Table 1.

Abundance/density thresholds used to classify the COTS populations during scientific surveys.

Classification Level	Density (COTS.ha−1)	Abundance equiv. (COTS.10 min−1)
Non outbreak	<15a	0–1
Potential outbreak	15–100b	2–5
Confirmed outbreak	>100c	>5

^aEndean 1974; Keesing 1990; Clark & Weitzman 2006.

^bDana et al. 1972; Keesing and Lucas 1992; Moran and De’ath 1992.

^cPearson and Endean 1969; Glynn 1973; Endean and Stablum 1975.