| Records |
| Author |
Lopes, A.C.C.; Villacorta-Correa, M.A.; Carvalho, T.B. |
| Title |
Lower light intensity reduces larval aggression in matrinxã, Brycon amazonicus |
Type |
Journal Article |
| Year |
2018 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behavioural Processes |
| Volume |
151 |
Issue |
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Pages |
62-66 |
| Keywords |
Animals |
| Abstract |
Brycon amazonicus shows a high frequency of aggressive behavior, which can be a limiting factor in intensive farming systems. Environmental changes can modulate the social interactions of fish and reduce aggression during the different stages of production. Groups of three larvae at 12 h after hatching (HAH) were subjected to different levels of light intensity: low (17 ± 3 lx), intermediate (204 ± 12.17 lx) and high (1,613.33 ± 499.03 lx), with eight replicates for each level. The lower light intensity reduced the frequency of aggressive interactions and locomotor activity exhibited by the animals. Based on these results, light intensity modulates aggression in B. amazonicus larvae. Manipulation of this factor could improve the social conditions of this species during farming and contribute to the development of new production technologies. |
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0376-6357 |
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LoNNe @ kyba @ |
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1810 |
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| Author |
Stafstrom, J.A.; Hebets, E.A. |
| Title |
Male attraction to female airborne cues by the net-casting spider, Deinopis spinosa |
Type |
Journal Article |
| Year |
2018 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav Processes |
| Volume |
159 |
Issue |
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Pages |
23-30 |
| Keywords |
Animals |
| Abstract |
For many animals, finding a mate can be a difficult task. For males, it often involves actively searching for conspecific females, sometimes over great distances. This mate-searching can be aided through chemical or visual signals or cues produced by sexually receptive females. Here, we investigate the roles of olfaction and vision in mate-searching in a strictly nocturnal net-casting spider, Deinopis spinosa. First, we used an olfactometer assay to determine if mature male D. spinosa respond to conspecific airborne cues. We found that mature males, but not mature females, were attracted to airborne cues of mature female conspecifics. We next investigated the relative importance of olfaction and vision in male mate-searching. While manipulating airflow and light levels in screened enclosures in the laboratory, we tested freely moving mature males for mate-searching success. We found no effect of our airflow treatment on mate-searching success. Light levels, however, affected mate-searching in an unexpected way – males were more likely to locate females in complete darkness when compared to dim-light conditions. Our results suggest that visual cues are not necessary for successful male mate-searching in D. spinosa, but that the visual environment can nonetheless influence male behavior. In summary, we provide evidence suggesting that airborne cues, but not visual cues, are important in D. spinosa male mate-searching efforts, though the source of these chemical airborne cues remains unknown. |
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University of Nebraska – Lincoln, School of Biological Sciences, NE, USA |
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English |
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0376-6357 |
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PMID:30562562 |
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no |
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GFZ @ kyba @ |
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2152 |
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Wang, L.; Liu, X.; Liu, Z.; Wang, X.; Lei, C.; Zhu, F. |
| Title |
Members of the neuropeptide transcriptional network in Helicoverpa armigera and their expression in response to light stress |
Type |
Journal Article |
| Year |
2018 |
Publication |
Gene |
Abbreviated Journal |
Gene |
| Volume |
671 |
Issue |
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Pages |
67-77 |
| Keywords |
Animals |
| Abstract |
Neuropeptides and peptide hormones play central roles in the regulation of various types of insect physiology and behavior. Artificial light at night, a form of environmental stress, has recently been regarded as a source of light stress on nocturnal insects. Because related genomic information is not available, molecular biological studies on the response of neuropeptides in nocturnal insects to light stress are limited. Based on the de novo sequencing of the Helicoverpa armigera head transcriptome, we obtained 124,960 unigenes. Of these, the number of unigenes annotated as neuropeptides and peptide hormones, neurotransmitter precursor processing enzymes, and neurotransmitter receptors were 34, 17, and 58, respectively. Under light stress, there were sex-specific differences in gene expression measured by qRT-PCR. The IMFamide, leucokinin and sNPF genes were differentially expressed at the mRNA level in males but not in females in response to light stress. The results provide new insights on the diversity of the neuropeptide transcriptional network of H. armigera. In addition, some neuropeptides exhibited sex-specific differential expression in response to light stress. Taken collectively, these results not only expand the catalog of known insect neuropeptides but also provide a framework for future functional studies on the physiological roles they play in the light stress response behavior of nocturnal moths. |
