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Environmental correlates for tree occurrences, species distribution and richness on a high-elevation tropical island.

Birnbaum P, Ibanez T, Pouteau R, Vandrot H, Hequet V, Blanchard E, Jaffré T - AoB Plants (2015)

Bottom Line: The observed species richness was driven mainly by the density of occurrences.However, at the highest elevations or rainfalls, and particularly on UM, the observed richness tends to be lower, independently of the sampling effort.Projected onto a map, under-represented areas are a guide as to where future sampling efforts are most required to complete our understanding of rainforest tree species distribution.

View Article: PubMed Central - PubMed

Affiliation: CIRAD, UMR 51 AMAP, 34398 Montpellier, France Laboratory of Applied Botany and Plant Ecology, Institut Agronomique néo-Calédonien (IAC), Diversité biologique et fonctionnelle des écosystèmes terrestes, 98848 Noumea, New Caledonia birnbaum@cirad.fr.

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Relative density distributions of land area (A and C) and tree occurrences (B and D) on UM substrate (A and B) and non-UM substrates (C and D) along the rainfall and elevation gradients.
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PLV075F2: Relative density distributions of land area (A and C) and tree occurrences (B and D) on UM substrate (A and B) and non-UM substrates (C and D) along the rainfall and elevation gradients.

Mentions: Overall, tree occurrences covered most of the elevation—­rainfall combinations available on both UM and non-UM substrates (Fig. 2). As a result, we observed a significant correlation between the number of occurrences and the available rainforest area along the elevation gradient (R2 = 0.71 on UM and 0.64 on non-UM, P-value <0.001 in both cases). This correlation was weaker along the rainfall gradient (R2 = 0.45 on UM and 0.34 on non-UM, P-value <0.01 and 0.05, respectively, Table 2).Table 2.


Environmental correlates for tree occurrences, species distribution and richness on a high-elevation tropical island.

Birnbaum P, Ibanez T, Pouteau R, Vandrot H, Hequet V, Blanchard E, Jaffré T - AoB Plants (2015)

Relative density distributions of land area (A and C) and tree occurrences (B and D) on UM substrate (A and B) and non-UM substrates (C and D) along the rainfall and elevation gradients.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4561634&req=5

PLV075F2: Relative density distributions of land area (A and C) and tree occurrences (B and D) on UM substrate (A and B) and non-UM substrates (C and D) along the rainfall and elevation gradients.
Mentions: Overall, tree occurrences covered most of the elevation—­rainfall combinations available on both UM and non-UM substrates (Fig. 2). As a result, we observed a significant correlation between the number of occurrences and the available rainforest area along the elevation gradient (R2 = 0.71 on UM and 0.64 on non-UM, P-value <0.001 in both cases). This correlation was weaker along the rainfall gradient (R2 = 0.45 on UM and 0.34 on non-UM, P-value <0.01 and 0.05, respectively, Table 2).Table 2.

Bottom Line: The observed species richness was driven mainly by the density of occurrences.However, at the highest elevations or rainfalls, and particularly on UM, the observed richness tends to be lower, independently of the sampling effort.Projected onto a map, under-represented areas are a guide as to where future sampling efforts are most required to complete our understanding of rainforest tree species distribution.

View Article: PubMed Central - PubMed

Affiliation: CIRAD, UMR 51 AMAP, 34398 Montpellier, France Laboratory of Applied Botany and Plant Ecology, Institut Agronomique néo-Calédonien (IAC), Diversité biologique et fonctionnelle des écosystèmes terrestes, 98848 Noumea, New Caledonia birnbaum@cirad.fr.

No MeSH data available.


Related in: MedlinePlus