We caught a maximum of 943 bumble bees owned by 7 types

Range go out sampling prejudice are tested of the comparing counted variety richness regarding web sites that have rarefacted species richness. Throughout the rarefaction study, i put try dimensions at the 21 some one, you to below the minimum number available at this site that have the brand new Austrijska djevojke tako lijepe fewest bumble bees. Rank order of species richness on web sites remained an identical with the exception of Solon Prairie, and that diminished several urban centers from inside the relative rating, proving little aftereffect of sampling work towards the varieties 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 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.).

New proportional shipment off wealth each and every bumble-bee species at each one of seven tall grass prairie web sites in eastcentral Iowa. Get a hold of Desk 1 to own webpages name abbreviations.

The LRI of the done surroundings which have and you will without any webpages integrated in addition to displayed high effects towards the bumble bee assortment ( Desk 4) however, weren’t extreme advancements over the design that have grasslands LRI and you can wealth

On average, new land nearby the websites try controlled from the corn and you can soybean line vegetation (41%), which have an additional 31% consisting of combined grasslands (fallow and you will grazed pastures, alfalfa, etc.) and you may 17% combined woodland. Of the four mutual landscaping groups, grasslands contributed normally 51% of the complete LRI really worth. Yet not, the newest part of more landscape categories differed considerably inside the web sites. Such, from the 700-yards radius, components instead of floral information together with farming sphere, channels, and you may ponds, accounted for almost 85% of land encompassing Sioux Path, but just ?5% of your Poultry Creek landscape. Similarly, 40% of your land on Turkey Creek try woodland, while Solon Prairie’s landscape had Table 4; Fig. 2). During the five hundred-meters distance, the fresh LRI of your own grasslands additionally the wealth out-of bumble-bee-went along to tips in the site were one another tall regarding design predicting bumble-bee diversity; at the 700 meters, the fresh new explanatory electricity of one’s model diminished ?10%, and while the brand new LRI out-of grasslands was significant, new abundance out-of bumble-bee-made use of floral resources in the website merely exhibited a development when you look at the the newest design. The new ratio of the difference told me from the LRI of your grasslands is 2-3 minutes compared to wealth regarding bumble bee info in the web site at two different radii ( Fig. 3a). When thickness off blooming ramets try replaced with variety about a lot more than models, density failed to lead significantly on habits (all the P > 0.50). We as well as authored activities in which i replaced this new LRI from new grasslands towards the portion of the fresh landscape from inside the grassland encompassing but not for instance the web site to determine when it cruder level regarding information try sufficient to expect variety. In the 700-yards distance, brand new model playing with per cent grasslands try tall, although explanatory stamina of one’s model is actually lower than the fresh design utilising the LRI from grasslands. The latest model playing with % grasslands at the 500 m was not extreme (r dos = 0.55, P = 0.087).