Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
RELATIVE ABUNDANCE DISTRIBUTIONS IN PLANT-COMMUNITIES - EFFECTS OF SPECIES RICHNESS AND OF SPATIAL SCALE
Autore:
WILSON JB; GITAY H; STEEL JB; KING WM;
Indirizzi:
UNIV OTAGO,DEPT BOT,POB 56 DUNEDIN NEW ZEALAND AUSTRALIAN NATL UNIV,INST ADV STUDIES,RSBS,ECOSYST DYNAM GRP CANBERRAACT 0200 AUSTRALIA CTR AGR RES & VET,AUSTRALIAN CTR WEED RES ORANGE NSW AUSTRALIA
Titolo Testata:
Journal of vegetation science
fascicolo: 2, volume: 9, anno: 1998,
pagine: 213 - 220
SICI:
1100-9233(1998)9:2<213:RADIP->2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASSEMBLY RULES; GUILD PROPORTIONALITY; DOMINANCE DIVERSITY; NICHE LIMITATION; NEW-ZEALAND; DUNE SLACK; VEGETATION; PATTERNS;
Keywords:
BROKEN STICK MODEL; COMMUNITY STRUCTURE; DUNE SLACK; GEOMETRIC DISTRIBUTION; LOGNORMAL DISTRIBUTION; NICHE PREEMPTION MODEL; SEMIARID GRASSLAND; SEQUENTIAL BREAKAGE MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
J.B. Wilson et al., "RELATIVE ABUNDANCE DISTRIBUTIONS IN PLANT-COMMUNITIES - EFFECTS OF SPECIES RICHNESS AND OF SPATIAL SCALE", Journal of vegetation science, 9(2), 1998, pp. 213-220

Abstract

Relative abundance distributions (RADs) are an important feature of community structure, but little is known of the factors affecting whichtype of RAD is observed in a particular community. We examined the influences of species richness and of spatial scale on the RAD of plant communities. The effect of species richness was examined by analysing simulated communities generated under the Broken stick model, the Sequential breakage model, and a randomized version of Niche pre-emption model. In all cases, when there were few species in the community the data only occasionally gave the best fit to the model that was used to generate it. With 40-65 species, a best fit was obtained for the correct model in about 75 % of cases, almost irrespective of the model. Effects of spatial scale were examined in data from four dune slacks and from two semi-arid grasslands, by analysing biomass values at a range of sample sizes. The model that best fitted the whole sample differed between the four slacks and between the slacks and the semi-arid grasslands. The change in which model of RAD fitted best, as sample size was reduced, varied between sites and between habitat types. At the smallest sample sizes, the Zipf-Mandelbrot model often fitted, and in the slack sites the Broken stick also, though neither fitted (in the vegetation examined) at larger spatial scales. It is concluded the RAD is affected by species richness and by spatial scale, in ways that currently do not enable simple prediction. RADs can theoretically give information on the processes such as resource partitioning, immigration and competition that have structured the community, but they are a blunt tool for this purpose.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/08/20 alle ore 19:16:32