... time intervals in the same area (Fischer and Stocklin, 1999). Habitat frag-mentation combined with changes in grassland management and the land-scape context have resulted in significant increases ... grasslands. Maintenance of ade-quate management through disturbance regimes involving grazing, mowing, 920 103_CRC20_0904_CH03 1/13/01 10:44 AM Page 52 SPECIES DIVERSITY IN GRASSLANDS 53or burning ... species occur-ring in a grassland was greater in more diverse grasslands (i.e., a “samplingeffect”) providing community recovery insurance against climatic extremes. In contrast, year-to-year variability...