@article{fdi:010077071,
  title = {{R}egional rainfall and local topography jointly drive tree community assembly in lowland tropical forests of {N}ew {C}aledonia},
  author = {{B}lanchard, {G}. and {M}unoz, {F}. and {I}banez, {T}. and {H}equet, {V}anessa and {V}androt, {H}. and {G}irardi, {J}. and {B}irnbaum, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}im {T}o understand how variations in precipitation and topographic wetness influence tree community assembly at both regional and landscape scales in tropical forests. {L}ocation {N}ew {C}aledonia ({SW} {P}acific). {M}ethods {W}e sampled 40 tree communities in 0.04-ha plots laid along topographic gradients within two landscapes with contrasting precipitation. {W}ithin a dry (<1,400 mm/year) and a wet (>2,500 mm/year) landscape we used the {T}opographic {W}etness {I}ndex ({TWI}) to sample communities in topographic position with low (e.g., ridges) and high (e.g., valleys) water accumulation. {F}or each sampled species, we measured five functional traits involved in drought resistance and resource acquisition (wood density, leaf area, leaf specific area, leaf dry matter content, and leaf thickness). {W}e first examined trait covariation across species. {W}e then analysed how the functional composition of communities varied between landscapes (according to precipitation) and within landscapes (according to {TWI}), using trait-based statistics and null models. {R}esults {W}e identified two ecological trade-offs driving trait variation across species: (i) one opposing high hydraulic efficiency to drought resistance, related to a wood economic spectrum; and (ii) the other opposing resource acquisition to resource conservation, related to a leaf economic spectrum. {A}cross landscapes, species with drought resistance strategies were favoured at lower precipitation. {W}ithin landscapes, drought resistant species were selected under low {TWI} in the dry landscape, while low {TWI} increased the abundance of species with conservative strategies in the wet landscape. {C}onclusions {P}recipitation and topography jointly shape the functional composition of tree communities. {A}t low precipitation, hydric constraints prevailed on ridges and upslopes by filtering drought resistant strategies along the wood economic spectrum. {C}ontrastingly, higher precipitation relaxed the hydric constraints and resource availability became a primary driver of changing strategies along the leaf economic spectrum. {T}hus, the landscape scale influence of topography on processes driving community assembly and functional composition critically depends on the regional climatic context.},
  keywords = {economic spectrum ; environmental filtering ; {N}ew {C}aledonia ; precipitation ; topography ; tree community ; water availability ; {NOUVELLE} {CALEDONIE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {V}egetation {S}cience},
  volume = {30},
  numero = {5},
  pages = {845--856},
  ISSN = {1100-9233},
  year = {2019},
  DOI = {10.1111/jvs.12781},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077071},
}