@article{fdi:010065370,
  title = {{A}ccounting for the indirect area effect in stacked species distribution models to map species richness in a montane biodiversity hotspot},
  author = {{P}outeau, {R}obin and {B}ayle, {E}. and {B}lanchard, {E}lodie and {B}irnbaum, {P}. and {C}assan, {J}. {J}. and {H}equet, {V}anessa and {I}banez, {T}. and {V}androt, {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}im {U}nderstanding how species richness is distributed is a critical prerequisite to implement efficient conservation strategies in biodiversity hotspots. {S}tacked species distribution models ({S}-{SDM}s) provide new opportunities to map species richness, but the accuracy of this method may decline with elevation. {H}ere, we test whether variation in model accuracy arises from increasingly unpredictable environments or the decreasing availability of area with increasing elevation, which might affect the regional pool of species and, as a result, the local species richness (the indirect area effect). {L}ocation {T}he {N}ew {C}aledonian biodiversity hotspot (south-west {P}acific {O}cean). {M}ethods {A}n individual {MAXENT} model was built for 562 tree species by combining eight 100-m resolution environmental variables with c.10,000 occurrence records. {F}or each species, a map was produced at a one-hectare scale indicating the estimated habitat suitability. {A}ll models were then summed, and the resulting estimates were compared with richness measured in 11 independent one-hectare inventories. {T}o account for the indirect area effect, {S}-{SDM} estimates were adjusted through the {A}rrhenius' equation linking the number of species hosted by a habitat with its surface area. {R}esults {T}he {S}-{SDM} predictions ranged from 95 to 251 species (mean=153) while field inventories were lower, ranging from 39 to 131 species (mean=90). {O}verall, the {S}-{SDM} increasingly overestimated richness as elevation increased. {T}aking into account the indirect area effect de-correlated residuals from elevation and induced a significant correlation between modelled and measured species richness. {C}onclusion {T}he decreasing accuracy of the {S}-{SDM} with elevation was explained by the decreasing availability of habitat influencing regional diversity found in each elevational band. {D}espite remaining difficulties to predict species richness when addressing the indirect area effect, our findings represent a significant step forward towards improved {S}-{SDM} designing.},
  keywords = {{A}lpha diversity ; biodiversity mapping ; gamma diversity ; herbarium data ; mountain ecology ; tropical rain forest ; {NOUVELLE} {CALEDONIE}},
  booktitle = {},
  journal = {{D}iversity and {D}istributions},
  volume = {21},
  numero = {11},
  pages = {1329--1338},
  ISSN = {1366-9516},
  year = {2015},
  DOI = {10.1111/ddi.12374},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065370},
}