TABLE 4.

Presence or absence of S. marcescens in Florida Keys canal samples determined by qPCR detection

Site	Presence or absence of S. marcescensa
	2011		2012			2013
	Spring	Summer	Winter	Spring	Summer	Winter	Spring	Summer
Upper Keys
Sexton Cove	−	−	−	—	—	−	−	−
Tropical Lane	+	−	−	—	—	+	+	+
Lower Keys
Blue Hole	−	−	−	—	+	+	−	+
Eden Pines	−	−	−	—	+	+	+	+
Doctors Arm	−	+	−	—	+	+	+	+

^a+, present; −, absent; —, no sample collected.