Accelerated seedling emergence in interspecific competitive neighbourhoods

Citation
Ar. Dyer et al., Accelerated seedling emergence in interspecific competitive neighbourhoods, ECOL LETT, 3(6), 2000, pp. 523-529
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ECOLOGY LETTERS
ISSN journal
1461-023X → ACNP
Volume
3
Issue
6
Year of publication
2000
Pages
523 - 529
Database
ISI
SICI code
1461-023X(200011)3:6<523:ASEIIC>2.0.ZU;2-H
Abstract
Seed dormancy models suggest that evaluation of environmental conditions sh ould influence the decision to germinate and that waiting for more favourab le conditions may increase potential fitness. However, because rapid emerge nce is often positively correlated with performance and survival, an altern ative strategy to accelerate the rate of emergence may increase the potenti al for site pre-emption. This response is more likely to be found in season al environments with greater potential for rapid resource depletion in whic h early emergence may confer a competitive advantage. The experiments repor ted here found more rapid emergence in a perennial grass species when it wa s planted in potentially highly competitive interspecific neighbourhoods. T his response suggests an inherent ability in seeds of this species to sense and respond to the competitive nature of the immediate neighbourhood.