Nitrate‐depleted conditions on the increase in shallow northern  European lakes

Weyhenmeyer, Gesa A.; Jeppesen, Erik; Adrian, Rita; Арвола, Лаури; Blenckner, Thorsten; Jankowski, Thomas; Jennings, Eleanor; Nõges, Peeter; Nõges, Tiina; Straile, Dietmar

doi:10.4319/lo.2007.52.4.1346

Cited by 65 publications

(54 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The co-decrease in N and P was most likely due to successful management of both point and non-point nutrient sources in Danish catchments [64,65] rather than internal dynamics subsequently resulting in potential N accumulation [66]. Furthermore, the majority of the lakes in the present study were shallow and small with short residence times, which might have facilitated stronger N removal [5,67].…”

Section: Discussionmentioning

confidence: 87%

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Özkan

Davidson

Bjerring

et al. 2016

Water

Self Cite

View full text Add to dashboard Cite

A two-decade (1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008) time series of lake phyto-and zooplankton, water characteristics and climate in 17 Danish lakes was analysed to examine the long term changes and the effects of lake restoration efforts. The analyses of the pair-wise correlations across time series revealed a strong synchrony in climatic variables among the lakes. A significant, but weak increase in air temperature was observed and resulted in a corresponding increase in surface water temperature only in summer. Lake physico-chemical variables had weaker synchrony than climatic variables. Synchrony in water temperature and stratification was stronger than lake chemistry as the former is mostly affected by atmospheric energy flux. Synchrony in the taxonomic richness of the plankton groups and phytoplankton biomass was apparent, to a similar degree as observed for lake chemistry. The synchrony and the temporal trends in lake chemistry and plankton were more pronounced for the lakes with strong re-oligotrophication. Phytoplankton biomass decreased and plankton richness increased in these lakes, with a shift from Chlorophyta dominance towards more heterogeneous phytoplankton communities. Notably, a widespread significant positive trend in plankton richness was observed not only in lakes with strong re-oligotrophication but across all lakes. The widespread increase in plankton richness coincided with widespread decrease in phosphate and total nitrogen concentrations, as well as with the trends in climate indicating a likely joint effect of nutrient reduction and climate in driving lake plankton. However, temporal changes and synchrony as well as the recovery of richness and composition of lake plankton more coherently corresponded with the nutrient loading reduction across the Danish landscape, while the role of climate control of the lake plankton was less pronounced.

show abstract

Section: Discussionmentioning

confidence: 87%

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Özkan

Davidson

Bjerring

et al. 2016

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pattern of withinlake loss rates among lakes (Fig. 3) was related to mean depth and is likely the result of processes that regulate similar seasonal patterns of nitrate loss in European lakes (Weyhenmeyer et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen deposition and lake nitrogen concentrations: a regional analysis of terrestrial controls and aquatic linkages

et al. 2012

View full text Add to dashboard Cite

Abstract. Loading of nutrients from terrestrial ecosystems strongly influences the productivity and biogeochemistry of aquatic ecosystems. Human activities can supplement and even dominate nutrient loading to many lakes, particularly in agricultural and urbanized settings. For lakes in more remote regions such as the Adirondack Mountains of New York, N deposition represents the primary potential anthropogenic nutrient source. We combined a spatial model of N deposition with data on lake-N concentrations and spatial data on watershed configuration to identify the sources of watershed N loading for over 250 lakes in the Adirondacks. The analysis indicates that while wetlands are stronger sources of N loading per unit area than forests in the absence of inorganic N deposition, wetlands retain essentially all N deposition, while forests retained ;87% of N deposition. Since forests cover close to 90% of the watersheds, upland forests are, on average, the single largest source of N loading to Adirondack lakes. Direct deposition of N to the lake surface accounted for as large a fraction of loading as that from wetlands in the watersheds. We found no evidence that presence of wetlands along flowpaths to lakes reduced loading from upland forests. Moreover, there was no evidence that net loading to lakes declined with increasing distance of a source area to the lake. Lake N-concentrations thus primarily reflect N-loading from forests in concert with loss rates determined by water residence time and within-lake processes.

show abstract

“…The potential impacts of these changes will be both direct and indirect and may include reduced transparency of water and increased frequency and severity of algal blooms (e.g. Elliot et al 2006;Weyhenmeyer et al 2007;Naden et al in press).…”

Section: System Changementioning

confidence: 99%

The Role of Palaeolimnology in Implementing the Water Framework Directive in Ireland

Dalton¹,

Taylor²,

Jennings³

2009

Biology & Environment: Proceedings of the Royal Irish Acade

View full text Add to dashboard Cite

The EU Water Framework Directive has created research opportunities and challenges for water-quality managers and palaeolimnologists alike. Opportunities have arisen through increased attention to water-quality issues, and these in turn have led to enhanced funding for palaeolimnological research. Scientifi c challenges include identifying aquatic-system pressures, assessing risks, defi ning non-impacted reference conditions and developing new indicator and classifi cation systems. These challenges have provided the aquatic science research communities with a range of highly relevant and urgent research questions. Addressing these questions requires a collaborative, systematic, whole-catchment approach that, in addition to palaeolimnologists, involves modellers and scientists from other disciplines, water-quality managers, policy-makers and the general public.

show abstract

Nitrate‐depleted conditions on the increase in shallow northern European lakes

Cited by 65 publications

References 29 publications

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Nitrogen deposition and lake nitrogen concentrations: a regional analysis of terrestrial controls and aquatic linkages

The Role of Palaeolimnology in Implementing the Water Framework Directive in Ireland

Contact Info

Product

Resources

About