ORCID Profile
0000-0003-2326-1564
Current Organisation
Aarhus Universitet
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Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 04-2017
DOI: 10.1016/J.SCITOTENV.2017.01.118
Abstract: Understanding the dynamics of ecosystem services (ESs) is crucial for sustainable resource management. Palaeolimnological records have a great potential to reveal long-term variations and dynamic interactions in ESs, especially supporting/regulating services, which are not easily quantified by documentary records. To elucidate the variations between eight important ESs in shallow lake ecosystems, we combined documentary records with palaeolimnological proxies (covering the past 100years) from two typical lakes (Lakes Taibai and Zhangdu) of the Yangtze River basin. Although all supporting services and some provisioning services have increased, the regulating services of the two lakes have markedly declined, in particular since the 1950s. Human activities, including hydrological intervention, nutrient input and land-use change, were identified as the main factors behind the observed variations. Both in Lake Taibai and Zhangdu, primary production and bio ersity (supporting services) have increased (synergies), whereas climate and water purification (regulating services) have significantly decreased (tradeoffs) since the 1950s when attempts were made by the local population to reach a higher land/fish ESs level. By considering long-term records, dynamic tradeoff and synergy relationship between various ESs relative to different types of human "modification" in a temporal perspective, we suggest valuable information can be gained in future lake management initiatives.
Publisher: Springer Science and Business Media LLC
Date: 11-2013
Publisher: Springer Science and Business Media LLC
Date: 03-2013
Publisher: Research Square Platform LLC
Date: 11-08-2023
DOI: 10.21203/RS.3.RS-3128317/V1
Abstract: Aquatic ecosystems are threatened by eutrophication from nutrient pollution1. In lakes, eutrophication causes a plethora of deleterious effects, such as harmful algal blooms, fish kills2 and increased methane emissions3. However, lake-specific responses to nutrient changes are highly variable, complicating eutrophication management4. These lake-specific responses could result from short-term stochastic drivers overshadowing lake-independent, long-term relationships between phytoplankton and nutrients5. Here we show that strong stoichiometric relationships exist between nutrients and chlorophyll a (Chla) for 5-year simple moving averages (SMAs, median R² = 0.87) along a gradient of total nitrogen to total phosphorus (TN : TP) ratios. These stoichiometric relationships are consistent across 159 shallow lakes from a cross-continental, open-access database. We calculated 5-year SMA residuals to assess short-term variability and found substantial short-term Chla variation which was weakly related to nutrient concentrations (median R² = 0.12). Our findings are robust and broadly relevant. We found consistent statistical estimates based on a rigorous bootstrap approach and included all data from lakes under six meters average depth, a category that includes 89% of global lakes. These stoichiometric long-term relationships can improve quantitative nutrient management in lakes and their catchments through a nutrient-ratio-based strategy.
Publisher: Springer Science and Business Media LLC
Date: 08-06-2018
No related grants have been discovered for Thomas Davidson.