Germination of Dracophyllum sayeri F.Muell. (Ericaceae), a vulnerable montane cloud forest endemic

Climate change in tropical montane cloud forest (TMCF) is predicted to impact species adapted to consistent, mild temperatures. We used a temperature gradient plate to investigate the effect of temperature on germination and early seedling survival of Dracophyllum sayeri (Ericaceae), a tree species endemic to TMCF in northeast Queensland, Australia. Despite a narrow distribution, results suggest that a wide range of temperatures is conducive to germination of D. sayeri, including up to 8°C higher than current temperatures. At higher temperatures, a day/night temperature amplitude of at least 5°C was required for optimal germination. In addition, germination was greater when seeds were exposed to natural diurnal light compared to constant darkness. Based on temperature, predictions under future climate conditions include a shift in peak germination from summer to winter/early spring. Results also suggest that D. sayeri has multiple strategies for maximizing germination in warm, alternating temperatures and light-filled gaps, and possesses more acclimation potential to persist under a future climate than previously assumed.

Plant species biology

Plant Species Biology

41

1442-1984

N/A

N/A

14