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Type: Journal article
Title: Photic niche invasions: phylogenetic history of the dim-light foraging augochlorine bees (Halictidae)
Author: Tierney, S.
Sanjur, O.
Grajales, G.
Santos, L.
Bermingham, E.
Wcislo, W.
Citation: Proceedings of the Royal Society B: Biological Sciences, 2012; 279(1729):794-803
Publisher: The Royal Society Publishing
Issue Date: 2012
ISSN: 0962-8452
Statement of
Simon M. Tierney, Oris Sanjur, Grethel G. Grajales, Leandro M. Santos, Eldredge Bermingham, William T. Wcislo
Abstract: Most bees rely on flowering plants and hence are diurnal foragers. From this ancestral state, dim-light foraging in bees requires significant adaptations to a new photic environment. We used DNA sequences to evaluate the phylogenetic history of the most diverse clade of Apoidea that is adapted to dim-light environments (Augochlorini: Megalopta, Megaloptidia and Megommation). The most speciose lineage, Megalopta, is distal to the remaining dim-light genera, and its closest diurnal relative (Xenochlora) is recovered as a lineage that has secondarily reverted to diurnal foraging. Tests for adaptive protein evolution indicate that long-wavelength opsin shows strong evidence of stabilizing selection, with no more than five codons (2%) under positive selection, depending on analytical procedure. In the branch leading to Megalopta, the amino acid of the single positively selected codon is conserved among ancestral Halictidae examined, and is homologous to codons known to influence molecular structure at the chromophore-binding pocket. Theoretically, such mutations can shift photopigment λ(max) sensitivity and enable visual transduction in alternate photic environments. Results are discussed in light of the available evidence on photopigment structure, morphological specialization and biogeographic distributions over geological time.
Keywords: opsin; dim-light; Augochlorini; adaptive radiation; relictual taxa
Rights: © 2011 The Royal Society
RMID: 0030013309
DOI: 10.1098/rspb.2011.1355
Appears in Collections:Ecology, Evolution and Landscape Science publications

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