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6. A systemic overreaction to years versus decades of warming in a subarctic grassland ecosystem.

Author

Walker, Tom WN, Janssens, Ivan A, Weedon, James T, Sigurdsson, Bjarni D, Richter, Andreas, Peñuelas, Josep, Leblans, Niki IW, Bahn, Michael, Bartrons, Mireia, De Jonge, Cindy, Fuchslueger, Lucia, Gargallo-Garriga, Albert, Gunnarsdóttir, Gunnhildur E, Marañón-Jiménez, Sara, Oddsdóttir, Edda S, Ostonen, Ivika, Poeplau, Christopher, Prommer, Judith, Radujković, Dajana, Sardans, Jordi, Sigurðsson, Páll, Soong, Jennifer L, Vicca, Sara, Wallander, Håkan, Ilieva-Makulec, Krassimira, and Verbruggen, Erik

Subjects
Soil, Ecosystem, Climate Change, Carbon Cycle, Grassland
Abstract

Temperature governs most biotic processes, yet we know little about how warming affects whole ecosystems. Here we examined the responses of 128 components of a subarctic grassland to either 5-8 or >50 years of soil warming. Warming of >50 years drove the ecosystem to a new steady state possessing a distinct biotic composition and reduced species richness, biomass and soil organic matter. However, the warmed state was preceded by an overreaction to warming, which was related to organism physiology and was evident after 5-8 years. Ignoring this overreaction yielded errors of >100% for 83 variables when predicting their responses to a realistic warming scenario of 1 °C over 50 years, although some, including soil carbon content, remained stable after 5-8 years. This study challenges long-term ecosystem predictions made from short-term observations, and provides a framework for characterization of ecosystem responses to sustained climate change.

Published
2020

10. Using biomarker lipids to reconstruct soil fertility through time

Author

De Jonge, Cindy, primary, Guo, Jing jing, additional, Hällberg, Petter, additional, Griepentrog, Marco, additional, Rifai, Hamdi, additional, Richter, Andreas, additional, Ramirez, Edson, additional, Zhang, Xinbao, additional, Smittenberg, Rienk, additional, Peterse, Francien, additional, Boeckx, Pascal, additional, and Dercon, Gerd, additional

Published
2024
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11. Interlaboratory Comparison of Branched GDGT Temperature and pH Proxies Using Soils and Lipid Extracts

