Fig 7 - uploaded by Alison Hewitt
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Number of emerged Micromyrtus minutiflora seedlings per soil block at 10 weeks following treatment with fire cues of heat, smoke or their combination. Control soil blocks were not exposed to these treatments. Data are means (square-root count). Error bars are standard error. Means labelled with different letters are significantly different at α < 0.05.
Source publication
Context Little is known of the ecology of Micromyrtus minutiflora, a threatened plant species endemic to the Cumberland subregion, New South Wales, Australia. Aims To fill ecological knowledge gaps of M. minutiflora, including habitat preferences, population size and structure, survivorship; and responses to fire and disturbance to inform appropria...
Contexts in source publication
Context 1
... emergence of M. minutiflora from soil blocks was very strongly increased by the fire-related cues of heat and smoke (main effects significant; heat, F 1,56 = 11.1, P = 0.002; smoke, F 1,56 = 12.05, P = 0.001) (Fig. 7). Smoke and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements ...
Context 2
... by the fire-related cues of heat and smoke (main effects significant; heat, F 1,56 = 11.1, P = 0.002; smoke, F 1,56 = 12.05, P = 0.001) (Fig. 7). Smoke and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements for emergence (Fig. 7). Disturbance, by itself or combined with other treatments, had no significant effect on the emergence of seedlings. Fig. 6. Micromyrtus minutiflora root system (specimen from Agnes Bank ...
Context 3
... and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements for emergence (Fig. 7). Disturbance, by itself or combined with other treatments, had no significant effect on the emergence of seedlings. Fig. 6. Micromyrtus minutiflora root system (specimen from Agnes Bank Nature Reserve). ...
Context 4
... emergence of M. minutiflora from soil blocks was very strongly increased by the fire-related cues of heat and smoke (main effects significant; heat, F 1,56 = 11.1, P = 0.002; smoke, F 1,56 = 12.05, P = 0.001) (Fig. 7). Smoke and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements ...
Context 5
... by the fire-related cues of heat and smoke (main effects significant; heat, F 1,56 = 11.1, P = 0.002; smoke, F 1,56 = 12.05, P = 0.001) (Fig. 7). Smoke and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements for emergence (Fig. 7). Disturbance, by itself or combined with other treatments, had no significant effect on the emergence of seedlings. ...
Context 6
... and heat interacted significantly (F 1,56 = 4.24; P = 0.044). However, emergence after the combination of smoke and heat was less than that expected if they combined to produce an additive effect (Fig. 7). Some limited emergence also occurred in the control treatment, indicating that heat and smoke are not essential requirements for emergence (Fig. 7). Disturbance, by itself or combined with other treatments, had no significant effect on the emergence of seedlings. ...
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Citations
... The ruderal/fire sensitive obligate-seeder species include local endemics Dillwynia tenuifolia, Pultenaea parviflora, Micromyrtus minutiflora, Persoonia nutans and Prostanthera scutellarioides, mostly species with limited seed distance-dispersal (consistent with long term OCBIL site occupation). Some have disturbancerelated ecologies involving rainfall events for successful recruitment such as Micromyrtus minutiflora, and are able to establish from soil seedbanks without fire (though heat and smoke significantly increase germination) but need open conditions to do so (Bangel et al. 2023). Survival in LGM conditions, especially for obligate-seeder Fabaceae species, could have involved very long seed dormancy periods, alternating with shorter periods as adults, effectively a desert-ephemeral ecology with reduced need for regular rainfall. ...
Despite the importance of the Last Glacial Maximum (LGM) in the formation of modern Australian vegetation, no comprehensive account exists of the likely vegetation of this period in the Sydney Basin. Likely past LGM vegetation events and patterns for this region are proposed, based on geomorphological, palynological and archaeological studies, combined with current geographical distributions of endemic, restricted and common plant species, inferences from basic ecological characteristics, observed vegetation community interactions, and morphological or genomic variation. Based on ecological attributes (stress-tolerators, competitors, ruderals), and geographic distributions, individual species are associated with likely past survival during the drier and colder LGM climate (28 000-18 000 years BP), across the different landscapes within the region. These include the old, climatically buffered, infertile (OCBIL) Sydney sandstone plateau systems; the old but more fertile shale (OCFEL) areas (Illawarra, western Sydney, Central Tablelands); the younger fertile alluvial lowlands (YODFELs); and the now-inundated LGM continental shelf/coastal plain. Potential LGM vegetation scenarios include Blue Mountains moisture-related stress-tolerant heath, mallee, seepage and cliffline vegetation on an LGM subalpine zone (>800 m elev.) with snowmelt and effectively better moisture; dry grassland and mallee shrubland on the Central Tablelands and western Sydney shale areas; and eastward movement of western clay soil species through Hunter Valley/Southern Highland connections and sclerophyll shrubs across mid-elevation dry sandstone. The importance of the coastal plain/continental shelf, including coastal wallum vegetation, is suggested as the origin of many species' distribution disjunctions. By interweaving circumstantial evidence and speculation, hypotheses and narratives can be developed to provide a spur to plant ecological and biogeographic research and advance research in the field.
