Biodiversity & Conservation

, Volume 7, Issue 2, pp 159–177 | Cite as

Modelling floristic species richness on a regional scale: a case study in Switzerland

  • THOMAS Wohlgemuth


In this paper a multivariate linear regression model is proposed for predicting and mapping regional species richness in areas below the timberline according to environmental variables. The data used in setting up the model were derived from a floristic inventory. Using a stepwise regression technique, five environmental variables were found to explain 48.9% of the variability in the total number of plant species: namely temperature range, proximity to a big river or lake, threshold of minimum annual precipitation, amount of calcareous rock outcrops and number of soil types. A considerable part of the unexplained variability is thought to have been influenced by variations in the quality of the botanical inventory. These results show the importance of systematic floristic sampling in addition to conventional inventories when using floristic data as a basis in nature conservation. Nevertheless it is still possible to interpret the resulting diversity patterns ecologically. Regional species richness in Switzerland appears to be a function of: (i) environmental heterogeneity; (ii) threshold values of minimum precipitation; and (iii) presence of calcareous rock outcrops. According to similar studies, environmental heterogeneity was the strongest determinant of total species richness. In contrast to some studies, high productivity decreased the number of species. Furthermore, the implications of this work for climate change scenarios are discussed.

environmental heterogeneity floristics regional scale regression model species richness precipitation threshold 