Author

De Jonge, Cindy, Peterse, Francien, Nierop, Klaas G.J., Blattmann, Thomas M., Alexandre, Marcelo, Ansanay-Alex, Salome, Austin, Thomas, Babin, Mathieu, Bard, Edouard, Bauersachs, Thorsten, Blewett, Jerome, Boehman, Brenna, Castañeda, Isla S., Chen, Junhui, Conti, Martina L.G., Contreras, Sergio, Cordes, Julia, Davtian, Nina, van Dongen, Bart, Duncan, Bella, Elling, Felix J., Galy, Valier, Gao, Shaopeng, Hefter, Jens, Hinrichs, Kai Uwe, Helling, Mitchell R., Hoorweg, Mariska, Hopmans, Ellen, Hou, Juzhi, Huang, Yongsong, Huguet, Arnaud, Jia, Guodong, Karger, Cornelia, Keely, Brendan J., Kusch, Stephanie, Li, Hui, Liang, Jie, Lipp, Julius S., Liu, Weiguo, Lu, Hongxuan, Mangelsdorf, Kai, Manners, Hayley, Martinez Garcia, Alfredo, Menot, Guillemette, Mollenhauer, Gesine, Naafs, B. David A., Naeher, Sebastian, O'Connor, Lauren K., Pearce, Ethan M., Pearson, Ann, Rao, Zhiguo, Rodrigo-Gámiz, Marta, Rosendahl, Chris, Rostek, Frauke, Bao, Rui, Sanyal, Prasanta, Schubotz, Florence, Scott, Wesley, Sen, Rahul, Sluijs, Appy, Smittenberg, Rienk, Stefanescu, Ioana, Sun, Jia, Sutton, Paul, Tierney, Jess, Tejos, Eduardo, Villanueva, Joan, Wang, Huanye, Werne, Josef, Yamamoto, Masanobu, Yang, Huan, Zhou, Aifeng, De Jonge, Cindy, Peterse, Francien, Nierop, Klaas G.J., Blattmann, Thomas M., Alexandre, Marcelo, Ansanay-Alex, Salome, Austin, Thomas, Babin, Mathieu, Bard, Edouard, Bauersachs, Thorsten, Blewett, Jerome, Boehman, Brenna, Castañeda, Isla S., Chen, Junhui, Conti, Martina L.G., Contreras, Sergio, Cordes, Julia, Davtian, Nina, van Dongen, Bart, Duncan, Bella, Elling, Felix J., Galy, Valier, Gao, Shaopeng, Hefter, Jens, Hinrichs, Kai Uwe, Helling, Mitchell R., Hoorweg, Mariska, Hopmans, Ellen, Hou, Juzhi, Huang, Yongsong, Huguet, Arnaud, Jia, Guodong, Karger, Cornelia, Keely, Brendan J., Kusch, Stephanie, Li, Hui, Liang, Jie, Lipp, Julius S., Liu, Weiguo, Lu, Hongxuan, Mangelsdorf, Kai, Manners, Hayley, Martinez Garcia, Alfredo, Menot, Guillemette, Mollenhauer, Gesine, Naafs, B. David A., Naeher, Sebastian, O'Connor, Lauren K., Pearce, Ethan M., Pearson, Ann, Rao, Zhiguo, Rodrigo-Gámiz, Marta, Rosendahl, Chris, Rostek, Frauke, Bao, Rui, Sanyal, Prasanta, Schubotz, Florence, Scott, Wesley, Sen, Rahul, Sluijs, Appy, Smittenberg, Rienk, Stefanescu, Ioana, Sun, Jia, Sutton, Paul, Tierney, Jess, Tejos, Eduardo, Villanueva, Joan, Wang, Huanye, Werne, Josef, Yamamoto, Masanobu, Yang, Huan, and Zhou, Aifeng

Abstract

Ratios of glycerol dialkyl glycerol tetraethers (GDGT), which are membrane lipids of bacteria and archaea, are at the base of several paleoenvironmental proxies. They are frequently applied to soils as well as lake- and marine sediments to generate records of past temperature and soil pH. To derive meaningful environmental information from these reconstructions, high analytical reproducibility is required. Based on submitted results by 39 laboratories from across the world, which employ a diverse range of analytical and quantification methods, we explored the reproducibility of brGDGT-based proxies (MBT′5ME, IR, and #ringstetra) measured on four soil samples and four soil lipid extracts. Correct identification and integration of 5- and 6-methyl brGDGTs is a prerequisite for the robust calculation of proxy values, but this can be challenging as indicated by the large inter-interlaboratory variation. The exclusion of statistical outliers improves the reproducibility, where the remaining uncertainty translates into a temperature offset from median proxy values of 0.3–0.9°C and a pH offset of 0.05–0.3. There is no apparent systematic impact of the extraction method and sample preparation steps on the brGDGT ratios. Although reported GDGT concentrations are generally consistent within laboratories, they vary greatly between laboratories. This large variability in brGDGT quantification may relate to variations in ionization efficiency or specific mass spectrometer settings possibly impacting the response of brGDGTs masses relative to that of the internal standard used. While ratio values of GDGT are generally comparable, quantities can currently not be compared between laboratories.

