“…This is despite a growing number of reports of positive responses to a heat pulse in a diverse range of families with PD [e.g., Apiaceae ( Baker et al, 2005c ), Ericaceae ( Moreira et al, 2010 ), Lamiaceae ( Kazancı and Tavşanoǧlu, 2019 ); Myrtaceae ( Auld and Ooi, 2009 ), and Rutaceae ( Mackenzie et al, 2016 )]. Where both cues have been investigated in combination, responses are highly variable and species-specific, ranging from neutral to additive ( Keith, 1997 ; Kenny, 2000 ; Newton et al, 2021 ), unitive (both cues required ( Thomas et al, 2007 ; Mackenzie et al, 2016 ; Collette and Ooi, 2020 ); synergistic ( Gilmour et al, 2000 ; Baker et al, 2005a ); and negative (a heat pulse inhibits the smoke response without loss of viability; Keeley and Fotheringham, 1998 ; Collette and Ooi, 2017 ). Potential interactions between fire cues and environmental cues such as light ( Bell, 1994 ; Gilmour et al, 2000 ; Collette and Ooi, 2017 ) and moisture ( Thomas et al, 2010 ) create additional complexity.…”