Catchment properties and the photosynthetic trait composition of freshwater plant communities

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Iversen, L. L.; Winkel, A.; Baastrup-Spohr, L.; Hinke, A. B.; Alahuhta, J.; Baattrup-Pedersen, A.; Birk, S.; Brodersen, P.; Chambers, P. A.; Ecke, F.; Feldmann, T.; Gebler, D.; Heino, J.; Jespersen, T. S.; Moe, S. J.; Riis, T.; Sass, L.; Vestergaard, O.; Maberly, S. C.; Sand-Jensen, K.; Pedersen, O. (2019) Catchment properties and the photosynthetic trait composition of freshwater plant communities. Science Vol. 366, Issue 6467, pp. 878-881. https://doi.org/10.1126/science.aay5945

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Title: Catchment properties and the photosynthetic trait composition of freshwater plant communities
Author: Iversen, L.L.; Winkel, A.; Baastrup-Spohr, L.; Hinke, A.B.; Alahuhta, J.; Baattrup-Pedersen, A.; Birk, S.; Brodersen, P.; Chambers, P. A.; Ecke, F; Feldmann, T.; Gebler, D.; Heino, J.; Jespersen, T. S.; Moe, S. J.; Riis, T.; Sass, L.; Vestergaard, O.; Maberly, S. C.; Sand-Jensen, K.; Pedersen, O.
Publisher: American Association for the Advancement of Science
Date: 2019
Language: en
Belongs to series: Science Vol. 366, Issue 6467, pp. 878-881
ISSN: 0036-8075
DOI: https://doi.org/10.1126/science.aay5945
URI: http://hdl.handle.net/10138/340216
Abstract: Unlike in land plants, photosynthesis in many aquatic plants relies on bicarbonate in addition to carbon dioxide (CO2) to compensate for the low diffusivity and potential depletion of CO2 in water. Concentrations of bicarbonate and CO2 vary greatly with catchment geology. In this study, we investigate whether there is a link between these concentrations and the frequency of freshwater plants possessing the bicarbonate use trait. We show, globally, that the frequency of plant species with this trait increases with bicarbonate concentration. Regionally, however, the frequency of bicarbonate use is reduced at sites where the CO2 concentration is substantially above the air equilibrium, consistent with this trait being an adaptation to carbon limitation. Future anthropogenic changes of bicarbonate and CO2 concentrations may alter the species compositions of freshwater plant communities.One sentence summary: The widespread photosynthetic trait of freshwater plants, bicarbonate use, has a global biogeography controlled by catchment characteristics
Description: Change in plants as bicarbonate rises Freshwater plants can be broadly divided into two major categories according to their photosynthetic traits: Some use carbon dioxide as their carbon source, whereas others use bicarbonate. Iversen et al. found that the relative concentrations of these two inorganic carbon forms in water determine the functional composition of plant communities across freshwater ecosystems (see the Perspective by Marcé and Obrador). They created global maps revealing that community composition is structured by catchment geology and not climate (in contrast to the terrestrial realm, where the trait composition is structured by temperature and rainfall). Anthropogenic influences from land-use change are causing large-scale increases in bicarbonate concentrations in freshwater catchments and are thus leading to wholesale changes in the composition of their aquatic plant communities.
Subject: carbon dioxide
plants
bicarbonates
climate changes
carbon
emissions
photosynthesis
greenhouse gases
water
plant communities
diffusion
environmental changes
carbon capture and storage
trait composition
freshwater
communities
Subject (ysa): hiilidioksidi
kasvit
bikarbonaatit
ilmastonmuutokset
hiili
päästöt
yhteyttäminen
kasvihuonekaasut
vesi
kasviyhdyskunnat
diffuusio (fysikaaliset ilmiöt)
ympäristönmuutokset
hiilidioksidin talteenotto ja varastointi
makea vesi


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