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Charophytes collapse beyond a critical warming and brownification threshold in shallow lake systems
Lund Univ, Dept Biol Aquat Ecol, Ecol Bldg, SE-22362 Lund, Sweden;Swedish Univ Agr Sci, Dept Aquat Sci & Environm Assessment, Box 7050, S-75007 Uppsala, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. HIFMB, Ammerlander Heerstr 231, D-26129 Oldenburg, Germany;Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Schleusenstr 1, D-26382 Wilhelmshaven, Germany.ORCID iD: 0000-0001-9560-8374
Lund Univ, Dept Biol Aquat Ecol, Ecol Bldg, SE-22362 Lund, Sweden;Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China.
Lund Univ, Dept Biol Aquat Ecol, Ecol Bldg, SE-22362 Lund, Sweden;Cty Adm Board Skane Environm & Climate, Sodergaten 5, S-20515 Malmo, Sweden.
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2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 661, p. 148-154Article in journal (Refereed) Published
Abstract [en]

Charophytes play a critical role for the functioning of shallow lake ecosystems. Although growth of charophytes can be limited by many factors, such as temperature, nutrients and light availability, our understanding about concomitant effects of climate warming and other large-scale environmental perturbations, e.g. increases in humic matter content ('brownification') is still limited. Here we conducted an outdoor mesocosm experiment during 71 days with a common charophyte species, Chara vulgaris, along an increasing gradient of temperature and brownification. We hypothesized the growth of C. vulgaris to increase with temperature, but to level off along the combined temperature and brownification gradient when reaching a critical threshold for light limitation via brownification. We show that C. vulgaris increases the relative growth rate (RGR), main and total shoot elongation, as well as number of lateral shoots when temperature and brownification increased by +2 degrees C and + 100%, respectively above today's levels. However, the RGR, shoot elongation and number of lateral shoots declined at further increment of temperature and brownification. Macrophyte weight-length ratio decreased with increased temperature and brownification, indicating that C. vulgaris allocate more resources or energy for shoot elongation instead of biomass increase at warmer temperatures and higher brownification. Our study shows that C. vulgaris will initially benefit from warming and brownification but will then decline as a future scenario of increased warming and brownification reaches a certain threshold level, in case of our experiment at +4 degrees C and a 2-fold increase in brownification above today's levels. 

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 661, p. 148-154
Keywords [en]
Climate change, Chara vulgaris, Freshwater, Growth rate, Humic substances, Mesocosm
National Category
Climate Research
Identifiers
URN: urn:nbn:se:uu:diva-378611DOI: 10.1016/j.scitotenv.2019.01.177ISI: 000458408200016PubMedID: 30669047OAI: oai:DiVA.org:uu-378611DiVA, id: diva2:1295154
Funder
Swedish Research Council Formas, 226-2012-1824Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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Urrutia Cordero, Pablo

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