The northern Fennoscandian tree-line area consists of fairly distinct vegetation zones. The pollen stratigraphies of two boreal sites and two tundra sites were studied and the palynological data analysed numerically. The main aim was to measure palynological richness, using rarefaction analysis, and to assess its value in reflecting patterns of past floristic richness. Rates of palynological change were measured using both chord distance and Euclidean distance as the dissimilarity coefficient. The results show low palynological richness during the Younger Dryas. The values increase rapidly at the transition to the Holocene. During the Holocene the values are in reversed order in relation to present vegetation density, the tundra sites having the highest palynological richness. This suggests that differences in the size of the pollen catchment may have an important role in palynological richness estimates and that no straight comparisons of palynological richness should be made between sites from different vegetation zones. Most pronounced changes in palynological richness take place in the Lake Rautuselka core, where high Pinus pollen influx is correlated with low palynological richness. At the boreal sites, high rates of change are associated with higher palynological richness whereas no similar relationship is observed at the tundra sites.
Aario, L.1960: Vegetation zones of Lapland. In Aario, L. , editor, Atlas of Finland, Helsinki: National Board of Survey and Geographical Society of Finland .
2.
Adams, J.M. and Woodward, F.I.1989: Patterns in tree species richness as a test of the glacial extinction hypothesis . Nature339, 699–701 .
3.
Bennett, K.D.1994: Psimpoll 2.23 and pscomb 1.00 C programs for plotting pollen diagrams and analyzing pollen data–documentation. INQUA, Commission for the study of the Holocene: working group on data-handling methods , Newsletter11, 4–6 .
4.
Bennett, K.D. and Humphry, R.W.1995: Analysis of late-glacial and Holocene rates of vegetational change at two sites in the British Isles . Review of Palaeobotany and Palynology85, 263–287 .
5.
Bennett, K.D. , Boreham, S. , Sharp, M.J. and Switsur, V.R.1992: Holocene history of environment, vegetation and human settlement on Catta Ness, Lunnasting, Shetland . Journal of Ecology80, 241–273 .
6.
Birks, H.J.B.1996: Achievements, developments, and future challenges in quantitative Quaternary palaeoecology. INQUA, Sub-commission on data-handling methods , Newsletter14, 2–8 .
7.
Birks, H.J.B. and Line, J.M.1992: The use of rarefaction analysis for estimating palynological richness from Quaternary pollen-analytical data . The Holocene2, 1–10 .
8.
Chapin III, F.A. and Körner, C.1994: Arctic and alpine biodiversity: patterns, causes and ecosystem consequences . Trends in Ecology and Evolution9, 45–47 .
9.
Chapin III, F.S. , Shaver, G.R. , Giblin, A.E. , Nadelhoffer, M.J. and Laundre, A.1995: Responses of arctic tundra to experimental and observed changes in climate . Ecology76, 694–711 .
10.
Davis, M.B.1994: Ecology and palaeoecology begin to merge . Trends in Ecology and Evolution9, 357–358 .
11.
Forman, R.T.T.1995: Land Mosaics. The ecology and landscapes and regions. Cambridge: Cambridge University Press .
12.
Forman, R.T.T. and Godron, M.1986: Landscape ecology. New York: John Wiley .
13.
Gjærevoll, O.1956: The plant communities of the Scandinavian alpine snow-beds . Det kgl Norske Videnskabers Selskabs Skrifter1, 1–405 .
14.
Gjærevoll, O.1990: Maps of distribution of Norwegian vascular plants. Vol II Alpine plants. Trondheim: Tapir Publishers .
15.
Grimm, E.C.1988: Data analysis and display. In Huntley, B. and Webb, T. III , editors, Vegetation history, Dordrecht: Kluwer Academic Publishers , 42–76.
16.
Grimm, E.C.1990: TILIA and TILIA •GRAPH. PC spreadsheet and graphics software for pollen data . INQUA, Working Group oni Data-Handling Methods, Newsletter4, 5–7 .
17.
Haapasaari, M.1988: The oligotrophic heath vegetation of northern Fennoscandia and its zonation . Acta Botanica Fennica135, 1–219 .
18.
Hamet-Ahti, L.1963: Zonation of the mountain birch forests in northernmost Fennoscandia . Annales Botanici Societas ‘Vanamo’34, 1–127 .
19.
