Hudson, James M G; Henry, Gregory HR (2010): (Table 1) Effects of experimental warming on plant cover and diversity indices in an evergreen shrub at Alexandra Fiord [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.811359, Supplement to: Hudson, JMG; Henry, GHR (2010): High Arctic plant community resists 15 years of experimental warming. Journal of Ecology, 98(5), 1035-1041, https://doi.org/10.1111/j.1365-2745.2010.01690.x
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Abstract:
1. Identifying plant communities that are resistant to climate change will be critical for developing accurate, wide-scale vegetation change predictions. Most northern plant communities, especially tundra, have shown strong responses to experimental and observed warming.
2. Experimental warming is a key tool for understanding vegetation responses to climate change. We used open-top chambers to passively warm an evergreen-shrub heath by 1.0-1.3 °C for 15 years at Alexandra Fiord, Nunavut, Canada (79 °N). In 1996, 2000 and 2007, we measured height, plant composition and abundance with a point-intercept method.
3. Experimental warming did not strongly affect vascular plant cover, canopy height or species diversity, but it did increase bryophyte cover by 6.3% and decrease lichen cover by 3.5%. Temporal changes in plant cover were more frequent and of greater magnitude than changes due to experimental warming.
4. Synthesis. This evergreen-shrub heath continues to exhibit community-level resistance to long-term experimental warming, in contrast to most Arctic plant communities. Our findings support the view that only substantial climatic changes will alter unproductive ecosystems.
Project(s):
Coverage:
Latitude: 78.883300 * Longitude: -75.916700
Date/Time Start: 1996-01-01T00:00:00 * Date/Time End: 2007-01-01T00:00:00
Event(s):
Alexandra_Fiord_sites * Latitude: 78.883300 * Longitude: -75.916700 * Location: Ellesmere Island, Canadian Arctic Archipelago * Method/Device: Sampling by hand (HAND)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Geocode | |||
| 2 | Treatment | Treat | Hudson, James M G | |||
| 3 | Dissimilarity index | DISS | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | Bray-Curtis | |
| 4 | Dissimilarity, standard deviation | DISS std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | |
| 5 | Shrubs | Shrubs | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | evergreen |
| 6 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | shrubs evergreen |
| 7 | Bryophyta | Bryophyta | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | |
| 8 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | bryophyta |
| 9 | Lichen | Lichen | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | |
| 10 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | lichen |
| 11 | Shrubs | Shrubs | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | deciduous |
| 12 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | shrubs deciduous |
| 13 | Grass and sedges | Grass+sedges | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | graminoids |
| 14 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | graminoids |
| 15 | Forbs | Forbs | % | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | |
| 16 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | forbs |
| 17 | Shannon Diversity Index | H' | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | ||
| 18 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | H(S) index |
| 19 | Simpson index of diversity | Simpson I | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | ||
| 20 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | Simpson's index |
| 21 | Species richness | S | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | ||
| 22 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | species richness |
| 23 | Evenness of species | E | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | Pielou's | |
| 24 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | evenness |
| 25 | Height | Height | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | canopy height, unit uncertain [cm?] | |
| 26 | Standard deviation | Std dev | ± | Hudson, James M G | Open-top chamber (OTC) warming experiment, in situ | canopy height |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
146 data points
Data
| 1 Date/Time | 2 Treat | 3 DISS (Bray-Curtis) | 4 DISS std dev [±] | 5 Shrubs [%] (evergreen) | 6 Std dev [±] (shrubs evergreen) | 7 Bryophyta [%] | 8 Std dev [±] (bryophyta) | 9 Lichen [%] | 10 Std dev [±] (lichen) | 11 Shrubs [%] (deciduous) | 12 Std dev [±] (shrubs deciduous) | 13 Grass+sedges [%] (graminoids) | 14 Std dev [±] (graminoids) | 15 Forbs [%] | 16 Std dev [±] (forbs) | 17 H' | 18 Std dev [±] (H(S) index) | 19 Simpson I | 20 Std dev [±] (Simpson's index) | 21 S | 22 Std dev [±] (species richness) | 23 E (Pielou's) | 24 Std dev [±] (evenness) | 25 Height (canopy height, unit uncertain...) | 26 Std dev [±] (canopy height) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | control (CON) | 0.13 | 0.07 | 44.0 | 10.7 | 39.6 | 10.0 | 15.8 | 7.4 | 10.2 | 7.9 | 3.2 | 0.7 | 3.2 | 1.7 | 2.33 | 0.17 | 0.84 | 0.05 | 18.6 | 0.8 | 0.12 | 0.01 | ||
| 1996 | warmed (OTC) | 0.17 | 0.03 | 57.1 | 5.7 | 41.9 | 7.4 | 7.7 | 1.8 | 7.9 | 2.9 | 5.7 | 4.0 | 4.4 | 1.9 | 2.22 | 0.14 | 0.82 | 0.02 | 19.8 | 1.5 | 0.12 | 0.01 | ||
| 2000 | control (CON) | 0.20 | 0.04 | 41.5 | 3.6 | 35.3 | 5.8 | 5.3 | 1.2 | 9.2 | 2.3 | 4.4 | 1.4 | 3.4 | 1.0 | 2.03 | 0.08 | 0.81 | 0.02 | 13.6 | 0.8 | 0.15 | 0.01 | 36.6 | 7.8 |
| 2000 | warmed (OTC) | 0.18 | 0.03 | 44.6 | 5.3 | 42.9 | 5.5 | 3.5 | 1.2 | 7.9 | 2.5 | 4.1 | 1.9 | 4.8 | 1.6 | 1.98 | 0.02 | 0.80 | 0.02 | 13.3 | 1.0 | 0.15 | 0.01 | 29.8 | 8.4 |
| 2007 | control (CON) | 0.19 | 0.03 | 53.1 | 9.7 | 49.0 | 6.7 | 8.5 | 2.5 | 11.4 | 2.6 | 3.1 | 1.3 | 1.8 | 0.9 | 2.11 | 0.08 | 0.82 | 0.02 | 15.7 | 1.3 | 0.13 | 0.01 | 34.9 | 8.3 |
| 2007 | warmed (OTC) | 0.22 | 0.03 | 54.4 | 10.7 | 61.2 | 5.9 | 6.0 | 1.4 | 9.3 | 2.5 | 3.4 | 1.2 | 2.1 | 0.7 | 2.13 | 0.03 | 0.82 | 0.03 | 16.4 | 1.4 | 0.13 | 0.01 | 32.7 | 7.9 |