At every visit, i strolled the entire site and needed bumble bees on the blooming herbs
We used graphic surveys to have bumble bees at each and every of the eight websites from inside the exact same around three census episodes once we mentioned flowery investment variety (twenty-eight Can get so you’re able to 7 June, 22-29 Summer, 22-31 July). Per of one’s about three bumble-bee studies, we went to per webpages 3 x, shortly after during all of three time episodes (0800-1100, 1100-1300, 1300-1700 period). Most of the sampling is carried out on the warm months that have temperatures anywhere between 19 and you will thirty two°C.
We trapped and you will noted for every bumble bee having a tiny mark of coloured correction liquid into the thorax to end counting anyone more often than once during a sample months at the web site. We submitted bumble bee kinds, status, additionally the plant varieties on which the fresh bumble-bee are located foraging and you may put-out new bee. I spent 31 min for every visit on a couple of internet sites which have a segmet of ?2,000 meters dos , 45 min within several 10,000-meters dos web sites, 90 min on two 31,000-yards dos internet, and you may 120 min from the one or two 70,000-yards dos websites. I looked at to own a sample go out bias playing with rarefaction (select Analytical Research)parisons from wealth regarding bees trapped by the hour so you’re able to capital philosophy otherwise environment versions removed prospective sampling date biases.
I understood bumble bees in this field having fun with Mitchell (1962) due to the fact an initial expert; to possess descriptions regarding regional species, we made use of Medler and you may Carney (1963).