Hämet-Ahti, L. , Ruuhijärvi, R. and Suominen, J.1988: Vegetation and Flora. In Alalammi, P. , editor, Atlas of Finland, Folio 141, Helsinki: National Board of Survey, Geographical Society of Finland .
20.
Heck, K.L. , van Belle, G. and Simberloff, D.1975: Explicit calculation of the rarefaction diversity measurement and the determination of sufficient sample size . Ecology56, 1459–1461 .
21.
Hyvarinen, H.1975: Absolute and relative pollen diagrams from the northernmost Fennoscandia . Fennia142, 1–23 .
22.
Jackson, S.1990: Pollen source area and representation in small lakes of the northeastern United States . Review of Palaeobotany and Palynology63, 53–76 .
23.
Jacobson Jr., G.L.1988: Ancient permanent plots: Sampling in paleovegetational studies. In Huntley, B. and Webb, T. III , editors, Vegetation history, Dordrecht: Kluwer Academic Publishers , 3–16.
24.
Jacobson Jr., G.L. and Bradshaw, R.H.W.1981: The selection of sites for paleovegetational- studies . Quaternary Research16, 80–96 .
25.
Jacobson Jr., G.L. and Grimm, E.C.1986: A numerical analysis of Holocene forest and prairie vegetation in central Minnesota . Ecology67, 958–966 .
26.
Johnsen, S.J. , Clausen, H.B. , Dansgaard, W. , Iversen, P. , Jouzel, J. , Stauffer, B. and Steffesen, J.P.1992: Irregular glacial interstadials recorded in a new Greenland ice core . Nature359, 311–313 .
27.
Lagerås, P.1996: Farming and forest dynamics in an agriculturally marginal area of southern Sweden, 5000 BC to present: a palynological study of Lake Avegol in the Småland and Upland . The Holocene6, 301–314 .
28.
Lindblad, M. and Bradshaw, R.1995: The development and demise of a Medieval forest-meadow system at Linnaeus' birthplace in southern Sweden: implications for conservation and forest history . Vegetation History and Archaeobotany4, 153–160 .
29.
Lotter, A.F. , Ammann, B. and Sturm, M.1992: Rates of change and chronological problems during the late-glacial period . Climate Dynamics6, 233–239 .
30.
van der Maarel, E.1971: Plant species diversity in relation to management. In Duffey, E. and Watt, A.S. , editors, The scientific management of animal and plant communities for conservation, Oxford: Blackwell Scientific Publications , 45–63.
31.
May, R.M.1973: Stability and complexity in model ecosystems. Princeton: Princeton University Press .
32.
Mitchell, J.F.B. , Manabe, S. , Tokioka, T. and Meleshko, V.1990: Equilibrium Climate Change. In Houghton, J.T. , Jenkins, G.J. and Ephraums, J.J. , editors, Climate change. The IPCC scientific assessment, Cambridge: Cambridge University Press , 131–172.
33.
Moore, P.D. , Webb, J.A. and Collinson, M.E.1991: Pollen analysis. Oxford: Blackwell Scientific Publications .
34.
Noss, R.F.1983: A regional landscape approach to maintain diversity . BioScience33, 700–706 .
35.
Odgaard, B.1994: The Holocene vegetation history of northern West Jutland, Denmark . Opera Botanica123, 1–171 .
36.
Oksanen, L. and Virtanen, R.1995: Topographic, altitudinal and regional patterns in continental and suboceanic heath vegetation of northern Fennoscandia . Acta Botanica Fennica153, 1–80 .
37.
Overpeck, J.T. , Webb, T. III and Prentice, I.C.1985: Quantitative interpretation of fossil pollen spectra: Dissimilarity coefficients and the methods of modern analogues . Quaternary Research23, 87–108 .
38.
Peet, R.K.1978: Forest vegetation of the Colorado front range: patterns of species diversity . Vegetatio37, 65–78 .
39.
Peet, R.K. , Glenn-Lewin, D.C. and Walker Wolf, J.1983: Prediction of man's impact on plant species diversity. In Holzner, M. , Werger, J.A. and Ikusima, I. , editors, Man's impact on vegetation, The Hague: Dr W. Junk Publishers , 41–53.
40.
Peterken, G.F. and Game, M.1984: Historical factors affecting the number and distribution of vascular plant species in the woodlands of central Lincolnshire . Journal of Ecology72, 155–182 .
41.
