Quantification of internal phosphorus load in large, partially polymictic and mesotrophic Lake Simcoe, Ontario

Nürnberg, Gertrud K.; LaZerte, Bruce D.; Loh, Pei Sun; Molot, Lewis A.

doi:10.1016/j.jglr.2013.03.017

Cited by 59 publications

(45 citation statements)

References 24 publications

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“…This mesotrophic, P-limited ) lake displays no long-term changes in TP concentrations or bottom-water oxygen concentrations, despite significant efforts to reduce external TP loading from the watershed ). There have, however, been significant decreases in the hypoxic factor (i.e., the number of days that an area equivalent to the bay's surface area is overlain by water with ≤2 mg·L −1 of dissolved oxygen; Nürnberg et al 2013a). Internal P loading is an important regulator of pelagic productivity in this large lake, as its timing during the autumn months corresponds to the year-round peak in primary production , total algal biomass (Baranowska et al 2013), and cyanobacteria biomass (Nürnberg et al 2013b).…”

Section: Lake Simcoementioning

confidence: 99%

“…In Lake Simcoe, dreissenids serve as a significant source of P with excretion rates as high as 776 mg SRP·m −2 ·year −1 , which is approximately seven times higher than either the external or internal P loading rates (86 and 100 mg TP·m −2 ·year −1 , respectively; Nürnberg et al 2013a). In addition to serving as a source of P, dreissenids also have the ability to change the sediment redox conditions with implications for P release.…”

Section: Nearshore Environmentsmentioning

confidence: 99%

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Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

193

133

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Many physical, chemical, and biological processes in freshwater ecosystems mobilize the nutrient phosphorus (P) from sediments, which in turn may contribute to the formation of harmful algal blooms. Here, we critically reviewed internal P loading in Canadian fresh waters to understand the geographic patterns and environmental drivers of this important process. From 43 publications, we consolidated 618 estimates of internal P loading from Canadian freshwater ponds, lakes, reservoirs, and coastal wetlands (n = 70). Expressed in terms of total P, short-term gross rates in sediment samples (L gross ) ranged from −27 to 54 mg·m −2 ·day −1 (n = 461), while long-term net rates in whole ecosystems (L net ) ranged from −1694 to 10 640 mg·m −2 ·year −1 (n = 157). The main environmental drivers of this variation were oxygen, pH, geology, and trophic state. Internal P loading tended to be higher during the open-water season and most prominent in small prairie lakes. Priorities for future research on internal P loading should include resolving methodological problems, assessing the relative importance of different mechanisms, examining the influence of anthropogenic activities, and quantifying rates in understudied ecosystems. Résumé :De nombreux processus physiques, chimiques et biologiques dans les écosystèmes d'eau douce mobilisent le phosphore (P), un élément nutritif, des sédiments, ce qui peut favoriser la formation de fleurs d'eau néfastes. Nous avons effectué un examen critique de l'apport interne de P dans les plans d'eau douce canadiens afin de comprendre les motifs de répartition géographique et les facteurs environnementaux qui influent sur cet important processus. À la lumière de 43 publications, nous avons colligé 618 estimations de l'apport interne de P d'étangs, de lacs, de réservoirs et de milieux humides littoraux d'eau douce canadiens (n = 70). Exprimés en termes de P total, les taux d'apport de P à court terme pour les échantillons de sédiments (L gross ) vont de −27 à 54 mg·m -2 ·jour -1 (n = 461), alors que les taux nets à long terme à l'échelle de l'écosystème (L net ) vont de −1694 à 10 640 mg·m -2 ·an -1 (n = 157). Les principaux facteurs environnementaux influant sur ces variations sont l'oxygène, le pH, la géologie et l'état trophique. L'apport interne de P tend à être plus élevé durant la période d'eau libre et le plus marqué dans les petits lacs de prairie. La priorité des travaux futurs sur l'apport interne de P devrait porter sur la résolution de problèmes méthodologiques, l'évaluation de l'importance relative de différents mécanismes, l'examen de l'influence des activités humaines et la quantification des taux dans les écosystèmes sous-étudiés. [Traduit par la Rédaction]

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Section: Lake Simcoementioning

confidence: 99%

Section: Nearshore Environmentsmentioning

confidence: 99%

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

193

133

View full text Add to dashboard Cite

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“…P release from sediments is generally very low during winter due to low water temperatures. If sampling was not conducted during winter, assume that P flux was 0 for that season 14,15 . 3.…”

Section: Internal P Load Calculationmentioning

confidence: 99%

“…3. Because the majority of internal P release occurs during summer, annual internal P flux can be coarsely estimated from summer measurements alone in the absence of seasonal data 2,15,17 . For this approach, calculate the P flux according to Section 4.1.1 and assume 0 flux for all seasons except summer.…”

Section: Internal P Load Calculationmentioning

confidence: 99%

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Ogdahl

Steinman

Weinert

2014

JoVE

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Eutrophication is a water quality issue in lakes worldwide, and there is a critical need to identify and control nutrient sources. Internal phosphorus (P) loading from lake sediments can account for a substantial portion of the total P load in eutrophic, and some mesotrophic, lakes. Laboratory determination of P release rates from sediment cores is one approach for determining the role of internal P loading and guiding management decisions. Two principal alternatives to experimental determination of sediment P release exist for estimating internal load: in situ measurements of changes in hypolimnetic P over time and P mass balance. The experimental approach using laboratory-based sediment incubations to quantify internal P load is a direct method, making it a valuable tool for lake management and restoration.Laboratory incubations of sediment cores can help determine the relative importance of internal vs. external P loads, as well as be used to answer a variety of lake management and research questions. We illustrate the use of sediment core incubations to assess the effectiveness of an aluminum sulfate (alum) treatment for reducing sediment P release. Other research questions that can be investigated using this approach include the effects of sediment resuspension and bioturbation on P release.The approach also has limitations. Assumptions must be made with respect to: extrapolating results from sediment cores to the entire lake; deciding over what time periods to measure nutrient release; and addressing possible core tube artifacts. A comprehensive dissolved oxygen monitoring strategy to assess temporal and spatial redox status in the lake provides greater confidence in annual P loads estimated from sediment core incubations.

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Quantification of Anoxia and Hypoxia in Water Bodies

Nürnberg¹

2019

Encyclopedia of Water

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Anoxia and hypoxia are wide‐spread in freshwater systems and have been increasing in response to anthropogenic disturbances and climate change with biological and chemical implications. The concept of the anoxic factor to quantify anoxia and of the hypoxic factor for higher levels of dissolved oxygen concentration (DO) in lakes, reservoirs, and river sections has facilitated the exploration of hypoxia in a number of applications. This method condenses information from numerous individual DO profiles into annual values or factors that are comparable between and within lakes and hence invites the formulation and testing of hypotheses related to the DO status in water bodies. Besides the definition of the factors, proven and potential applications are described. They include the description of annual and spatial trend in anoxia or hypoxia, the evaluation of restoration techniques with respect to hypolimnetic oxygen depletion, the determination of internal phosphorus loading in stratified and polymictic lakes, the exploration of habitat constraints of fish due to hypoxia, and the examination of potential effects of climatic change on DO content and internal phosphorus loading.

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Quantification of internal phosphorus load in large, partially polymictic and mesotrophic Lake Simcoe, Ontario

Cited by 59 publications

References 24 publications

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Quantification of Anoxia and Hypoxia in Water Bodies

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