Identifying reference conditions for dimictic north German lowland lakes: implications from paleoecological studies for implementing the EU-Water Framework Directive

Hübener, Thomas; Adler, Sven; Werner, Petra; Schwarz, Anja; Dreßler, Mirko

doi:10.1007/s10750-014-1992-4

Cited by 7 publications

(8 citation statements)

References 38 publications

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“…The early enrichment is such that reference values based on later periods would be substantial overestimates of minimally impaired conditions. For example, for our Trait 2 sites the late Holocene mean SI-TP of 17 mg m -3 is broadly consistent with the mean predisturbance DI-TP value (23 mg m -3 ), representing the period from 500 CE to more recent enrichment, found for the northern German sites (Hübener et al, 2015). This suggests that the 1500-year sediment profiles analysis by Hübener et al (2015), the longest measured DI-TP reference value records to date, still do not extend back to conditions of minimal human impairment.…”

Section: Lake Water Tp Concentrationssupporting

confidence: 85%

“…For example, for our Trait 2 sites the late Holocene mean SI-TP of 17 mg m -3 is broadly consistent with the mean predisturbance DI-TP value (23 mg m -3 ), representing the period from 500 CE to more recent enrichment, found for the northern German sites (Hübener et al, 2015). This suggests that the 1500-year sediment profiles analysis by Hübener et al (2015), the longest measured DI-TP reference value records to date, still do not extend back to conditions of minimal human impairment. Of perhaps greater importance is the observation that the model predicted reference values for these lakes (European lake type CB 1; Poikane, 2009) is 24 mg m -3 , very much greater than our Trait 2 average mid Holocene SI-TP value (5.3 mg m -3 ) and similar instead to our farming-impacted late-Holocene average value (17.2 mg m -3 ).…”

Section: Lake Water Tp Concentrationssupporting

confidence: 85%

“…Battarbee et al (2011) found the first unambiguous lake sediment evidence of nutrient enrichment linked to human activity from 1850 CE onwards and typically after 1900 CE, an observation supported by . However, other studies have found evidence of enrichment predating 1850 CE (see Hübener et al, 2015 andBjerring et al, 2008), particularly in lowland agricultural areas, in some cases suggesting that periods of minimal impact can be found "only by considering century to millennial timescales" (Bradshaw et al, 2006). Considering this, Hübener et al (2015) cautioned against setting a fixed age for pristine lake conditions, themselves finding the age of initial impairment extending back to ca 1100 CE in four of their fourteen lakes, and beyond the limit of their records (ca 500 CE) in two.…”

Section: Lake Water Tp Concentrationsmentioning

confidence: 97%

“…By examining whole Holocene trends in lake nutrient dynamics, we also have an opportunity to identify the earliest human impacts on lake TP concentrations, as well as identifying the periods before any impact where the lakes may be considered pristine. Both inform the debate about levels of lake water TP consistent with "high ecological status", and are crucial for the reliable identification of water quality targets (Hübener et al, 2015).…”

Section: Lake Water Tp Concentrationsmentioning

confidence: 99%

“…The problem of how best to determine the nutrient concentrations expected in a lake with "minimal anthropogenic impairment" is reviewed by Hübener et al (2015). They compare widely applied empirical modelling approaches with palaeolimnological methods, and particularly consider the issue of how far back in time one must look to find minimal human impact.…”

Section: Lake Water Tp Concentrationsmentioning

confidence: 99%

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Towards a history of Holocene P dynamics for the northern hemisphere using lake sediment geochemical records

