We caught a maximum of 943 bumble bees belonging to 7 varieties

Range day testing prejudice are looked at because of the contrasting counted types richness out of internet that have rarefacted variety fullness. From the rarefaction studies, we place shot size during the 21 some one, that less than the minimum amount discovered at the website with the brand new fewest bumble bees. Review acquisition out of types richness into web sites stayed an identical apart from Solon Prairie, which reduced several metropolitan areas from inside the relative rank, demonstrating absolutely nothing effect of testing energy into kinds fullness.

Overall performance

Species richness ranged from five to eight species per site, and log₂ Shannon-Wiener diversity across the eight sites ranged from 2.05 to 2.69. Five species common to all sites were B. bimaculatus Cresson, B. impatiens Cresson, B. pensylvanicus (DeGeer), B. auricomus (Robertson), and B. griseocollis (DeGeer), but the abundance of individuals among bumble bee species differed greatly between sites ( Fig. 1). We observed bumble bees on 43 of the 150 flowering species found at the Peruanski vruД‡e Еѕene sites. The percentage of native plant species among the 43 species visited was similar to their overall percentage in the combined flora of the sites (80 versus 77%, respectively). All of the plants on which bees were caught were herbaceous perennials or shrubs, except for one annual species (Melilotus alba L.).

The proportional delivery out-of variety of each and every bumble bee kinds on every one of eight extreme lawn prairie sites in the eastcentral Iowa. Come across Dining table step one for web site label abbreviations.

Brand new LRI of the over surroundings that have and you can without having any web site provided as well as presented significant outcomes on bumble-bee variety ( Dining table cuatro) however, weren’t tall developments along the model that have grasslands LRI and you may wealth

Typically, the new surroundings surrounding the websites try controlled from the corn and you will soybean row plants (41%), having an extra 29% comprising shared grasslands (fallow and you can grazed pastures, alfalfa, an such like.) and you will 17% combined forest. Of your four joint landscape kinds, grasslands shared an average of 51% of overall LRI really worth. Yet not, the fresh new part of additional landscaping kinds differed considerably in the internet. Like, from the 700-m radius, section as opposed to floral tips in addition to farming fields, paths, and you may lakes, accounted for nearly 85% of one’s surroundings surrounding Sioux Method, however, simply ?5% of your own Chicken Creek surroundings. Furthermore, 40% of the landscaping in the Turkey Creek try forest, while Solon Prairie’s landscaping had Dining table 4; Fig. 2). During the five-hundred-yards distance, the fresh new LRI of the grasslands as well as the abundance away from bumble-bee-visited information within site were both extreme regarding design anticipating bumble-bee range; during the 700 yards, brand new explanatory electricity of one’s model diminished ?10%, and you may whereas brand new LRI of grasslands are tall, the abundance out-of bumble-bee-used floral tips from the site just displayed a pattern in the the fresh model. New proportion of your variance informed me by the LRI of one’s grasslands is 2-3 moments that of abundance away from bumble bee resources within web site within a couple some other radii ( Fig. 3a). When thickness out-of flowering ramets was replaced with variety in the a lot more than models, occurrence didn’t lead significantly into the activities (all of the P > 0.50). We along with authored habits in which i replaced the LRI out-of the newest grasslands on the part of the fresh land during the grassland encompassing however for instance the webpages to choose if it cruder measure out-of resources was adequate to expect assortment. On 700-yards radius, brand new design having fun with percent grasslands try high, nevertheless explanatory stamina of one’s design was below the new design utilizing the LRI out of grasslands. New model having fun with percent grasslands within 500 meters wasn’t significant (r 2 = 0.55, P = 0.087).