Seed Viability and Fire-Related Temperature Treatments in Serotinous California Native Hesperocyparis Species

Fire Ecology

Table 4 Fire regime requirements for each of the five species studied, by location, north to south. Fire regimes are taken from published literature, heat tolerance is based on original findings of seed viability.

Species	Climate¹	Vegetation	Historic fire regime	Current fire regime	Heat tolerance	Source
H. bakeri	30 °C, −4 °C, 973 mm	mixed conifer	frequent, mixed severity	infrequent, high severity	low	Wolf (1948), Keeler-Wolf (2004a)
H. macnabiana	33 °C, 2 °C, 988 mm	inner coast chaparral	mixed, frequent high severity	infrequent, high severity	medium	Mallek (2009)
H. sargentii	33 °C, 2 °C, 988 mm	inner coast chaparral	infrequent, high severity	infrequent, high severity	medium	Ne’eman et al. (1999)
H. nevadensis	36 °C, 0 °C, 336 mm	foothill woodland	unknown frequency, high severity	unknown frequency, high severity	high	van Wagtendonk and Fites-Kaufman (2006)
H. forbesii	36 °C, 6 °C, 306 mm	southern California chaparral	infrequent, high severity	frequent, high severity	high	de Gouvenain and Ansary (2006)

¹ The first value represents the average summer high temperature, the second value the average winter low, and the third value the average annual precipitation. All climate data was obtained from the nearest US Department of Commerce National Oceanic and Atmospheric Administration weather station for each population sampling site.