Moyle¹,

Boyle²,

Chiverrell³

2021

Preprint

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Abstract. Present day lake water phosphorus (P) enrichment and accelerated P cycling are changes superimposed on a dynamic Holocene history of landscape recovery from glaciation, changes in climate, and long-term low-intensity human activity. Knowledge of the history of long-term P dynamics is essential for understanding present-day landscape P export and for managing both terrestrial and aquatic environments. This study is the first attempt to constrain the timing and magnitude of terrestrial changes in Holocene P dynamics across the Northern Hemisphere using lake sediment records. Here we reconstruct trajectories in terrestrial Holocene P dynamics for the Northern Hemisphere. We apply a simple process model to published lake sediment geochemical P records from 24 sites, producing records of landscape P yield and reconstructing lake water total phosphorus (TP) concentrations. Individual site trajectories of landscape P yield and lake water TP vary systematically, with differences attributable to local landscape development history. Three distinct traits are apparent. Mountain sites with minimal direct human impact show falling P supply and conform to conceptual models of natural soil development (Trait 1). Lowland sites where substantial (pre-)historic agriculture was present show progressively increasing P supply (Trait 2). Lowland sites may also show a rapid acceleration in P supply over the last few centuries, where high intensity land use, including settlements and farming, are present (Trait 3). Where data availability permitted comparison, our reconstructed TP records agree well with both monitored lake water TP data and diatom inferred TP, and our sediment inferred P yields are comparable to reported catchment export coefficients. Our reconstructions form the first systematic assessment of average terrestrial P export for the Northern Hemisphere over the Holocene and provide the empirical data needed for constraining long-term landscape P cycling models and values for terrestrial P export that could be used for ocean P cycling models. The long-term perspective provided by our sediment-inferred TP can be used to identify pre-disturbance baselines for lake water quality, information essential to target-driven lake management. We find the first detectable anthropogenic impacts on P cycling ca. 6000 BP, with more substantial impacts as early as 3000 BP. Consequently, to characterise pre-disturbance lake P conditions at Trait 2 and Trait 3 sites it is necessary to consider time periods before the arrival of early farmers. Our use of trait classifications has a predictive power for sites without sediment records, allowing prediction of TP baselines and P trajectories based on regional landscape development history.

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Section: Lake Water Tp Concentrationssupporting

confidence: 85%

Section: Lake Water Tp Concentrationssupporting

confidence: 85%

Section: Lake Water Tp Concentrationsmentioning

confidence: 97%

Section: Lake Water Tp Concentrationsmentioning

confidence: 99%

Section: Lake Water Tp Concentrationsmentioning

confidence: 99%

See 3 more Smart Citations

Towards a history of Holocene P dynamics for the northern hemisphere using lake sediment geochemical records

Moyle¹,

Boyle²,

Chiverrell³

2021

Preprint

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Holocene lake phosphorus species and primary producers reflect catchment processes in a small, temperate lake

Klamt

Poulsen

Odgaard

et al. 2021

Ecological Monographs

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This paleolimnological study aims to investigate how natural processes and anthropogenic land‐use changes have affected sedimentary phosphorus (P) forms and primary producers in a small, temperate lake (Lake Fuglsø, Denmark) throughout the Holocene. Our multi‐proxy approach uses pollen, X‐ray fluorescence scanning, carbon (C) and nitrogen contents and stable isotopes, sequential P extraction, 31P nuclear magnetic resonance spectroscopy, pigments, diatoms, and plant macrofossils from a 14C‐dated sediment record. We found three periods of human impact: (1) low disturbance from domestic grazing during the early/mid Neolithic (~3600 to ~2600 BC), (2) higher disturbance because of animal husbandry and some grain cultivation during the Late Bronze and Pre‐Roman Iron Age (~800 BC to AD ~100), and (3) strong disturbance caused by domestic grazing, intensified crop cultivation and, in particular, by retting of fiber plants during the Middle Ages and Renaissance (AD ~1000 to ~1700). Cultural eutrophication during the latter phase caused unprecedented changes in the lake, including altered species composition, high production, and strongly accelerated sediment accumulation rates. Generally, catchment deforestation was related to elevated proportions of metal (iron, aluminum, calcium)‐bound P forms in the sediment, while high tree cover correlated with elevated proportions of P forms associated with organic material (“organic” P, humic‐bound P, refractory organic P) and loosely bound P. During phases with forest in the catchment, silicon (Si) inputs to the lake were insufficient and diatom frustules were mostly absent in the sediments. In contrast, diatoms thrived in the lake when the landscape was open and erosional Si influx was high. This study is the first to show long‐term (~eight millennia) and recurring Si limitation of diatoms, a finding that may explain the absence of diatoms in sediment records of other sites too. In summary, human land‐use with preceding deforestation accelerated the transport of nutrients and elements from the terrestrial to the aquatic environment, leading to substantial and irreversible changes in Lake Fuglsø. Our study is a good example of the tight links between catchment processes and lake status, indicating that catchment dynamics should be considered in lake restoration projects, particularly for lowland lakes with high catchment : lake area ratios.

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Use of seasonal epilithic diatom assemblages to evaluate ecological status in Irish lakes

Kennedy

Buckley

2021

Ecological Indicators

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Identifying reference conditions for dimictic north German lowland lakes: implications from paleoecological studies for implementing the EU-Water Framework Directive

Cited by 7 publications

References 38 publications

Towards a history of Holocene P dynamics for the northern hemisphere using lake sediment geochemical records

Towards a history of Holocene P dynamics for the northern hemisphere using lake sediment geochemical records

Holocene lake phosphorus species and primary producers reflect catchment processes in a small, temperate lake

Use of seasonal epilithic diatom assemblages to evaluate ecological status in Irish lakes

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