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Titolo:
Population dynamics of the annual plant Senecio vulgaris in ruderal and agricultural habitats
Autore:
Leiss, KA; Muller-Scharer, H;
Indirizzi:
Univ Fribourg, Dept Biol, CH-1700 Fribourg, Switzerland Univ Fribourg Fribourg Switzerland CH-1700 CH-1700 Fribourg, Switzerland
Titolo Testata:
BASIC AND APPLIED ECOLOGY
fascicolo: 1, volume: 2, anno: 2001,
pagine: 53 - 64
SICI:
1439-1791(2001)2:1<53:PDOTAP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
PATHOGEN PUCCINIA-LAGENOPHORAE; BIOLOGICAL WEED-CONTROL; SIZE HIERARCHIES; RUST INFECTION; COMPETITION; FIELD; REPRODUCTION; ASTERACEAE; MANAGEMENT; STRATEGY;
Keywords:
biological weed control; demography; pathogen;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Muller-Scharer, H Univ Fribourg, Dept Biol, CH-1700 Fribourg, Switzerland Univ Fribourg Fribourg Switzerland CH-1700 Switzerland
Citazione:
K.A. Leiss e H. Muller-Scharer, "Population dynamics of the annual plant Senecio vulgaris in ruderal and agricultural habitats", BASIC AP EC, 2(1), 2001, pp. 53-64

Abstract

The annual plant Senecio vulgaris has migrated from ruderal to agricultural habitats resulting in weed populations. The population dynamics of S. vulgaris and its naturally associated rust fungus Puccinia lagenophorae were investigated as a basis for the biological control of S. vulgaris with the rust. A detailed basic study at a single ruderal site and a parallel investigation at each five ruderal and five agricultural sites were conducted fromApril to November 1997. During the whole period of study the spatial distribution of plants was aggregated and plants showed a relatively large size hierarchy as indicated by mean values of the Gini coefficient higher than 0.5. Seedling establishment appeared to be a major factor influencing the dynamics of S. Vulgaris. The importance of seedling establishment, together with the observed short generation time of 5 weeks and the broad range of plant sizes at reproduction classifies S. vulgaris as a ruderal strategist. The population dynamics of S. vulgaris differed between the ruderal and the agricultural habitat. Plants of S. vulgaris at the ruderal habitat survivedover winter, resulting in greater population sizes (0.1 to 1 of the maximum) and a majority of plants in flower and seed set (31.9%) in spring. At the agricultural habitat, where only a few S. vulgaris winter due to weed control measures, population sizes in spring were smaller (0 to 0.16 of the maximum) with mainly vegetative plants (66.7%). The limited number of suitable hosts at the agricultural habitat in spring lead to a delay of rust infection until August, in contrast to the ruderal habitat where the rust was already present in April. In both habitats mature plant stages were more susceptible to rust infection than vegetative stages. Manipulating the dynamicsof the host over winter may enhance rust epidemics in spring serving as biological control of S. vulgaris.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:34:39