Agriculture Reference
In-Depth Information
(a)
(b)
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Fig. 9.8
Distribution of resprouting (squares) and serotiny (crosses) in the phylogeny of (a) the
main woody species in fire-prone ecosystems of California and eastern Spain (Mediterranean
Basin), and (b) the main woody species in the mallee vegetation of southeast Australia. The
phylogenetic signal (niche conservatism) of resprouting is highly significant for both trees
(
P
< 0.01). (Elaborated from Pausas
et al.
2006b; Pausas & Bradstock 2007.)
chaparral failed to resprout after fire, despite this being a nearly ubiquitous trait in
woody dicots (e.g.
Fig. 9.8
). In this community there are roughly 15 genera of
shrubs; all have resprouting taxa and most are obligate resprouters with fire-
independent recruitment. Two of the genera,
Arctostaphylos
and
Ceanothus
, have
postfire seedling recruitment; some taxa in these two genera are also resprouters
but others are non-resprouters and are termed obligate seeders. Subsequent stud-
ies (Le Maitre & Midgley
1992
; Pausas
et al.
1999
; Bell
2001
) have reported
obligate seeding species in woody genera from crown fire regimes in MTC parts
of South Africa, Australia and the Mediterranean Basin (see
Table 3.4
). These
