Table 2 GLMM of main effects of plant richness, leaf area index and ANPP on focal species cover, under hay harvest vs. no hay harvest across the precipitation gradient. Significant P (≤ 0.05) shown in bold.

Species	Community richness		Leaf area index		ANPP (g m⁻²)
Species	Chisq	P	Chisq	P	Chisq	P
*Ambrosia psilostachya*
Hay harvest	0.32	0.57	0.04	0.84	0.29	0.59
No hay harvest	0.76	0.38	1.04	0.30	16.91	< 0.001
*Croton monanthogynus*
Hay harvest	0.07	0.78	5.17	0.02	46,174,087	< 0.001
No hay harvest	0.11	0.74	5.54	0.11	0.69	0.40
*Erigeron strigosus*
Hay harvest	3.40	0.06	0.09	0.76	0.97	0.32
No hay harvest	6.92	< 0.01	0.02	0.90	51.99	< 0.001
*Solidago nemoralis*
Hay harvest	1.57	0.21	13.69	< 0.001	52,869	< 0.001
No hay harvest	2.36	0.12	0	0.99	40.82	< 0.001
*Symphyotrichum ericoides*
Hay harvest	6436.9	< 0.001	0.09	0.75	< 0.01	0.93
No hay harvest	0.01	0.93	64,687	< 0.001	0.49	0.48
*Dichanthelium oligosanthes*
Hay harvest	< 0.01	0.98	436.51	< 0.001	0.16	0.69
No hay harvest	0.49	0.49	4.70	0.3	3.19	0.07
*Schizachyrium scoparium*
Hay harvest	< 0.01	0.98	2.52	0.11	0.04	0.84
No hay harvest	0.03	0.86	< 0.01	0.93	0.99	0.32
*Sorghastrum nutans*
Hay harvest	0.81	0.36	1.27	0.26	3.80	0.05
No hay harvest	< 0.01	0.93	0.45	0.50	0.10	0.74
*Sporobolus compositus*
Hay harvest	0.02	0.89	0.11	0.74	0.49	0.48
No hay harvest	0.04	0.85	0.70	0.40	0.92	0.34

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