Published
2024

14. The impact of soil chemistry, moisture and temperature on branched and isoprenoid GDGTs in soils: a study using six globally distributed elevation transects

Author

De Jonge, Cindy, primary, Guo, Jingjing, additional, Hällberg, Petter, additional, Griepentrog, Marco, additional, Rifai, Hamdi, additional, Richter, Andreas, additional, Ramirez, Edson, additional, Zhang, Xinbao, additional, Smittenberg, Rienk H., additional, Peterse, Francien, additional, Boeckx, Pascal, additional, and Dercon, Gerd, additional

Published
2023
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33. A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia

Author

Bittner, Lucas, De Jonge, Cindy, Gil-Romera, Graciela, Lamb, Henry F., Russell, James M., Zech, Michael, Bittner, Lucas, De Jonge, Cindy, Gil-Romera, Graciela, Lamb, Henry F., Russell, James M., and Zech, Michael

Abstract

Eastern Africa has experienced strong climatic changes since the last deglaciation (15 000 years ago). The driving mechanisms and teleconnections of these spatially complex climate variations are yet not fully understood. Although previous studies on lake systems have enhanced our knowledge of Holocene precipitation variation in eastern Africa, relatively few studies have reconstructed the terrestrial temperature history of eastern Africa from lake archives. Here, we present (i) a new branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration that includes Bale Mountains surface sediments and (ii) a quantitative record of mean annual air temperature (MAT) over the past 12 ka cal BP using brGDGTs in a sediment core collected from Garba Guracha (3950ma.s.l.) in the Bale Mountains. After adding Bale Mountains surface sediment (n = 11) data (Baxter et al., 2019) to the existing East African lake dataset, additional variation in 6-methyl brGDGTs was observed, which necessitated modifying the MBT'5ME calibration (MBT denotes methylation of branched tetraethers) by adding 6-methyl brGDGT IIIa0 (resulting in the MBT Bale Mountains index, r² = 0:93, p < 0:05). Comparing the MBT'5ME and the new MBT Bale Mountains index, our high-altitude Garba Guracha temperature record shows that warming occurred shortly after the Holocene onset when the temperature increased by more than 3.0°C in less than 600 years. The highest temperatures prevailed between 9 and 6 ka cal BP, followed by a temperature decrease until 1.4 ka cal BP. The reconstructed temperature history is linked to supraregional climatic changes associated with insolation forcing and the African Humid Period (AHP), as well as with local anomalies associated with catchment deglaciation and hydrology.

