A weighted—averaging regression and calibration model for inferring total phosphorus concentration from diatoms in British Columbia (Canada) lakes

Hall, Roland I.; Smol, John P.

doi:10.1111/j.1365-2427.1992.tb00551.x

Cited by 300 publications

(194 citation statements)

References 39 publications

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“…Within paleolimnological approaches, past [TP] has been quite usually inferred from diatom remains (Hall and Smol 1992). Because some long-term monitoring data were also available, we were able to compared DI-TP to measured water [TP].…”

Section: Discussionmentioning

confidence: 86%

Local forcings affect lake zooplankton vulnerability and response to climate warming

Alric

Jenny

Berthon

et al. 2013

Ecology

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Abstract. While considerable insights on the ecological consequences of climate change have been gained from studies conducted on remote lakes, little has been done on lakes under direct human exposure. Ecosystem vulnerability and responses to climate warming might yet largely depend on the ecological state and thus on local anthropogenic pressures. We tested this hypothesis through a paleolimnological approach on three temperate large lakes submitted to rather similar climate warming but varying intensities of analogous local forcings (changes in nutrient inputs and fisheries management practices). Changes in the structure of the cladoceran community were considered as revealing for alterations, over the time, of the pelagic food web. Trajectories of the cladoceran communities were compared among the three study lakes (Lakes Geneva, Bourget, and Annecy) over the last 70-150 years. Generalized additive models were used to develop a hierarchical understanding of the respective roles of local stressors and climate warming in structuring cladoceran communities. The cladoceran communities were not equally affected by climate warming between lakes. In Lake Annecy, which is the most nutrient-limited, the cladoceran community was essentially controlled by local stressors, with very limited impact of climate. In contrast, the more nutrient-loaded Lakes Geneva and Bourget were more sensitive to climate warming, although the magnitude of their responses and the pathways under which climate warming affected the communities varied between the two lakes. Finally, our results demonstrated that lake vulnerability and responses to climate warming are modulated by lake trophic status but can also be altered by fisheries management practices through changes in fish predation pressure.

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Section: Discussionmentioning

confidence: 86%

Local forcings affect lake zooplankton vulnerability and response to climate warming

Alric

Jenny

Berthon

et al. 2013

Ecology

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“…We also determined concentrations of dissolved organic carbon (DOC), as this material can play an important role in attenuating light in lake ecosystems (25). Epilimnetic Diatoms (Bacillariophyceae) are unicellular photoautotrophic algae that are highly sensitive to changes in nutrient concentrations, and often dominate primary production in oligotrophic lakes (27,28). We determined diatom community structure in surface sediments of the subset of 18 lakes as well as down-core assemblages in six lakes (three GSF, three SF).…”

Section: Methodsmentioning

confidence: 99%

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Saros

Rose

Clow

et al. 2010

Environ. Sci. Technol.

112

107

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See next page for additional authorsFollow this and additional works at: https://digitalcommons.unl.edu/geosciencefacpub Part of the Earth Sciences CommonsThis Article is brought to you for free and open access by the Earth and Atmospheric Sciences, Department of at DigitalCommons@University of Nebraska -Lincoln. It has been accepted for inclusion in Papers in the Earth and Atmospheric Sciences by an authorized administrator of DigitalCommons@University of Nebraska -Lincoln. Alpine glaciers have receded substantially over the last century in many regions of the world. Resulting changes in glacial runoff not only affect the hydrological cycle, but can also alter the physical (i.e., turbidity from glacial flour) and biogeochemical properties of downstream ecosystems. Here we compare nutrient concentrations, transparency gradients, algal biomass, and fossil diatom species richness in two sets of high-elevation lakes: those fed by snowpack melt alone (SF lakes) and those fed by both glacial and snowpack meltwaters (GSF lakes). We found that nitrate (NO 3 -) concentrations in the GSF lakes were 1-2 orders of magnitude higher than in SF lakes. Although nitrogen (N) limitation is common in alpine lakes, algal biomass was lower in highly N-enriched GSF lakes than in the N-poor SF lakes. Contrary to expectations, GSF lakes were more transparent than SF lakes to ultraviolet and equally transparent to photosynthetically active radiation. Sediment diatom assemblages had lower taxonomic richness in the GSF lakes, a feature that has persisted over the last century. Our results demonstrate that the presence of glaciers on alpine watersheds more strongly influences NO 3 -concentrations in high-elevation lake ecosystems than any other geomorphic or biogeographic characteristic. Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

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“…However, the models from the 251-lake dataset represent an improvement over many of these smaller calibration datasets. For example, the 46-lake dataset of Hall and Smol (1992) from B.C. had a relatively high apparent coefficient of determination of 0.78, which declined to 0.28 when bootstrapped (Cumming et al, 1995), due to a lack of redundancy in taxa that could not be reproduced upon bootstrapping.…”

Section: Modern-day Calibration Datasetmentioning

confidence: 99%

Tracking past changes in lake-water phosphorus with a 251-lake calibration dataset in British Columbia: tool development and application in a multiproxy assessment of eutrophication and recovery in Osoyoos Lake, a transboundary lake in Western North America

et al. 2015

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Recently, there has been an active discussion about the potential and challenges of tracking past lake-water trophic state using paleolimnological methods. Herein, we present analyses of the relationship between modern-day diatom assemblages from the surface sediments of 251 fresh-water lakes from British Columbia and contemporary limnological variables. Total phosphorus (TP) was significantly related to the modern distribution of diatom assemblages. The large size of this new calibration dataset resulted in higher abundances and occurrences of many diatom taxa thereby allowing a more accurate quantification of the optima of diatom taxa to TP in comparison to previous smaller calibration datasets. Robust diatom-based TP inference models with a moderate predictive power were developed using weighted-averaging regression and calibration. Information from the calibration dataset was used to interpret changes in the diatom assemblages from the north and south basins of Osoyoos Lake, in conjunction with fossil pigment analyses. Osoyoos Lake is a large salmon-bearing lake that straddles the British Columbia-Washington border and has undergone cultural eutrophication followed by recovery due to substantial mitigation efforts in managing sources of nutrients. Both diatom assemblages and sedimentary pigments indicate that eutrophication began c. 1950 in the north basin and c. 1960 in the southern basin, reaching peak levels of production between 1960 and 1990, after which decreases in sedimentary pigments occurred, as well as decreases in the relative abundance and concentrations of diatom Cumming et al.Tracking eutrophication and recovery using Paleolimnology taxa inferred to have high TP optima. Post-1990 changes in the diatom assemblage suggests conditions have become less productive with a shift to taxa more indicative of lower TP optima in concert with measurements of declining TP, although two of these diatom taxa, Cyclotella comensis and Cyclotella gordonensis, that were previously rare are now abundant.

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A weighted—averaging regression and calibration model for inferring total phosphorus concentration from diatoms in British Columbia (Canada) lakes

Cited by 300 publications

References 39 publications

Local forcings affect lake zooplankton vulnerability and response to climate warming

Local forcings affect lake zooplankton vulnerability and response to climate warming

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Tracking past changes in lake-water phosphorus with a 251-lake calibration dataset in British Columbia: tool development and application in a multiproxy assessment of eutrophication and recovery in Osoyoos Lake, a transboundary lake in Western North America

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