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4 results for “Osmia cornifrons”
More than mesolectic: Characterizing the nutritional niche of Osmia cornifrons
<p>Characterizing the nutritional needs of wild bee species is an essential step to better understanding bee biology and providing suitable supplemental forage for at-risk species. Here, we aim to characterize the nutritional needs of a model solitary bee species, <em>Osmia cornifrons</em> (Radoszkowski), by using dietary protein-to-lipid ratio (P:L ratio) as a proxy for nutritional niche and niche breadth. We first identified the mean target P:L ratio (~3.02:1) and P:L collection range (0.75 to 6.26:1) from pollen provisions collected across a variety of sites and time points. We then investigated the P:L tolerance range of larvae by rearing bees in vitro on a variety of diets. Multifloral and single-source pollen diets with P:L ratios within the range of surveyed provisions did not always support larval development, indicating that other dietary components such as plant secondary compounds and micronutrients must also be considered in bee nutritional experiments. Finally, we used pollen metabarcoding to identify pollen from whole larval provisions to understand how much pollen bees used from plants outside of their host plant families to meet their nutritional needs, as well as pollen from individual forager bouts, to observe if bees maintained strict floral constancy or visited multiple plant genera per foraging bout. Whole larval provision surveys revealed a surprising range of host plant pollen use, ranging from ~5–70% of host plant pollen per provision. Samples from individual foraging trips contained pollen from multiple genera, suggesting that bees are using some form of foraging decision-making. Overall, these results suggest that <em>O. cornifrons</em> have a wide nutritional niche breadth, but while pollen P:L ratio tolerance is broad, a tolerable P:L ratio alone is not enough to create a quality diet for <em>O. cornifrons</em>, and the plant species that make up these diets must also be carefully considered.</p>
More than mesolectic: Characterizing the nutritional niche of Osmia cornifrons
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Data from: Introduced bees (Osmia cornifrons) collect pollen from both coevolved and novel host-plant species within their family-level phylogenetic preferences
<p><span><span><span><span><span><span><span><span><span><span><span>Studying the pollen preferences of introduced bees allows us to investigate how species utilize host-plants when establishing in new environments. <i>Osmia cornifrons</i> is a solitary bee introduced into North America from East-Asia for pollination of crops in the Rosaceae. We investigated whether <i>O. cornifrons</i> 1) more frequently collected pollen from host-plant species they coevolved with from their geographic origin, or 2) prefer hosts-plant species of specific plant taxa independent of origin. To address this question, using pollen metabarcoding we examined the identity and relative abundance of pollen in larval provisions from nests located in different habitats with varying abundance of East-Asian and non-Asian plant species. Our results show that <i>O. cornifrons</i> disproportionately, yet not exclusively, collected pollen from their native range. Plants in the family Rosaceae were their most preferred pollen hosts, where they differentially collected species native to East-Asia, Europe, or North America depending on the landscape. Our results suggest that while <i>O. cornifrons</i> more frequently collect pollen of East-Asian origin, the collection of pollen from novel species within their phylogenetic familial affinities can facilitate pollinator establishment. This phylogenetic preference highlights the effectiveness of <i>O. cornifrons</i> as crop pollinators of a variety of Rosaceae crops from different geographic origins. Ourresults imply that globalization of non-native plant species may ease the naturalization of their coevolved pollinators outside of their native range. </span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Introduced bees (Osmia cornifrons) collect pollen from both coevolved and novel host-plant species within their family-level phylogenetic preferences
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