Mountain grassland biodiversity: Impact of site conditions versus management type

Summary Grasslands of the Swiss Alps provide agricultural goods, ecological services, disaster protection, and scenic beauty. We identified influences of site conditions and management type on grassland biodiversity, and specifically evaluated the effectiveness of the agri-environmental programme in the Alps. Vascular plants and grasshoppers were mapped in conventionally managed cut meadows, cut meadows of the ecological compensation programme (ECA meadows), and conventionally managed pastures ( n =324). We determined climatic and topographic site conditions, quantified the degree of remoteness of all plots in GIS, and estimated the habitat diversity in the vicinity of the sampling sites. The data were analysed by discriminant analysis, rank-correlation analysis, non-parametric ANOVA, general linear models, and ANCOVA. Plant biodiversity hot spots were in economically unattractive, remote sites. These were the typical site conditions of ECA meadows. Hence we concluded that the ecological compensation programme was effectively ensuring management at these sites, and thus protecting mountain grassland plant species richness. Grasshoppers seemed not to benefit from mountain ECA meadows, which were probably often situated at the climatic limit of several species. Pastures were the most species rich management type (plants and grasshoppers), but conversion from cut grassland to pastures should be limited, as negative economic and ecological effects have been reported. We propose that the co-existence of well-managed pastures and long-term ECA meadows might best conserve mountain grassland biodiversity.

[1]  F. Herzog,et al.  Effectiveness of the Swiss agri‐environment scheme in promoting biodiversity , 2005 .

[2]  S. Dorn,et al.  Cross-taxon congruence of species diversity and community similarity among three insect taxa in a mosaic landscape , 2005 .

[3]  M. Pezzatti.  Einfluss der Erschliessung auf die Agrarstrukturen im Alpenraum: Eine agrarökonomische Analyse am Beispiel von vier Regionen in der Schweiz , 2001 .

[4]  S. Muller.  Diversity of management practices required to ensure conservation of rare and locally threatened plant species in grasslands: a case study at a regional scale (Lorraine, France) , 2002, Biodiversity & Conservation.

[5]  Rolf A. Groeneveld,et al.  Ecological Effectiveness of Agri‐Environment Schemes in Different Agricultural Landscapes in The Netherlands , 2004 .

[6]  T. Tscharntke,et al.  Grazing Intensity and the Diversity of Grasshoppers, Butterflies, and Trap‐Nesting Bees and Wasps , 2002 .

[7]  D. Kleijn,et al.  The conservation effects of meadow bird agreements on farmland in Zeeland, The Netherlands, in the period 1989–1995 , 2004 .

[8]  Beatriz Arroyo,et al.  A review of the abundance and diversity of invertebrate and plant foods of granivorous birds in northern europe in relation to agricultural change , 1999 .

[9]  J Hunt,et al.  The multi-disciplinary evaluation of a national agri-environment scheme. , 2003, Journal of environmental management.

[10]  Ann-Christin Weibull,et al.  Species richness in agroecosystems: the effect of landscape, habitat and farm management , 2003, Biodiversity & Conservation.

[11]  A. Lüscher,et al.  Botanical composition of grassland in the Alps as an indicator for changes in management. , 2004 .

[12]  T. Walter,et al.  Arthropod reaction to landscape and habitat features in agricultural landscapes , 2003, Landscape Ecology.

[13]  J. Bakker,et al.  Effects of long‐term cutting in a grassland system: perspectives for restoration of plant communities on nutrient‐poor soils , 2002 .

[14]  A. Lüscher,et al.  Effects of ecological compensation areas on species diversity in the Swiss grassland - an overview. , 2004 .

[15]  Dan Chamberlain,et al.  Declining Biodiversity in Agricultural Landscapes and the Effectiveness of Agri-environment Schemes , 2004, Ambio.

[16]  O. Eriksson.  The species-pool hypothesis and plant community diversity , 1993 .

