Post on 09-Jul-2020
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:sebas+en.villeger@cnrs.fr
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