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Delayed emergence and post-fire recruitment success: effects of seasonal germination, fire season and dormancy type

Journal Article


Abstract


  • Delayed seedling emergence can negatively affect plant recruitment. Recent work has shown that some species

    with innate seasonal requirements for germination can have seedling emergence delayed, depending on the season of fire. The

    impact of this delay, which is in relation to both resprouters and seedlings of species that emerge independent of season,

    remains unknown. I assessed delayed emergence and subsequent impacts on post-fire recruitment success of three

    Leucopogon species, which all display a seasonal emergence pattern related to their physiological dormancy. Intrapopulation

    comparisons showed that both small (1–6 months) and much larger (12–15 months) delays of emergence reduced

    seedling survival and growth, and increased the time taken for plants to reach maturity. Fire season induced delays produced

    very similar results, with higher mortality and slower growth after winter fires compared with post-summer fire cohorts.

    Seasonal emergence patterns, associated with seed dormancy and germination cues, may therefore provide a mechanism that

    determines the variation of recruitment success after fires in different seasons. A better understanding of the relationship

    between fire season and timing of emergence of physiologically dormant species would be timely considering the forecast

    widening of the fire season due to climate change.

Publication Date


  • 2010

Citation


  • Ooi, M. K. J. (2010). Delayed emergence and post-fire recruitment success: effects of seasonal germination, fire season and dormancy type. Australian Journal of Botany, 58 (4), 248-256.

Scopus Eid


  • 2-s2.0-77954000476

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4415

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 248

End Page


  • 256

Volume


  • 58

Issue


  • 4

Place Of Publication


  • Australia

Abstract


  • Delayed seedling emergence can negatively affect plant recruitment. Recent work has shown that some species

    with innate seasonal requirements for germination can have seedling emergence delayed, depending on the season of fire. The

    impact of this delay, which is in relation to both resprouters and seedlings of species that emerge independent of season,

    remains unknown. I assessed delayed emergence and subsequent impacts on post-fire recruitment success of three

    Leucopogon species, which all display a seasonal emergence pattern related to their physiological dormancy. Intrapopulation

    comparisons showed that both small (1–6 months) and much larger (12–15 months) delays of emergence reduced

    seedling survival and growth, and increased the time taken for plants to reach maturity. Fire season induced delays produced

    very similar results, with higher mortality and slower growth after winter fires compared with post-summer fire cohorts.

    Seasonal emergence patterns, associated with seed dormancy and germination cues, may therefore provide a mechanism that

    determines the variation of recruitment success after fires in different seasons. A better understanding of the relationship

    between fire season and timing of emergence of physiologically dormant species would be timely considering the forecast

    widening of the fire season due to climate change.

Publication Date


  • 2010

Citation


  • Ooi, M. K. J. (2010). Delayed emergence and post-fire recruitment success: effects of seasonal germination, fire season and dormancy type. Australian Journal of Botany, 58 (4), 248-256.

Scopus Eid


  • 2-s2.0-77954000476

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4415

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 248

End Page


  • 256

Volume


  • 58

Issue


  • 4

Place Of Publication


  • Australia