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Titolo:
Cover versus biomass as an estimate of species abundance: does it make a difference to the conclusions?
Autore:
Chiarucci, A; Wilson, JB; Anderson, BJ; De Dominicis, V;
Indirizzi:
Univ Siena, Dipartimento Biol Ambientale, I-53100 Siena, Italy Univ SienaSiena Italy I-53100 nto Biol Ambientale, I-53100 Siena, Italy Univ Otago, Dept Bot, Dunedin, New Zealand Univ Otago Dunedin New Zealand iv Otago, Dept Bot, Dunedin, New Zealand
Titolo Testata:
JOURNAL OF VEGETATION SCIENCE
fascicolo: 1, volume: 10, anno: 1999,
pagine: 35 - 42
SICI:
1100-9233(199902)10:1<35:CVBAAE>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMMUNITY STRUCTURE; DOMINANCE DIVERSITY; PATTERNS; EXPLANATION; EVENNESS;
Keywords:
biodiversity; relative abundance distribution; resource partitioning; sampling method; species abundance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Chiarucci, A Univ Siena, Dipartimento Biol Ambientale, Via PA Mattioli 4, I-53100 Siena, Univ Siena Via PA Mattioli 4 Siena Italy I-53100 3100 Siena,
Citazione:
A. Chiarucci et al., "Cover versus biomass as an estimate of species abundance: does it make a difference to the conclusions?", J VEG SCI, 10(1), 1999, pp. 35-42

Abstract

Different measures of species abundance, particularly cover and biomass, are often used as if they were interchangeable. We ask to what extent the measure of abundance affects conclusions reached in plant community ecology. The test data comprised 35 plots, each 1 m x 1 m, on serpentine vegetation in Tuscany, Italy, in which both cover and biomass were measured. The measure of abundance used made rather little difference when plots were examinedin terms of the rank abundance of the species present, and little difference to the results of a DCA-ordination. Likewise, species showed similar variation across plots in cover as in biomass. In calculating species diversity, agreement between measures of abundance was lower, but still good. For evenness, the correlation between cover and biomass results was lower again,though more so with some indices than with others. For the shape of the RAD (Relative Abundance Distribution), cover and biomass gave quite differentresults, the Zipf-Mandelbrot RAD model most commonly giving the best fit to the cover data, but the General lognormal model to the biomass data. These tendencies can be related to the intrinsic characteristics of cover and biomass as measures of abundance. The parameters of the model fits also differed between abundance measures. We conclude that the importance of using biomass as the measure of abundance depends on the ecological feature being examined. The difference between the two measures may be greater in other vegetation; very little information is available. In the current state of knowledge it is dangerous to use another measure as a surrogate for biomass.

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Documento generato il 21/09/20 alle ore 18:52:03