Bouget, Christophe

Courbaud, Benoît

Gouix, Nicolas

Goulard, Michel

Kraus, Daniel

Lachat, Thibault

Ladet, Sylvie

Larrieu, Laurent

Paillet, Yoan

Rose, Olivier

Stillhard, Jonas

Courbaud, Benoit

Michel, Goulard

HAL Descartes

Spatial patterns of Tree-related Microhabitats: key factors and ecological significance for the conservation of the associated biodiversity

Stillhard , Jonas

ProdInra

Spatial patterns of Tree-related Microhabitats: key factors and ecological significance for the conservation of the
associated biodiversity

Hal-Diderot

Archive Ouverte en Sciences de l'Information et de la Communication

Spatial patterns of tree-related microhabitats: key factors and ecological significance for the conservation of the associated biodiversity

Open Archive Toulouse Archive Ouverte

    OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible Any correspondence concerning this service should be sent  to the repository administrator: tech-oatao@listes-diff.inp-toulouse.fr This is an author’s version published in: http://oatao.univ-toulouse.fr/20226  To cite this version:  Larrieu, Laurent  and Bouget, Christophe and Courbaud, Benoît and Gouix, Nicolas and Goulard, Michel  and Kraus, Daniel and Lachat, Thibault and Ladet, Sylvie  and Paillet, Yoan and Rose, Olivier and Stillhard, Jonas Spatial patterns of tree-related microhabitats: key factors and ecological significance for the conservation of the associated biodiversity. (2018) In: 5. European Congress of Conservation Biology, 12 June 2018 - 15 June 2018 (Jyvaskyla, Finland). (Unpublished)  Open 1\r<.;hivc 'l'uuluusc Archive Ouvcrlc (OA'l'AO) t-::> Spatial patterns of Tree-related Microhabitats:key factors and ecological significance for the conservation of the associated biodiversity5th European Congress of Conservation Biology, Jyvaskyla, Finland, 12-15th June 2018Laurent LARRIEUChristophe BOUGETBenoît COURBAUDNicolas GOUIXMichel GOULARDDaniel KRAUSThibault LACHATSylvie LADETYoan PAILLETOlivier ROSEJonas STILLHARD~ l ii~ q,1 •muschE 8. ,;,;= C ~F r,s,AA!!;;,"'.),'(::,J:;t\' . OYN. rt)R 1-'I a, •.. •-"" ,.,,,.,,. ,,., WSl f,,,1 ~""'''· ol '"'""' • ,. .. Conservatolres ~ d'espaces naturel5 t ,. A Tree-related Microhabitat (TreM) is a specific above-ground tree morphological singularity (Larrieu, Paillet, Winter et al. 2017)• distinct, well delineated structure• borne by standing living or dead trees• essential substrate or life-site for taxa• encompassing decaying wood (=saproxylic TreM) or not (=epixylic TreM)Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaDrawings  L. ApfelbacherCavities Injuries Crown deadwood Excrescences Fungi Epiphytes Exudates7 FormsStand scalesscccTReMs are key features for many taxa and participate in a complex functional habitat network in species life cyclesExamples of  supplementation (s) and complementation (c) resourcesPractical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaTreM scale.~ 4= TreM-bearing treesø ø%  TreM-bearing treesN/haN/haTreMTreM+TreM%N/haTreM(See also:  Michel et al. CJFR 2011; Vuidot et al. BC 2011; Regnery et al. FEM 2013)Large trees bear most of the TreMs within a forest stand (e.g. Larrieu et al. EJFR 2012)Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxa0 (D 0 It) 0 st 0 ('I) 0 N 0 ,.. o~ :d::t::__J__L_J__L_JI:::::3:~~ ST LT VL LST < 17.5 17.5 - 27.5 27.5- 47.5 47.5 - 67.S 67.5- 87.5 > 87.5 d1ame er category (cm) C0 ci (\I 0 0 ci Old growth forests Managed standsStochastic events• Neighbour-tree falling• Lightning• Wind damages• Rock fallBiotic processes• Woodpecker drillings• Between-tree light competition• Cambium dysfunctioning• Etc.Forestry operations• Tree-marking• Harvesting injuries  Does the spatial  pattern of the largest trees drive the spatial pattern of the TreMs at the stand level?Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaTree dbh ?-., 4F Practical issuesIntroduction Old growth forestsOld growth fore ts Managed standsSpatial patternsSp tial patterns TreM-dwelling taxaAt a multi-site sample level, the probability of bearing a TreMincreases with dbh but the direction of this relationship is variable at the plot level • Time since the last harvest > 100 y• 5 sites/126 plots/5519 trees• 11 TreM groups• GLM binomial (Y=with a TreM or not)>Fagus sylvatica 50%Spatialized dbh model *** Non-spatialized dbh model Probability to bear a TreM(fitted values)ø øglobal plotø øa(plot) + b(plot) * dbha(plot) + b * dbh1 plot.. 50 100 50 ) ) Time since the last harvest influences the spatial pattern of the TreM-bearing treesPractical