three-year maintained drought reduces diversity in gypsum ... · background observational studies...
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Three-year maintained drought
reduces diversity in gypsum
annual plant communities
Roberto, López-Rubio, David S. Pescador,
Adrián Escudero, Ana, M. Sánchez
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Background
Observational studies
Experimental studies
Luzuriaga et al. (2012). PLoS ONE 7: e41270.
Our study
López-Peralta et al. (2016). Annals of Botany 117:1221-1228
López-Peralta et al. (sent). Journal of Ecology
Variability of the rainfall pattern
Experimental field study under global change
scenario
Which are the main factor affecting the assemblage of these communities?
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Our study
Partial rain exclusion applied to the whole community
Field experimental approach
Rain reduction of rainfall and soil humidity
MODEL PREDICTIONS:
SIMULATION OF PREDICTED FUTURE CONDITIONS
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Questions
How will the drought treatment affect community assembly?
Will the drought generate a change in species composition?
Will this change be based on a functional species sorting?
Will this change produce a decrease in functional diversity?
Freq
uen
cy
Trait
CWM
Freq
uen
cy
RaoQ
Species richness and cover
Trait
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Study site
Study place Biotic conditions
Mean annualPrec (365 mm) and
Tª (13-15 °C)
Cover of perennial plants around 30 %
Biological Soil Crust
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Study site
More than 100 species and 26 families;
up to 38 species/0.25 m2
Annual plant communityBiotic conditions
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25 cm
Experimental design
Block
Control Drought
Cover is annually recorded at the flowering peak
3 Years of data collection(by now)
7 Blocks2 Treatments plot 3x3 m
4 subplot 25x25 cm3 m
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SLALDMC
Plant HeightMax WidthRoot/shoot biomass
Seed massReproductive/vegetative biomass
Functional traits
Regeneration
Leaf
Plant
Resource uptake
CWM
RaoQ
Mean value of a trait based on species abundances
Variability of a trait in the community (Functional diversity)
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Soil humidity monitoring
Data analyses
GLMMs ~ Treatment x BSC’s cover + 1|Year + 1|Block/Subplot
Fix factor Random factors
Covariate
PERMANOVAs
Reduction of:50-60% at 5 cm20% at 10 cm
Each year composition ~ Treatment x BSC’s cover x Block, 999, Bray-Curtis
Taxonomic and
functional indices
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Results and Discussion
Richness 65 species and 26 families90% cover
Mea
ns
P < 0.05 P < 0.05 n.s.Treatment
Richness Inverse Simpson index Evenness
Treatment*BSC No significance in any model
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Composition
2016 2017 2018
n.s. P < 0.01 P < 0.001
Results and Discussion
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Functional composition
Regeneration
Leaf
Plant
SLA
CW
M’s
mea
n
P < 0.001
Results and Discussion
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Results and Discussion
Functional composition
Regeneration
Leaf
Plant
Wid
th(m
m)
CW
M’s
mea
n
Hei
gth
(mm
) C
WM
’sm
ean
P < 0.05
P < 0.05
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Functional composition
Regeneration
Leaf
PlantSe
ed
mas
s (µ
g) C
WM
’s m
ean
Rep
/Veg
CW
M’s
mea
n
P < 0.01
P < 0.05
Results and Discussion
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Results and Discussion
Regeneration
Leaf
Plant
Control Drought
Resourceuptake
Functional composition
Communities under the rain exclusion have a more stress-resistant functional design
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Functional diversity
Leaf Plant
P < 0.01 P < 0.05
Results and Discussion
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Conclusions
Drought treatment reduced both taxonomic and functional diversity
We observed a functional convergence towards a more stress-resistant design when drought
treatment was applied
Control Drought
This was possibly due to a reduction in growth period associated with the
drought treatment
Future lines
Measure the importance of intraspecific trait variation