e-journal

Functional traitmetrics are sensitive to the completeness of the species’ trait data?

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1. Functional diversity (FD) is an important concept for studies of both ecosystem processes and community
assembly, so it is important to understand the behaviour of common metrics used to express it.
2. Data from an existing study of the relationship between FD and environmental drivers were used to simulate
the impact of a progressive failure to measure the traits of all the species present under three scenarios: intraspecific variation between sites ignored (i), assessed (ii) or (iii) ignored but with metrics calculated at the sampling unit rather than the site level.
3. All the FD metrics were highly sensitive to failing to measure the traits of all the species present. Functional
dispersion, functional richness and Rao’s entropy all generally declined with a reduced proportion of species or
cover assessed for traits, whilst functional divergence and evenness increased for some sites and decreased for
others. Functional richness was the most sensitive (mean absolute deviation at 70% of species assessed had a
range of 11
2–28
2% across scenarios), followed by functional evenness (range 6
4–38
5%), functional divergence
(5
2–8
3%),Rao’s entropy (1
4–7
0%) and functional dispersion (0
7–3
5%).
4. It is clear that failing to measure the traits of all species at a site can have a serious impact on the value of any functional trait metric computed and on any conclusions drawn from such data. Future studies of FD need to
concentrate on the potential impact of the sampling regime of both traits and species and the scale at which the
computations aremade on the behaviour of metrics and subsequent robustness of the results.

Key-words: functional dispersion, functional divergence, functional evenness, functional richness,
plant functional traits,Rao’s entropy, trait sampling

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Ketersediaan

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Informasi Detail

Judul Seri

Methods in Ecology and Evolution

No. Panggil

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Penerbit

: British Ecological Society., 2014

Deskripsi Fisik

Methods in Ecology and Evolution 2014, 5, 9–15

Bahasa

English

ISBN/ISSN

doi: 10.1111/2041-21

Klasifikasi

-

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

-

Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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