Reconstructing phosphorus levels using models based on the modern diatom assemblages of 55 lakes in southern Quebec

Tremblay, R R; Pienitz, Reinhard; Legendre, Pierre

doi:10.1139/cjfas-2013-0469

Cited by 17 publications

(7 citation statements)

References 44 publications

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“…Hall and Smol, 2010;Tremblay et al, 2014). An abrupt appearance of abundant diatoms amenable to higher P and/ or N loading is thus reliable evidence of lake eutrophication, especially after a period of landscape stability.…”

Section: Eutrophication and Anoxiamentioning

confidence: 99%

“…The biological effects of eutrophication can be inferred from sedimentary organism assemblages; certain diatom taxa, in particular, are sensitive to specific nutrient concentrations (e.g. Hall and Smol, 2010; Tremblay et al, 2014). An abrupt appearance of abundant diatoms amenable to higher P and/or N loading is thus reliable evidence of lake eutrophication, especially after a period of landscape stability.…”

Section: Synthesis Of Lake Responses To Early Human Impactsmentioning

confidence: 99%

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First human impacts and responses of aquatic systems: A review of palaeolimnological records from around the world

Dubois

Saulnier‐Talbot

Mills

et al. 2017

The Anthropocene Review

126

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Lake sediments constitute natural archives of past environmental changes. Historically, research has focused mainly on generating regional climate records, but records of human impacts caused by land use and exploitation of freshwater resources are now attracting scientific and management interests. Long-term environmental records are useful to establish ecosystem reference conditions, enabling comparisons with current environments and potentially allowing future trajectories to be more tightly constrained. Here we review the timing and onset of human disturbance in and around inland water ecosystems as revealed through sedimentary archives from around the world. Palaeolimnology provides access to a wealth of information reflecting early human activities and their corresponding aquatic ecological shifts. First human impacts on aquatic systems and their watersheds are highly variable in time and space. Landscape disturbance often constitutes the first anthropogenic signal in palaeolimnological records. While the effects of humans at the landscape level are relatively easily demonstrated, the earliest signals of humaninduced changes in the structure and functioning of aquatic ecosystems need very careful investigation using multiple proxies. Additional studies will improve our understanding of linkages between human settlements, their exploitation of land and water resources, and the downstream effects on continental waters.

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Section: Eutrophication and Anoxiamentioning

confidence: 99%

Section: Synthesis Of Lake Responses To Early Human Impactsmentioning

confidence: 99%

First human impacts and responses of aquatic systems: A review of palaeolimnological records from around the world

Dubois

Saulnier‐Talbot

Mills

et al. 2017

The Anthropocene Review

126

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show abstract

“…However, in many natural ecosystems, phosphorus is the main element limiting primary productivity (Tremblay et al . ).…”

Section: Discussionmentioning

confidence: 97%

A multiproxy record of the Younger Holsteinian Oscillation (YHO) in the Ossówka profile, eastern Poland

Nitychoruk

Bińka

Sienkiewicz

et al. 2018

Boreas

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The laminated lacustrine succession at Oss owka in eastern Poland, which is largely the equivalent of MIS 11c, is amongst the best-developed sites in Europe that cover this time period. Close inspection of the depth interval between 35.0 and 42.5 m in a 55-m-long core shows an environmental crisis at a depth of 40.95 m that lasted approximately 800 years and resulted in almost complete extinction of fir (Abies) from the communities existing at that time. Geochemical analyses reveal a simultaneous increase in sulphur in the deposits and a change in stable carbon and oxygen isotope ratios towards higher values, as well as a significant increase in the thickness of the laminae (up to 5 mm). Diatom studies show a clear increase in benthic diatoms in this interval, implying a decrease in water level. However, the predominance of such forms was probably caused by the elimination of planktonic diatoms by invasive blooms of Tetraedron, rather than lower lake levels, evidence of which was not noted in the pollen spectra. Hence, all these changes in the lake may have been triggered by the destruction of fir trees, the gradual decomposition of dead trunks and some inconspicuous geomorphological disturbances caused by wind throw. They resulted in a supply of micronutrients to the basin, an increase in varve thickness and rapid oscillations in the abundance and composition of algae and changes in the geochemical status of the lake. Rapid and significant drops in winter temperatures appear to be responsible for the extinction of fir. Alternatively, late frost in spring or hot and dry summers may have affected microsporophyll growth and the fir physiology as known from extant Abies populations. This environmental crisis, which is termed the Younger Holsteinian Oscillation (YHO), is noted at only a few sites. At Dethlingen (Germany), where hornbeam communities disappear at that time, a drop in summer temperatures is suggested to have been the driving force. We suggest that, at Oss owka, a drop in winter temperatures, late frost, or summer drought at the very start of the YHO are possible causes of the near-extinction of fir.

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“…Multiple mechanisms related to human activities further contribute to the loading of P in lake ecosystems, including the use of fertilizers and manure in agricultural fields (presently located as close as 1 to 2 km east of Lac Noir), septic leaching into local groundwater and surface water, or atmospheric deposition of dust particles (Riemersma et al, 2006). Diatom calibration sets of lakes in southern Ontario and Québec suggest that S. minutulus has a weighted average (optima) of 549.5 μg/L for TN (Christie and Smol, 1993) and 17.0 μg/L for TP (Tremblay et al, 2014). The peak in S. minutulus between AD 1870 and 1930 at Lac Noir was therefore reflective of meso-eutrophic conditions associated with anthropogenic activities and indicated TN and TP values that were roughly double those observed in the modern surface sample collected from Lac Noir soon after the core was retrieved (Cooper et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

A high-resolution paleolimnological study of climate and human impacts on Lac Noir, Québec, over the past 1000 yr

Neil

Gajewski

2018

Quat. res.

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Diatom assemblages in lake sediments of Lac Noir, southwestern Québec, were studied at a resolution of 10 yr to determine principal drivers of primary producers for the past ~1000 yr. Generalized additive modeling revealed strong links between broadscale climate intervals of the late Holocene, forest composition, and diatom flora. During the Medieval Warm Period (~AD 1200) and onset of the Little Ice Age (~AD 1450), increases in Tabellaria flocculosa str. IIIp at the expense of Discostella stelligera reflected low lake productivity. At AD 1630, an abrupt shift to cooler temperatures and dry conditions triggered a decline in hemlock (Tsuga), replaced by disturbance and cool-adapted taxa. Greater nutrient availability and soil erosion in the catchment led to a corresponding and rapid increase in diatoms with higher optima for nitrogen, such as Asterionella formosa and Fragilaria crotonensis. After AD 1870, an increase in pollen of taxa associated with disturbances signaled the arrival of Euro-Canadians, and associated nutrient inputs to the lake triggered increases in Stephanodiscus minutulus and Achnanthidium minutissimum. Overall results of the study indicate that climate played an important underlying role in lake-ecosystem dynamics; however, disturbances affecting forest composition had more direct influences on the diatom communities of Lac Noir.

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Reconstructing phosphorus levels using models based on the modern diatom assemblages of 55 lakes in southern Quebec

Cited by 17 publications

References 44 publications

First human impacts and responses of aquatic systems: A review of palaeolimnological records from around the world

First human impacts and responses of aquatic systems: A review of palaeolimnological records from around the world

A multiproxy record of the Younger Holsteinian Oscillation (YHO) in the Ossówka profile, eastern Poland

A high-resolution paleolimnological study of climate and human impacts on Lac Noir, Québec, over the past 1000 yr

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