Recent water quality trends and a comparison to sediment-core records for two riverine lakes of the Upper Mississippi River basin: Lake St. Croix and Lake Pepin

Lafrancois, Brenda Moraska; Magdalene, Suzanne; Johnson, D. Kent

doi:10.1007/s10933-008-9294-3

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Our eight study sites included four riverine sites located below St. Croix Falls and four lacustrine sites located in Lake St. Croix, with one site in each of four sub-basins; all sites were known to contain mussels. These sites have been characterized by previous research [ 12 , 13 ] to represent contrasting water quality conditions and phytoplankton communities that may potentially affect available food quality (seston and benthic) and ultimately affect juvenile mussel survival and growth.…”

Section: Methodsmentioning

confidence: 99%

“…A paleolimnological study found that phosphorus loading rates to Lake St. Croix, a natural riverine impoundment at the lower end of the river, were four times higher than before European settlement [ 12 ]. Although phosphorus and sediment inputs to Lake St. Croix decreased from 1976 – 2004, nitrate inputs have increased [ 13 ] and dramatic changes in algal communities have occurred, with a marked shift from benthic to more planktonic species [ 14 ]. Bloom-forming cyanobacteria are now common in late summer throughout Lake St. Croix [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of food resources on the fatty acid composition, growth and survival of freshwater mussels

Bartsch

Richardson

et al. 2017

PLoS ONE

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Increased nutrient and sediment loading in rivers have caused observable changes in algal community composition, and thereby, altered the quality and quantity of food resources available to native freshwater mussels. Our objective was to characterize the relationship between nutrient conditions and mussel food quality and examine the effects on fatty acid composition, growth and survival of juvenile mussels. Juvenile Lampsilis cardium and L. siliquoidea were deployed in cages for 28 d at four riverine and four lacustrine sites in the lower St. Croix River, Minnesota/Wisconsin, USA. Mussel foot tissue and food resources (four seston fractions and surficial sediment) were analyzed for quantitative fatty acid (FA) composition. Green algae were abundant in riverine sites, whereas cyanobacteria were most abundant in the lacustrine sites. Mussel survival was high (95%) for both species. Lampsilis cardium exhibited lower growth relative to L. siliquoidea (p <0.0001), but growth of L. cardium was not significantly different across sites (p = 0.13). In contrast, growth of L. siliquoidea was significantly greater at the most upstream riverine site compared to the lower three lacustrine sites (p = 0.002). In situ growth of Lampsilis siliquoidea was positively related to volatile solids (10 – 32 μm fraction), total phosphorus (<10 and 10 – 32 μm fractions), and select FA in the seston (docosapentaeonic acid, DPA, 22:5n3; 4,7,10,13,16-docosapentaenoic, 22:5n6; arachidonic acid, ARA, 20:4n6; and 24:0 in the <10 and 10 – 32 μm fractions). Our laboratory feeding experiment also indicated high accumulation ratios for 22:5n3, 22:5n6, and 20:4n6 in mussel tissue relative to supplied algal diet. In contrast, growth of L. siliquiodea was negatively related to nearly all FAs in the largest size fraction (i.e., >63 μm) of seston, including the bacterial FAs, and several of the FAs associated with sediments. Reduced mussel growth was observed in L. siliquoidea when the abundance of cyanobacteria exceeded 9% of the total phytoplankton biovolume. Areas dominated by cyanobacteria may not provide sufficient food quality to promote or sustain mussel growth.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of food resources on the fatty acid composition, growth and survival of freshwater mussels

Bartsch

Richardson

et al. 2017

PLoS ONE

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“…Larger agricultural reservoirs have nevertheless demonstrated only limited internal nutrient loading over decadal timescales (Lafrancois et al, ). Thus, the long‐term effectiveness of large reservoirs at mitigating downstream N and P loads, particularly in heavy agricultural areas like the midwestern U.S., is unclear (Basu et al, ).…”

