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Robert J. Gegear
Worcester Polytechnic Institute
34Publications
22H-index
1,862Citations
Publications 34
Newest
#1Melissa W. Mobley (WPI: Worcester Polytechnic Institute)
#2Robert J. Gegear (WPI: Worcester Polytechnic Institute)H-Index: 22
Bumblebees are declining at alarming rate worldwide, posing a significant threat to the function and diversity of temperate ecosystems. These declines have been attributed, in part, to the direct effect of specific pathogens on bumblebee survival. However, pathogens may also have a negative impact on host populations indirectly through immune-induced cognitive deficits in infected individuals. To gain greater insight into mechanisms and potential conservation implications of such ‘immune-brain c...
#1Melissa W. Mobley (WPI: Worcester Polytechnic Institute)
#2Robert J. Gegear (WPI: Worcester Polytechnic Institute)H-Index: 22
Neonicotinoid insecticides have been implicated in the rapid global decline of bumblebees over recent years, particularly in agricultural and urban areas. While there is much known about neonicotinoid toxicity effects at the colony stage of the bumblebee annual cycle, far less is known about such effects at other stages critical for the maintenance of wild populations. In the present work, individual-based feeding assays were used to show that chronic consumption of the widely used neonicotinoid...
AbstractMost pollinators have the foraging flexibility to visit a wide variety of plant species. Yet few studies of pollinator-mediated processes in plants have considered the effects of variation in individual foraging patterns on plant reproductive success. In this study, we use an individual-based model of pollinator foraging economics to predict how visitation rates and pollination success of two coflowering plant species change with their frequency (relative abundance). Whereas previous stu...
Aug 1, 2018 in VTC (Vehicular Technology Conference)
#1Kuldeep S. Gill (WPI: Worcester Polytechnic Institute)H-Index: 1
#2Kyle W. McClintick (WPI: Worcester Polytechnic Institute)
Last.Alexander M. Wyglinski (WPI: Worcester Polytechnic Institute)H-Index: 28
view all 19 authors...
In this paper, we design a test-bed for a bumblebee inspired channel selection algorithm employed on a wireless ad-hoc network. Vehicles in connected ad-hoc networks are routinely challenged with the complex decision-making problem of either staying with the same channel or moving to a different channel under highly time-varying channel quality conditions. In order to enable vehicles to adapt to these time-varying channel conditions, we designed a bumblebee-inspired decision-making algorithm. Th...
Jun 1, 2018 in VTC (Vehicular Technology Conference)
#1Kuldeep S. Gill (WPI: Worcester Polytechnic Institute)H-Index: 1
#2Kevin N. Heath (WPI: Worcester Polytechnic Institute)H-Index: 1
Last.Alexander M. Wyglinski (WPI: Worcester Polytechnic Institute)H-Index: 28
view all 5 authors...
The bumblebee has recently been proposed as a model to optimize channel allocation in connected vehicle networks where the quality of each channel varies unpredictably over time and space. A fundamental mathematical challenge that must be overcome before implementing the bumblebee model is determining the theoretical upper bound of spectrum optimization that can be achieved under such stochastic channel conditions. In this paper, we leverage the concept of queuing theory in order to conduct the ...
#1Kuldeep S. Gill (WPI: Worcester Polytechnic Institute)H-Index: 1
#2Bengi Aygun (WPI: Worcester Polytechnic Institute)H-Index: 4
Last.Alexander M. Wyglinski (WPI: Worcester Polytechnic Institute)H-Index: 28
view all 6 authors...
Vehicles forming connected communication networks are routinely challenged with the complex decision problem of either staying with the same wireless channel or moving to a different wireless channel when experiencing highly variable channel quality conditions. In order to obtain a practical solution to this problem, we refer to bumblebee behavioral models, which possess evolved decision-making mechanisms to adaptively solve similar problems while foraging in environments containing multiple flo...
#1Robert J. Gegear (WPI: Worcester Polytechnic Institute)H-Index: 22
#2Rebecca Burns (WPI: Worcester Polytechnic Institute)H-Index: 1
Last.Katharine A. Swoboda-Bhattarai (WPI: Worcester Polytechnic Institute)H-Index: 1
view all 3 authors...
Pollination syndromes are suites of floral traits presumed to reflect adaptations to attract and utilize a ‘primary’ type of animal pollinator. However, syndrome traits may also function to deter ‘secondary’ flower visitors that reduce plant fitness through their foraging activities. Here we use the hummingbird-pollinated plant species Mimulus cardinalis as a model to investigate the potential deterrent effects of classic bird syndrome traits on bumblebee foragers. To establish that M. cardinali...
#1Patrick A. Guerra (UMMS: University of Massachusetts Medical School)H-Index: 10
#2Robert J. Gegear (WPI: Worcester Polytechnic Institute)H-Index: 22
Last.Steven M. Reppert (UMMS: University of Massachusetts Medical School)H-Index: 89
view all 3 authors...
Monarch butterflies (Danaus plexippus) migrate from North America to central Mexico during the fall. Here, Guerra et al. show that, in addition to a sun compass orientation, monarch butterflies use a magnetic compass to help direct their flight towards the equator.
#1Patrick A. Guerra (UMMS: University of Massachusetts Medical School)H-Index: 10
#2Christine Merlin (UMMS: University of Massachusetts Medical School)H-Index: 19
Last.Steven M. Reppert (UMMS: University of Massachusetts Medical School)H-Index: 89
view all 4 authors...
Monarch Butterflies (Danaus plexippus) use their antennae for orientation during their autumnal migration. Guerra and colleagues differentially disrupt clock gene expression in each antenna and find that the individual outputs are integrated and processed to allow precise control of orientation behaviour.
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