| publications-101 |
PEER REVIEWED ARTICLE |
2011 |
Dong, X. |
Nutrients exert a stronger control than climate on recent diatom communities in Esthwaite Water: evidence from monitoring and palaeolimnological records. |
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10.1111/j.1365-2427.2011.02670.x |
Uncategorized |
Uncategorized |
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Summary1.āA longāterm monitoring programme on phytoplankton and physicochemical characteristics of Esthwaite Water (England) that started in 1945 provides a rare opportunity to understand the effects of climate and nutrients on a lake ecosystem.2.āMonitoring records show that the lake experienced nutrient enrichment from the early 1970s, particularly after 1975, associated with inputs from a local sewage treatment plant, resulting in marked increases in concentration of soluble reactive phosphorus (SRP). Climatic variables, such as air temperature (AirT) and rainfall, exhibit high variability with increasing trends after 1975.3.āDiatom analyses of an integrated 210Pbādated lake sediment core from Esthwaite Water, covering the period from 1945 to 2004, showed that fossil diatoms exhibited distinct compositional change in response to nutrient enrichment.4.āRedundancy analysis (RDA) based on diatom and environmental data sets over the past 60āyears showed that the most important variables explaining diatom species composition were winter concentrations of SRP, followed by AirT, independently explaining 22% and 8% of the diatom variance, respectively.5.āAdditive models showed that winter SRP was the most important factor controlling the diatom assemblages for the whole monitoring period. AirT had little effect on the diatom assemblages when nutrient levels were low prior to 1975. With the increase in nutrient availability during the eutrophication phase after 1975, climate became more important in regulating the diatom community, although SRP was still the major controlling factor.6.āThe relative effects of climate and nutrients on diatom communities vary depending on the timescale. RDA and additive model revealed that climate contributed little to diatom dynamics at an annual or decadal scale.7.āThe combination of monitoring and palaeolimnological records employed here offers the opportunity to explore how nutrients and climate have affected a lake ecosystem over a range of timescales. This dual approach can potentially be extended to much longer timescales (e.g. centuries), where longāterm, reliable observational records exist. |
226273 |
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| publications-102 |
PEER REVIEWED ARTICLE |
2011 |
Carstensen, J. |
Connecting the dots: responses of coastal ecosystems to changing nutrient concentrations |
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10.1021/es202351y |
Data Management & Analytics |
Natural Water Bodies |
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No abstract available |
226273 |
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| publications-103 |
PEER REVIEWED ARTICLE |
2010 |
Borja, A. |
Medium and long-term recovery of estuarine and coastal ecosystems: patterns, rates and restoration effectiveness |
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10.1007/s12237-010-9347-5 |
Data Management & Analytics |
Uncategorized |
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No abstract available |
226273 |
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| publications-104 |
PEER REVIEWED ARTICLE |
2011 |
Steckbauer, A. |
Ecosystem impacts on hypoxia: thresholds of hypoxia and pathways to recovery |
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10.1088/1748-9326/6/2/025003 |
Uncategorized |
Uncategorized |
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No abstract available |
226273 |
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| publications-105 |
PEER REVIEWED ARTICLE |
2011 |
Jurgensone, I. |
Long-term changes and controlling factors of phytoplankton community in the Gulf of Riga (Baltic Sea) |
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10.1007/s12237-011-9402-x |
Uncategorized |
Natural Water Bodies |
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No abstract available |
226273 |
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| publications-106 |
PEER REVIEWED ARTICLE |
2011 |
Atkins, J.P. |
Management of the marine environment: Integrating ecosystem services and societal benefits with the DPSIR framework in a systems approach |
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10.1016/j.marpolbul.2010.12.012 |
Data Management & Analytics |
Natural Water Bodies |
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No abstract available |
226273 |
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| publications-107 |
PEER REVIEWED ARTICLE |
2012 |
Pascual, M. |
What are the costs and benefits of biodiversity recovery in a highly polluted estuary? |
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10.1016/j.watres.2011.10.053 |
Data Management & Analytics |
Natural Water Bodies |
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No abstract available |
226273 |
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| publications-108 |
PEER REVIEWED ARTICLE |
2010 |
Carstensen, J. |
Censored data regression: Statistical methods for analyzing Secchi transparency in shallow systems |
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10.4319/lom.2010.8.376 |
Data Management & Analytics |
Natural Water Bodies |
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Secchi depth monitoring in shallow ecosystems occasionally records sight to the bottom and thus the true Secchi depth is larger than the observed. In such cases Secchi depth data are censored. Despite that statistical methods for analyzing such censored data have existed for many decades and have been widely used in other disciplines, the censoring problem has been completely overlooked in aquatic ecology. Here, I have presented and exemplified a statistical regression technique (Censored Data Regression, CDR) that specifically addresses censored data, and compared resulting estimates of mean and standard error of Secchi depth distributions with those of statistical methods commonly applied in the literature. Standard methods increasingly underestimated both mean and standard error of Secchi depths as the proportion of censored data increased. Analysis of measured Secchi depths from four coastal sites in Denmark, representing 29% to 80% censored data, documented substantial biases in distribution means (up to 2 m), and standard errors (50 %) when censoring was not accounted for. This had significant repercussions for the estimation of trends and seasonal patterns of Secchi depths, in the worst case actually reporting no significant trend when a trend was actually present. Consequently, there is a need to introduce CDR as a more appropriate method for analyzing Secchi depths in shallow lakes and coastal ecosystems. More generally, the objective of this study was to raise the awareness of the censoring problem and to promote appropriate statistical methods for analyzing censored ecological data. |
226273 |
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| publications-109 |
PEER REVIEWED ARTICLE |
2011 |
Angeler, D.G. |
Revealing the Organization of Complex Adaptive Systems throughMultivariate Time Series Modeling |
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10.5751/es-04175-160305 |
Uncategorized |
Uncategorized |
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No abstract available |
226273 |
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| publications-110 |
PEER REVIEWED ARTICLE |
2010 |
Borja, A. |
Marine management ā towards an integrated implementation of the European Marine Strategy Framework and the Water Framework Directives |
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10.1016/j.marpolbul.2010.09.026 |
Uncategorized |
Natural Water Bodies |
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No abstract available |
226273 |
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