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• W2093740382 abstract "1: Unravelling which factors affect where tropical trees grow is an important goal forecologists and conservationists. At the landscape scale, debate is mostly focused on thedegree to which the distributions of tree species are determined by soil conditions or byneutral, distance-dependent processes. Problems with spatial autocorrelation, sparsesoil sampling, inclusion of species-poor sites with extreme edaphic conditions, and thedifficulty of obtaining sufficient sample sizes have all complicated assessments for highdiversity tropical forests.2: We evaluated the extent and pervasiveness of habitat association of trees within a10 000 km2species-rich lowland landscape of uniform climate in south-west Amazonia.Forests growing on two non-flooded landscape units were inventoried using 88 floristicplots and detailed soil analyses, sampling up to 849 tree species. We applied singlespeciesand community-level analytical techniques (frequency-distributions of presencerecords, association analysis, indicator species analysis, ordination, Mantel correlations,and multiple regression of distance matrices) to quantify soil/floristic relationshipswhile controlling for spatial autocorrelation.3: Obligate habitat-restriction is very rare: among 230 tree species recorded in≥10localities only five (2.2%) were always restricted to one landscape unit or the other.4: However, many species show a significant tendency to habitat association. For example,using Monte Carlo randomization tests, of the 34 most dominant species across thelandscape the distributions of 26 (76.5%) are significantly related to habitat. We applieddensity-independent and frequency-independent estimates of habitat association andfound that rarer species tend to score higher, suggesting that our full community estimates ofhabitat association are still underestimated due to the inadequate sampling of rarer species.5: Community-level floristic variation across the whole landscape is related to thevariation in 14 of 16 measured soil variables, and to the geographical distances betweensamples.6: Multiple regression of distance matrices shows that 10% of the floristic variation canbe attributed to spatial autocorrelation, but even after accounting for this at least 40%is attributable to measured environmental variation.7: Our results suggest that substrate-mediated local processes play a much moreimportant role than distance-dependent processes in structuring forest composition inAmazonian landscapes." @default.
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• W2093740382 date "2003-09-19" @default.
• W2093740382 modified "2023-09-26" @default.
• W2093740382 title "Habitat association among Amazonian tree species: a landscape-scale approach" @default.
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• W2093740382 doi "https://doi.org/10.1046/j.1365-2745.2003.00815.x" @default.
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