Published
2022

40. Book of Abstracts - vDEUQUA2021

Author

Abadi, Mehrdad, Abbasi, Hamidreza, Abd El-Raouf, Amr, Abdulkarim, Mubarak, Adolph, Marie-Luise, Aeschbach, Werner, Akçar, Naki, Amini, Hamideh, Andreev, Andrej, Anselmetti, Flavio S., Aumaître, Georges, Avendaño Villeda, Diana, Bartz, Melanie, Baumhauer, Roland, Bazarradnaa, Enkhtuya, Bebiolka, Anke, Behling, Hermann, Benkaddour, Abdelfattah, Binot, Franz, Birlo, Stella, Bittner, Lucas, Bliedtner, Marcel, Bolland, Alexander, Bork, Hans-Rudolf, Bouaziz, Moncef, Bourlès, Didier, Brauer, Achim, Breuer, Sonja, Bromm, Tobias, Buechi, Marius W., Burghardt, Diana, Busch, Robert, Caballero, Margarita, Carr, Andrew S., Chapkanski, Stoil, Christl, Marcus, Cosac, Marian, Dal Corso, Marta, Daniel, Thomas, Dar, Reyaz, Dave, Aditi Krishna, De Jonge, Cindy, Deplazes, Gaudenz, Dietze, Elisabeth, Dietze, Michael, Dietzel, Martin, Dreibrodt, Stefan, Drysdale, Russell, du Plessis, Nadia, Dubois, Nathalie, Duller, Geoff, Duttmann, Rainer, Duval, Mathieu, Döhlert-Albani, Norman, Egli, Markus, Einwögerer, Thomas, Elbracht, Jörg, Enters, Dirk, Enzel, Yehouda, Ertlen, Damien, Farkas, Beáta, Fattahi, Morteza, Faust, Dominik, Faybishenko, Boris, Feistmantl, Nina, Fernandez, Philippe, Ferrier, Catherine, Fiedler, Sabine, Fischer, Birgit, Fischer, Peter, Fitzsimmons, Kathryn, Fletcher, William, Frechen, Manfred, Fuchs, Margret C., Fuchs, Markus, Fuelling, Alexander, Fábián, Szabolcs, Fülling, Alexander, Garbe, Philipp, Gebhardt, Catalina, Gegg, Lukas, Geis, Anna-Lena, Geitner, Clemens, Ghanbarian, Behzad, Gianotti, Franco, Gil Romera, Graciela, Glaser, Bruno, Glückler, Ramesh, Gresina, Fruzsina, Grootes, Pieter Meiert, Guadelli, Aleta, Guadelli, Jean-Luc, Guérin, Guillaume, Haas, Jean Nicolas, Haberzettl, Torsten, Hambach, Ulrich, Hardt, Jacob, Hein, Michael, Heinrich, Hartmut, Heinrich, Susann, Herzschuh, Ulrike, Heydari, Maryam, Hildebrandt, Dominic, Hirschmann, Philip, Hofmann, Felix Martin, Hofmann, Robert, Hogrefe, Ines, Huang, Jyh-Jaan Steven, Hunt, Allen, Händel, Marc, Ivy-Ochs, Susan, Jary, Zdzisław, Jeanneret, Pilar, Jöris, Olaf, Kalicki, Tomasz, Kamleitner, Sarah, Karaschewski, Jasmin, Keddadouche, Karim, Kehl, Martin, Kern, Zoltán, Kertscher, Cathleen, Khatooni, Darvish, Khosravichenar, Azra, Kipfer, Rolf, Kirchner, André, Kirleis, Wiebke, Klaes, Björn, Knitter, Daniel, Kolb, Thomas, Konstantinovski Puntos, Cyryl, Kreienbrink, Frauke, Kreutzer, Sebastian, Kulongoski, Justin, Laag, Christian, Labahn, Jakob, Lachner, Johannes, Lak, Razyeh, Lamb, Henry F., Lampe, Reinhard, Lang, Jörg, Lange-Athinodorou, Eva, Lauer, Tobias, Leanni, Laetitia, Leblanc, Jean-Claude, Lee, An-Sheng, Lehmkuhl, Frank, Lempe, Bernhard, Lerch, Marcel, Liou, Sofia Ya Hsuan, Lisa, Lenka, Liu, Zuorui, Lomax, Johanna, Lorenz, Sebastian, Lozano García, Socorro, Madarász, Balázs, Madritsch, Herfried, Maier, Andreas, Mangelsdorf, Kai, Markovic, Slobodan, Martinez Abarca, Luis Rodrigo, Marx, Samuel, May, Jan-Hendrik, Mayr, Christoph, Meister, Julia, Merchel, Silke, Meszner, Sascha, Meyer, Juliane, Mikdad, Abdeslam, Milevski, Ivica, Mir, Jehangeer, Mischke, Steffen, Mohammadi, Ali, Monegato, Giovanni, Moreiras, Stella, Mueller, Daniela, Muratoreanu, George, Müller, Daniela, Müller, Johannes, Nadeau, Marie-Josée, Nett, Janina, Neugebauer, Ina, Ng, Jessica, Nill, Leon, Nir, Nadav, Ohlendorf, Christian, Opp, Christian, Orgeira, Maria, Ortega Guerrero, Beatriz, Pasda, Clemens, Pasda, Kerstin, Penkman, Kirsty, Peric, Zoran, Pichat, Sylvain, Piller, Werner, Polgar, Irene, Prendergast, Amy, Preusser, Frank, Prud'homme, Charlotte, Pötter, Stephan, Quick, Lynne J., Rambeau, Claire, Reichert, Markus, Reimann, Tony, Reiss, Lilian, Roettig, Christopher-Bastian, Rolf, Christian, Russell, James, Ruszkiczay-Rüdiger, Zsófia, Ryzner, Kamila, Sahakyan, Lilit, Salazar, Gary, Salomon, Ferréol, Sardar Abadi, Mehrdad, Sarı, Selma, Scardia, Giancarlo, Schiestl, Robert, Schimmelpfennig, Irene, Schirmer, Wolfgang, Schmidt, Christoph, Schmidt, Johannes, Schmitt, Laurent, Schneider, Birgit, Schulte, Philipp, Schulze, Tabea, Schunke, Torsten, Schwab, Markus J., Schwahn, Lea, Schwamborn, Georg, Schwark, Lorenz, Schäfer, Dieter, Schütt, Brigitta, Seltzer, Alan, Selzer, Johnnes, Severinghaus, Jeffrey, Shah, Rayees, Simon, Ulrich, Sirakov, Nikolay, Sirakova, Svoboda, Sontag-González, Mariana, Sprafke, Tobias, Stahlschmidt, Mareike, Stauber, Theresa, Steier, Peter, Steiner, Martin, Stojakowits, Philipp, Strobel, Paul, Stroessner, Kathrin, Struck, Julian, Stute, Martin, Stutzriemer, Marika, Stäuble, Harald, Szidat, Sönke, Taneva, Stanimira, Tanner, David, ASTER, Team, Temovski, Marjan, Tinapp, Christian, Tjallingii, Rik, Trappe, Julian, Tylmann, Wojciech, Ulfers, Arne, Ullmann, Tobias, Urban, Brigitte, van Meer, Mike, Varga, György, Veres, Daniel, Verstraeten, Gert, Videiko, Michail, Vinnepand, Mathias, Vockenhuber, Christof, Vogel, Hendrik, Voigt, Silke, von Suchodoletz, Hans, Vött, Andreas, Weiß, Marcel, Werther, Lukas, Wolf, Daniel, Wonik, Thomas, Wrozyna, Claudia, Wunderlich, Tina, Zech, Michael, Zech, Roland, Zeeden, Christian, Zielhofer, Christoph, Zolitschka, Bernd, Zöller, Ludwig, Żurek, Krzysztof, von Suchodoletz, Hans, Dietze, Elisabeth, Dietze, Michael, Meister, Julia, Wrozyna, Claudia, Zeeden, Christian, Kreutzer, Sebastian, and Hildebrandt, Dominic

