Biodiversity and Conservation

, Volume 22, Issue 3, pp 591–614 | Cite as

The conservation of ground layer lichen communities in alvar grasslands and the relevance of substitution habitats

Original Paper

Abstract

Semi-natural calcareous grasslands (alvars) are biodiversity hotspots in Northern Europe, particularly for herb layer plants. In the last century, traditional management has ceased, and the area of grasslands has declined due to extensive encroachment. We were interested in the drivers of ground layer (alias terricolous or epigeic) lichen communities. Our survey consisted of 86 habitat fragments in western Estonia, covering four types of historic alvar grasslands and three types of alvar-like habitats. We found that the ground lichen communities were primarily soil-type-specific, but were also affected by historic disturbances and land use change. In contrast to knowledge about herb layer communities, for which shrub encroachment has been shown to be main driver, the increased density of the herb layer and the reduced diversity of microhabitats were major drivers for the ground layer lichen community. These drivers caused a decrease in species richness, but only within the species of conservation value, and also led to a shift in the composition of lichen growth form from the dominance of squamulose and crustose towards fruticose lichens. We conclude that the traditional practice of restoring alvars by cutting shrubs is insufficient to maintain ground layer lichen biodiversity. Alvar maintenance practices should include grazing, which creates various small-scale ground disturbances and increases microhabitat heterogeneity. Alvar-like habitats originating from large-scale historic disturbances appeared to be suitable for calcicolous epigeic lichens, and can therefore be considered to be temporary substitution habitats, i.e. refugia for the regional species pool.

Keywords

Habitat loss Historical continuity Land use change Lichen growth form Soil disturbances Species of conservation value 

Supplementary material

10531_2012_430_MOESM1_ESM.pdf (48 kb)
Supplementary material 1 (PDF 49 kb)

