NDLI: Interactions, Environmental Sorting and Chance: Phylostructure of a Tropical Forest Assembly

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Interactions, Environmental Sorting and Chance: Phylostructure of a Tropical Forest Assembly

Content Provider	Springer Nature Link
Author	Gastauer, Markus Meira Neto, João Augusto Alves
Copyright Year	2013
Abstract	Density dependence, environmental sorting and chance have been discussed for the purpose of understanding, predicting and explaining the species richness, composition and structural parameters of living communities. Different ecological mechanisms occur individually in an overlapping manner, so the structure of each local community is influenced by an independent mixture of these factors. To identify which of these factors prevails in organizing the species-rich tree community from 100 plots of 10 × 10 m in a primary forest patch (the Forest of Seu Nico – FSN, from the Atlantic Forest domain), we analyzed species-environment correlations via canonical correspondence analysis and identified two different pedo-environments. We analyzed the community’s phylogenetic structure using Phylocom 4.2 software to calculate the net relatedness index (NRI) and the nearest taxon index (NTI). Furthermore, we partitioned the total phylogenetic diversity into independent α and β components (Π$_{ST}$). To reveal the overlap of ecological mechanisms such as neutrality, environmental filtering and density-dependent factors, we analyzed the phylogenetic structure in both pedo-environments. The species-environment correlations observed in the FSN are weak in comparison with those found in other studies, although the permanent plot presents a short environmental gradient, dividing the plot into an upper, more acidic hillside and a lower, more fertile bottom. The overall phylogenetic structure of the FSN community shows strong and significant phylogenetic overdispersion. This overdispersion indicates that density-dependent factors, such as interspecific competition, play an important role in maintaining the species richness and community structure in megadiverse ecosystems such as the FSN when we assume traits to be conserved within evolutionary lineages. The NRI and NTI are correlated positively with the soil pH and negatively with the soil’s aluminum concentration, so the bottom plots show higher phylogenetic overdispersion and lower Π$_{ST}$ values than the hillside plots. This pattern can be explained by the greater importance of environmental filters in more acidic soils that form less favorable habitats, while the influence of competition and therefore also the rate of competitive exclusion are higher in the more favorable, less acidic plots.
Starting Page	443
Ending Page	459
Page Count	17
File Format	PDF
ISSN	12119520
Journal	Folia Geobotanica
Volume Number	49
Issue Number	3
e-ISSN	18749348
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-12-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Assembly rules Atlantic forest Competitive exclusion Environmental gradients Phylogenetic structure Species-environment correlations Plant Systematics/Taxonomy/Biogeography Plant Ecology Plant Sciences Life Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Paleontology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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