Subjects
Quaternary, Conference abstracts, Geoscience
Abstract

Collection of conference abstracts presented at the vDEUQUA2021 (2021-09-30 to 2021-09-01), the virtual meeting of the German Quaternary Association (DEUQUA).

Published
2021
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41. Revisiting Lake Garba Guracha, high altitude lake in the Bale Mountains, Ethiopia: reconstructing Late Glacial - Holocene lake level history using δ2H/δ18O biomarker analyses

Author

Bittner, Lucas, Bliedtner, Marcel, Grady, Dai, Gil-Romera, Graciela, Martin-Jones, Catherine, Lemma, Bruk, Lamp, Henry F., De Jonge, Cindy, Meyer, Hanno, Glaser, Bruno, and Zech, Michael

Abstract

Our knowledge of East African paleoclimate is largely based on marine core and paleolimnological reconstructions. Accordingly, more humid climatic conditions such as the African Humid Period (AHP) are usually associated with summer insolation-driven increased monsoonal precipitation and the movement of the Congo Air Boundary. In order to contribute to this discussion and to reconstruct the paleoclimate of the afro-alpine Bale Mountains, Ethiopia, within the DFG Research Unit 2358 ‘The Mountain Exile Hypothesis: How humans benefited from and re-shaped African high-altitude ecosystems during Quaternary climate changes’ we re-cored Lake Garba Guracha. This site represents one of the best dated Late Glacial - Holocene continuous, high altitude (3950 m asl) paleoenvironmental archives in East Africa. We investigated sugar and lipid biomarkers and their compound-specific stable oxygen and hydrogen isotopic composition (δ18Osugar and δ2Hn-alkane) to infer past hydrological patterns. The δ18Osugar record reflects lake water and can thus be used to reconstruct lake evaporation history. Our results suggest that a virtually permanent lake overflow existed from about 10 to 7 cal. ka BP, whereas the period from about 7 to 5 cal. ka BP is characterised by increased lake evaporation. We present initial results of δ18Odiatom analyses and organic geochemical and XRF data that document dominant minerogenic input during the Late Glacial and increased input of almost exclusively aquatic organic matter from 11 cal. ka BP on. Reconstructed mean annual temperatures (n=20, -2.2 to 2.5°C), inferred from brGDGT-based proxies, indicate that colder conditions prevailed in the high-altitude Bale Mountain ecosystem during the Younger Dryas., EGUsphere

