Multi-response permutation procedures (MRPP) were used to test differences in the floristic composition among gap types using post hoc pairwise comparison (function mrpp in Vegan, Bray–Curtis distance, 999 permutations, weighted by group size; Oksanen et al. 2011).
permutations如何翻译呢？

To know if the gap size was influencing species richness we used the SLOSS analysis.This method quantifies whether a single large or several small areas are more suitable to conserve species richness。
SLOSS是软件名称？还是分析方法？