Helichrysum calvertianum  |  

Adverse climate change impacts In the region where Helichrysum calvertianum occurs; the number of days over 35 C is expected to increase by 2030; particularly in summer (Adapt NSW 2018); exacerbating drought impacts on sites with shallow soils.

Upslope of the Penrose SF population; woodland has been partially cleared to provide a fire buffer to the adjoining pine plantation; and this upslope area is subject to ongoing vehicle and rubbish impacts (Bionet Atlas sighting accessed June 2018).

Although the impacts of fire on the species are not known; changes to fire frequency (including an absence of fire) may affect the recruitment of new plants.

In addition; the frequency of severe fire weather events is expected to increase by 2070 (Adapt NSW 2018); increasing the risk of frequent fire in habitats where the species occurs.

NSW Threatened Species Scientific Committee This possible loss of the Mt Gibralter population is likely due to a combination of fire and erosion of skeletal soil habitat on rock outcrops; possibly worsened by rabbit diggings and recreational pressures (S.

Is germination promoted by fire cues o Recruitment and establishment survival rates of seedlings (germination and survival of seedlings post fire); causes of mortality; population modelling (e.g.; impact of seedling loss); growth and development rates. o Response of Helichrysum calvertianum to fire (are plants killed; do they resprout; post fire recruitment from seed germination and seedling survival). o Response of the species (adults and juveniles seedlings) to grazing impacts.

Threats to Helichrysum calvertianum and its habitat include ongoing anthropogenic disturbance; impacts of feral animals; weed invasion and an inappropriate fire regime.

Although the fire response of H. calvertianum is not known; changes to fire frequency (including an absence of fire) may affect plant recruitment.

In addition; the frequency of severe fire weather events is expected to increase by 2070 (Adapt NSW 2018); increasing the risk of frequent fire in habitats where the species occurs.