Fig 1.
Example of urban tree bases with spontaneous flora.
Fig 2.
Illustration of the dynamics of the BOA process with patch extinction probability pext ∈ [0, 1] and maximal dormancy duration , and its variant with a noise parameter ϵ ∈ [0, 1].
The parts in grey are those specific to the noisy BOA process variant.
Fig 3.
Evolution of the critical patch extinction probability pc(H) for the BOA process, as a function of the maximal dormancy duration H.
The red dotted line indicates the critical value pc(0) above which survival at the metapopulation scale in the BOA process is not possible in the absence of a seed bank. The thin black line indicates the limiting value of pc(H) when H → +∞. Figure adapted from [18], with improved estimates for pc(H).
Table 1.
Species traits considered as part of the study, and statistical tests used to assess their effect on the local and global extinction risks (averaged over all streets for each species).
The database used to identify these traits were the LEDA database [23] and BaseFlor [25].
Fig 4.
Global (MaxGER) and local (LER) extinction risks of each species listed in Table B in S1 Text, across portions of streets listed in Table B in S1 Text.
Fig 5.
Illustration of the relation between the global extinction risk (as quantified by the MaxGER metric, and averaged over all streets for each species) and three traits for which a significant correlation was identified: (a) the maximal height (p-value = 0.004763), (b) the beginning of the flowering period (p-value = 0.00915) and (c) the flowering duration (p-value = 0.002677).
Table 2.
Species identified as having a low or high global extinction risk, as assessed by the MaxGER metric.
We interpreted an average MaxGER ≤ 0.125 across streets as having a low extinction risk. Species listed as having a high global extinction risk are those identified as part of the regression analysis.