Assessing a Bayesian Approach for Detecting Exotic Hybrids between Plantation and Native Eucalypts

Table 1

Summary of samples used to create range wide microsatellite databases for six Eucalyptus species in order to develop a model for identifying hybrids with E. globulus. All the species are members of the subgenus Symphyomyrtus, and their lower level taxonomy is given according to Euclid [12]; see Appendix  1 for more details. Also given for each species is the number of pure samples; the number of pedigreed and putative hybrid samples with E. globulus; their co-occurrence with E. globulus; reported hybrids with E. globulus; the similarity in their seedling morphology to E. globulus; and the source of samples.

Species	Taxonomy (section series)	n pure samples	n pedigreed hybrids	n putative hybrids	Naturally co-occur	Hybrids with E. globulus	Seedling morphology	Sample source
E. camaldulensis	Exsertaria Rostratae	97	2	4	No	Natural^a and manipulated	Different	[37]; this study
E. cypellocarpa	Maidenaria Globulares	97	—	7	Yes	Natural	Similar	This study
E. globulus	Maidenaria Globulares	87	—	—	—	—	—	[38–41]; this study
E. nitens	Maidenaria Globulares	88	28	—	No	Manipulated	Similar	[41, 42]
E. ovata	Maidenaria Foveolatae	100	2	—	Yes	Natural and manipulated	Different	[43]; this study
E. viminalis	Maidenaria Viminales	87	3	4	Yes	Natural and manipulated	Different^b	[43]; this study
Hybrids total	—	50	35	15	—	—	—	—
Total		606	—	—	—	—	—	—

 ^aNatural E. camaldulensis × globulus hybrids have been found where E. globulus is exotic [31].
^bThe seedling morphology of E. viminalis is easily distinguishable from E. globulus, but several key characters are similar enough to make hybrid identification problematic.