@article{fdi:010080562, title = {{G}lobal biogeography and diversification of a group of brown seaweeds ({P}haeophyceae) driven by clade-specific evolutionary processes}, author = {{V}ieira, {C}. and {S}teen, {F}. and {D}'{H}ondt, {S}. and {B}afort, {Q}. and {T}yberghein, {L}. and {F}ernandez-{G}arcia, {C}. and {W}ysor, {B}. and {T}ronholm, {A}. and {M}attio, {L}. and {P}ayri, {C}laude and {K}awai, {H}. and {S}aunders, {G}. and {L}eliaert, {F}. and {V}erbruggen, {H}. and {D}e {C}lerck, {O}.}, editor = {}, language = {{ENG}}, abstract = {{A}im: {H}istorical processes that shaped current diversity patterns of seaweeds remain poorly understood. {U}sing {D}ictyotales, a globally distributed order of brown seaweeds as a model, we test if historical biogeographical and diversification patterns are comparable across clades. {D}ictyotales contain some 22 genera, three of which, {D}ictyota, {L}obophora and {P}adina, are exceptionally diverse. {S}pecifically, we test whether the evolutionary processes that shaped the latitudinal diversity patterns in these clades are in line with the tropical conservatism, out-of-the-tropics or diversification rate hypotheses. {L}ocation: {G}lobal coastal benthic marine environments. {T}axon: {D}ictyotales ({P}haeophyceae). {M}ethods: {S}pecies diversity was inferred using {DNA}-based species delineation, addressing cryptic diversity and circumventing taxonomic problems. {A} six-gene time-calibrated phylogeny, distribution data of 3,755 specimens and probabilistic modelling of geographical range evolution were used to infer historical biogeographical patterns. {T}he phylogeny was tested against different trait-dependent models to compare diversification rates for different geographical units as well as different thermal affinities. {R}esults: {O}ur results indicate that {D}ictyotales originated in the {M}iddle {J}urassic and reach a current peak of species diversity in the {C}entral {I}ndo-{P}acific. {A}ncestral range estimation points to a southern hemisphere origin of {D}ictyotales corresponding to the tropical southern {T}ethys {S}ea. {O}ur results demonstrate that diversification rates were generally higher in tropical regions, but increased diversification rates in different clades are driven by different processes. {O}ur results suggest that three major clades underwent a major diversification burst in the early {C}enozoic, with {D}ictyota and {P}adina expanding their distribution into temperate regions while {L}obophora retained a predominantly tropical niche. {M}ain conclusions: {O}ur results are consistent with both the tropical conservatism hypothesis, in which clades originate and remain in the tropics ({L}obophora), and the out-of-the-tropics scenario, where taxa originate and expand towards the temperate regions while preserving their presence in the tropics ({D}ictyota, {P}adina).}, keywords = {dictyotales ; historical biogeography ; macroevolution ; multilocus ; phylogeny ; out-of-the-tropics hypothesis ; tropical conservatism ; hypothesis ; {ATLANTIQUE} ; {PACIFIQUE} ; {OCEAN} {INDIEN}}, booktitle = {}, journal = {{J}ournal of {B}iogeography}, volume = {48}, numero = {4}, pages = {703--715}, ISSN = {0305-0270}, year = {2021}, DOI = {10.1111/jbi.14047}, URL = {https://www.documentation.ird.fr/hor/fdi:010080562}, }