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Assessing func+onal diversity from traits to mul+dimensional indices Session 46 Trait-based approaches in coral reef ecology: from func8onal ecology to management Why measuring func4onal diversity ? Sébas4en Villéger, Eva Maire and David Mouillot Marine biodiversity lab, Montpellier, France What is func4onal diversity ? The facet of biodiversity that accounts for the biological a1ributes of organisms linked to their fitness or ecological roles, i.e. func4onal traits Tutorial and func4ons available at: h@p://villeger.sebas+en.free.fr/FD.html Contact: [email protected] Your ques4on + Your exper4se 2) Measuring func4onal traits 1) Sampling assemblages Environment Anthropogenic disturbances Ecological processes Ecosystem services Func4onal diversity of organisms Sa Sb … SN A1 A2 … AC Assemblages Species T1 T2 … TT Sa Sb … SN Func4onal traits Species Trait values Presence/absence Number of individuals Coverage/Biomass Trait matrix Assemblage matrix Species pool b) Compu4ng all func4onal spaces Mul4dimensional space Sa Sb Sd SN Sc PC2 PC1 PC3 Sa Sb … SN Sa Sb … SN Euclidean or Gower’s distance Dendrogram Sb Sa Sc Sd SN UPGMA Ward PCA PCoA a) Which func8onal traits b) How to measure them c) How to code them = Species Species Distance matrix 3) Building a func4onal space a) Compu4ng func4onal distance between all pairs of species c) Selec4ng the best func4onal space according to an objec+ve quality criteria (Maire et al. 2015, Glob. Ecol. Biogeogr.) 4) Compu4ng complementary func4onal diversity indices assessing distribu+on of species (and of their dominance) in the func+onal space for each assemblage (Mouillot et al. 2013, Trends Evol. Ecol.) 5) Compu4ng complementary func4onal dissimilarity indices assessing overlap in the func+onal space between assemblages (Villéger et al. 2013, Glob. Ecol. Biogeogr.) Species coordinates FRic FEve FDiv A1 A2 … AC Assemblages Indices Indices values Diversity matrix A1 A2 … AC A1 A2 … AC Assemblages Assemblages Dissimilarity values Dissimilarity matrix À couper

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Page 1: Trait-based approaches in coral reef ecology: from ...villeger.sebastien.free.fr/R scripts/poster ICRS Villeger.pdf · Assessing func+onal diversity from traits to mul+dimensional

Assessingfunc+onaldiversityfromtraitstomul+dimensionalindices

Session46Trait-basedapproachesincoralreefecology:fromfunc8onalecologytomanagement

Whymeasuringfunc4onaldiversity?

Sébas4enVilléger,EvaMaireandDavidMouillotMarinebiodiversitylab,Montpellier,France

Whatisfunc4onaldiversity?Thefacetofbiodiversitythataccountsforthebiologicala1ributesoforganismslinkedtotheirfitnessorecologicalroles,i.e.func4onaltraits

Tutorialandfunc4onsavailableat:

h@p://villeger.sebas+en.free.fr/FD.html

Contact:[email protected]

Yourques4on+Yourexper4se2)Measuringfunc4onaltraits1)Samplingassemblages

EnvironmentAnthropogenicdisturbances

Ecologicalprocesses

Ecosystemservices

Func4onaldiversityoforganisms

Sa Sb … SN

A1

A2

…

ACAssemblages

Species

T1 T2 … TTSaSb…SN

Func4onaltraits

Species

Traitvalues

Presence/absenceNumberofindividualsCoverage/Biomass

Traitmatrix

Assemblagematrix

Speciespool

b)Compu4ngallfunc4onalspacesMul4dimensional

space

SaSb

Sd SN

Sc

PC2

PC1

PC3

Sa Sb … SNSaSb…SN

Euclideanor

Gower’sdistance

Dendrogram

SbSa ScSd SN

UPGMAWard

PCAPCoA

a)Whichfunc8onaltraitsb)Howtomeasurethemc)Howtocodethem

=

Species

SpeciesDistancematrix

3)Buildingafunc4onalspace

a)Compu4ngfunc4onaldistancebetweenallpairsof

species

c)Selec4ngthebestfunc4onalspaceaccordingtoanobjec+vequalitycriteria

(Maireetal.2015,Glob.Ecol.Biogeogr.)

4)Compu4ngcomplementaryfunc4onaldiversityindicesassessingdistribu+onofspecies(andoftheirdominance)inthefunc+onalspaceforeachassemblage(Mouillotetal.2013,TrendsEvol.Ecol.)

5)Compu4ngcomplementaryfunc4onaldissimilarityindicesassessingoverlapinthefunc+onalspacebetweenassemblages(Villégeretal.2013,Glob.Ecol.Biogeogr.)

Speciescoordinates

FRic FEve FDiv

A1

A2

…

ACAssemblages

Indices

Indicesvalues

Diversitymatrix

A1 A2 … ACA1A2…ACAs

semblages

Assemblages

Dissimilarityvalues

Dissimilaritymatrix

Àcouper

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