Competitive interactions modify the direct effects of climate
Data files
Oct 25, 2024 version files 492.53 KB
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Analysis_figure2_3_dryad.Rmd
8.18 KB
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mossdata_dryad.csv
458.06 KB
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predictors60_dryad.csv
13.51 KB
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propchangedat.csv
8.85 KB
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README.md
3.93 KB
Abstract
As the climate is changing, species respond by changing distributions and abundances. The effects of climate are not only direct, but also occur via changes in biotic interactions, such as competition. Yet, the role of competition in mediating the effects of climate is still largely unclear. To examine how climate influences species performance, directly and via competition with other species, we transplanted two moss species differing in climate niches, alone and together at 59 sites along a climate gradient. Growth was monitored over three growing seasons. In the absence of competition, both species performed better under warmer conditions. When transplanted together, a warmer climate had instead negative effects on the northern moss, while the effects remained positive for the southern species. The negative effect of a cold climate for the southern species was larger when both species were transplanted together. Over three growing seasons, the southern species almost outcompeted the northern in warmer climates. Our results illustrate how competitive interactions can modify, and even reverse, the direct effects of climate on organism performance. A broader implication of our results is that species interactions can have important effects on how environmental and climate change influence performance and abundance.
https://doi.org/10.5061/dryad.vx0k6dk08
Data consists of three datasets and two scripts to reproduce models and figures for the manuscript “Competitive interactions modify the direct effects of climate” in review in Ecography.
All NA values are replaced with the value 9999 to avoid any empty cells. NA (9999) values means that the value is not available.
Scaled values are in the unit of standard deviations away from the mean 0.
The csv file mossdata includes growth of single and mixed transplants of the two moss species and predictors. Columns are:
site: site ID for transplant sites
moss_id: ID for each moss transplant
moss: moss species - S for Sanionia uncinata, and H for Hypnym cupressiforme
treatment: Treatment is information combining origin of moss population and whether it is a single transplant or a mixed.
- HS is Hypnum cupressiforme from its southern population
- HN is Hypnum cupressiforme from its northern population.
- SS is Sanionia uncinate from its southern population.
- SN is Sanioina uncinata from its northern population
- HSSN is Hypnum cupressiforme from its southern population growing with Sanionia uncinata from its northern population.
- HNSN is Hypnum cupressiforme from its northern population growing with Sanionia uncinata from its northern population.
- HSSS is Hypnum cupressiforme from its southern population growing with Sanionia uncinata from its southern population.
- HNSS is Hypnum cupressiforme from its northern population growing with Sanionia uncinata from its southern population.
season: Season of measure of moss transplants.
area: Area of moss transplants in cm2.
lastseason: Last season’s area of moss transplants in cm2.
species2: Moss species, S for Sanionia uncinata and H for Hypnum cupressiforme.
comp: Competition, NO for single transplants, YES for mixed transplants.
range2: Origin of moss - S for south, N for north, in the moss species respective range.
year2: Year of measure of area of moss transplants.
GDD: Growing Degree Days (climate variable from local measuring temperature loggers, unitless).
light_untransformed: Light in terms of canopy openness (proportion).
light: scaled light
VPD: Vapor Pressure Deficit measure from local measuring temperature and humidity loggers (unit: kPa).
VPDscale: VPD scaled
GDDscale: GDD scaled
lastseason2: scaled last season area of moss transplant.
predictors_60.csv includes all predictors for all initial sites scaled and unscaled format for each year separately. Untransformed means not scaled.
site: ID for transplant site
GDD: Growing Degree Days (unitless)
VPD: Vapor Pressure Deficit (unit kPa)
light: Canopy openness (proportion).
propchangedat.csv includes change in proportion of total area in cm2 held by the northern moss over three growing seasons with predictors.
site: ID for transplant site
moss_id: ID for moss transplant
range_S: origin of Sanionia uncinata
comprange_S: origin of Hypnum cupressiforme
propchange: Proportional change in relative abundance between Sanionia uncinata and Hypnu cupressiforme in mixed transplants between the start of the transplant experiment in 2019 to the end in 2021.
GDDmean: Mean values of GDD from 2019-2021 (unitless)
VPDmean: Mean values of VPD from 2019-2021 (unit kPa).
light_untransformed: Light, in terms of canopy openness (proportion).
Analysis_figure2_3.Rmd script includes code to generate models and figure 2 and figure 3.
mossmap.Rmd script includes code to generate the calculations of mean annual temperature for the European distribution of the two moss species as well as a occurrence map in 0.5 degrees resolution.