Limits...
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.

No MeSH data available.


Related in: MedlinePlus

Distribution of observed and theoretical γ-diversities, the density of rainforest area and the density of tree occurrences on UM substrates (A and B) and non-UM substrates (C and D) along the elevation and rainfall gradients.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4561634&req=5

PLV075F4: Distribution of observed and theoretical γ-diversities, the density of rainforest area and the density of tree occurrences on UM substrates (A and B) and non-UM substrates (C and D) along the elevation and rainfall gradients.

Mentions: Overall, the α-diversity (i.e. the total number of species per 1-min cell) was strongly correlated with the total number of occurrences (Pearson's correlation test, R2 = 0.86, P-value <0.001). The observed γ-diversity was strongly log-correlated with the number of occurrences, regardless of the substrate type or the environmental gradient (R2 > 0.90 and P-value <0.001 in all cases, Table 2). Furthermore, the observed γ-diversity was also strongly log-correlated with the theoretical γ-diversity (R2 > 0.97, P-value <0.001) except along the elevation gradient on non-UM substrates, where the correlation was weaker (R2 = 0.82, P-value <0.001, Table 2). Nevertheless we observed important differences between observed and theoretical γ-diversity at mid-elevation and rainfall (Fig. 4). We note that along the elevation gradient, the highest γ-diversity on UM substrates was recorded at low elevation despite a low density of occurrences. Conversely, at high elevations and high rainfalls, occurrences were dense, so the γ-diversity observed deviated from the available area.Figure 4.


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)

Distribution of observed and theoretical γ-diversities, the density of rainforest area and the density of tree occurrences on UM substrates (A and B) and non-UM substrates (C and D) along the elevation and rainfall gradients.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

PLV075F4: Distribution of observed and theoretical γ-diversities, the density of rainforest area and the density of tree occurrences on UM substrates (A and B) and non-UM substrates (C and D) along the elevation and rainfall gradients.
Mentions: Overall, the α-diversity (i.e. the total number of species per 1-min cell) was strongly correlated with the total number of occurrences (Pearson's correlation test, R2 = 0.86, P-value <0.001). The observed γ-diversity was strongly log-correlated with the number of occurrences, regardless of the substrate type or the environmental gradient (R2 > 0.90 and P-value <0.001 in all cases, Table 2). Furthermore, the observed γ-diversity was also strongly log-correlated with the theoretical γ-diversity (R2 > 0.97, P-value <0.001) except along the elevation gradient on non-UM substrates, where the correlation was weaker (R2 = 0.82, P-value <0.001, Table 2). Nevertheless we observed important differences between observed and theoretical γ-diversity at mid-elevation and rainfall (Fig. 4). We note that along the elevation gradient, the highest γ-diversity on UM substrates was recorded at low elevation despite a low density of occurrences. Conversely, at high elevations and high rainfalls, occurrences were dense, so the γ-diversity observed deviated from the available area.Figure 4.

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