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  1. Aeschimann, D. and Burdet, H.M. (1994) Flore de la Suisse et des territoires limitrophes. Neuchaâtel, 603 pp.Google Scholar
  2. Birks, H.J.B. (1996) Statistical approaches to interpreting diversity patterns in the Norwegian mountain flora. Ecography 19, 332-40.Google Scholar
  3. Bowers, J.E. and McLaughlin, S.P. (1982) Plant species diversity in Arizona. MADROÑO 29, 227-33.Google Scholar
  4. Braun-Blanquet, J. (1964) Pflanzensoziologie. Grundzüge der Vegetationskunde. 3. Aufl. Wien: Springer, 865 pp.Google Scholar
  5. Brzeziecki, B., Kieuast, F. and Wildi, O. (1993) A simulated map of the potential natural forest vegetation of Switzerland. J. Veg. Sci. 4, 499-508.Google Scholar
  6. Buckley, R. C. (1985) Distinguishing the effect of area and habitat type on island plant species richness by separating floristic elements and substrate types and controlling for island isolation. J. Biogeogr. 12, 527-35.Google Scholar
  7. Connor, E.F. and Simberloff, D. (1978) Species number and compositional similarity of the Gal-ápagos flora and avifauna. Ecol. Monogr. 48, 219-48.Google Scholar
  8. Connor, E.F. and McCoy, E.D. (1979) The statistics and biology of the species-area relationship. Am. Nat. 113, 791-833.Google Scholar
  9. Currie, D.J. and Paquin, V. (1987) Large-scale biogeographical patterns of species richness of trees. Nature 329, 326-7.Google Scholar
  10. De Quervain, F., Hofmänner, F., Jenny, V., Köppel, V. and Frey, D. (1963-1967) Geotechnische Karte der Schweiz 1: 200 000. 4 maps. Bern: Kümmerly & Frey.Google Scholar
  11. Dzwonko, Z. and Kornas, J. (1994) Patterns of species richness and distribution of pteridophytes in Rwanda (Central Africa): a numerical approach. J. Biogeogr. 21, 491-501.Google Scholar
  12. Gigon, A. (1971) Vergleich alpiner Rasen auf Silikat-und auf Karbonatboden. Veröff. Geobot. Inst. Eidg. Techn. Hochsch., Stiftung Rübel, Zürich 48, 159 pp.Google Scholar
  13. Gregory, S.V., Swanson, F.J., McKee, W.A. and Cummins, K.W. (1991) An ecosystem perspective of riparian zones. BioScience 41, 540-51.Google Scholar
  14. Häberli, R. (1980) Bodeneignungskarte der Schweiz. Eidg. Justiz-und Polizeidepartement-Bunde-samt für Raumplanung. 145 pp. 4 maps.Google Scholar
  15. Haeupler, H. and Schönfelder, P. (1989) Atlas der Farn-und Blütenpflanzen der Bundesrepublik Deutschland. 2. Aufl. Stuttgart.Google Scholar
  16. Hamilton, T.H., Rubinoff, I., Barth, R.H., Jr, and Bush, G.L. (1963) Species abundance: natural regulation of insular variation. Science 142, 1575-7.Google Scholar
  17. Hegg, O., Béguin, C. and Zoller, H. (1993) Atlas schutzwürdiger Vegetationstypen der Schweiz. Bern: Bundesamt für Umwelt, Wald und Landschaft, 160 pp.Google Scholar
  18. Heikkinen, R.K. (1996) Predicting patterns of vascular plant species richness with composite vari-ables: a meso-scale study in Finnish Lapland. Vegetatio 126, 151-65.Google Scholar
  19. Hengeveld, R. (1990) Dynamic biogeography. Cambridge: Cambridge University Press, 249 pp.Google Scholar
  20. Hess, H., Landolt, E. and Hirzel, R. (1976-1980) Flora der Schweiz und angrenzender Gebiete (2. Aufl). Basel: Birkhäuser.Google Scholar
  21. Hnatiuk, R.J. and Maslin, B.R. (1988) Phytogeography of Acacia in Australia in relation to climate and species-richness. Austr. J. Bot. 36, 361-88.Google Scholar
  22. Huber, W. (1992) Zur Ausbreitung von Blütenpflanzen an Sekundärstandorten der Nordschweiz. Botaniea Helvetica. 102, 93-108.Google Scholar
  23. Hulme, M. (1996) Global warming. Prog. Phyx. Geogr. 20, 216-23.Google Scholar
  24. Johnson, M.P., Mason, L.G. and Raven, P.H. (1968) Ecological parameters and plant species diversity. Am. Nat. 102, 297-306.Google Scholar
  25. Landolt, E. (1977) Ökologische Zeigerwerte zur Schweizer Flora. Veröff. Geobot. Inst. Eidg. Techn. Hochsch., Stiftung Rübel, Zürich 64, 208 pp.Google Scholar
  26. Lang, G. (1994) Quartäre Vegetationsgeschichte Europas. Jena: Fischer, 462 pp.Google Scholar
  27. Leathwick, J.R. (1995) Climatic relationship of some New Zealand forest tree species. J. Veg. Sci. 6, 237-48.Google Scholar
  28. Linder, H.P. (1991) Environmental correlates of patterns of species richness in the south-western Cape Province of South Africa. J. Biogeogr. 18, 509-18.Google Scholar
  29. Malyshev, L.I. (1991) Some quantitative approaches to problems of comparative floristics. In Quantitative approaches in phytogeography (P.L. Nimis and T.J. Crovello, eds) pp. 15-33. Dordrecht: Kluwer Academic Publishers.Google Scholar
  30. McCune, B., Dey, J.P., Peck, J.E., Cassell, D., Heiman, K., Will-Wolf, S. and Neitlich, P. N. (1997) Repeatability of community data: species richness versus gradient scores in large-scale lichen studies. The Bryologist 100, 40-6.Google Scholar
