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The evolution of a pollen diet: Host choice and diet breadth of Andrena bees (Hymenoptera: Andrenidae)
We investigate of two aspects of pollen diet of Andrena bees: the evolution of diet breadth within nearctic representatives of the genus, which includes both polylectic and oligolectic species; andExpand
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Species Relationships in Krameria (Krameriaceae) Based on ITS Sequences and Morphology: Implications for Character Utility and Biogeography
Abstract The Krameriaceae is a monotypic family of 18 species distributed in the warm arid and semiarid regions of North and South America. We have used sequence data from the internal transcribedExpand
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Phylogeny of the Callandrena subgenus of Andrena (Hymenoptera: Andrenidae) based on mitochondrial and nuclear DNA data: polyphyly and convergent evolution.
We propose a phylogenetic hypothesis of relationships within Callandrena, a North American subgenus of the bee genus Andrena, based on both mitochondrial and nuclear DNA sequences. Our data includedExpand
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Phylogeny and Biogeography of Pomaria (Caesalpinioideae: Leguminosae)
Abstract Pomaria, traditionally placed in Hoffmannseggia or Caesalpinia, is shown to be a well-supported group of 15 species related to the Erythrostemon group of Caesalpinia sensu lato. Monophyly isExpand
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Pollen performance of Raphanus sativus (Brassicaceae) declines in response to elevated [CO2]
Although increases in atmospheric [CO2] are known to affect plant physiology, growth and reproduction, understanding of these effects is limited because most studies of reproductive consequencesExpand
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Four New Fall Species of Andrena from the Southwestern United States (Hymenoptera: Andrenidae)
Abstract Four new fall-emergent species of Andrena from the southwestern United States are described. Andrena brooksi n. sp., from southeastern Arizona and southwestern New Mexico, is a closeExpand
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A New Species of Andrena (Hymenoptera: Andrenidae) from Mexico
Abstract A new species of andrenid bee (Hymenoptera: Andrenidae), Andrena (Callandrena) jazleya Pohl and Larkin, n. sp., is described from southwestern Mexico. The species is closely related to A.Expand