Predicting extinction from geographical range data – Appendix S1
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SUPPORTING INFORMATION
Predicting extinction from fossil trajectories of geographical ranges in benthic marine
molluscs
Melanie Tietje and Wolfgang Kiessling
Journal of Biogeography
Appendix S1 Supporting tables and figures (Tables S1–S2 and Figs S1–S5)
Table S1 Effects of data filtering on sample sizes.
Exclusions
Original dataset
Renaming WoRMS
Mesozoic / Cenozoic
Subset
Single occurrences,
NA/0 palaeo-coordinates,
unnamed genera,
only 0-coordinates
Partition
Threshold
Mass extinction
> 25% zero values
Maximum at start
Suitable for prediction
Bivalvia
2084
2002
Number of genera
Gastropoda
3075
2944
1521
2219
1135
1389
extinct
766
430
357
196
NA
NA
extant
368
312
301
214
206
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Table S2 Effects of different volatility filtering on sample sizes.
Zero-values
(%)
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Excluded genera (%)
Bivalves
Gastropods
0.25
0.18
0.27
0.19
0.31
0.23
0.42
0.30
0.55
0.39
0.58
0.42
0.74
0.60
0.79
0.66
0.82
0.70
0.90
0.81
extinct
719
376
359
145
NA
NA
extant
670
534
517
334
319
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Predicting extinction from geographical range data – Appendix S1
Figure S1 The distribution of stage lengths in the dataset. Stages range from the Induan
(earliest Triassic) to the Pleistocene. Median duration of is 5.34 Myr with a minimum of 1
Myr and a maximum of 26.4 Myr.
Figure S2 Maximum geographical range observed in each geological stage for the bivalve
dataset. Maximum range for all genera was calculated for every stage and plotted against the
mean time of the stages. Dashed line is the linear regression of the data. Results look similar
for gastropods (data not shown).
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Predicting extinction from geographical range data – Appendix S1
Figure S3 Percentages of genera of (a) bivalves and (b) gastropods possibly affected by
mass extinctions. Shown are ratios of genera with a last geographical range larger than or
equal to 50, 75, 90 or 100%, plotted against the mean ages of the corresponding stage.
Ratios were calculated by dividing the integer of affected genera by the number of
occurrences in the respective stage. The peak at 68 Myr represents the Maastrichtian, the
stage of the end-Cretaceous mass extinctions.
(a)
(b)
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Predicting extinction from geographical range data – Appendix S1
Figure S4 Geographical range trajectories of extinct (a) bivalve and (b) gastropod genera
using means instead of medians to calculate the average (cf. Fig. 1).
(a)
(b)
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Predicting extinction from geographical range data – Appendix S1
Figure S5 The effect of mass extinction on average range trajectories for (a) bivalves and
(b) gastropods. The solid black line indicates the average trajectory including all genera, the
dashed line is the average trajectory excluding genera affected by mass extinctions (cf. Fig.
1).
(a)
(b)
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