Robert J Gegear

Summary

Affiliation: University of Massachusetts Medical School
Country: USA

Publications

  1. ncbi request reprint The birds, the bees, and the virtual flowers: can pollinator behavior drive ecological speciation in flowering plants?
    Robert J Gegear
    Department of Ecology and Evolutionary Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario M5S 3G5, Canada
    Am Nat 170:551-66. 2007
  2. pmc Animal cryptochromes mediate magnetoreception by an unconventional photochemical mechanism
    Robert J Gegear
    Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, USA
    Nature 463:804-7. 2010
  3. pmc Navigational mechanisms of migrating monarch butterflies
    Steven M Reppert
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, MA 01605, USA
    Trends Neurosci 33:399-406. 2010
  4. pmc Antennal circadian clocks coordinate sun compass orientation in migratory monarch butterflies
    Christine Merlin
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, MA 01605, USA
    Science 325:1700-4. 2009
  5. pmc Cryptochrome mediates light-dependent magnetosensitivity in Drosophila
    Robert J Gegear
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA
    Nature 454:1014-8. 2008
  6. pmc Defining behavioral and molecular differences between summer and migratory monarch butterflies
    Haisun Zhu
    Department of Neurobiology, University of Massachusetts Medical School, Plantation Street, Worcester, MA 01605, USA
    BMC Biol 7:14. 2009
  7. pmc Human cryptochrome exhibits light-dependent magnetosensitivity
    Lauren E Foley
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA
    Nat Commun 2:356. 2011
  8. ncbi request reprint Ecological context influences pollinator deterrence by alkaloids in floral nectar
    Robert J Gegear
    Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
    Ecol Lett 10:375-82. 2007
  9. pmc Discordant timing between antennae disrupts sun compass orientation in migratory monarch butterflies
    Patrick A Guerra
    Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, USA
    Nat Commun 3:958. 2012
  10. pmc Bumble-bee foragers infected by a gut parasite have an impaired ability to utilize floral information
    Robert J Gegear
    Department of Zoology, University of Toronto, Toronto, Ontario M5S 3G5, Canada
    Proc Biol Sci 273:1073-8. 2006

Detail Information

Publications14

  1. ncbi request reprint The birds, the bees, and the virtual flowers: can pollinator behavior drive ecological speciation in flowering plants?
    Robert J Gegear
    Department of Ecology and Evolutionary Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario M5S 3G5, Canada
    Am Nat 170:551-66. 2007
    ..Pollinators can thus drive ecological speciation in flowering plants, but more rigorous and comprehensive behavioral studies are required to specify conditions that produce sufficient preference levels in pollinators...
  2. pmc Animal cryptochromes mediate magnetoreception by an unconventional photochemical mechanism
    Robert J Gegear
    Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, USA
    Nature 463:804-7. 2010
    ..This work emphasizes the utility of Drosophila transgenesis for elucidating the precise mechanisms of Cry-mediated magnetosensitivity in insects and also in vertebrates such as migrating birds...
  3. pmc Navigational mechanisms of migrating monarch butterflies
    Steven M Reppert
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, MA 01605, USA
    Trends Neurosci 33:399-406. 2010
    ..Monarch butterflies are thus emerging as an excellent model organism in which to study the molecular and neural basis of long-distance migration...
  4. pmc Antennal circadian clocks coordinate sun compass orientation in migratory monarch butterflies
    Christine Merlin
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, MA 01605, USA
    Science 325:1700-4. 2009
    ..These unexpected findings pose a novel function for the antennae and open a new line of investigation into clock-compass connections that may extend widely to other insects that use this orientation mechanism...
  5. pmc Cryptochrome mediates light-dependent magnetosensitivity in Drosophila
    Robert J Gegear
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA
    Nature 454:1014-8. 2008
    ..Moreover, Cry-dependent magnetosensitivity does not require a functioning circadian clock. Our work provides, to our knowledge, the first genetic evidence for a Cry-based magnetosensitive system in any animal...
  6. pmc Defining behavioral and molecular differences between summer and migratory monarch butterflies
    Haisun Zhu
    Department of Neurobiology, University of Massachusetts Medical School, Plantation Street, Worcester, MA 01605, USA
    BMC Biol 7:14. 2009
    ....
  7. pmc Human cryptochrome exhibits light-dependent magnetosensitivity
    Lauren E Foley
    Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA
    Nat Commun 2:356. 2011
    ..The results show that human CRY2 has the molecular capability to function as a light-sensitive magnetosensor and reopen an area of sensory biology that is ready for further exploration in humans...
  8. ncbi request reprint Ecological context influences pollinator deterrence by alkaloids in floral nectar
    Robert J Gegear
    Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
    Ecol Lett 10:375-82. 2007
    ..We consider adaptive strategies that would enable plants to minimize pollinator deterrence because of defensive compounds in flowers...
  9. pmc Discordant timing between antennae disrupts sun compass orientation in migratory monarch butterflies
    Patrick A Guerra
    Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, USA
    Nat Commun 3:958. 2012
    ..This dual timing system is a novel example of the regulation of a brain-driven behaviour by paired organs...
  10. pmc Bumble-bee foragers infected by a gut parasite have an impaired ability to utilize floral information
    Robert J Gegear
    Department of Zoology, University of Toronto, Toronto, Ontario M5S 3G5, Canada
    Proc Biol Sci 273:1073-8. 2006
    ..Parasitized animals, including invertebrates, can therefore show subtle behavioural changes that are nonetheless ecologically significant and reflect complex mechanisms...
  11. pmc Habitat assessment ability of bumble-bees implies frequency-dependent selection on floral rewards and display size
    Jay M Biernaskie
    Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada
    Proc Biol Sci 274:2595-601. 2007
    ..One implication is that geitonogamy may be a less significant constraint on the evolution of rewarding traits than generally supposed...
  12. ncbi request reprint Bumblebees learn to forage like Bayesians
    Jay M Biernaskie
    Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada
    Am Nat 174:413-23. 2009
    ..More generally, it highlights the remarkable adaptive plasticity of an important generalist pollinator and agent of selection...
  13. pmc A magnetic compass aids monarch butterfly migration
    Patrick A Guerra
    Department of Neurobiology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, USA
    Nat Commun 5:4164. 2014
    ....
  14. ncbi request reprint Multicomponent floral signals elicit selective foraging in bumblebees
    Robert J Gegear
    Department of Zoology, University of Toronto, Canada, M5S 3G5
    Naturwissenschaften 92:269-71. 2005
    ..I discuss these findings in the context of pollinator behavioural mechanisms and the evolution of floral diversity...