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Luck (2005) An introduction to ecological thresholds. Biol. Conserv. 124, 299-300.
Where community threshold patterns exist, the imminent challenge is to identify the mechanism(s) that underlies these patterns. That is, why does a threshold response occur?

Lindenmayer & Luck (2005) Synthesis: Thresholds in conservation and management. Biol. Conserv. 124, 351-354.
We believe that although the threshold concept is an appealing one and there is some empirical evidence to support it in some
landscapes, it is not free of problems...