References

  1. Ahti T, Oksanen J (1990) Epigeic lichen communities of taiga and tundra regions. Vegetatio 86:39–70CrossRefGoogle Scholar
  2. Belnap J (2003) Factors influencing nitrogen fixation and nitrogen release in biological soil crusts. In: Belnap J, Lange OL (eds) Biological soil crusts: structure, function, and management. Springer, Berlin, pp 241–261CrossRefGoogle Scholar
  3. Belnap J, Eldridge DJ (2003) Disturbance and recovery of biological soil crusts. In: Belnap J, Lange OL (eds) Biological soil crusts: structure, function, and management. Springer, Berlin, pp 363–383CrossRefGoogle Scholar
  4. Belnap J, Lange OL (2003) Structure and functioning of biological soil crusts: synthesis. In: Belnap J, Lange OL (eds) Biological soil crusts: structure, function, and management. Springer, Berlin, pp 471–479CrossRefGoogle Scholar
  5. Blum O (1973) Water relations. In: Ahmajian V, Hale ME (eds) Lichens. Academic Press, New York and London, pp 381–400CrossRefGoogle Scholar
  6. Brown MJ, Jarman SJ, Kantvilas G (1994) Conservation and reservation of non-vascular plants in Tasmania, with special reference to lichens. Biodivers Conserv 3:263–278CrossRefGoogle Scholar
  7. Büdel B, Scheiddeger C (2008) Thallus morphology and anatomy. In: Nash TH III (ed) Lichen Biology, 2nd edn. Cambridge University Press, Cambridge, pp 40–69CrossRefGoogle Scholar
  8. Dengler J, Löbel S, Boch S (2006) Dry grassland communities of shallow, skeletal soils (Sedo-Scleranthenea) in northern Europe. Tuexenia 26:159–190Google Scholar
  9. Dufrêne M, Legendre P (1997) Species assemblages and indicator species: the need for a flexible asymmetrical approach. Ecol Monogr 67:345–366Google Scholar
  10. During HJ, Willems JH (1986) The impoverishment of the bryophyte and lichen flora of the Dutch chalk grasslands in the thirty years 1953–1983. Biol Conserv 36:143–158CrossRefGoogle Scholar
  11. Eldridge DJ, Rosentreter R (1999) Morphological groups: a framework for monitoring microphytic crusts in arid landscapes. J Arid Environ 41:11–25CrossRefGoogle Scholar
  12. Gilbert OL (1993) The lichens of chalk grassland. Lichenologist 25:379–414Google Scholar
  13. Helm A, Hanski I, Pärtel M (2006) Slow response of plant species richness to habitat loss and fragmentation. Ecol Lett 9:72–77PubMedGoogle Scholar
  14. Hill MO, Gauch HG (1980) Detrended correspondence analysis: an improved ordination technique. Vegetatio 42:47–58CrossRefGoogle Scholar
  15. Jeschke M, Kiehl K (2006) Effects of restoration and conservation measures on species diversity of vascular plants and cryptogams in newly created calcareous grasslands. Tuexenia 26:223–242Google Scholar
  16. Kattwinkel M, Biedermann R, Kleyer M (2011) Temporary conservation for urban biodiversity. Biol Conserv 144:2335–2343CrossRefGoogle Scholar
  17. Kohler F, Gillet F, Gobat JM et al (2006) Effect of cattle activities on gap colonization in mountain pastures. Folia Geobot 41:289–304CrossRefGoogle Scholar
  18. Kõlli R, Lemetti I (1999) Eesti muldade lühiiseloomustus I. Normaalsed mineraalmullad. Eesti Põllumajandusülikool, TartuGoogle Scholar
  19. Kukk T, Sammul M (2006) Area of seminatural Natura 2000 habitat types in Estonia. In: Sammul M (ed) Year-book of the Estonian Naturalists’ Society. Estonian Naturalists’ Society, Tartu, pp 114–158Google Scholar
  20. Laasimer L (1965) Eesti NSV taimkate. Valgus, TallinnGoogle Scholar
  21. Laasimer L (1975) Eesti lood ja loometsad, nende kaitse. In: Renno O (ed) Eesti loodusharulduste kaitseks. Valgus, Tallinn, pp 90–103Google Scholar
  22. Laasimer L (1981) Anthropogenous changes of plant communities and problems of conservation. In: Laasimer L (ed) Anthropogenous changes in the plant cover of Estonia. Academy of Sciences of the Estonian S.S.R, Tartu, pp 18–31Google Scholar
  23. Lange OL, Kilian E, Ziegler H (1986) Water vapor uptake and photosynthesis of lichens: performance differences in species with green and blue-green algae as phycobionts. Oecologia 71:104–110CrossRefGoogle Scholar
  24. Lázaro R, Cantón Y, Solé-Benet A et al (2008) The influence of competition between lichen colonization and erosion on the evolution of soil surfaces in the Tabernas badlands (SE Spain) and its landscape effects. Geomorphology 102:252–266CrossRefGoogle Scholar
  25. Löbel S, Denger J, Hobohm C (2006) Species richness of vascular plants, bryophytes and lichens in dry grasslands: the effects of environment, landscape structure and competition. Folia Geobot 41:377–393CrossRefGoogle Scholar
  26. McCune B, Mefford MJ (1999) PC-ORD. Multivariate analysis of ecological data, version 4. MjM Software Design, Gleneden Beach, OregonGoogle Scholar
  27. Meier E, Paal J (2009) Cryptogams in Estonian alvar forests: species composition and their substrata in stands of different age and management intensity. Ann Bot Fenn 46:1–20CrossRefGoogle Scholar
