Fróðskaparrit - 01.01.1998, Page 13

Fróðskaparrit - 01.01.1998, Page 13
EIN OYGGJALÍVLANDAFRØÐILIG GREINING AV FLORUNI í FØROYUM 19 included in our study. According to Hansen (1972), the total number of species (minus subspecies) on the Faroes is 329, 262 of which are natural, 22 are imported and na- turalised and 45 are not naturalised and non-established species. Results and discussion The motive for our choice of material is that it provides a time specific picture of pre- cisely what species made up the Faroese flora in 1960-61. The study was very com- prehensive (Hansen, 1964; 1966; 1972). A total of 135 stations were examined, evenly distributed across the Faroe Islands, and some 20,000 single observations were made. Every station comprised a few km2. The Faroese flora has doubtlessly under- gone changes from 1960 up till the present. One of the most common species today in the Tórshavn region seems to be american willowherb (Epilobium ciliatum), which is not even mentioned in Hansen (1966). Ne- vertheless, we find that many alterations in the distribution maps and even new species will not dramatically change the conclu- sions of the present paper because it builds on as many as 294 species. fhe number ofplant species on the individual islands Based on Hansen’s distribution maps (1966), we have counted the number of species localised on each of the 18 major is- iands. See Table 1. In the survey period, 112 species of vas- cular plants were found on the island of Skúvoy, and the island covers 10 km2. Mykines is of similar size (10.3 km2), and Suðuroy Number of species 238 Area, km2 166.0 Stóra Dímun 65 2,7 Skúvoy 112 10.0 Sandoy 222 112.1 Mykines 107 10.3 Vágar 211 177.6 Hestur 118 6.1 Koltur 108 2.5 Nólsoy 145 10.3 Streymoy 221 373.5 Eysturoy 207 286.4 Kalsoy 139 30.9 Kunoy 151 35.5 Borðoy 163 94.9 Viðoy 136 41.0 Svínoy 128 27.4 Fugloy 126 11.2 Lítla Dímun 12 0.8 Table 1. Number of species and areas ofthe 18 largest Faroe Islands. Talva 1. Talið á sløgum og víddin á 18 oyggjum í Føroyum. even though the two islands are quite unlike each other, the number of species on Mykines is almost the same as that of Skúv- oy, i.e. 107 species. Sandoy is about ten times bigger (112.1 km2), and slightly more than twice the amount of species were lo- calised here, i.e. a total of 222. This seems to indicate that twice as many species can be found on areas ten times as big. The correlation may be formulated more precisely which is the subject of the following chapter. The species-area equation S = cAz In the early days of plant ecology, attempts were made to fínd the precise form of cor- responding materials. Arrhenius (1921) claimed that the correlation could be de- scribed by the exponential function S =
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Page 89
Page 90
Page 91
Page 92
Page 93
Page 94
Page 95
Page 96
Page 97
Page 98
Page 99
Page 100
Page 101
Page 102
Page 103
Page 104
Page 105
Page 106
Page 107
Page 108
Page 109
Page 110
Page 111
Page 112
Page 113
Page 114
Page 115
Page 116
Page 117
Page 118
Page 119
Page 120
Page 121
Page 122
Page 123
Page 124
Page 125
Page 126
Page 127
Page 128
Page 129
Page 130
Page 131
Page 132
Page 133
Page 134
Page 135
Page 136
Page 137
Page 138
Page 139
Page 140
Page 141
Page 142
Page 143
Page 144
Page 145
Page 146
Page 147
Page 148
Page 149
Page 150
Page 151
Page 152
Page 153
Page 154
Page 155
Page 156
Page 157
Page 158
Page 159
Page 160
Page 161
Page 162
Page 163
Page 164
Page 165
Page 166
Page 167
Page 168
Page 169
Page 170
Page 171
Page 172
Page 173
Page 174
Page 175
Page 176
Page 177
Page 178
Page 179
Page 180
Page 181
Page 182
Page 183
Page 184
Page 185
Page 186
Page 187
Page 188
Page 189
Page 190
Page 191
Page 192
Page 193
Page 194
Page 195
Page 196
Page 197
Page 198
Page 199
Page 200
Page 201
Page 202
Page 203
Page 204
Page 205
Page 206
Page 207
Page 208
Page 209
Page 210
Page 211
Page 212
Page 213
Page 214
Page 215
Page 216
Page 217
Page 218
Page 219
Page 220
Page 221
Page 222
Page 223
Page 224
Page 225
Page 226
Page 227
Page 228
Page 229
Page 230
Page 231
Page 232
Page 233
Page 234
Page 235
Page 236
Page 237
Page 238
Page 239
Page 240
Page 241
Page 242
Page 243
Page 244
Page 245
Page 246
Page 247
Page 248
Page 249
Page 250
Page 251
Page 252
Page 253
Page 254
Page 255
Page 256
Page 257
Page 258
Page 259
Page 260
Page 261
Page 262
Page 263
Page 264
Page 265
Page 266
Page 267
Page 268
Page 269
Page 270
Page 271
Page 272
Page 273
Page 274
Page 275
Page 276
Page 277
Page 278
Page 279
Page 280
Page 281
Page 282
Page 283
Page 284
Page 285
Page 286
Page 287
Page 288
Page 289
Page 290
Page 291
Page 292
Page 293
Page 294
Page 295
Page 296
Page 297
Page 298
Page 299
Page 300
Page 301
Page 302
Page 303
Page 304
Page 305
Page 306
Page 307
Page 308
Page 309
Page 310
Page 311
Page 312
Page 313
Page 314
Page 315
Page 316
Page 317
Page 318
Page 319
Page 320
Page 321
Page 322
Page 323
Page 324
Page 325
Page 326
Page 327
Page 328
Page 329
Page 330
Page 331
Page 332
Page 333
Page 334
Page 335
Page 336

x

Fróðskaparrit

Direct Links

If you want to link to this newspaper/magazine, please use these links:

Link to this newspaper/magazine: Fróðskaparrit
https://timarit.is/publication/15

Link to this issue:

Link to this page:

Link to this article:

Please do not link directly to images or PDFs on Timarit.is as such URLs may change without warning. Please use the URLs provided above for linking to the website.