Abstract
Littorella uniflora and Lobelia dortmanna are prominent small rosette species in nutrient-poor, soft-water lakes because of efficient root exchange of CO 2 and O 2. We hypothesise that higher gas exchange across the leaves of L. uniflora than of L. dortmanna ensures O 2 uptake from water and underlies its greater tolerance to sediment anoxia following organic enrichment. We studied plant response to varying sediment O 2 demand and biogeochemistry by measuring photosynthesis, gas exchange across leaves and O 2 dynamics in plants during long-term laboratory and field studies. Frequent non-destructive sampling of sediment pore water was used to track changes in sediment biogeochemistry. Addition of organic matter triggered O 2 depletion and accumulation of , Fe 2+ and CO 2 in sediments. Gas exchange across leaf surfaces was 13-16 times higher for L. uniflora than for L. dortmanna. Oxygen in the leaf lacunae of L. uniflora remained above 10kPa late at night on anoxic sediments despite organic enrichment. Leaf content of N and P of L. uniflora remained sufficient to keep up photosynthesis despite prolonged sediment anoxia, whereas nutrient content was too low for long-term survival of L. dortmanna. High gas exchange across L. uniflora leaves improves its performance and survival on anoxic sediments compared with L. dortmanna. Lobelia dortmanna uses the same gas-tight leaves in air and water, which makes it highly susceptible to sediment anoxia but more cost-effective in ultra-oligotrophic environments because of slow leaf turnover.
| Original language | English |
|---|---|
| Journal | Freshwater Biology |
| Volume | 57 |
| Issue number | 9 |
| Pages (from-to) | 1875-1883 |
| Number of pages | 9 |
| ISSN | 0046-5070 |
| DOIs | |
| Publication status | Published - Sept 2012 |