  31. McGlone, M.S. (1996) When history matters: scale, time, climate and tree diversity. Global Ecol. Biogeogr. Lett. 5, 309-14.Google Scholar
  32. McLaughlin, S.P. (1992) Are floristic areas hierarchically arranged? J. Biogeogr. 19, 21-32.Google Scholar
  33. Mourelle, C. and Ezcurra, E. (1996) Species richness of Argentine cacti: A test of biogeographic hypotheses. J. Veg. Sci. 7, 667-80.Google Scholar
  34. Myklestad, A. and Birks, H.J.B. (1993) A numerical analysis of the distribution patterns of Salix L. species in Europe. J. Biogeogr. 20, 1-32.Google Scholar
  35. Nilsson, I.N. and Nilsson, S.G. (1985) Experimental estimates of census efficiency and pseudoturnover on islands: error trend and between-observer variation when recording vascular plants. J. Ecol. 73, 65-70.Google Scholar
  36. Palmer, M.W. (1994) Variation in species richness: Towards a unification of hypotheses. Folia Geobot. Phytotax. 29, 511-30.Google Scholar
  37. Palmer, M.W. (1995) Standards for the writing of floras. BioScience 45, 339-45.Google Scholar
  38. Perring, F.H. and Walters, S.M. (1962) Atlas of the British Flora. London: Nelson, 425 pp.Google Scholar
  39. Prendergast, J.R., Wood, S.N., Lawton, J.H. and Eversham, B.C. (1993) Correcting for variation in recording effort in analyses of diversity hotspots. Biodivers. Lett. 1, 39-53.Google Scholar
  40. Rich, T.C.G. and Woodruff, E.R. (1992) Recording bias in botanical surveys. Watsonia 19, 73-95.Google Scholar
  41. Richerson, P.J. and Lum, K.-L. (1980) Patterns of plant species diversity in California: Relation to weather and topography. Am. Nat. 116, 504-36.Google Scholar
  42. Rosenzweig, M.L. (1995) Species diversity in space and time. Cambridge: Cambridge University Press, 436 pp.Google Scholar
  43. Schreiber, K.F., Kuhn, N., Hug, C., Häberli, R. and Schreiber, C. (1977) Wärmegliederung der Schweiz. Bern: Eidg. Justiz-und Polizeidepartement, 69 pp. (4 maps 1: 200 000;1 map 1: 500 000.)Google Scholar
  44. Shmida, A. and Wilson, M.V. (1985) Biological determinants of species diversity. J. Biogeogr. 12, 1-20.Google Scholar
  45. Thienemann, A. (1956) Leben und Umwelt. Vom Gesamthaushalt der Natur. Hamburg: Rowohlt 153 pp.Google Scholar
  46. Turc, L. (1954) Le bilan d'eau dans les sols. Relations entre la précipitation, l'évaporation et l'écoulement. Annals. Agric. 5, 491-591.Google Scholar
  47. Urmi, E., Schnyder, N. and Geissler, P. (1990) A new method in floristic mapping as applied to an inventory of Swiss Bryophytes. In Vegetation and flora of temperate zones (U. Bohn and R. Neuhäusl, eds) pp. 21-32. The Hague: SPB Academic Publishing.Google Scholar
  48. Wagner, G. (1995) Verbreitungsatlas der Farn-und Blütenpflanzen der Schweiz. Nachträge und Ergänzungen, zweite Folge 1994. Bern: Zentralstelle der froristischen kartierung der Schweiz 156 pp.Google Scholar
  49. Walter, H. (1951) Grundlagen der Pflanzenverbreitung: 1. Teil: Standortslehre. Stuttgart: Ulmer, 525 pp.Google Scholar
  50. Ward, J.V. (1988) Riverine landscapes: biodiversity patterns, disturbance regimes, and aquatic conservation. Biol. Cons. 83, 269-278.Google Scholar
  51. Welten, M. (1971) Die Kartierung der Schweizer Flora. Boissiera 19, 97-105.Google Scholar
  52. Welten, M. and Sutter, R. (1982) Verbreitungsatlas der Farn-und Blütenpflanzen der Schweiz. Basel: Birkhäuser.Google Scholar
  53. Welten, M. and Sutter, R. (1984) Verbreitungsatlas der Farn-und Blütenpflanzen der Schweiz. Erste Nachträge und Ergänzungen. Bern: Zentralstelle der froristischen kartierung der Schweiz 48 p.Google Scholar
  54. White, P.S. and Miller, R.I. (1988) Topographic models of vascular plant richness in the Southern Appalachian high peaks. J. Ecol. 76, 192-9.Google Scholar
  55. Whittaker, R.H. (1977) Evolution of species diversity in land communities. Evol. Biol. 10, 1-67.Google Scholar
  56. Williams, C.B. (1964) Patterns in the balance of nature. New York: Academic Press, 324 pp.Google Scholar
  57. Wohlgemuth, T. (1993) Der Verbreitungsatlas der Farn-und Blütenpflanzen der Schweiz (Welten and Sutter, 1982) auf EDV. Die Artenzahlen und ihre Abhängigkeit von verschiedenen Faktoren. Bot. Helv. 103, 55-71.Google Scholar
  58. Woodward, F.I. (1987) Climate and plant distribution. Cambridge: Cambridge University Press, 174 pp.Google Scholar
  59. Zimmermann, K. and Kienast, F. (1995) Das Klima lässt sich nicht kartieren - Klimakarten werden gerechnet. Forsch.bereich Landsch.ökol. WSL 27, 1-3.Google Scholar

Copyright information

© Chapman and Hall 1998

Authors and Affiliations

  • THOMAS Wohlgemuth
    • 1
  1. 1.Swiss Federal Institute for Forest, Snow and Landscape ResearchBirmensdorfSwitzerland

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