Prentice, H.C.1981: A late Weichselian and early Flandrian pollen diagram from Østervatnet, Varanger Peninsula, NE Norway . Boreas10, 53–70 .
42.
Prentice, H.C.1982: Late Weichselian and early Flandrian vegetational history of Varanger Peninsula, northeastern Norway . Boreas11, 187–208 .
43.
Prentice, I.C.1980: Multidimensional scaling as a research tool in Quaternary palynology: a review of theory and methods . Review of Palaeobotany and Palynology31, 71–104 .
44.
Prentice, I.C.1988: Records of vegetation in time and space: the principles of pollen analysis. In Huntley, B. and Webb, T. III , editors, Vegetation history, Dordrecht: Kluwer Academic Publishers , 17–42.
45.
Ricklefs, R.E.1987: Community diversity: relative roles of local and regional processes . Science235, 167–171 .
46.
Ritchie, J.C.1996: Tansley Review No. 83. Current trends in studies of long-term plant community dynamics . New Phytologist130, 469–494 .
47.
Rudberg, S.1987: Geology and geomorphology of Norden. In Varjo, U. and Tietze, W. , editors, Norden: man and environment, Berlin: Gebrüder Borntraeger , 54–119.
48.
Schoonmaker, P.K. and Foster, D.R.1991: Some implications of paleoecology for contemporary ecology . The Botanical Review57, 204–245 .
49.
Schultze, E.-D. and Mooney, H.A.1993: Biodiversity and ecosystem function. Berlin: Springer Verlag .
50.
Seppä,H.1996: Post-glacial dynamics of vegetation and tree-lines in the far north of Fennoscandia . Fennia174, 1–96 .
51.
Seppä,H.1997: Long-term development of urban vegetation: a pollen diagram from Töölönlahti Bay, Helsinki, Finland. Vegetation History and Archaeobotany, in press.
52.
Simberloff, D.1979: Rarefaction as a distribution-free method of expressing and estimating diversity In Grassle, J.F. , Patil, G.P. and Taillie, C. , editors, Ecological diversity in theory and practice, Maryland: Fairland , 159–176.
53.
Simonen, A.1964: Kallioperä. In Rankama, K. , editor, Suomen geologia. Helsinki: Kirjayhtyma , 49–124.
54.
Sollid, J.L. , Andersen, S. , Hamre, N. , Kjeldsen, O. , Salvigsen, O. , Sturöd, S. , Tweita, T. and Wilhemsen, A.1973: Deglaciation of Finnmark, North Norway . Norsk Geografisk Tidskrift27, 233–325 .
55.
Stuiver, M. and Reimer, P.J.1993: Extended 14C data base and revised CALIB 3.0 14C calibration program . Radiocarbon35, 215–230 .
56.
Sugita, S.1994: Pollen representation of vegetation in Quaternary sediments: theory and method in patchy vegetation . Journal of Ecology82, 881–897 .
57.
Tilman, D.1996a: The benefits of natural disasters . Science273, 1518-1518 .
58.
Tilman, D.1996b: Biodiversity: population versus ecosystem stability . Ecology77, 350–363 .
59.
Tilman, D. and Downing, J.A.1994: Biodiversity and stability in grassland . Nature367, 363–365 .
60.
Törnqvist, T.E. and Bierkens, M.C.1994: How smooth should curves be for calibrating radiocarbon ages . Radiocarbon36, 11–26 .
61.
Vetaas, O.R.1994: Primary succession of plant assemblages on a glacier foreland–Bödalsbreens, southern Norway . Journal of Biogeography21, 297–308 .
62.
Vitousek, P.M.1994: Beyond global warming: ecology and global change . Ecology75, 1861–1876 .
63.
Walker, D.1989: Diversity and stability. In Cherrett, J.M. , editor, Ecological concepts–the contribution of ecology to an understanding of the natural world. Oxford: Blackwell Scientific Publications , 115–145.
64.
Webb, N.R. and Vermaat, A.H.1990: Changes in vegetational diversity on remnant heathland fragments . Biological Conservation53, 253–264 .
65.
White, P.S.1979: Pattern, process, and natural disturbance in vegetation . Botanical Review45, 229–299 .
66.
Whittaker, R.1965: Dominance and diversity in plant communities . Science147, 250–260 .
67.
Zonneveld, I.S. and Forman, R.T.T. , editors, 1990: Changing landscapes: an ecological perspective. New York: Springer Verlag .
