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Fire-mediated germination syndromes in Leucadendron (Proteaceae) and their functional correlates.
Newton, Rosemary J; Mackenzie, Berin D E; Lamont, Byron B; Gomez-Barreiro, Pablo; Cowling, Richard M; He, Tianhua.
Afiliação
  • Newton RJ; Conservation Science, Royal Botanic Gardens Kew, Wakehurst, Ardingly, West Sussex, RH17 6TN, UK. r.newton@kew.org.
  • Mackenzie BDE; Science Division, NSW Department of Planning, Industry and Environment, Locked Bag 5022, Parramatta, NSW, 2124, Australia.
  • Lamont BB; Centre for Ecosystem Science, University of New South Wales, Kensington, NSW, 2052, Australia.
  • Gomez-Barreiro P; Ecology Section, School of Molecular and Life Sciences, Curtin University, PO Box U1987, Perth, WA, 6845, Australia.
  • Cowling RM; Conservation Science, Royal Botanic Gardens Kew, Wakehurst, Ardingly, West Sussex, RH17 6TN, UK.
  • He T; Department of Botany, Nelson Mandela Metropolitan University, PO Box 7700, Port Elizabeth, 6000, South Africa.
Oecologia ; 196(2): 589-604, 2021 Jun.
Article em En | MEDLINE | ID: mdl-34159425
A mechanistic understanding of fire-driven seedling recruitment is essential for effective conservation management of fire-prone vegetation, such as South African fynbos, especially with rare and threatened taxa. The genus Leucadendron (Proteaceae) is an ideal candidate for comparative germination studies, comprising 85 species with a mixture of contrasting life-history traits (killed by fire vs able to resprout; serotinous vs geosporous) and seed morphologies (nutlets vs winged achenes). Individual and combined effects of heat and smoke on seed germination of 40 species were quantified in the laboratory, and Bayesian inference applied to distinguish biologically meaningful treatment effects from non-zero, but biologically trivial, effects. Three germination syndromes were identified based on whether germination was dependent on, enhanced by, or independent of direct fire cues (heat and smoke). Seed storage location was the most reliable predictor of germination syndromes, with soil-stored seeds c. 80% more likely to respond to direct fire cues (primarily smoke) than canopy-stored seeds. Notable exceptions were L. linifolium, with an absolute requirement for smoke to germinate (the third serotinous species so reported), and two other serotinous species with smoke-enhanced germination. Nutlet-bearing species, whether serotinous or geosporous, were c. 70% more likely to respond to fire cues than winged seeds, but there was no evidence for an effect of phylogeny or persistence strategy on germination. This comprehensive account of seed germination characteristics and identification of germination syndromes and their predictors, supports propagation, conservation and restoration initiatives in this iconic fynbos genus and other fire-prone shrubs with canopy or soil-stored seeds.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Proteaceae / Incêndios Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Proteaceae / Incêndios Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article