Patterns of Plant Species Richness Within Families and Genera in Lowland Neotropical Forests: Are Similarities Related to Ecological Factors or to Chance?

Stevenson, Pablo R.; Castellanos, María Clara; Agudelo, T Juliana

doi:10.5772/31987

Cited by 1 publication

(1 citation statement)

References 56 publications

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“…According to our results, Fabaceae was the richest family (79 species, 20.57%) in the igapó and várzea (Albernaz et al, 2012), terra firme (Emidio and Bignoniaceae) and that this similarity could be explained by the common origin of the most important families, which underwent differentiation long before the separation of Gondwana land (Gentry, 1982). Stevenson, Castellanos, and Agudelo (2012) noted that the floristic affinities at the familial and generic levels showed significant correlations with the number of dry months or the duration of the dry season, independent of geographic distance, and observed a minor effect of stochastic factors.…”

Section: Species Richness and Dominancementioning

confidence: 53%

Distribution and β‐diversity of tree species in igapó forests (Negro River basin, Brazilian Amazon)

Scudeller

Vegas‐Vilarrúbia

2018

J Vegetation Science

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Questions How are the tree species of the periodically flooded black water forest distributed along the Negro River basin (igapó)? Can we classify the tree communities into similarity groups? Are oligarchic species present? Methods We analysed available data on tree species composition in vegetation plots located in the Negro River basin (igapó forests) in Brazil and built a similarity matrix based on Sørensen's similarity index. We applied principal coordinates analysis, established community groups (a posteriori) and applied both multi‐response permutation procedures and indicator species analysis. Results Among 19 surveys conducted in igapó forests, at least 604 woody taxa were recognized, and 384 taxa were identified to species level. Igapó tree species were not as frequent or abundant as were other tree species of the Amazon upland forest, although they were widely distributed in other forest types. The Sørensen similarity index was low (Ss = 0.16). Generally, the highest similarity values were recorded between surveys that were spatially close. The multivariate analyses suggested the existence of a strong vegetation gradient along the Negro River. The two groups established a posteriori showed 25 species with an indicator value (IV) >50%, and 68 species presented IndValues in both groups. Conclusions Our results show a strong turnover of tree species replacement along the course of the Negro River, with 57.5% of species restricted to one survey of occurrence. This trend is particularly notable from the point at which the Branco River strongly discharges into the Negro River. No species show high values for range distribution or local abundance, although four were considered moderately frequent. The upper parts of the main rivers have indicator species that are less frequent downstream.

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Section: Species Richness and Dominancementioning

confidence: 53%