Sonia Simard

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

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Martin Wilmking

Universität Greifswald

Ingo Heinrich

Deutsches Archäologisches Institut, Zentrale

Ernst van der Maaten

TU Dresden

Theresa Blume

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Allan Buras

Technical University of Munich

Gerhard Helle

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Tobias Scharnweber

Universität Greifswald

Marieke van der Maaten‐Theunissen

TU Dresden

Ingo Heidbüchel

Helmholtz Centre for Environmental Research

Andreas Güntner

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Cooperative Institutions

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Universität Greifswald

University of Potsdam

Swiss Federal Institute for Forest, Snow and Landscape Research

Université du Québec à Chicoutimi

University of Bern

Oeschger Centre for Climate Change Research

Centre National de la Recherche Scientifique

Potsdam Institute for Climate Impact Research

University of Arizona

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Integrative assessment of structures and processes: Recharge, flow systems and interactions in a forested groundwater dominated lake system

EGUGA (2014)

Theresa Blume Christina Tecklenburg Henriette Wilke Janek Dreibrodt Sonia Simard

Depression-focused recharge

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Tuning the Voices of a Choir: Detecting Ecological Gradients in Time-Series Populations

PLoS ONE (2016)

Allan Buras Marieke van der Maaten‐Theunissen Ernst van der Maaten Svenja Ahlgrimm Philipp Hermann

This paper introduces a new approach-the Principal Component Gradient Analysis (PCGA)-to detect ecological gradients in time-series populations, i.e. several time-series originating from different individuals of a population. Detection of ecological gradients is of particular importance when dealing with time-series from heterogeneous populations which express differing trends. PCGA makes use of polar coordinates of loadings from the first two axes obtained by principal component analysis (PCA) to define groups of similar trends. Based on the mean inter-series correlation (rbar) the gain of increasing a common underlying signal by PCGA groups is quantified using Monte Carlo Simulations. In terms of validation PCGA is compared to three other existing approaches. Focusing on dendrochronological examples, PCGA is shown to correctly determine population gradients and in particular cases to be advantageous over other considered methods. Furthermore, PCGA groups in each example allowed for enhancing the strength of a common underlying signal and comparably well as hierarchical cluster analysis. Our results indicate that PCGA potentially allows for a better understanding of mechanisms causing time-series population gradients as well as objectively enhancing the performance of climate transfer functions in dendroclimatology. While our examples highlight the relevance of PCGA to the field of dendrochronology, we believe that also other disciplines working with data of comparable structure may benefit from PCGA.

Similarity (geometry)

Dendroclimatology

10.1371/journal.pone.0158346

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Citations (56)

DendrometeR: analyzing the pulse of trees in R

EGUGA (2016)

Ernst van der Maaten Marieke van der Maaten‐Theunissen Marko Smiljanić Sergio Rossi Sonia Simard

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From process to proxy: Ecological challenges and opportunities of tree-ring based environmental reconstructions

EGUGA (2014)

Martin Wilmking Allan Buras Ingo Heinrich Tobias Scharnweber Sonia Simard

Proxy (statistics)

Tree (set theory)

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Dendrochronology and lakes: using tree-rings of alder to reconstruct lake levels

EGUGA (2014)

Ernst van der Maaten Allan Buras Tobias Scharnweber Sonia Simard Knut Kaiser

Tree (set theory)

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Tree-ring widths and isotopes of artificially defoliated balsam firs: A simulation of spruce budworm outbreaks in Eastern Canada

Environmental and Experimental Botany (2012)

Sonia Simard Hubert Morin Cornélia Krause William M. Buhay Kerstin Treydte

Tree (set theory)

10.1016/j.envexpbot.2012.02.012

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Citations (21)

Controls on tree water uptake and information storage in tree rings

EGUGA (2016)

Theresa Blume Sonia Simard Ingo Heidbüchel Andreas Güntner Ingo Heinrich

Tree (set theory)

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Carbon and oxygen stable isotopes from tree-rings to identify spruce budworm outbreaks in the boreal forest of Québec

Chemical Geology (2008)

Sonia Simard S. Elhani Hubert Morin Cornélia Krause Paolo Cherubini

Abies balsamea

Choristoneura fumiferana

10.1016/j.chemgeo.2008.01.018

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Citations (36)

Can We Use Tree Rings of Black Alder to Reconstruct Lake Levels? A Case Study for the Mecklenburg Lake District, Northeastern Germany

PLoS ONE (2015)

Ernst van der Maaten Marieke van der Maaten‐Theunissen Allan Buras Tobias Scharnweber Sonia Simard

In this study, we explore the potential to reconstruct lake-level (and groundwater) fluctuations from tree-ring chronologies of black alder (Alnus glutinosa L.) for three study lakes in the Mecklenburg Lake District, northeastern Germany. As gauging records for lakes in this region are generally short, long-term reconstructions of lake-level fluctuations could provide valuable information on past hydrological conditions, which, in turn, are useful to assess dynamics of climate and landscape evolution. We selected black alder as our study species as alder typically thrives as riparian vegetation along lakeshores. For the study lakes, we tested whether a regional signal in lake-level fluctuations and in the growth of alder exists that could be used for long-term regional hydrological reconstructions, but found that local (i.e. site-specific) signals in lake level and tree-ring chronologies prevailed. Hence, we built lake/groundwater-level reconstruction models for the three study lakes individually. Two sets of models were considered based on (1) local tree-ring series of black alder, and (2) site-specific Standardized Precipitation Evapotranspiration Indices (SPEI). Although the SPEI-based models performed statistically well, we critically reflect on the reliability of these reconstructions, as SPEI cannot account for human influence. Tree-ring based reconstruction models, on the other hand, performed poor. Combined, our results suggest that, for our study area, long-term regional reconstructions of lake-level fluctuations that consider both recent and ancient (e.g., archaeological) wood of black alder seem extremely challenging, if not impossible.

Alnus glutinosa

10.1371/journal.pone.0137054

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Citations (10)

Tree species specific soil moisture patterns and dynamics through the seasons

EGU General Assembly Conference Abstracts (2015)

Ingo Heidbüchel Janek Dreibrodt Sonia Simard Andreas Güntner Theresa Blume

Tree (set theory)

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