Extent of intra-population functional variability along a local environmental gradient for four calcareous grasslands species Harzé Mélanie*, Monty Arnaud.

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Presentation transcript:

Extent of intra-population functional variability along a local environmental gradient for four calcareous grasslands species Harzé Mélanie*, Monty Arnaud and Mahy Grégory University of Liege, Gembloux Agro-Bio Tech, Biodiversity and Landscape Unit Augustus 2013

Context ResultsMethods Aims Take home message 1

Context ResultsMethods Aims Take home message 2 Trait-based analysis to assess response of species to environmental changes

Context ResultsMethods Aims Take home message 2 Trait-based analysis to assess response of species to environmental changes In general : species = mean trait value

Context ResultsMethods Aims Take home message 2 Trait-based analysis to assess response of species to environmental changes In general : species = mean trait value Intraspecific functional variability = a concern for ecologist

Context ResultsMethods Aims Take home message 2 Trait-based analysis to assess response of species to environmental changes In general : species = mean trait value But Intraspecific functional variability = a concern for ecologist Especially at very local scale

Context ResultsMethods Aims Take home message 3 To explore the extent of intraspecific functional variability at the population level (intra- population functional variability) along a natural environmental gradient To highlight study species functional response to the same local environmental gradient

4 Our model : – 4 Calcareous grasslands species Context ResultsMethods Aims Take home message

5 Calcareous grasslands Context ResultsMethods Aims Take home message

6 Calcareous grasslands Context ResultsMethods Aims Take home message

6 Calcareous grasslands Context ResultsMethods Aims Take home message

6 Calcareous grasslands Context ResultsMethods Aims Take home message

Context ResultsMethods Aims Take home message 7

Context ResultsMethods Aims Take home message 8

Context ResultsMethods Aims Take home message 4 Gradient – Soil depth (cm) – Heat load (PDIR) slope degree, slope orientation and latitude [ ] 9

Context ResultsMethods Aims Take home message 10 Traits – Maximum vegetative height (MVH) – Specific leaf area (SLA) – Leaf dry matter content (LDMC)

Context ResultsMethods Aims Take home message 11 Study sites

Context ResultsMethods Aims Take home message 12 Study sites

Context ResultsMethods Aims Take home message 13 Species selection – Abundance on selected sites on mesophilous calcareous grasslands on xerophilous calcareous grasslands

Context ResultsMethods Aims Take home message 14 Field methods – ~80 indiv./species on each site  MVH – 2 leaves/indiv.  SLA and LDMC – Around each indiv : soil depth, slope and orientation

Context ResultsMethods Aims Take home message 15 Gradient Soil depth gradient on study sites Heat load gradient on study sites Soil depth (cm) Heat load

Context ResultsMethods Aims Take home message 16 Extent of intrapopulation functional variability: Violin plot and coefficient of variation

Context ResultsMethods Aims Take home message 17

Context ResultsMethods Aims Take home message 18 Species Functional traits SLA (mm 2 mg -1 ) LDMC (mg g -1 ) MVH (cm) H. numm. p-value< <0.001 R2R Coef P. neum. p-value<0.001 R2R Coef S. mino. p-value0.047< R2R Coef S. colu. p-value< R2R Coef Species response to the gradient : soil depth (cm) Linear regression coefficients

Context ResultsMethods Aims Take home message 19

Context ResultsMethods Aims Take home message 20

21 Context ResultsMethods Aims Take home message Intraspecific functional variability is high even at very short scale and along very short gradient Extent of intraspecific functional variability is trait and species dependant Species functional response along gradient is the same Perspective : sources of variability?

Thank you for your attention 22