Floral traits are associated with the quality but not quantity of heterospecific stigmatic pollen loads

BMC Ecology

Table 1 Descriptive results of sampling and pollen transfer within all nine communities

	EB I	EB II	EB lII	HT I	HT II	HT III	RB I	RB II	RB III
No. Species*	4 (4)	17 (20)	7 (9)	7 (9)	16 (19)	17 (19)	8 (9)	16 (20)	22 (24)
Total no. stigmas	48	160	46	72	178	156	71	162	224
Total no. pollen grains	11,030	21,564	8373	8409	13,956	11,279	9446	9324	23,573
Total no. CP grains	10,472	20,712	8187	8056	12,211	10,883	9280	8668	21,896
Total no. HP grains	558	852	186	353	1745	396	166	656	1677
Total no. links⁺	8	48	14	12	57	57	11	49	91
%Donor	25	43.75	28.57	42.86	20	47.06	37.5	37.5	36.36
%Receptor	50	56.25	57.14	57.14	73.33	47.06	25	56.25	54.54
%Donor-Receptor	25	0	14.29	0	6.77	5.88	37.5	6.25	9.1
Corr. In- and out-degree	− 0.30^NS	− 0.23^NS	0.62^NS	− 0.11^NS	− 0.23^NS	− 0.09^NS	− 0.53^NS	− 10.19^NS	− 0.10^NS
Modularity	0	0.38	0.1	0.25	0.47	0.48	0.31	0.56	0.47

EB = Eselburger Tal, HT = Hirschtal, RB = Reichenbach. Roman numerals show sampling date: I = early summer, II = mid-summer, III = late summer. No. species = Total number of species, Total no. stigmas = Total number of collected stigma, Total no. pollen grains = Total number of pollen grains found on all stigmas, Total no. CP grains = Total number of CP grains found on all stigmas, Total no. HP grains = Total number of HP grains found on all stigmas, Total no. links = Total number of links found in the plant-plant pollen transfer network, %Donor = Percentage hub-donor species in the network, i.e. species that donated HP to more species than from which they received HP, %Receptor = Percentage receptor species in the network, i.e. species that received HP from more species than to which they donate HP(??), %Donor-Receptor = Percentage of species that donated and received pollen from the same number of species. Corr. In- and out-degree = Pearson product correlation r for in- and out-degree for each species within a community; ns non-significant. Modularity = Modularity for HP transfer network calculated using the optimization algorithm of Blondel et al. [43]
*No. species = Number of species from which stigmas were collected (Number of flowering plant species. Some species were under protection or only present with < 3 individuals and were excluded)
⁺Total no. links = in each network, including links resulting from species that were not on our plots

ISSN: 1472-6785