Algal Community Change in Mountain Lakes of the Alps Reveals Effects of Climate Warming and Shifting Treelines 1 .

Autor: Kuefner W; Department for Life Science Systems, Aquatic Systems Biology Unit, Limnological Research Station Iffeldorf, Technical University of Munich, Hofmark 1-3, D-82393, Iffeldorf, Germany., Hofmann AM; Department for Life Science Systems, Aquatic Systems Biology Unit, Limnological Research Station Iffeldorf, Technical University of Munich, Hofmark 1-3, D-82393, Iffeldorf, Germany., Geist J; Department for Life Science Systems, Aquatic Systems Biology Unit, Technical University of Munich, Mühlenweg 22, D-85354, Freising, Germany., Dubois N; Department Surface Waters - Sedimentology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Überlandstrasse 133, CH-8600, Dübendorf, Switzerland., Raeder U; Department for Life Science Systems, Aquatic Systems Biology Unit, Limnological Research Station Iffeldorf, Technical University of Munich, Hofmark 1-3, D-82393, Iffeldorf, Germany.
Jazyk: angličtina
Zdroj: Journal of phycology [J Phycol] 2021 Aug; Vol. 57 (4), pp. 1266-1283. Date of Electronic Publication: 2021 May 15.
DOI: 10.1111/jpy.13163
Abstrakt: The biological communities of mountain lakes are suspected to be highly sensitive to global warming and associated catchment changes. To identify the parameters determining algal community responses, subfossil pigments from 21 different mountain lakes in the Bavarian-Tyrolean Limestone Alps were investigated. Sediment cores were radio-isotopically dated, and their pigment preservation evaluated. General additive models (GAM) of pigment compositions were calculated with temperature as the explanatory variable and generalized linear models with several lake parameters explaining log-transformed GAM P-values. Lake depth and trophic state were identified as major control variables of the algal community and productivity changes. Shifts in a deep oligotrophic alpine lake (lg(P) = -1.04) were half as strong as in a shallow mesotrophic alpine lake (lg(P) = -1.86) with faster warming and higher productivity forcing the development of biomass. Phytoplankton and macrophyte pigments increased clearly with warming, at lower altitudes, and decreased at the treeline, so that periphytic pigments dominated alpine sediments. This pattern is probably the result of interactions of UV radiation and allochthonous inputs of DOM. Our findings suggest that (sub)alpine shallow lakes with higher nutrient levels are most vulnerable to climate change-driven changes whereas deep, nutrient-poor lakes appear more resilient.
(© 2021 The Authors. Journal of Phycology published by Wiley Periodicals LLC on behalf of Phycological Society of America.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje