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Titolo:
A test of community reassembly using the exotic communities of New Zealandroadsides in comparison to British roadsides
Autore:
Wilson, JB; Steel, JB; Dodd, ME; Anderson, BJ; Ullmann, I; Bannister, P;
Indirizzi:
Univ Otago, Dept Bot, Dunedin, New Zealand Univ Otago Dunedin New Zealand iv Otago, Dept Bot, Dunedin, New Zealand Open Univ, Dept Biol, Milton Keynes MK7 6AA, Bucks, England Open Univ Milton Keynes Bucks England MK7 6AA nes MK7 6AA, Bucks, England Univ Wurzburg, Lehrstuhl Bot 2, D-97082 Wurzburg, Germany Univ Wurzburg Wurzburg Germany D-97082 Bot 2, D-97082 Wurzburg, Germany
Titolo Testata:
JOURNAL OF ECOLOGY
fascicolo: 5, volume: 88, anno: 2000,
pagine: 757 - 764
SICI:
0022-0477(200010)88:5<757:ATOCRU>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHERN NEW-ZEALAND; ECOLOGICAL COMMUNITIES; PLANT-COMMUNITIES; VEGETATION; PATTERNS; CLASSIFICATION; CONVERGENCE; STATES; ISLAND;
Keywords:
alternative stable states; assembly rules; community reassembly; deterministic structure; exotic species; Humpty Dumpty effect; invasion; NVC; pre-adaptation; roadside; stochastic model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Wilson, JB Univ Otago, Dept Bot, POB 56, Dunedin, New Zealand Univ Otago POB 56 Dunedin New Zealand 6, Dunedin, New Zealand
Citazione:
J.B. Wilson et al., "A test of community reassembly using the exotic communities of New Zealandroadsides in comparison to British roadsides", J ECOLOGY, 88(5), 2000, pp. 757-764

Abstract

1 Competing theories of community assembly are very difficult to test. Four main theories exist. The Stochastic theory sees species assembly as beingrandom. The Humpty Dumpty/Alternative Stable States (ASS) theory suggests that a community may be unable to reassemble itself from its constituent species. The Deterministic theory suggests there will be convergence to one stable state. The Pre-adaptation theory is similar to the Deterministic theory but emphasizes that many species fit the stable state because of characters acquired elsewhere.2 The reassembly of a flora into new communities in a different country, or its assimilation as a major component of such communities, offers a meansto test these theories. The invasion of British plant species into New Zealand, and their reassembly into roadside communities there, is a good example of such a natural experiment.3 Plant communities of NZ roadsides were compared to the communities of the British National Vegetation Classification (NVC). British roadside communities were also compared to the NVC as a control. New Zealand roadside communities provided a fit to the NVC communities of only 54.7% on average. After excluding species that are not present in NZ, and therefore could not possibly reassemble, the fit increased to 61.1%. British roadsides gave a 65.8% fit. The NZ figures are similar to the fit obtained with random data (58.7%), indicating that the NZ communities bear little relation to the ones formed by the same species in Britain.4 Similarity between roadside communities in NZ and Britain was low, forming two almost distinct sets of communities.5 Some of the predictions of the Stochastic, Humpty Dumpty/ASS and Deterministic models are borne out, but others are not. It is concluded that British species have reassembled into communities in NZ most of which are new, i.e. distinct from those that occur in the native range of the species in Britain. The evidence points to a process of community assembly by pre-adaptation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 12:28:47