  28. Mielke PW (1984) Meteorological applications of permutation techniques based on distance functions. In: Krishnaiah PR, Sen PK (eds) Handbook of statistics, vol 4. Elsevier Science Publishers, Amsterdam, pp 813–830Google Scholar
  29. Ott S, Elders U, Jahns HM (1996) Vegetation of the rock-alvar of Gotland I microhabitats and succession. Nova Hedwigia 63:433–470Google Scholar
  30. Ott S, Elders U, Jahns HM (1997) Vegetation of the rock-alvar of Gotland II microclimate of lichen-rich habitats. Nova Hedwigia 64:87–101Google Scholar
  31. Paal J (1997) Eesti taimkatte kasvukohatüüpide klassifikatsioon. Keskkonnaministeerium. ÜRO Keskkonnaprogramm, TallinnGoogle Scholar
  32. Pärtel M, Kalamees R, Zobel M et al (1999) Alvar grasslands in Estonia: variation in species composition and community structure. J Veg Sci 10:561–570CrossRefGoogle Scholar
  33. Pärtel M, Helm A, Reitalu T et al (2007) Grassland diversity related to the Late Iron Age human population density. J Ecol 95:574–582CrossRefGoogle Scholar
  34. Petersen H, Jucevica E, Gjelstrup P (2004) Long-term changes in collembolan communities in grazed and non-grazed abandoned arable fields in Denmark. Pedobiol 48:559–573CrossRefGoogle Scholar
  35. Piqueray J, Bottin G, Delescaille L-M et al (2011) Rapid restoration of a species-rich ecosystem assessed from soil and vegetation indicators: the case of calcareous grasslands restored from forest stands. Ecol Indic 11:724–733CrossRefGoogle Scholar
  36. Poschlod P, WallisDeVries MF (2002) The historical and socioeconomic perspective of calcareous grasslands—lessons from the distant and recent past. Biol Conserv 104:361–376CrossRefGoogle Scholar
  37. Randlane T, Saag A (eds) (1999) Second checklist of lichenized, lichenicolous and allied fungi of Estonia. Folia Cryptog Estonica 35:1–132Google Scholar
  38. Randlane T, Jüriado I, Suija A et al (2008) Lichens in the new Red List of Estonia. Folia Cryptog Estonica 44:113–120Google Scholar
  39. Rosén E (1982) Vegetation development and sheep grazing in limestone grasslands of south Öland, Sweden. Acta Phytogeogr Suec 72:1–104Google Scholar
  40. Rosén E (1988) Shrub expansion in alvar grasslands on Öland. Acta Phytogeogr Suec 76:87–100Google Scholar
  41. Rosén E (1995) Periodic droughts and long-term dynamics of alvar grassland vegetation on Öland, Sweden. Folia Geobot Phytotax 30:131–140CrossRefGoogle Scholar
  42. Rosén E, Bakker JP (2005) Effects of agri-environment schemes on scrub clearance, livestock grazing and plant diversity in a low-intensity farming system on Öland, Sweden. Basic Appl Ecol 6:195–204CrossRefGoogle Scholar
  43. Rosén E, van der Maarel E (2000) Restoration of alvar vegetation on Öland, Sweden. Appl Veg Sci 3:65–72CrossRefGoogle Scholar
  44. Santesson R, Moberg R, Nordin A et al (2004) Lichen-forming and lichenicolous fungi of Fennoscandia. Uppsala University, UppsalaGoogle Scholar
  45. Schaefer CA, Larson DW (1997) Vegetation, environmental characteristics and ideas on the maintenance of alvars on the Bruce Peninsula, Canada. J Veg Sci 8:797–810CrossRefGoogle Scholar
  46. Smith CW, Aptroot A, Coppins BJ et al (2009) The lichens of Great Britain and Ireland. British Lichen Society, LondonGoogle Scholar
  47. Suija A, Leppik E, Jüriado I et al (2011) New Estonian records and amendments: lichenized, lichenicolous and allied fungi. Folia Cryptog Estonica 48:154–158Google Scholar
  48. Tomlinson S, Matthes U, Richardson PJ et al (2008) The ecological equivalence of quarry floors to alvars. Appl Veg Sci 11:73–82CrossRefGoogle Scholar
  49. WallisDeVries MF, Poschlod P, Willems JH (2002) Challenges for the conservation of calcareous grasslands in northwestern Europe: integrating the requirements of flora and fauna. Biol Conserv 104:265–273CrossRefGoogle Scholar
  50. Warren SD, Eldridge DJ (2003) Biological soil crusts and livestock in arid ecosystems: are they compatible? In: Belnap J, Lange OL (eds) Biological soil crusts: structure, function, and management. Springer, Berlin, pp 401–415Google Scholar
  51. Wells TCE, Sheail J, Ball DF et al (1976) Ecological studies on the porton ranges: relationships between vegetation, soils and land-use history. J Ecol 64:589–626CrossRefGoogle Scholar
  52. Willems JH (2001) Problems, approaches, and results in restoration of Dutch calcareous grassland during the last 30 years. Restor Ecol 9:147–154CrossRefGoogle Scholar
  53. Zobel M (1987) The classification of Estonian alvars and their plant communities. In: Laasimer L, Kull T (eds) The plant cover of the Estonian SSR flora, vegetation and ecology. Valgus, Tallinn, pp 28–45Google Scholar
  54. Zobel M, Otsus M, Liira J et al (2000) Is small-scale species richness limited by seed availability or microsite availability? Ecology 81:3274–3282CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Ede Leppik
    • 1
  • Inga Jüriado
    • 1
  • Ave Suija
    • 1
  • Jaan Liira
    • 1
  1. 1.Department of BotanyInstitute of Ecology and Earth Sciences, University of TartuTartuEstonia

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