April 24, 2024 Pierce, N. A., S. R. Archer, B. T. Bestelmeyer and D. K. James. 2018. Grass-shrub competition in arid lands: An overlooked driver in grassland–shrubland state transition?. Ecosystems 1-10. Home » Pierce, N. A., S. R. Archer, B. T. Bestelmeyer and D. K. James. 2018. Grass-shrub competition in arid lands: An overlooked driver in grassland–shrubland state transition?. Ecosystems 1-10.