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A new measure of functional evenness and some of its properties.

Ricotta C, Bacaro G, Moretti M - PLoS ONE (2014)

Bottom Line: Nonetheless, in spite of its relevant role for ecosystem functioning, only a few measures of functional evenness have been proposed.In this paper we introduce a new measure of functional evenness that reflects the regularity in the distribution of species abundances, together with the evenness in their pairwise functional dissimilarities.To show how the proposed measure works, we focus on changes in functional evenness calculated from Grime's classification of plant strategies as competitors (C), stress-tolerators (S) and ruderals (R) along a post-fire successional gradient in temperate chestnut forests of southern Switzerland.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Biology, University of Rome 'La Sapienza', Rome, Italy.

ABSTRACT
Functional evenness is increasingly considered an important facet of functional diversity that sheds light on the complex relationships between community assembly and ecosystem functioning. Nonetheless, in spite of its relevant role for ecosystem functioning, only a few measures of functional evenness have been proposed. In this paper we introduce a new measure of functional evenness that reflects the regularity in the distribution of species abundances, together with the evenness in their pairwise functional dissimilarities. To show how the proposed measure works, we focus on changes in functional evenness calculated from Grime's classification of plant strategies as competitors (C), stress-tolerators (S) and ruderals (R) along a post-fire successional gradient in temperate chestnut forests of southern Switzerland.

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Correlation plots between functional evenness RU and the time since last fire.R2  =  0.306; p<0.05 (two-tailed test, 9999 randomizations).
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pone-0104060-g002: Correlation plots between functional evenness RU and the time since last fire.R2  =  0.306; p<0.05 (two-tailed test, 9999 randomizations).

Mentions: Post-fire vegetation dynamics was characterized by a significant decrease of the ruderal component along the successional gradient (Figure 1). At early successional stages (<10 years after fire), the contribution of the ruderal component to the average community functional spectrum was 9.2% (C:S:R  =  51.5%:39.3%:9.2%; mean of eight plots). At later-successional stages (≥10 years after fire), ruderal species decreased to 3.5% (C:S:R  =  53.8%:42.7%:3.5%; 12 plots). The observed decrease in the ruderal component during the post-fire vegetation recovery is associated with a moderate, though significant decrease of functional evenness with the time since last fire (R2  =  0.306, p < 0.05; see Figure 2).


A new measure of functional evenness and some of its properties.

Ricotta C, Bacaro G, Moretti M - PLoS ONE (2014)

Correlation plots between functional evenness RU and the time since last fire.R2  =  0.306; p<0.05 (two-tailed test, 9999 randomizations).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126696&req=5

pone-0104060-g002: Correlation plots between functional evenness RU and the time since last fire.R2  =  0.306; p<0.05 (two-tailed test, 9999 randomizations).
Mentions: Post-fire vegetation dynamics was characterized by a significant decrease of the ruderal component along the successional gradient (Figure 1). At early successional stages (<10 years after fire), the contribution of the ruderal component to the average community functional spectrum was 9.2% (C:S:R  =  51.5%:39.3%:9.2%; mean of eight plots). At later-successional stages (≥10 years after fire), ruderal species decreased to 3.5% (C:S:R  =  53.8%:42.7%:3.5%; 12 plots). The observed decrease in the ruderal component during the post-fire vegetation recovery is associated with a moderate, though significant decrease of functional evenness with the time since last fire (R2  =  0.306, p < 0.05; see Figure 2).

Bottom Line: Nonetheless, in spite of its relevant role for ecosystem functioning, only a few measures of functional evenness have been proposed.In this paper we introduce a new measure of functional evenness that reflects the regularity in the distribution of species abundances, together with the evenness in their pairwise functional dissimilarities.To show how the proposed measure works, we focus on changes in functional evenness calculated from Grime's classification of plant strategies as competitors (C), stress-tolerators (S) and ruderals (R) along a post-fire successional gradient in temperate chestnut forests of southern Switzerland.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Biology, University of Rome 'La Sapienza', Rome, Italy.

ABSTRACT
Functional evenness is increasingly considered an important facet of functional diversity that sheds light on the complex relationships between community assembly and ecosystem functioning. Nonetheless, in spite of its relevant role for ecosystem functioning, only a few measures of functional evenness have been proposed. In this paper we introduce a new measure of functional evenness that reflects the regularity in the distribution of species abundances, together with the evenness in their pairwise functional dissimilarities. To show how the proposed measure works, we focus on changes in functional evenness calculated from Grime's classification of plant strategies as competitors (C), stress-tolerators (S) and ruderals (R) along a post-fire successional gradient in temperate chestnut forests of southern Switzerland.

Show MeSH