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Catchment properties and the photosynthetic trait composition of freshwater plant communities

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Science  15 Nov 2019:
Vol. 366, Issue 6467, pp. 878-881
DOI: 10.1126/science.aay5945
  • Fig. 1 Bicarbonate use in submerged freshwater plant communities.

    (A) Likelihood of observing a bicarbonate user versus a CO2 user in streams (n = 172 samples; red) and lakes (n = 791 samples; blue). (B and C) Modeled odds of observing a bicarbonate user versus a CO2 user as a function of bicarbonate (B) or CO2 (C) concentration. Values >1 indicate a higher likelihood (A) or increase in likelihood (B and C) of observing a bicarbonate user versus a CO2 user with a one-unit increase in bicarbonate (B) or CO2 (C) concentration. The dotted vertical lines show mean estimates, and shaded areas show the 95% confidence limits around the mean.

  • Fig. 2 Global relationship between bicarbonate concentration and the proportion of bicarbonate users in freshwater plants.

    (A) Proportion of bicarbonate-using species across 52 plant ecoregions. Gray areas indicate regions where information on bicarbonate use in local plants is not available. (B) Relationship between mean bicarbonate concentration in plant regions and frequency of bicarbonate users. The line represents the mean proportion of bicarbonate users. (C) Density plots of bicarbonate preferences for bicarbonate users (n = 57) and obligate CO2 users (n = 72). The central horizontal black lines represent the means, and the boxes indicate the 95% confidence intervals around the means.

  • Fig. 3 Steep gradients in bicarbonate concentrations and spatial separation in species distribution in the British Isles.

    Distribution of two pondweed species with contrasting bicarbonate use in the British Isles. Potamogeton polygonifolius (obligate CO2 user; black triangles) is found in areas with lower bicarbonate concentrations than are present where Potamogeton crispus (bicarbonate user; white circles) is found. The top left inset shows the density distribution of the two species across bicarbonate concentrations. Bicarbonate concentrations are from the global bicarbonate map (fig. S2), and species data were extracted from the geo-referenced plant occurrences (15).

Supplementary Materials

  • Catchment properties and the photosynthetic trait composition of freshwater plant communities

    L. L. Iversen, A. Winkel, L. Baastrup-Spohr, A. B. Hinke, J. Alahuhta, A. Baattrup-Pedersen, S. Birk, P. Brodersen, P. A. Chambers, F. Ecke, T. Feldmann, D. Gebler, J. Heino, T. S. Jespersen, S. J. Moe, T. Riis, L. Sass, O. Vestergaard, S. C. Maberly, K. Sand-Jensen, O. Pedersen

    Materials/Methods, Supplementary Text, Tables, Figures, and/or References

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    • Materials and Methods 
    • Figs. S1 to S7
    • Table S1
    • References 

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