@article{PAR00009374, title = {{Q}uantifying phylogenetic beta diversity : distinguishing between 'true' turnover of lineages and phylogenetic diversity gradients}, author = {{L}eprieur, {F}. and {A}lbouy, {C}. and {D}e {B}ortoli, {J}ulien and {C}owman, {P}. {F}. and {B}ellwood, {D}. {R}. and {M}ouillot, {D}.}, editor = {}, language = {{ENG}}, abstract = {{T}he evolutionary dissimilarity between communities (phylogenetic beta diversity {PBD}) has been increasingly explored by ecologists and biogeographers to assess the relative roles of ecological and evolutionary processes in structuring natural communities. {A}mong {PBD} measures, the {P}hylo{S}or and {U}ni{F}rac indices have been widely used to assess the level of turnover of lineages over geographical and environmental gradients. {H}owever, these indices can be considered as 'broad-sense' measures of phylogenetic turnover as they incorporate different aspects of differences in evolutionary history between communities that may be attributable to phylogenetic diversity gradients. {I}n the present study, we extend an additive partitioning framework proposed for compositional beta diversity to {PBD}. {S}pecifically, we decomposed the {P}hylo{S}or and {U}ni{F}rac indices into two separate components accounting for 'true' phylogenetic turnover and phylogenetic diversity gradients, respectively. {W}e illustrated the relevance of this framework using simple theoretical and archetypal examples, as well as an empirical study based on coral reef fish communities. {O}verall, our results suggest that using {P}hylo{S}or and {U}ni{F}rac may greatly over-estimate the level of spatial turnover of lineages if the two compared communities show contrasting levels of phylogenetic diversity. {W}e therefore recommend that future studies use the 'true' phylogenetic turnover component of these indices when the studied communities encompass a large phylogenetic diversity gradient.}, keywords = {}, booktitle = {}, journal = {{P}los {O}ne}, volume = {7}, numero = {8}, pages = {e42760}, ISSN = {1932-6203}, year = {2012}, DOI = {10.1371/journal.pone.0042760}, URL = {https://www.documentation.ird.fr/hor/{PAR}00009374}, }