Extended Data Table 1. ANOVA results for annual nectar productivity, species nectar diversity and functional nectar diversity.

a, 2007 values according to habitat. The linear mixed effect models were performed on data from 2576 non-linear plots surveyed in 2007. b, 2007 values according to habitat and location. The linear mixed effect models were performed on data from 4527 plots (2576 non-linear plots and 1951 linear plots) surveyed in 2007. c, 1978-2007 values according to habitat and year. The linear mixed effect models were performed on data from 768 shared plots surveyed in 1978, 1990, 1998 and 2007. The annual nectar productivity was systematically log10 (x+1) transformed. See Supplementary Table 1 and Supplementary Table 3 for sample sizes.

a
Response variable	Effect	df	F value	P-value
Nectar productivity	Habitat	10	69.643	<.0001
Species nectar diversity	Habitat	10	19.923	<.0001
Functional nectar diversity	Habitat	10	24.150	<.0001

b
Response variable	Effect	df	F value	P-value
Nectar productivity	Habitat	10	75.081	<.0001
	Location	1	0.560	0.455
	Habitat:Location	10	63.519	<.0001
Species nectar diversity	Habitat	10	22.061	<.0001
	Location	1	0.147	0.701
	Habitat:Location	10	10.396	<.0001
Functional nectar diversity	Habitat	10	23.677	<.0001
	Location	1	2.158	0.142
	Habitat:Location	10	15.810	<.0001

c
Response variable	Effect	df	F value	P-value
Nectar productivity	Habitat	10	26.860	<.0001
	Year	3	1.473	0.220
	Habitat:Year	30	1.793	0.005
Species nectar diversity	Habitat	10	5.137	<.0001
	Year	3	2.600	0.050
	Habitat:Year	30	2.523	<.0001
Functional nectar diversity	Habitat	10	3.517	0.0001
	Year	3	1.987	0.114
	Habitat:Year	30	1.725	0.009