Published
2020

45. Revisiting Lake Garba Guracha, high altitude lake in the Bale Mountains, Ethiopia: reconstructing Late Glacial – Holocene lake level history using δ2H/δ18O biomarker analyses

Author

Bittner, Lucas, primary, Bliedtner, Marcel, additional, Grady, Dai, additional, Gil-Romera, Graciela, additional, Martin-Jones, Catherine, additional, Lemma, Bruk, additional, Lamb, Henry F., additional, De Jonge, Cindy, additional, Meyer, Hanno, additional, Glaser, Bruno, additional, and Zech, Michael, additional

Published
2020
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47. Microbial lipid signatures in Arctic deltaic sediments - insights into methane cycling and climate variability

Author

Lattaud, Julie, De Jonge, Cindy, Pearson, Ann, Elling, Felix J., and Eglinton, Timothy I.

Subjects
GDGT, methane, methane cycle, Mackenzie River, temperature reconstruction, carbon isotopes
Abstract

Glycerol Dialkyl Glycerol Tetraethers (GDGTs) are ubiquitous biomolecules whose structural diversity or isotopic composition is increasingly used to reconstruct environmental changes such as air temperatures or pCO2. Isoprenoid GDGTs, in particular GDGT-0, are biosynthesized by a large range of Archaea. To assess the potential of GDGT-0 as a tracer of past methane cycle variations, three sediment cores from the Mackenzie River Delta have been studied for iGDGT and diploptene distribution and stable carbon signature. The absence of crenarchaeol, high GDGT-0 vs crenarchaeol ratio, and 13C-enriched carbon signature of GDGT-0 indicate production by acetoclastic methanogens as well as heterotrophic Archaea. The oxidation of methane seems to be dominated by bacteria as indicated by the high abundance of 13C-depleted diploptene. Branched GDGTs, thought to be produced by heterotrophic bacteria, are dominated by hexa- and penta-methylated 5- and 6-methyl compounds. The presence of 5,6-methyl isomer IIIa’’ points towards in situ production of brGDGTs, with only a minor input from soil branched GDGT brought by the Mackenzie River. Carbon isotopic compositions of brGDGTs are in agreement with heterotrophic producers, likely living during summer. The reconstructed temperatures using a global lake calibration reflect recorded summer air temperature (± 2.14 °C) during the last 60 years, and further highlight the absence of warming in summer in this region during the last 200 years. Oxygen availability and connection time to the Mackenzie River also seem to control the distribution of branched GDGT with an increase in 6-methyl and 5,6-methyl isomers with increased period of anoxia., EarthArXiv

Published
2020
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48. Biomarker (brGDGT) degradation and production in lacustrine surface sediments: Implications for paleoclimate reconstructions

Author

De Jonge, Cindy, Fiskal, Annika, Han, Xingguo, and Lever, Mark

Abstract

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a class of biomarker lipids that can be conserved over long timescales in lake sediments. Produced throughout the lake water column before settling and incorporation in the sedimentary archive, they are used to reconstruct lake water temperature changes through time. However, it is not clear how degradation and/or production of these compounds in the surface sediments influences the brGDGT signal and the reconstructed temperature record. Here we present the core lipid (“fossil”) and intact polar lipid (“recently produced”) signal of brGDGT lipids in 8 short cores collected in 4 Swiss lakes, covering a eutrophic gradient. In eutrophic conditions (Lake Baldegg), a clear subsurface (20-35 cm blf) maximum in intact polar lipids is observed (15-20%), whereas the most surficial sediments (0-2 cm blf) show the lowest percentage of IPL lipids (, EGUsphere