[17]  Martin Zobel,et al.  Species pool: the concept, its determination and significance for community restoration. , 1998 .

[18]  A. Gibon,et al.  Agricultural abandonment in mountain areas of Europe: Environmental consequences and policy response , 2000 .

[19]  Erich Tasser,et al.  Impact of land use changes on mountain vegetation , 2002 .

[20]  Guido Van Huylenbroeck,et al.  Multifunctional agriculture: a new paradigm for European agriculture and rural development. , 2003 .

[21]  Gabriela Hofer,et al.  Effect of ecological compensation areas on floristic and breeding bird diversity in Swiss agricultural landscapes , 2005 .

[22]  M. Fischer,et al.  Local Extinctions of Plants in Remnants of Extensively Used Calcareous Grasslands 1950 –1985 , 1997 .

[23]  J. Bakker,et al.  Nature Management by Grazing and Cutting , 1989, Geobotany.

[24]  David Kleijn,et al.  Agri-environment schemes do not effectively protect biodiversity in Dutch agricultural landscapes , 2001, Nature.

[25]  Sonja Wipf,et al.  Effect of low-intensity grazing on the species-rich vegetation of traditionally mown subalpine meadows , 2002 .

[26]  Josef Nösberger,et al.  Biodiversity in grassland , 1998 .

[27]  M. Obrist,et al.  In search of the best correlates for local organismal biodiversity in cultivated areas , 1998, Biodiversity & Conservation.

[28]  M. Obrist,et al.  Regional biodiversity in an agricultural landscape: the contribution of seminatural habitat islands , 2003 .

[29]  Sylvie Ladet,et al.  Agricultural land-use change and its drivers in mountain landscapes: A case study in the Pyrenees , 2006 .

[30]  Y. Willi,et al.  Enhancement of Farmland Biodiversity within Set‐Aside Land , 2004 .

[31]  T. Dutoit,et al.  A six-year experimental restoration of biodiversity by shrub-clearing and grazing in calcareous grasslands of the French Prealps , 2004, Biodiversity & Conservation.

[32]  B. Schmid,et al.  Conservation of arthropod diversity in montane wetlands: effect of altitude, habitat quality and habitat fragmentation on butterflies and grasshoppers , 1999 .

[33]  F. Herzog,et al.  Mixed biodiversity benefits of agri-environment schemes in five European countries. , 2006, Ecology letters.

[34]  M. Hohl.  Spatial and temporal variation of grasshopper and butterfly communities in differently managed semi-natural grasslands of the Swiss Alps , 2006 .

[35]  V. Wolters,et al.  Landscape structure as an indicator of biodiversity: matrix effects on species richness , 2003 .

[36]  A. Mazumder,et al.  REVERSAL OF GRAZING IMPACT ON PLANT SPECIES RICHNESS IN NUTRIENT‐POOR VS. NUTRIENT‐RICH ECOSYSTEMS , 1998 .

[37]  A. Magurran.  Ecological Diversity and Its Measurement , 1988, Springer Netherlands.

[38]  J. Pykälä,et al.  Effects of restoration with cattle grazing on plant species composition and richness of semi-natural grasslands , 2003, Biodiversity & Conservation.

[39]  William J. Sutherland,et al.  How effective are European agri‐environment schemes in conserving and promoting biodiversity? , 2003 .

[40]  M. Luoto,et al.  Decline of landscape-scale habitat and species diversity after the end of cattle grazing , 2003 .

[41]  S. Faeth,et al.  Effect of Vertebrate Grazing on Plant and Insect Community Structure , 1999 .

[42]  G. Fry,et al.  Estimating the consequences of land-use changes on butterfly diversity in a marginal agricultural landscape in Sweden , 2005 .

[43]  S. Studer.  The influence of management on the floristic composition of hay meadows , 2000 .

[44]  A. Stampfli,et al.  Plant species decline due to abandonment of meadows cannot easily be reversed by mowing. A case study from the southern Alps , 1999 .