Section: Introductionmentioning

confidence: 99%

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Shaughnessy

Sloan

Corcoran

et al. 2019

Water Resources Research

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Reservoirs along rivers have the potential to act as nutrient sinks (e.g., denitrification and sedimentation) or sources (e.g., decomposition and redox changes), potentially reducing or enhancing nutrient loads downstream. This study investigated the spatial and temporal variability of water and lakebed sediment chemistry for an agricultural reservoir, Carlyle Lake (Illinois, U.S.), to assess the role of sediments as nutrient sinks or sources. Samples were collected across the reservoir over a 2‐year period. We measured N‐ and P‐species in water at the sediment‐water interface, in sediment porewaters, and loosely bound to sediment exchange sites. Total N, total P, total C, organic matter, Fe, Mn, and grain size were measured in bulk sediments. We observed a strong gradient in sedimentary total N, total P, total C, organic matter, and metals along the reservoir, with the lowest concentrations at the river mouth and the highest concentrations near the dam. Additionally, we did a long‐term nutrient mass balance using historical water quality data for streams entering and exiting the reservoir and the reservoir itself. Mass balance calculations showed that Carlyle Lake, on average, removed 2,738 Mg N/year and released 121 Mg P/year over the multidecadal observation period. While N was consistently removed from the system over time, P was initially stored in, but later released from, the reservoir. The subsequent release of legacy P from the reservoir led to higher outgoing, compared with incoming, P loads. Thus, reservoirs in intensively managed landscapes can act as sinks for N but sources for P over decadal timescales.

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“…In particular, greater human population densities, greater agricultural land use, and less forest result in greater nutrient loading in the MISS than in the SACN. These patterns have existed for at least a century (Lafrancois, Magdalene, & Johnson, ) but with indications of declining phosphorus and increasing nitrogen load in the SACN and MISS rivers. Management of agriculturally derived sediments may be contributing to declining P loads, whereas increasing nitrate loads likely originate from a number of sources including atmospheric, agricultural, and urban (Kloiber, ; Kroening & Andrews, ).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen cycling in large temperate floodplain rivers of contrasting nutrient regimes and management

Richardson

Bartsch

et al. 2018

River Research & Apps

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Hydraulic connection between channels and floodplains ("connectivity") is a fundamental determinant of ecosystem function in large floodplain rivers. Factors controlling material processing in these rivers depend not only on the degree of connectivity but also on the sediment conditions, nutrient loads, and source. Nutrient cycling in the nutrient-rich upper Mississippi River (MISS) is relatively well studied, whereas that of less eutrophic tributaries is not (e.g., St Croix River; SACN). We examined components of nitrogen cycling in 2 floodplain rivers of contrasting nutrient enrichment and catchment land use to test the hypothesis that N-cycling rates will be greater in the MISS with elevated nutrient loads and productivity in contrast to the relatively nutrient-poor SACN.Nitrate (NO 3 − -N) concentrations were greatest in flowing habitats in the MISS and often undetectable in isolated backwaters except where groundwater inputs occurred.In the SACN, NO 3 − -N concentrations were greatest in the flowing backwater where groundwater inputs were high. Ambient nitrification in the MISS was twice that in the SACN and tended to be lowest in the main channel. Denitrification was 3× greater in the MISS than that in the SACN, N-limited in both rivers. Community production/respiration was >1 in the MISS and likely provisioned labile C to fuel microbial metabolism and dissimilatory NO 3 − -N reduction, whereas the heterotrophic (production/respiration < 1) nature of the SACN likely limited microbial metabolism and NO 3 − -N dissimilation. It appears that N-cycling in the SACN was driven by groundwater, whereas that in the MISS was supported mainly by water column N-sources.

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Recent water quality trends and a comparison to sediment-core records for two riverine lakes of the Upper Mississippi River basin: Lake St. Croix and Lake Pepin

Cited by 10 publications

References 19 publications

Effects of food resources on the fatty acid composition, growth and survival of freshwater mussels

Effects of food resources on the fatty acid composition, growth and survival of freshwater mussels

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Nitrogen cycling in large temperate floodplain rivers of contrasting nutrient regimes and management

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