Key points are not available for this paper at this time.
E. M. Castellanos, M. E. Figueroa, A. J. Davy, Nucleation and Facilitation in Saltmarsh Succession: Interactions between Spartina Maritima and Arthrocnemum Perenne, Journal of Ecology, Vol. 82, No. 2 (Jun., 1994), pp. 239-248
Castellanos et al. (1994) studied this question.