issuesIntroduction Old growth forestsOld growth fore ts Managed standsSpatial patternsSp tial patterns TreM-dwelling taxa• 25 sites/165 plots/11425 trees• 11 TreM groups• GLM binomial (Y=with a TreM or not)• 4 variables describing tree-neighborhood-d to the closer TreM-bearing tree-d to the closer tree without TreM-nb TreM-bearing trees in a 40m-buffer-nb trees without TreM in a 40m-bufferTime since the last harvest Deviance explained by the modelSignificant deviation values compared to null model>Fagus sylvatica 50%>100y 50-100y <50yI[). C'\I 0 0 I I I I I I 0 I I C\l I I I I I I I I I I I I LO T""" 0 0 Studying spatial distribution pattern of TreM-bearing trees is more challenging than expected… Some preliminary results• No clear and universal  spatial pattern by analyzing a set of  11 TreM groups• In addition to a dbh effect, there is a strong site_plot_managing effect Some methodological challenges in spatial pattern study• Scarcity of most of the TreM types  need of large-area plots with georeferenced trees• But changing the spatial extent and the grain size may affects the results (in agreement with the « Modifiable Areal Unit Problem”, Openshaw 1983)• Need of additional variables describing the local context: slope, presence of cliffs, woodpecker assemblages, etc.• TreMs are “ephemeral resource patches” (sensu Finn 2001)  dynamic spatial distribution patternsPractical issuesIntroduction Old growth forestsOld growth fore ts Managed standsSpatial patternsSp tial patterns TreM-dwelling taxaIs the dissimilarity of assemblages hosted by tree-cavities related to the between-cavity geometric distance? Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxa« distance decay of similarity » (Nekola & White, 1999) 1 kmemergence trapGresigne (France)Quercus  petraeaBase rot-holes189 traps1yearTrunkCavityCollecting flaskPipeCanvasMouldFagus sylvaticaBase rot-holes50 traps1yearTrunkCavityCollecting flaskPipeCanvasMould100 mUholka (Ukraine)• • ' • II • • • ., • •• .. • r ~/ ~ • 0 0 I "' ., e, I ., The closer, the more similar? The distance decay of similarity pattern for cavity-dwelling biodiversity is not consistentns***Distance between trapped cavitiesGresigne (France) Uholka (Ukraine)Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxa0 6000 m 0 400 mq 0 C!Dl) 0 cP @o 0 /pO OD 0 0 0 0 0 'o 0 00 00 0 0 0 00 0 00 0 0 0 0 0 00 0 0 0 0 0 ~ 00 Cl> 00 0 OODO 0 co 0 0 0 00 0 0 000:000 0 0 0 0 0 00 00 0 COll) 0 (Q) 0 000 000 (Q) ~ 0 0 0 0 0 0 00 C03I!) 00 00 0 0 ~ 0 C\J 0 0 0 0 00 0(11) 0 0 0 4000 100 200 300 Does an increasing density of sporocarps at tree or plot scales foster the mean species richness of fungus-dwelling beetles in sporocarps?The Vosges mountains (France)COMFRAVEN1, 2 et 3Fagus sylvatica• 196 traps• 1 yearFomes fomentariusPractical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaFine-scale habitat aggregation has a positive effect on the local species richness of fungus-dwelling beetles…Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaTree-scale***0.3 ha scalensSee also Jonsell et al. (1999); Rukke et Midtgaard (1998)…but neither mass effect nor dilution effect of mid-scale habitat aggregation• .. '° -• • • • • • 0 •• o . • Cl) .. .. ... .. .. • .. .. (l) ... ... .. • • • .. .. • u ....._. . • • • (l) • • • • .. • CL Ul Cl) .... .... .. .. • .. • .. .. Q) • • .. ;:::; • • • • • .. Q) Q) • .. .. • .. C 0 0 - • • • • • • • • .... ... C • • • .. • .. • • C • ....... • .. ... .. • .. .. • • .. • ............... ....... .... .. • .. • .. • .. • • • .. • .... .. ... • .. • • .. .. • lO ... ... .. IO - • .. • .. ... • ..... ..... ... • .. • • .. .. • • .. • • ... • .& ... .. .& ..... • .. • • .. 0 0 . . 0 10 20 30 40 0 2 6 8 0 2 number of sporocarps per tree nb. ungus-bearing. rees.O 3ha Practical issuesIntroduction Old growth forests Managed standsSpatial patterns TreM-dwelling taxaIn a nutshell…Thank you for your attention  Spatial scale of studies strongly influences : The relationship between tree-dbh and the probability to bear a TreM The relationship between spatial patterns of TreMs and associated biodiversity Other features than tree-dbh should be considered to explain spatial patterns of Trem-bearing trees Both alpha and beta diversity of TreM-dwelling beetles may be influenced by the spatial distribution of TreMs

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Spatial patterns of tree-related microhabitats: key factors and ecological significance for the conservation of the associated biodiversity

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