Using diatoms to assess the impacts of prehistoric, pre-industrial and modern land-use on Danish lakes

Bradshaw, Emily G.; Nielsen, Anne Birgitte; Anderson, N. J.

doi:10.1007/s10113-005-0007-4

Cited by 52 publications

(23 citation statements)

References 19 publications

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“…Although there are an increasing number of examples of lakes set in rich agricultural landscapes that have experienced enrichment as a result of human activity from as far back as the Bronze Age (e.g. Fritz, 1989; Bradshaw, Nielsen & Anderson, 2006; Dressler et al. , 2011) and even the early Holocene (Vigliotti et al.…”

Section: Extending the Temporal Range Of Observational Time Seriesmentioning

confidence: 99%

Combining limnological and palaeolimnological data to disentangle the effects of nutrient pollution and climate change on lake ecosystems: problems and potential

et al. 2012

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Summary 1. As long‐term observational lake records continue to lengthen, the historical overlap with lake sediment records grows, providing increasing opportunities for placing the contemporary ecological status of lakes in a temporal perspective. 2. Comparisons between long‐term data sets and sediment records, however, require lake sediments to be accurately dated and for sediment accumulation rates to be sufficiently rapid to allow precise matching with observational data. 3. The critical role of the sediment record in this context is its value in tracking the changing impact of human activity on a lake from a pre‐disturbance reference through to the present day. 4. Here, we use data from a range of lakes across Europe presented as case studies in this Special Section. The seven sites considered all possess both long‐term observational records and high‐quality sediment records. Our objective is to assess whether recent climate change is having an impact on their trophic status and in particular whether that impact can be disentangled from the changes associated with nutrient pollution. 5. The palaeo‐data show clear evidence for the beginning of nutrient pollution varying from the mid‐nineteenth century at Loch Leven to the early and middle twentieth century at other sites. The monitoring data show different degrees of recovery when judged against the palaeo‐reference. 6. The reason for limited recovery is attributed to continuing high nutrient concentrations related to an increase in diffuse nutrient loading or to internal P recycling, but there is some evidence that climate change may be playing a role in offsetting recovery at some sites. If this is the case, then lake ecosystems suffering from eutrophication may not necessarily return to their pre‐eutrophication reference status despite the measures that have been taken to reduce external nutrient loading. 7. The extent to which future warming might further limit such recovery can be evaluated only by continued monitoring combined with the use of palaeo‐records that set the pre‐eutrophication reference.

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Section: Extending the Temporal Range Of Observational Time Seriesmentioning

confidence: 99%

Combining limnological and palaeolimnological data to disentangle the effects of nutrient pollution and climate change on lake ecosystems: problems and potential

et al. 2012

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“…Physical, chemical and biological indicators preserved in lake sediments offer insight into environmental conditions and variability through time (Smol, 2008). One such technique, the so-called "top and bottom" or "before and after" approach, provides a snapshot of lakewater conditions by examining two discrete points in time within the sedimentary record: the top 0.5-cm interval (representing modern or present-day lake conditions) and the bottom 0.5-cm interval of sediment cores (representing pre-disturbance or pre-1850s reference conditions) (e.g., Bradshaw et al, 2006;Cumming et al, 1992;Dixit and Smol, 1994;Dixit et al, 1999;Ginn et al, 2007;Hall and Smol, 1996;Harris et al, 2006;Rühland et al, 2003). Here, we apply the top-bottom paleolimnological approach to a regional-scale assessment of modern and historical water quality and ecological changes in the LoW.…”

Section: Introductionmentioning

confidence: 99%

Examining 20th century water quality and ecological changes in the Lake of the Woods, Ontario, Canada: A paleolimnological investigation

Hyatt

Paterson

Rühland

et al. 2011

Journal of Great Lakes Research

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“…Anthropogenic impact has increased the magnitude and speed of change in freshwater ecosystems deteriorating the water quality drastically. Although humans have affected water quality of lakes for thousands of years (e.g., Renberg, 1990;Bradshaw et al, 2006;Räsänen et al, 2006;Guilizzoni et al, 2011), the most distinctive and intensive changes have happened since ca. 1850 after the period of major industrialization and increased agricultural activities (e.g., Bennion et al, 2004; and at ca.…”

Section: Introductionmentioning

confidence: 99%

Responses of Aquatic Ecosystems to Environmental Changes in Finland and China

Weckström

Liao

et al. 2015

Front. Ecol. Evol.

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The concern for the state of global freshwater reservoirs has increased due to deterioration of the water quality during the last decades. This has prompted monitoring and restoration efforts such as the European Water Framework Directive and the national-scale 2nd-investigation and monitoring of the water quality, water volume and biota resources in China. The challenge so far has been the determination of the "natural" state (reference conditions) of freshwater ecosystems. We used the sediment archives of five lakes and one brackish water embayment in Finland and China to assess the impact of selected variables of climatology, hydrology, nutrients, and changes in human population on these ecosystems during the last few centuries. The study sites represent catchment areas with varying land use. Despite the long distance between the sites and their different land-use characteristics, the direction and timing of changes during the last few centuries are well comparable between the high latitudes of Finland and the mid-low latitudes of China. This study reinforces the sensitivity of aquatic ecosystems to environmental change and underlines the usefulness of the palaeolimnological approach as a tool for determining reference conditions.

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Using diatoms to assess the impacts of prehistoric, pre-industrial and modern land-use on Danish lakes

Cited by 52 publications

References 19 publications

Combining limnological and palaeolimnological data to disentangle the effects of nutrient pollution and climate change on lake ecosystems: problems and potential

Combining limnological and palaeolimnological data to disentangle the effects of nutrient pollution and climate change on lake ecosystems: problems and potential

Examining 20th century water quality and ecological changes in the Lake of the Woods, Ontario, Canada: A paleolimnological investigation

Responses of Aquatic Ecosystems to Environmental Changes in Finland and China

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