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Titolo:
ARE THERE ASSEMBLY RULES FOR PLANT-SPECIES ABUNDANCE - AN INVESTIGATION IN RELATION TO SOIL RESOURCES AND SUCCESSIONAL TRENDS
Autore:
WILSON JB; WELLS TCE; TRUEMAN IC; JONES G; ATKINSON MD; CRAWLEY MJ; DODD ME; SILVERTOWN J;
Indirizzi:
94 HIGH ST UPWOOD PE17 1QE CAMBS ENGLAND UNIV OTAGO,DEPT BOT DUNEDIN NEW ZEALAND INST TERR ECOL HUNTINGDON PE17 2LS CAMBS ENGLAND WOLVERHAMPTON UNIV,SCH PURE & APPL SCI WOLVERHAMPTON WV1 1SB ENGLAND UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT PURE & APPL BIOL ASCOT SL5 7PY BERKS ENGLAND OPEN UNIV,DEPT BIOL MILTON KEYNES MK7 6AA BUCKS ENGLAND
Titolo Testata:
Journal of Ecology
fascicolo: 4, volume: 84, anno: 1996,
pagine: 527 - 538
SICI:
0022-0477(1996)84:4<527:ATARFP>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMMUNITY STRUCTURE; DOMINANCE DIVERSITY; FLORISTIC RICHNESS; EVENNESS; COMPETITION; ECOSYSTEMS; PATTERNS; MODELS;
Keywords:
ABUNDANCE; ASSEMBLY RULES; COMMUNITY STRUCTURE; DOMINANCE/DIVERSITY; EVENNESS; GRASSLAND; RANK CONSISTENCY; SUCCESSION; VEGETATION RESTORATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
J.B. Wilson et al., "ARE THERE ASSEMBLY RULES FOR PLANT-SPECIES ABUNDANCE - AN INVESTIGATION IN RELATION TO SOIL RESOURCES AND SUCCESSIONAL TRENDS", Journal of Ecology, 84(4), 1996, pp. 527-538

Abstract

1 The distribution of relative abundances between the species of a plant community has been remarkably little analysed. We examine differences in relative abundance distribution (RAD) between different soil fertility levels, and trends through time in the development of a community, using data from three grassland experiments: Monks Wood grasslandrestoration, Park Grass long-term fertilizer trial and Compton grassland restoration. 2 Comparing plots with different fertilizer treatments, the evenness of plant species abundance was higher where phosphorushad been applied; other effects of soil fertility on evenness were inconsistent. There were no consistent effects of soil fertility on the relative fit of the Geometric, General Lognormal and Zipf-Mandelbrot models of RAD, contrary to previous theories, However, the Broken Stickmodel fitted relatively better, though still poorly in absolute terms, in plots with high species richness and where phosphorus had been applied. Parameter gamma of the General Log-normal distribution was higher in the high-nitrogen and species-poor plots, disproving the theory that gamma should be constant, Parameter beta of the Zipf-Mandelbrot model was higher in more species-rich and in high-phosphorus plots, a result not predicted in the literature. The variation in gamma and betaseems to be largely a reflection of the variation in evenness and in species dominance. The consistency in species dominance across space (rank consistency) was higher in plots with phosphorus addition. It is concluded that resource availability had little effect on which model of community assembly fitted, However, under high phosphorus conditions the community was more spatially consistent, and there was less dominance. 3 Through time, the evenness of species abundances increased, consistently between two separate experiments, Examining the shape of the abundance distribution at a more detailed level, there were no timetrends in which relative abundance model fitted best, except that thefit of the Broken Stick model became less poor, However, the shape ofthe General Log-normal and Zipf-Mandelbrot curves, as seen in indicesgamma and beta, respectively, changed through time, consistently between two separate experiments, supporting the implication from increased evenness of increasing niche diversification. Rank consistency increased in the early years of succession, then decreased, supporting the Three-phase succession model of Gitay & Wilson (1995), in which a middle 'building' phase has higher rank consistency than the preceding 'pioneer' phase or the succeeding 'mature' phase.

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Documento generato il 19/09/20 alle ore 09:03:51