Table 3: Weight (mg) of desiccated pollen per flower head on each day after the initiation of flowering (see Figure 2(a) for each species). Mean ± standard deviation of five flower heads. Average pollen production (P) was used to calculate pollen availability within a 50 × 100 m quadrat (cf. Table 4). Names of flowering species are arranged in descending order average pollen production.

Flowering sp.Days from the initiation of flowering Average pollen productin (P)

Vicia cracca33.26±41.934.30±18.6122.83±9.1133.50±47.4619.34±30.7713.55±3.6426.13±8.80
Rosa rugosa26.96±22.1413.48±14.989.38±4.034.22±3.542.53±0.9211.31±9.76
Rosa parvifolius12.60±8.5915.48±13.569.25±32.517.72±3.2911.26±3.47
Melilotus suaveolens1.99±1.423.05±1.2410.00±1.6513.04±4.1318.22±8.339.05±1.923.42±16.586.76±4.54
Picris hieracioides8.15±1.874.58±2.132.95±1.492.64±1.814.44±2.20
Lathyrus japonicus011.84±30.67002.96±0.00
Oenothera biennis0.58±0.241.97±1.680.93±0.541.15±1.16
Calystegia soldanella4.41±0.950.45±0.300.93±0.84