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  • Influence
The pollination efficiency of the squash bee (Peponapis pruinosa) and the honey bee (Apis mellifera) on summer squash (Cucurbita pepo)
Observations were made and experiments conduct ed to ascertain if the specialized squash bee, P. pruinosa, is su perior to the honey bee as a pollinator of summer squash. Three parametersExpand
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SEX RATIO, BODY SIZE AND SEASONALITY IN A SOLITARY BEE, OSMIA LIGNARIA PROPINQUA CRESSON (HYMENOPTERA: MEGACHILIDAE)
Although sex ratio and investment theory have been recently refined and made more mathematically rigorous (Hamilton, 1967; Leigh, 1970; Trivers, 1972; Trivers and Hare, 1976; Charnov, 1978; MacNair,Expand
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Pollen‐host specificity and evolutionary patterns of host switching in a clade of specialist bees (Apoidea: Diadasia)
We examined the levels of pollen-host specificity in North American Diadasia (Hymenoptera: Apoidea), a clade of specialist bees. We analysed the scopal pollen loads of 409 individuals representing 25Expand
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Effect of Intertunnel Distance and Nest-Surface Aspect on Progeny Production Rate and Sex Ratio in the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae)
Populations of the alfalfa pollinator, Megachile rotundata (F.), nest in dense aggregations in artificial shelters in alfalfa fields. The closeness of the nest tunnels in these shelters (5–10 mmExpand
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SEX RATIO, PARENTAL INVESTMENT, AND INTERPARENT VARIABILITY IN NESTING SUCCESS IN A SOLITARY BEE
Observations of uniquely marked females of the solitary, twig‐nesting bee, Osmia bruneri, were conducted under greenhouse conditions to test several predictions of sex‐ratio and parental‐investmentExpand
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Interspecific Differences in the Relative Importance of Pollen and Nectar to Bee Species Foraging on Sunflowers
We examined predictions of the theory of energy maximization for a field population of several species of bees foraging for nectar and pollen on a planting of six male-sterile and one male-fertileExpand
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Temporal variability in the sex ratio of a non-social bee, Osmia liqnaria propinqua Cresson: Extrinsic determination or the tracking of an optimum?
Six years data on the sex ratio of Osmia lignaria obtained from several sites in northern Utah and southern Idaho, was used to test Fisher's theory of an equilibrium sex ratio. The results emphasizeExpand
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Sublethal Effects of Carbaryl Bran Bait on Nesting Performance, Parental Investment, and Offspring Size and Sex Ratio of the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae)
Megachile rotundata (F.) was used to study sublethal effects of carbaryl bran bait on a representative solitary nesting bee. Adult females were fed a 25% honey solution contaminated with 2 mg ofExpand
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Founding and Usurping: Equally Efficient Paths to Nesting Success in Osmia lignaria propinqua (Hymenoptera: Megachilidae)
We examined usurpation of nest holes of four diameters in a greenhouse population of the xylophilous bee, Osmia lignaria propinqua Cresson. Although vacant holes were always in unlimited supply, ≈25%Expand
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