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| Open AccessExperimental evidence for recovery of mercury-contaminated fish populations
In a 15-year whole-ecosystem, single-factor experiment, stopping experimental mercury loading results in rapid decreases in methylmercury contamination of fish populations and almost complete recovery within the timeframe of the study.
- Paul J. Blanchfield
- , John W. M. Rudd
- & Michael T. Tate
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Letter |
Increasing wildfires threaten historic carbon sink of boreal forest soils
Soil radiocarbon dating reveals that combusted ‘legacy carbon’—soil carbon that escaped burning during previous fires—could shift the carbon balance of boreal ecosystems, resulting in a positive climate feedback.
- Xanthe J. Walker
- , Jennifer L. Baltzer
- & Michelle C. Mack
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Letter |
Effects of climate warming on photosynthesis in boreal tree species depend on soil moisture
Low soil moisture may reduce, or even reverse, the potential benefits of climate warming on photosynthesis in mesic, seasonally cold environments, both during drought and in regularly occurring, modestly dry periods during the growing season.
- Peter B. Reich
- , Kerrie M. Sendall
- & Rebecca A. Montgomery
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Letter |
Boreal and temperate trees show strong acclimation of respiration to warming
Acclimation of leaf respiration to a 3–5-year period of warming by 3.4 °C for 10 North American tree species in forest conditions eliminated 80% of the increase in leaf respiration expected of non-acclimated trees; this suggests that the increase in respiration rates of terrestrial plants from climate warming, and the associated increase in atmospheric CO2 levels, may be less than anticipated.
- Peter B. Reich
- , Kerrie M. Sendall
- & Rebecca A. Montgomery