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Serotonin Mediates Behavioral Gregarization Underlying Swarm Formation in Desert Locusts
TLDR
It is shown that serotonin, an evolutionarily conserved mediator of neuronal plasticity, is responsible for this behavioral transformation, being both necessary if behavioral gregarization is to occur and sufficient to induce it.
Plasticity in the visual system is correlated with a change in lifestyle of solitarious and gregarious locusts.
TLDR
This work analyzed in both phases the responses of an identified visual interneuron, the descending contralateral movement detector (DCMD), which responds to approaching objects, and demonstrated that habituation of DCMD is fivefold stronger in solitarious locusts.
Substantial changes in central nervous system neurotransmitters and neuromodulators accompany phase change in the locust
TLDR
High-performance liquid chromatography data show that changes in levels of neuroactive substances are widespread in the central nervous system and reflect the time course of behavioural and physiological phase change in desert locusts.
Gregarious desert locusts have substantially larger brains with altered proportions compared with the solitarious phase
  • S. Ott, S. Rogers
  • Biology
    Proceedings of the Royal Society B: Biological…
  • 22 October 2010
TLDR
The first comprehensive major axis regression analysis of scaling relations in an insect brain revealed that phase differences in brain proportions arise from a combination of allometric effects and deviations from the allometric expectation (grade shifts).
Mechanosensory-induced behavioural gregarization in the desert locust Schistocerca gregaria
TLDR
The data show for the first time that the gregarizing signal combines both exteroceptive and proprioceptive components, which travel in both nerves 5B1 and 5B2, and provides a powerful experimental method with which to elicit and study neuronal plasticity in this system.
Spatiotemporal receptive field properties of a looming-sensitive neuron in solitarious and gregarious phases of the desert locust.
TLDR
The lobula giant movement detector and its postsynaptic target, the descending contralateral movement detector, which are visual interneurons that detect looming objects are used to analyze how differences in the visual ecology of the two phases are served by altered neuronal function.
Parallel somatotopic maps of gustatory and mechanosensory neurons in the central nervous system of an insect
TLDR
It is shown that the sensory neurons from tactile hairs form a complete 3‐dimensional somatotopic map in the mesothoracic ganglion, and the position of a receptor on the leg is preserved in the central nervous system not only for the mechanosensory neurons from both tactile hairs and basiconic sensilla but also for chemosENSory neurons.
Critical role for protein kinase A in the acquisition of gregarious behavior in the desert locust
TLDR
Results show that PKA has been coopted into effecting the wide-ranging transformation from solitarious to gregarious behavior, with PKA-mediated behavioral plasticity resulting in an environmentally driven reorganization of a complex phenotype.
Compensatory Plasticity at an Identified Synapse Tunes a Visuomotor Pathway
TLDR
Homeostatic modulation of the amplitude, together with a nonlinear synaptic transformation of timing, acted together to tune the DCMD-FETi system so that swarming gregarious locusts respond earlier to small moving objects, such as conspecifics, than solitarious locUSTs.
Microarray-Based Transcriptomic Analysis of Differences between Long-Term Gregarious and Solitarious Desert Locusts
TLDR
The authors' microarray analysis has identified genes whose altered expression may enable locusts of either phase to deal with the different challenges they face, and appears to be more strongly protected from the slowly accumulating effects of ageing by an upregulation of genes related to anti-oxidant systems, detoxification and anabolic renewal.
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