Published
2020
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49. A systemic overreaction to years versus decades of warming in a subarctic grassland ecosystem

Author

Walker, Tom W.N., Janssens, Ivan A., Weedon, James T., Sigurdsson, Bjarni D., Richter, Andreas, Peñuelas, Josep, Leblans, Niki I.W., Bahn, Michael, Bartrons, Mireia, De Jonge, Cindy, Fuchslueger, Lucia, Gargallo-Garriga, Albert, Gunnarsdóttir, Gunnhildur E., Marañón-Jiménez, Sara, Oddsdóttir, Edda S., Ostonen, Ivika, Poeplau, Christopher, Prommer, Judith, Radujković, Dajana, Sardans, Jordi, Sigurðsson, Páll, Soong, Jennifer L., Vicca, Sara, Wallander, Håkan, Ilieva-Makulec, Krassimira, Verbruggen, Erik, Walker, Tom W.N., Janssens, Ivan A., Weedon, James T., Sigurdsson, Bjarni D., Richter, Andreas, Peñuelas, Josep, Leblans, Niki I.W., Bahn, Michael, Bartrons, Mireia, De Jonge, Cindy, Fuchslueger, Lucia, Gargallo-Garriga, Albert, Gunnarsdóttir, Gunnhildur E., Marañón-Jiménez, Sara, Oddsdóttir, Edda S., Ostonen, Ivika, Poeplau, Christopher, Prommer, Judith, Radujković, Dajana, Sardans, Jordi, Sigurðsson, Páll, Soong, Jennifer L., Vicca, Sara, Wallander, Håkan, Ilieva-Makulec, Krassimira, and Verbruggen, Erik

Abstract

Temperature governs most biotic processes, yet we know little about how warming affects whole ecosystems. Here we examined the responses of 128 components of a subarctic grassland to either 5–8 or >50 years of soil warming. Warming of >50 years drove the ecosystem to a new steady state possessing a distinct biotic composition and reduced species richness, biomass and soil organic matter. However, the warmed state was preceded by an overreaction to warming, which was related to organism physiology and was evident after 5–8 years. Ignoring this overreaction yielded errors of >100% for 83 variables when predicting their responses to a realistic warming scenario of 1 °C over 50 years, although some, including soil carbon content, remained stable after 5–8 years. This study challenges long-term ecosystem predictions made from short-term observations, and provides a framework for characterization of ecosystem responses to sustained climate change.

Published
2020
Full Text
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50. A systemic overreaction to years versus decades of warming in a subarctic grassland ecosystem

Author

Walker, Tom W. N., primary, Janssens, Ivan A., additional, Weedon, James T., additional, Sigurdsson, Bjarni D., additional, Richter, Andreas, additional, Peñuelas, Josep, additional, Leblans, Niki I. W., additional, Bahn, Michael, additional, Bartrons, Mireia, additional, De Jonge, Cindy, additional, Fuchslueger, Lucia, additional, Gargallo-Garriga, Albert, additional, Gunnarsdóttir, Gunnhildur E., additional, Marañón-Jiménez, Sara, additional, Oddsdóttir, Edda S., additional, Ostonen, Ivika, additional, Poeplau, Christopher, additional, Prommer, Judith, additional, Radujković, Dajana, additional, Sardans, Jordi, additional, Sigurðsson, Páll, additional, Soong, Jennifer L., additional, Vicca, Sara, additional, Wallander, Håkan, additional, Ilieva-Makulec, Krassimira, additional, and Verbruggen, Erik, additional

Published
2019
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