Table 1.

Two-way ANOVA statistics for frequency and density dependence of selection coefficients in Oxyrrhis marina microcosms. (Model results are presented with interactions, where significant, or otherwise with both factors.)

target strain	competitor strain	factor	d.f.	sum squares	mean square	f	p-value
ROS03	EST02	density	2	0.3955	0.1978	8.984	0.0014
		frequency	2	0.1108	0.0554	2.517	0.1037
		residuals	22	0.4843	0.0220
BGN01	TMO01	density	2	0.2115	0.1058	3.042	0.0682
		frequency	2	1.8189	0.9094	26.159	<0.0001
		residuals	22	0.7649	0.3048
EST02	BOD02	density	2	0.0249	0.0124	0.697	0.5111
		frequency	2	0.0237	0.0119	0.664	0.5267
		density × frequency	4	0.2913	0.0728	4.080	0.0158
		residuals	18	0.3213	0.0179
PLY01	BGN01	density	2	0.3337	0.1669	16.090	<0.0001
		frequency	2	0.1439	0.0720	6.940	0.0058
		density × frequency	4	0.2694	0.0673	6.494	0.0020
		residuals	18	0.1867	0.0104
EST02	BGN01	density	2	0.0070	0.0035	0.161	0.852
		frequency	2	0.0612	0.0306	1.413	0.265
		residuals	22	0.4767	0.0216
FAR01	EST02	density	2	0.0389	0.0194	0.767	0.476
		frequency	2	0.0677	0.0339	1.336	0.283
		residuals	22	0.5574	0.0253