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0378-1119 |
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no |
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GFZ @ kyba @ |
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1910 |
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Almaida-Pagan, P.F.; Ortega-Sabater, C.; Lucas-Sanchez, A.; Martinez-Nicolas, A.; Espinosa, C.; Esteban, M.A.; Madrid, J.A.; Rol, M.; Mendiola, P.; de Costa, J. |
| Title |
Impact of a shift work-like lighting schedule on the functioning of the circadian system in the short-lived fish Nothobranchius furzeri |
Type |
Journal Article |
| Year |
2018 |
Publication |
Experimental Gerontology |
Abbreviated Journal |
Exp Gerontol |
| Volume |
in press |
Issue |
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Pages |
in press |
| Keywords |
Animals |
| Abstract |
Adult Nothobranchius furzeri of the MZM-04/10 strain were individually kept and subjected to a “5+2” shifting lighting schedule (SHIFT) for 8weeks in order to evaluate the desynchronizing effects of a simulated human-like shift-work schedule on the functioning of the circadian system (CS). With this aim, sixteen 21-week-old N. furzeri were placed into a Morning, Night and Evening schedule (lights on from 08:00 to 16:00, 00:00 to 08:00 and 16:00 to 00:00h, respectively) and fed once a day in the middle of the corresponding photophase (12:00, 04:00 and 20:00h, respectively). Then, in the weekends (2days), fish were always returned to the Morning shift. As controls, 16 fish were maintained under a non-shifting LD cycle condition (CONTROL) throughout the whole experiment, with lights on from 08:00 to 16:00h. Rest-activity rhythm (RAR) of fish subjected to SHIFT showed several symptoms of chronodisruption, such as a decrease in the percentage of diurnal activity and a reduction of the relative amplitude and the circadian function index with time. When a periodogram analysis was performed, RAR of N. furzeri under SHIFT conditions showed up to three separate circadian components: one longer than 24h (26.5h) that followed the weekly 8h delays; a short-period component (~23h) that was related to the weekend's phase advances, and finally, a 24h component. The shifting LD schedule also affected fish CS at a molecular level, with several significant differences in the expression of core genes of the molecular clock (bmal1, clock, roralpha, rev-erbalpha) between SHIFT and CONTROL animals. RAR impairment along with changes in clock gene expression could be associated with high stress and accelerated aging in these fish. |
| Address |
Chronobiology Lab, Department of Physiology, College of Biology, University of Murcia, Mare Nostrum Campus, IUIE, IMIB-Arrixaca, Spain; Ciber Fragilidad y Envejecimiento Saludable (CIBERFES), Madrid, Spain |
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English |
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0531-5565 |
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| Notes |
PMID:30184464 |
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no |
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GFZ @ kyba @ |
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1999 |
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| Author |
Emmer, K.M.; Russart, K.L.G.; Walker, W.H.; Nelson, R.J.; DeVries, A.C. |
| Title |
Effects of light at night on laboratory animals and research outcomes |
Type |
Journal Article |
| Year |
2018 |
Publication |
Behavioral Neuroscience |
Abbreviated Journal |
Behav Neurosci |
| Volume |
132 |
Issue |
4 |
Pages |
302-314 |
| Keywords |
Animals |
| Abstract |
Light has substantial influences on the physiology and behavior of most laboratory animals. As such, lighting conditions within animal rooms are potentially significant and often underappreciated variables within experiments. Disruption of the light/dark cycle, primarily by exposing animals to light at night (LAN), disturbs biological rhythms and has widespread physiological consequences because of mechanisms such as melatonin suppression, sympathetic stimulation, and altered circadian clock gene expression. Thus, attention to the lighting environment of laboratory animals and maintaining consistency of a light/dark cycle is imperative for study reproducibility. Light intensity, as well as wavelength, photoperiod, and timing, are all important variables. Although modern rodent facilities are designed to facilitate appropriate light cycling, there are simple ways to modify rooms to prevent extraneous light exposure during the dark period. Attention to lighting conditions of laboratory animals by both researchers and research care staff ensures best practices for maintaining animal welfare, as well as reproducibility of research results. (PsycINFO Database Record |
| Address |
Rockefeller Neuroscience Institute, West Virginia University |
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English |
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0735-7044 |
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PMID:29952608 |
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no |
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GFZ @ kyba @ |
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1957 |
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