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Author |
Flores, D.E.F.L.; Oda, G.A. |
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Title |
Novel Light/Dark Regimens with Minimum Light Promote Circadian Disruption: Simulations with a Model Oscillator |
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Journal Article |
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Year |
2018 |
Publication |
Journal of Biological Rhythms |
Abbreviated Journal |
J Biol Rhythms |
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Volume |
in press |
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Animals |
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Abstract |
Artificial lab manipulation of LD cycles has enabled simulations of the disruptive conditions found in modern human societies, such as jet-lag, night-work and light at night. New techniques using animal models have been developed, and these can greatly improve our understanding of circadian disruption. Some of these techniques, such as in vivo bioluminescence assays, require minimum external light. This requirement is challenging because the usual lighting protocols applied in circadian desynchronization experiments rely on considerable light input. Here, we present a novel LD regimen that can disrupt circadian rhythms with little light per day, based on computer simulations of a model limit-cycle oscillator. The model predicts that a single light pulse per day has the potential to disturb rhythmicity when pulse times are randomly distributed within an interval. Counterintuitively, the rhythm still preserves an underlying 24-h periodicity when this interval is as large as 14 h, indicating that day/night cues are still detectable. Only when pulses are spread throughout the whole 24-h day does the rhythm lose any day-to-day period correlation. In addition, the model also reveals that stronger pulses of brighter light should exacerbate the disrupting effects. We propose the use of this LD schedule-which would be compatible with the requirements of in vivo bioluminescence assays-to help understand circadian disruption and associated illnesses. |
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Instituto de Biociencias, Universidade de Sao Paulo, Sao Paulo, SP, Brazil |
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0748-7304 |
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PMID:30595077 |
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Call Number |
GFZ @ kyba @ |
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2146 |
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Author |
Smith, H.M.; Neaves, L.E.; Divljan, A. |
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Title |
Predation on cicadas by an Australian Flying-fox Pteropus poliocephalus based on DNA evidence |
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Journal Article |
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Year |
2018 |
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Australian Zoologist |
Abbreviated Journal |
Australian Zoologist |
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in press |
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Keywords |
Animals |
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Abstract |
Historically, reports of insectivory in family Pteropodidae have largely been anecdotal and thought to be an incidental corollary of flying-foxes feeding on plant products. More recent direct observations of flying-foxes catching and consuming insects, as well as advances in techniques that increase our ability to detect dietary items, suggest that this behaviour may be deliberate and more common than previously thought. Usually, multiple insects are consumed, but it appears that flying-foxes hunt and eat them one at a time. However, we have collected and photographed oral ejecta pellets under trees with high flying-fox activity, some containing evidence of multiple masticated insects. Further genetic analysis proved that these pellets came from Grey-headed Flying-foxes Pteropus poliocephalus. We propose that flying-foxes use an array of insect feeding strategies, most likely in response to variation in insect abundance and activity, as well as abiotic factors such as light and temperature. |
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0067-2238 |
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GFZ @ kyba @ |
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2148 |
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Author |
Hines, C.W.; Fang, Y.; Chan, V.K.S.; Stiller, K.T.; Brauner, C.J.; Richards, J.G. |
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Title |
The effect of salinity and photoperiod on thermal tolerance of Atlantic and coho salmon reared from smolt to adult in recirculating aquaculture systems |
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Journal Article |
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Year |
2018 |
Publication |
Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology |
Abbreviated Journal |
Comp Biochem Physiol A Mol Integr Physiol |
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230 |
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1-6 |
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Animals |
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Land-based, closed containment salmon aquaculture involves rearing salmon from smolt to adult in recirculating aquaculture systems (RAS). Unlike in open-net pen aquaculture, rearing conditions can be specified in RAS in order to optimize growth and physiological stress tolerance. The environmental conditions that yield optimal stress tolerance in salmon are, however, unknown. To address this knowledge gap, we reared Atlantic (Salmo salar) and coho (Oncorhynchus kisutch) salmon in 7 separate RASs for 400days post-smoltification under 2 photoperiods (24:0 or 12:12, light:dark) and 4 salinities (2.5, 5, 10 or 30ppt.) and assessed the effects of these conditions on thermal tolerance. We found that over the first 120days post-smoltification, rearing coho under a 24:0 photoperiod resulted in a ~2 degrees C lower critical thermal maxima (CTmax) than in coho reared under a 12:12 photoperiod. This photoperiod effect did not persist at 200 and 400days, which was coincident with an overall decrease in CTmax in coho. Finally, Atlantic salmon had a higher CTmax (~28 degrees C) compared to coho (~26 degrees C) at 400days post-smoltification. Overall, these findings are important for the future implications of RAS and for the aquaculture industry to help identify physiologically sensitive time stages. |
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Department of Zoology, The University of British Columbia, 6270 University Blvd., Vancouver, BC V6T 1Z4, Canada |
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English |
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1095-6433 |
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Notes |
PMID:30590111 |
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Call Number |
GFZ @ kyba @ |
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2149 |
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Author |
Stafstrom, J.A.; Hebets, E.A. |
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Title |
Male attraction to female airborne cues by the net-casting spider, Deinopis spinosa |
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Journal Article |
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Year |
2018 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav Processes |
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Volume |
159 |
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23-30 |
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Animals |
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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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Notes |
PMID:30562562 |
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Call Number |
GFZ @ kyba @ |
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2152 |
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Author |
Wakefield, A.; Broyles, M.; Stone, E.L.; Harris, S.; Jones, G.; Minderman, J. |
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Title |
Quantifying the attractiveness of broad-spectrum street lights to aerial nocturnal insects |
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Journal Article |
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Year |
2018 |
Publication |
Journal of Applied Ecology |
Abbreviated Journal |
J Appl Ecol |
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Volume |
55 |
Issue |
2 |
Pages |
714-722 |
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Keywords |
Animals |
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Abstract |
Sodium street lights, dominated by long wavelengths of light, are being replaced by broad‐spectrum, white lights globally, in particular light‐emitting diodes (LEDs). These white lights typically require less energy to operate and are therefore considered “eco‐friendly”. However, little attention has been paid to the impacts white lights may have upon local wildlife populations.
We compared insect attraction to orange (high‐pressure sodium, HPS) and white (metal halide, MH and LED) street lights experimentally using portable street lights and custom‐made flight intercept traps.
Significantly more (greater than five times as many) insects were attracted to white MH street lights than white (4,250 K) LED and HPS lights. There was no statistical difference in the numbers of insects attracted to LED and HPS lights for most taxa caught. However, rarefaction shows a greater diversity of insects caught at LED than HPS lights.
Policy implications. With the current, large‐scale conversion to white light‐emitting diode (LED) lighting, our results give insight into how changes to street light technology may affect wildlife populations and communities. We recommend avoiding metal halide light installations as they attract many more insects than competing technologies. We highlight the need to tailor LED lighting to prevent disturbances across multiple insect taxa. |
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0021-8901 |
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GFZ @ kyba @ |
Serial |
2224 |
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