept.), delaying the nutrient flux to the estuary and turning the SLR into a nutrient sink over summers of lowest discharge. Degradation of exported organic C could consume 5.4-7.1 million t O 2 year -1 in the estuary whereas SLR flux of N and P represent 31-47% and 7-14% of total annual estuarine flux, respectively. Carbon and Nitrogen flux from freshwaters partly explain the decline in pH and oxygen concentrations in deep estuarine waters thus highlighting the need to reduce diffuse sources of nutrients in the entire watershed.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)

et al. 2017

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“…Wetland ecosystems are impacted at all trophic levels by altered flow regimes with changes reported in the relative importance of primary producers (Nilsson and Svedmark 2002;Vis et al 2007), in invertebrate communities (González-Ortegón and Drake 2012), and fish composition (Poff and Allan 1995;Roy et al 2005;Xenopoulos and Lodge 2006). In aquaculture increasing water exchange normally improves water quality resulting in better survival and growth of the cultured organism (Pillay 1990).…”

Section: Introductionmentioning

confidence: 99%

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

et al. 2015

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Extensive aquaculture in coastal and estuarine wetlands can support both increased food production and wider ecosystem services when underpinned by effective management to promote productivity and hence food webs that support both commercial species and biodiversity. Changing hydrology, specifically water movement, within wetlands significantly impacts the physico-chemical properties of the water body and hence can be employed to manipulate productivity and alter patterns of recruitment of commercial species and may also transfer non-native species from the supplying water bodies. The reconstructed wetlands of Veta la Palma in the Doñana Natural Park are subjected to either a 1 % or 5 % d -1 water exchange with water drawn from the adjacent Guadalquivir estuary. This site provides an excellent opportunity for examining the effect of water management on the food webs that support both the birdlife and aquaculture activities for which this habitat is managed. Stable isotopes were used to examine food webs in three replicate lagoons under each water management scheme. In lagoons receiving higher water exchange, phytoplankton productivity appeared to be more important than benthic production in supporting food webs. Increased water exchange also changed the shape of the food webs, facilitated the colonisation of at least one non-native species and increased the importance of non-native species in the diets of large commercially harvested fish (> 60 % of seabass diet). Lagoons with high water flows also had between three and four times greater shrimp biomass than those of low flow lagoons. Non-native fauna were opportunistic omnivores, eating marginally more non-natives in lagoons with greater water exchange. Overall non-native cordgrass Spartina densiflora contributed only slightly more to food webs compared with the native reed Phragmites australis, despite the lagoon edge occupancy ratio of 9:1, respectively. Nonnatives also appear to enhance food provision for large predators and wetland birds, by increasing biomass, without competing for resources with native species, supporting the dual management objectives of aquaculture and waterbird conservation.

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“…Franc ?ois river and the l'Assomption river located, respectively, on the south and north shores, which strongly drain agricultural watersheds. CDOM input in the river from these two tributaries, in particular, and from other tributaries, in general, has already been documented by several authors [e.g., Frenette et al, 2003Frenette et al, , 2006Frenette et al, , 2012Vis et al, 2007;Massicotte and Frenette, 2011].…”

Section: Discussionmentioning

confidence: 73%

“…The SLR forms a complex system composed of a mosaic of heterogeneous zones such as fluvial lakes, connecting reaches and wetlands interacting with inflowing tributaries. In SLR, 21 principal tributaries drain a watershed of 1,600,000 km 2 , where land use is dominated by a high degree of urbanization near Montreal and areas of agriculture, pastures, forests, and wetlands in the mid and lower reaches of the stream system [Frenette et al, 2006, Vis et al, 2007. For instance, water intrusions from tributaries become distinct water masses flowing down the river and contributing to spatial and temporal heterogeneity in optical characteristics [Frenette et al, 2003[Frenette et al, , 2006Rice et al, 2006].…”

Section: Study Areamentioning

confidence: 99%

Relationship between water color, water levels, and climate indices in large rivers: Case of the St. Lawrence River (Canada)

Massicotte

Assani

Gratton

et al. 2013

Water Resources Research

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[1] The relationship between the color (measured with Landsat Thematic Mapper and Enhanced Thematic Mapper sensors in bands 1, 2, and 3) of St. Lawrence River (SLR) water and water levels (in SLR and Lake Ontario) was first analyzed, followed by the analysis of the relationship between water levels and four climate indices for the period from 1984 to 2009. Although there is a statistically significant relationship between these first two variables, this link depends on the strength of two factors: the type of color (band) and inflows from tributaries. Bands 1 (blue) and 2 (green) were negatively correlated with water levels. This correlation, however, is spatially influenced by water inflows from tributaries. Band 3 (red) showed no significant correlation with either water level. Over the same period, water levels were negatively correlated with the Atlantic multidecadal oscillation index. Results suggest that the color of waters in the SLR may be used as an indicator to monitor environmental and climate changes in its watershed.

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Spatial Analysis of Production by Macrophytes, Phytoplankton and Epiphyton in a Large River System under Different Water-Level Conditions

Cited by 67 publications

References 32 publications

Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)

Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

Relationship between water color, water levels, and climate indices in large rivers: Case of the St. Lawrence River (Canada)

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