@article{fdi:010061881,
  title = {{H}istorical assemblage distinctiveness and the introduction of widespread non-native species explain worldwide changes in freshwater fish taxonomic dissimilarity},
  author = {{T}oussaint, {A}. and {B}eauchard, {O}. and {O}berdorff, {T}hierry and {B}rosse, {S}. and {V}illeger, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}im {T}axonomic dissimilarity between assemblages can result from two processes - the replacement of species (turnover) and differences in richness - but it remains unclear how anthropogenic drivers (introductions and extirpations) affect these processes. {H}ere, we investigate how historical patterns and anthropogenic drivers shape the changes in dissimilarity and its turnover component in freshwater fish assemblages both in historical (i.e. pre-industrial) times and at the present day. {L}ocation {W}orld-wide. {M}ethods {W}e used a global database of fish assemblages in 1054 river basins throughout the world to quantify the change in turnover through its contribution to taxonomic dissimilarity between the two periods. {W}e then used random forests to disentangle the relative roles of historical distinctiveness, species introductions and species extirpations on changes in dissimilarity and on the contribution of its turnover component. {R}esults {T}he pairs of basins exhibited a decrease in the contribution of turnover to taxonomic dissimilarity of 82% and 61% in homogenized and differentiated pairs, respectively. {T}he historical number of shared species and its change after species introductions and extirpations accounted for more than 60% of the change in dissimilarity and in the turnover contribution in the six biogeographical realms. {M}ain conclusions {T}he historically high distinctiveness between pairs of basins, due to a low number of shared species, has promoted high levels of taxonomic dissimilarity. {T}he world-wide changes in taxonomic dissimilarity among fish assemblages are to a large extent coupled to a decrease in the contribution of taxonomic turnover to taxonomic dissimilarity. {H}ence, the dissimilarity between assemblages declines with decreasing species replacement. {T}hese changes are mainly explained by introductions of a small set of widespread non-native species, which promote an increase in the number of shared species. {A}longside historical distinctiveness, species introduction processes can determine whether assemblages become more homogenized or more differentiated. {O}ur results suggest that taxonomic differentiation can quickly turn to homogenization as the number of species introductions increase.},
  keywords = {turnover ; differentiation ; {B}eta diversity ; partitioning ; macroecology ; homogenization ; freshwater fish},
  booktitle = {},
  journal = {{G}lobal {E}cology and {B}iogeography},
  volume = {23},
  numero = {5},
  pages = {574--584},
  ISSN = {1466-822{X}},
  year = {2014},
  DOI = {10.1111/geb.12141},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061881},
}