01871nas a2200169   4500008004500000020001400045245011300059210006900172260001000241300001200251490000700263520131700270100003001587700002201617700002001639856004201659       2002                        Engldsh    a0307-694600aContrasting frequencies of parasitism and host mortality among phorid and conopid parasitoids of bumble-bees0 aContrasting frequencies of parasitism and host mortality among p  cApril  a229-2370 v273 a1. Phorid (Diptera, Phoridae) and conopid (Diptera, Conopidae) parasitism among four North American bumble-bee (Hymenoptera, Apidae) species was investigated. Male bumble-bees experienced a significantly higher incidence of parasitism by the phorid, Apocephalus borealis Brues, and a significantly lower incidence of parasitism by the conopid, Physocephala texana Williston, than did workers. 2. The incidence of parasitism by A. borealis and P. texana varied between bumble-bee sexes and species in patterns that did not reflect differences in relative host abundance. Differences in foraging behaviour between bumble-bee workers and males, as well as between species, may explain these results. 3. Bumble-bee workers and males parasitised by A. borealis had significantly shorter lifespans than unparasitised bees. Based on previous estimates of bumble-bee mortality, A. borealis parasitism may reduce worker lifespans by up to 70%. In contrast, the mortality rate of bees parasitised by P. texana was not significantly different from that of unparasitised bees. 4. These results contrast with previous work highlighting the importance of conopid parasitism to bumble-bee populations, and suggest that phorid parasitism may impose greater costs to bumble-bees than does conopid parasitism in local populations.1 aOtterstatter, Michael, C.1 aWhidden, Troy, L.1 aOwen, Robin, E.  u<Go to ISI>://ZOOREC:ZOOR13800037469 00506nas a2200121   4500008004100000245009500041210006900136300001200205490000700217100002000224700001900244856012100263       2000                        eng d00aAn experimental test of potential host range in the ant parasitoid Apocephalus paraponerae0 aexperimental test of potential host range in the ant parasitoid   a332-3400 v251 aMorehead, S., A1 aFeener, D., H.  uhttps://diptera.myspecies.info/content/experimental-test-potential-host-range-ant-parasitoid-apocephalus-paraponerae