Effects of fire season on the reproductive success of the post-fire flowerer Doryanthes excelsa

Paroissien, Ruby; Ooi, Mark K. J.

doi:10.1016/j.envexpbot.2021.104634

Cited by 8 publications

(6 citation statements)

References 61 publications

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“…formosa plants to flower was also faster after autumn burns, compared to spring burns, effectively decreasing the secondary juvenile period. These results support other studies of pyrogenic flowering shrubs that show more vigorous flowering after autumn compared to spring burns in Mediterranean‐climate (Bowen & Pate, 2004) and aseasonal rainfall regions (Paroissien & Ooi, 2021). Our study region has an aseasonal rainfall climate, with no annual drought period, which highlights that post‐fire flowering variation in response to the season that fires occur is likely related to resourcing rather than seasonal stresses.…”

Section: Discussionsupporting

confidence: 90%

“…For example, the consistent relationship between season of fire and flowering of L. formosa, a species strongly dependent on fire for significant reproduction, suggests that season of burn should be considered when managing facultative pyrogenic flowerers. We would recommend that autumn burns should be preferred over spring burns in this region when this plant functional group is a conservation focus, a finding supported by studies of other pyrogenic flowering species (e.g., Paroissien & Ooi, 2021). However, further research needs to be conducted to see if the differences found have any long-term impacts or how broadly such impacts are across multiple functional groups (Miller et al, 2019;Nolan et al, 2021).…”

Section: Resprout Growthmentioning

confidence: 93%

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Shifting season of fire and its interaction with fire severity: Impacts on reproductive effort in resprouting plants

Thomsen

Ooi

2022

Ecology and Evolution

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Fire regimes shape plant communities but are shifting with changing climate. More frequent fires of increasing intensity are burning across a broader range of seasons. Despite this, impacts that changes in fire season have on plant populations, or how they interact with other fire regime elements, are still relatively understudied. We asked (a) how does the season of fire affect plant vigor, including vegetative growth and flowering after a fire event, and (b) do different functional resprouting groups respond differently to the effects of season of fire? We sampled a total of 887 plants across 36 sites using a space‐for‐time design to assess resprouting vigor and reproductive output for five plant species. Sites represented either a spring or autumn burn, aged one to three years old. Season of fire had the clearest impacts on flowering in Lambertia formosa with a 152% increase in the number of plants flowering and a 45% increase in number of flowers per plant after autumn compared with spring fires. There were also season × severity interactions for total flowers produced for Leptospermum polygalifolium and L. trinervium with both species producing greater flowering in autumn, but only after lower severity fires. Severity of fire was a more important driver in vegetative growth than fire season. Season of fire impacts have previously been seen as synonymous with the effects of fire severity; however, we found that fire season and severity can have clear and independent, as well as interacting, impacts on post‐fire vegetative growth and reproductive response of resprouting species. Overall, we observed that there were positive effects of autumn fires on reproductive traits, while vegetative growth was positively related to fire severity and pre‐fire plant size.

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Section: Discussionsupporting

confidence: 90%

Section: Resprout Growthmentioning

confidence: 93%

Shifting season of fire and its interaction with fire severity: Impacts on reproductive effort in resprouting plants

Thomsen

Ooi

2022

Ecology and Evolution

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“…Grasslands are frequently comprised of a proportionally large number of post-fire flowering species 34 , which are inherently resprouting species. These same grasslands may be under the influence of short fire intervals (e.g., 1-4 years between fires 26 ), and therefore, reproduction in PFF species in grasslands may be less contingent on the timing of fire and more influenced by variables not captured by this analysis, such as, local differences in environmental conditions that impact postfire reproduction success 43 .…”

Section: Resultsmentioning

confidence: 99%

Success of post-fire plant recovery strategies varies with shifting fire seasonality

Tangney

Paroissien

Breton

et al. 2022

Commun Earth Environ

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Wildfires are increasing in size and severity and fire seasons are lengthening, largely driven by climate and land-use change. Many plant species from fire-prone ecosystems are adapted to specific fire regimes corresponding to historical conditions and shifts beyond these bounds may have severe impacts on vegetation recovery and long-term species persistence. Here, we conduct a meta-analysis of field-based studies across different vegetation types and climate regions to investigate how post-fire plant recruitment, reproduction and survival are affected by fires that occur outside of the historical fire season. We find that fires outside of the historical fire season may lead to decreased post-fire recruitment, particularly in obligate seeding species. Conversely, we find a general increase in post-fire survival in resprouting species. Our results highlight the trade-offs that exist when considering the effects of changes in the seasonal timing of fire, an already present aspect of climate-related fire regime change.

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“…Seasonal variations in physiological traits have been documented to affect plant growth and survival [95]. Moreover, fire-adapted species thriving in post-fire environments have been well studied [96,97]. Understanding the seasonal dynamics of plant physiology could provide further insights into the mechanisms driving observed patterns, contributing to more effective ecosystem management strategies.…”

Section: Future Evaluations On the Effects Of Preventive Treatments I...mentioning

confidence: 99%

Short-Term Effects of Prescribed Burn Seasonality on the Understory in a Pinus nigra Arnold subsp. salzmannii (Dunal) Franco Mediterranean Forest

Fajardo-Cantos

Moya

Lucas‐Borja

et al. 2023

Fire

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Worsening climate change and increasing temperatures generate more sever and extended wildfires, raising concerns about ecosystem services. Prescribed burns (PB) are used to reduce forest fuel loads. Improving knowledge regarding the vegetation response after PB is essential for generating common points for monitoring ecological burning effects and generating a protocol or practice guide. We compared the PB seasonality of low-intensity (spring, summer, and autumn) and unburned areas in a total of 12 plots in Pinus nigra Arnold ssp. salzmannii Mediterranean forest. Our vegetation analysis was short term (one year after each PB). We analyzed vegetation coverage, α-diversity (Pielou, Simpson, and Shannon’s index), life forms, and fire-adapted traits using the Canfield transect method, followed by statistical analyses such as non-metric multidimensional scaling (NMDS) and two-way ANOVA. α-diversity was significantly decreased (>55% of dissimilarity) in the burned plots during each season, with the lowest values after summer PB (69% of dissimilarity) when comparing the burned and unburned plots. There was a significant increase in hemicryptophytes (15−20%) and geophyte coverage (from 6% to 14%, or from 4% to 8% in certain cases) in the burned plots after PB seasonality; however, the phanerophytes were reduced (from 13% to 5%). Resprouters were more dominant after PB (an increase of 15–20%), which indicates that resprouters have a faster recovery and generate a fuel load quickly for highly flammable species such as Bromus after low-intensity burning. This suggests that low-intensity prescribed burning may not be the best methodology for these resprouting species. This study helps to understand how burning in the early season can affect inflammable vegetation and the change in fuel that is available in semi-arid landscapes. This is key to achieving the basis for the development of a standardized system that allows for the efficient management of forest services in order to reduce wildfire risks. One objective of this line of research is to observe the effects of recurrent burning in different seasons on vegetation, as well as plant−soil interaction using the microbial and enzyme soil activity.

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Effects of fire season on the reproductive success of the post-fire flowerer Doryanthes excelsa

Cited by 8 publications

References 61 publications

Shifting season of fire and its interaction with fire severity: Impacts on reproductive effort in resprouting plants

Shifting season of fire and its interaction with fire severity: Impacts on reproductive effort in resprouting plants

Success of post-fire plant recovery strategies varies with shifting fire seasonality

Short-Term Effects of Prescribed Burn Seasonality on the Understory in a Pinus nigra Arnold subsp. salzmannii (Dunal) Franco Mediterranean Forest

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