Table 3.

Summary of Laricobius spp. adult subterranean survivorship at the Virginia Tech insectary for each year and species and Pearson’s correlation coefficient (Survivorship vs. Median Days Underground). Correlation coefficients averages from 2005 to 2019 are weighted by the number of data points used to calculate each year’s correlation

				Survivorship vs. median days underground
Year	Species	Subterranean	Median days	(Pearson’s correlation)
		survivorship (%)	Underground1	Soil containers (n)	Coefficient (r)	P-value
2004	LN	31.6	NA	NA	NA	NA
2005	LN	17.7	197	16	0.51	0.043*
2006	LN	15.1	184	34	0.44	0.009*
2007	LN	37.0	193	199	0.54	<0.001*
2008	LN	44.6	178	237	0.46	<0.001*
2009	LN	40.8	191	160	0.84	<0.001*
2010	LN	69.8	199	191	0.63	<0.001*
2011	LN	46.7	196	40	0.81	<0.001*
	LO	21.1	219	40	0.63	<0.001*
2012	LN	44.2	211	16	0.02	0.951
	LO	22.4	227	86	−0.04	0.720
2013	LN	51.2	207	72	0.36	<0.001*
	LO	42.9	221	176	0.31	<0.001*
2014	LN	49.3	213	31	0.25	0.179
	LO	29.1	187	162	0.59	<0.001*
2015	LN	23.0	202	43	0.51	<0.001*
	LO	57.6	250	76	0.50	<0.001*
2016	LN	55.9	237	14	0.28	0.341
	LO	39.1	227	204	0.45	<0.001*
2017	LN	30.0	195	63	0.36	0.004*
	LO	27.0	205	145	0.50	<0.001*
2018	LO	35.8	216	201	0.37	<0.001*
2019	LN	39.0	165	4	−0.86	0.136
	LO	30.1	178	71	−0.53	<0.001*
2004–2019	LN	39.7	198	1120	0.58a	<0.001* a
2011–2019	LO	33.9	214	1161	0.37a	<0.001* a

LN = Laricobius nigrinus.

LO = Laricobius osakensis.

n = Total number of soil containers.

¹ = Julian date.

*Statistically significant P-value (<0.05).

^aCalculated using Fisher’s z′ transformation.