TY  - JOUR
A1  - Nwosu, Ebuka Canisius
A1  - Brauer, Achim
A1  - Kaiser, Jérôme
A1  - Horn, Fabian
A1  - Wagner, Dirk
A1  - Liebner, Susanne
T1  - Evaluating sedimentary DNA for tracing changes in cyanobacteria dynamics from sediments spanning the last 350 years of Lake Tiefer See, NE Germany
JF  - Journal of paleolimnology
N2  - Since the beginning of the Anthropocene, lacustrine biodiversity has been influenced by climate change and human activities. These factors advance the spread of harmful cyanobacteria in lakes around the world, which affects water quality and impairs the aquatic food chain. In this study, we assessed changes in cyanobacterial community dynamics via sedimentary DNA (sedaDNA) from well-dated lake sediments of Lake Tiefer See, which is part of the Klocksin Lake Chain spanning the last 350 years. Our diversity and community analysis revealed that cyanobacterial communities form clusters according to the presence or absence of varves. Based on distance-based redundancy and variation partitioning analyses (dbRDA and VPA) we identified that intensified lake circulation inferred from vegetation openness reconstructions, delta C-13 data (a proxy for varve preservation) and total nitrogen content were abiotic factors that significantly explained the variation in the reconstructed cyanobacterial community from Lake Tiefer See sediments. Operational taxonomic units (OTUs) assigned to Microcystis sp. and Aphanizomenon sp. were identified as potential eutrophication-driven taxa of growing importance since circa common era (ca. CE) 1920 till present. This result is corroborated by a cyanobacteria lipid biomarker analysis. Furthermore, we suggest that stronger lake circulation as indicated by non-varved sediments favoured the deposition of the non-photosynthetic cyanobacteria sister clade Sericytochromatia, whereas lake bottom anoxia as indicated by subrecent- and recent varves favoured the Melainabacteria in sediments. Our findings highlight the potential of high-resolution amplicon sequencing in investigating the dynamics of past cyanobacterial communities in lake sediments and show that lake circulation, anoxic conditions, and human-induced eutrophication are main factors explaining variations in the cyanobacteria community in Lake Tiefer See during the last 350 years.
KW  - Late Holocene
KW  - Methylheptadecanes
KW  - Varves
KW  - Anthropocene
KW  - Sericytochromatia
KW  - Melainabacteria
Y1  - 2021
U6  - https://doi.org/10.1007/s10933-021-00206-9
SN  - 0921-2728
SN  - 1573-0417
VL  - 66
IS  - 3
SP  - 279
EP  - 296
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Heger, Tina
A1  - Bernard-Verdier, Maud
A1  - Gessler, Arthur
A1  - Greenwood, Alex D.
A1  - Grossart, Hans-Peter
A1  - Hilker, Monika
A1  - Keinath, Silvia
A1  - Kowarik, Ingo
A1  - Küffer, Christoph
A1  - Marquard, Elisabeth
A1  - Mueller, Johannes
A1  - Niemeier, Stephanie
A1  - Onandia, Gabriela
A1  - Petermann, Jana S.
A1  - Rillig, Matthias C.
A1  - Rodel, Mark-Oliver
A1  - Saul, Wolf-Christian
A1  - Schittko, Conrad
A1  - Tockner, Klement
A1  - Joshi, Jasmin Radha
A1  - Jeschke, Jonathan M.
T1  - Towards an Integrative, Eco-Evolutionary Understanding of Ecological Novelty: Studying and Communicating Interlinked Effects of Global Change
JF  - Bioscience
N2  - Global change has complex eco-evolutionary consequences for organisms and ecosystems, but related concepts (e.g., novel ecosystems) do not cover their full range. Here we propose an umbrella concept of "ecological novelty" comprising (1) a site-specific and (2) an organism-centered, eco-evolutionary perspective. Under this umbrella, complementary options for studying and communicating effects of global change on organisms, ecosystems, and landscapes can be included in a toolbox. This allows researchers to address ecological novelty from different perspectives, e.g., by defining it based on (a) categorical or continuous measures, (b) reference conditions related to sites or organisms, and (c) types of human activities. We suggest striving for a descriptive, non-normative usage of the term "ecological novelty" in science. Normative evaluations and decisions about conservation policies or management are important, but require additional societal processes and engagement with multiple stakeholders.
KW  - Anthropocene
KW  - eco-evolutionary experience
KW  - global change
KW  - novel ecosystems
KW  - shifting baselines
Y1  - 2019
U6  - https://doi.org/10.1093/biosci/biz095
SN  - 0006-3568
SN  - 1525-3244
VL  - 69
IS  - 11
SP  - 888
EP  - 899
PB  - Oxford Univ. Press
CY  - Oxford
ER  -