Table 1: Dominating species in at least one of the 461 samples analysed in this paper, ranked after mean relative abundance in the assemblages dominated by these species. Note that only the six most abundant species can be considered dominant on a biogeographic scale, and 6 species may dominate assemblages only in a few samples on a local scale. PD intergrades are forms intermediate between N. pachyderma and N. dutertrei.

Species
names

N. pachyderma
PD intergrade
G. inflata
G. bulloides
G. ruber
G. glutinata
G. menardii
T. quinqueloba
G. sacculifer
P. obliquiloculata
N. dutertrei
G. falconensis

Mean rel.
abundance

63.2
36.0
35.3
31.7
26.3
25.9
24.3
24.3
20.3
19.8
19.6
15.8

Standard
deviation

28.9
12.2
15.4
13.2
8.1
6.7
7.8
2.9
3.7
-
4.7
0.4

No. of
cases

104
3
47
49
191
21
25
2
6
1
4
6

Biogeographic
preferences

subpolar-polar
-
transitional
central cool productive
subtropical-marginal tropical
marginal cool productive
central tropical
-
-
-
-


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