Claim · model-written summary
Common and rare Persoonia species had low seed mortality without fire.
Not reportedTaxonMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Verbatim
e0“I found high levels of seed dormancy and low levels of seed mortality in the absence of fire in both common and rare species.”
Title
David J. McKenna Research Online (University of Wollongong) 2007
Other claims from this paper (19)
- Observation Common and rare Persoonia species had high seed dormancy without fire.
- Observation Persoonia germination occurred only at sites burned in late 2001.
- Intervention effect Persoonia germination was significantly higher after medium intensity fire than after low intensity or partial burns.
- Observation None of the postfire Persoonia seedlings survived to October 2002.
- Association Fire effects became more uniform at larger site scales as intensity increased.
- Observation The first fire produced 473 P. mollis subsp. nectens seedlings at 3.5 years.
- Observation The second fire produced 287 P. mollis subsp. nectens seedlings at 3.5 years.
- Intervention effect Significantly fewer seedlings followed the second fire.
- Observation Seedlings clustered significantly at small scales around dead adults.
- Intervention effect The second fire tightened clustering around dead adults.
- Intervention effect The second fire yielded fewer seedlings dispersed away from adults.
- Observation Population growth rates of all five Persoonia species were not significantly different from 1 in the normal year.
- Association Population growth rates trended downward in all species and sites in the drought year.
- Association The drought-year population growth reduction was significant in P. glaucescens.
- Association The drought-year population growth reduction was significant in P. bargoensis.
- Association Stasis had the strongest influence on population growth in the normal year.
- Association Seed-bank survival became most influential for rare P. glaucescens and P. bargoensis during drought.
- Association Rare Persoonia species buffered drought less effectively through survival than common species.
- Observation Modeled regular fire return intervals shorter than 8–10 years led to extinction of all Persoonia populations.