The Botany of Iceland - 01.12.1930, Page 38
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H. XI0LHOLM HANSEN
Tabel 5. Distribution of the Species Groups in Iceland.
n A E A3 A2 A 1 E4 E3 E2 E1
11—1200 m 28 78.6 21.4 57.1 10.7 10.7 17.9 3.6 » »
10—1100 - 20 85.0 15.0 65 0 10.0 10.0 15.0 » » »
9—1000 - 28 82.1 17.9 57.1 14.3 10.7 14.3 3.6 » »
8— 900 - 20 88.5 11.5 05.4 11.5 11.5 11.5 > » »
7— 800 - 05 80.0 20.0 44.6 24.6 10.8 18.5 1.5 » »
6 700 - 91 73.6 26.4 35.2 25.3 13.2 20.9 4.4 1.1 »
5- 000 - 117 69.2 30.8 29.1 28.2 12.0 19.7 6.8 3.4 0.9
4— 500 - 101 59.6 40.4 23.0 24.8 11.2 18.6 13.0 7.5 1.2
3— 400 - 204 49.5 50.5 19.6 20.1 9.8 18.6 15.2 13.7 2.9
Tvidægra 120 57.9 42.1 21.4 25.4 11.1 21.4 14.3 5.6 0.8
Mývatn 100 50.0 49.4 18.7 20.4 11.4 19.3 16.3 11.4 2.4
East lceland 272 45.2 54.8 16.5 17.3 11.4 16.9 17.3 13.2 7.4
North Iceland 331 44.4 55.0 16.3 15.1 13.0 17.2 15.1 13.0 10.3
Vestflrðir 277 43.7 56.3 15.5 15.9 12.3 18.1 16.6 14.4 7.2
South-West Iceland 314 40.4 59.0 13.7 14.3 12.4 10.9 16.2 14.0 12.4
South Iceland 309 39.2 00.8 13.9 13.9 11.3 17.2 15.5 13.9 14.2
The highland tracts8—1200 m 40 80.0 20.0 57.5 12.5 10.0 15.0 5.0 » »
— — — 3— 800 - 224 51.8 48.2 20.1 20.5 11.2 17.4 15.2 12.9 2.7
The whole of Iceland 375 40.3 59.7 14.6 13.6 12.0 15.2 14.1 | 14.1 16.3
The highland tracts8—1200 m 102 83.3 16.7 60.8 11.8 10.8 14.7 2.0 » »
— — — 3— 800 - 038 62.2 37.8 27.1 24.0 11.1 19.1 10.2 7.1 1.4
The whole of Iceland 1 1503 42.5 57.5 15.2 15.2 12.1 17.2 16.1 13.7 10.4
species, partly of the number of points 1) for the whole of Iceland,
which means, practically, for the lowlands of lceland, 2) for the
highland tracts bctween the 300 and 800 m curves, and, finally,
3) for the highland tracts between the 800 and 1200 m curves. It
appears from the table with all desirable plainness that the A group
is best adapted to Icelandic conditions, considerably better than the
E group. This is evident both from the values computed from the
species figures and those computed frorn the points, but it is espe-
cially evident on comparison between tlie percentages within the
same altitude group.
If, next, we consider the subgroups, the table shows a gradual
adaptation to arctic conditions. E 2 and especially E 1 show the
poorest adaptation, not even the lowlands seem to oft'er favourable
conditions for the species of these two groups. E 3 thrives well here,