Table 1. Summary information of the 14 sampling localities for M. alternatus, arranged by the geographical regions within mainland China^*.

Region	Code	Site (province: locality)	Coordinates	Port	PWN	GDP	RFT
Eastern	JS	Jiangsu: Liyang	31°18′ N, 119°27′ E	1	1	2052.93	305.10
	SD	Shandong: Changdao	37°55′ N, 120°44′ E	1	1	2081.32	661.37
	ZJ	Zhejiang: Fuyang	30°02′ N, 119°57′ E	1	1	1470.77	358.48
	FJ	Fujian: Quanzhou	24°54′ N, 118°35′ E	1	1	773.46	172.16
Southern	GD	Guangdong: Guangzhou	23°07′ N, 113°15′ E	1	1	2412.89	396.87
Central	AH	Anhui: Huangshan	29°42′ N, 118°20′ E	0	0	625.58	279.01
	HA	Henan: Queshan	32°49′ N, 113°51′ E	0	1	1196.59	318.00
	HB	Hubei: Yichang	30°52′ N, 110°58′ E	1	1	804.91	168.85
	HN	Hunan: Zhangjiajie	29°07′ N, 110°28′ E	0	0	780.28	175.62
	JX	Jiangxi: Ji’an	27°02′ N, 114°54′ E	0	1	457.92	126.00
Southwestern	CQ	Chongqing: Beibei	29°48′ N, 106°23′ E	1	0	368.08	86.29
	GX	Guangxi: Yongfu	24°58′ N, 109°59′ E	1	0	457.14	137.79
	GZ	Guizhou: Zunyi	27°43′ N, 106°55′ E	0	1	228.62	66.12
	YN	Yunnan: Lunan	24°45′ N, 103°15′ E	0	0	392.04	69.34

^*Port indicates whether there was a marine port adjacent to the sampling site, 0 = no, 1 = yes (http://ports.com/browse/asia/china). A trapping site was considered to have an “adjacent” port if the port was located within the same county or city as the collecting site. PWN refers to the historical status of pinewood nematode (PWN) infestation within the same county as where the trapping occurred: 0 = not infested, 1 = infested as of 2012 [5]. GDP values are the 11-year average for the regional gross domestic product (billion yuan) of each of the 14 provinces, NBSC 2001–2011[36]–[46]. RFT values were the 10-year average values of the regional freight turnover (billion tkm) for the 14 sampled provinces, NBSC 2001–2011[36]–[46].