start-ver=1.4
cd-journal=joma
no-vol=130
cd-vols=
no-issue=1
article-no=
start-page=34
end-page=40
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200507
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Genetic variation and phenotypic plasticity in circadian rhythms in an armed beetle, Gnatocerus cornutus (Tenebrionidae)
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Circadian rhythms, their free-running periods and the power of the rhythms are often used as indicators of biological clocks, and there is evidence that the free-running periods of circadian rhythms are not affected by environmental factors, such as temperature. However, there are few studies of environmental effects on the power of the rhythms, and it is not clear whether temperature compensation is universal. Additionally, genetic variation and phenotypic plasticity in biological clocks are important for understanding the evolution of biological rhythms, but genetic and plastic effects are rarely investigated. Here, we used 18 isofemale lines (genotypes) of Gnatocerus cornutus to assess rhythms of locomotor activity, while also testing for temperature effects. We found that total activity and the power of the circadian rhythm were affected by interactions between sex and genotype or between sex, genotype and temperature. The males tended to be more active and showed greater increases in activity, but this effect varied across both genotypes and temperatures. The period of activity varied only by genotype and was thus independent of temperature. The complicated genotype?sex?environment interactions we recorded stress the importance of investigating circadian activity in more integrated ways.
en-copyright=
kn-copyright=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=AbeMasato S
en-aut-sei=Abe
en-aut-mei=Masato S
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=SharmaManmohan D
en-aut-sei=Sharma
en-aut-mei=Manmohan D
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=HoskenDavid J
en-aut-sei=Hosken
en-aut-mei=David J
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=YoshiiTaishi
en-aut-sei=Yoshii
en-aut-mei=Taishi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Center for Advanced Intelligence Project, RIKEN
kn-affil=
affil-num=3
en-affil=Centre for Ecology and Conservation, School of Biosciences, University of Exeter
kn-affil=
affil-num=4
en-affil=Centre for Ecology and Conservation, School of Biosciences, University of Exeter
kn-affil=
affil-num=5
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
affil-num=6
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=circadian rhythm
kn-keyword=circadian rhythm
en-keyword=Gnatocerus cornutus
kn-keyword=Gnatocerus cornutus
en-keyword=isofemale line
kn-keyword=isofemale line
en-keyword=power of circadian rhythm
kn-keyword=power of circadian rhythm
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200519
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Death feigning as an adaptive anti‐predator behaviour: Further evidence for its evolution from artificial selection and natural populations
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Death feigning is considered to be an adaptive antipredator behaviour. Previous studies on Tribolium castaneum have shown that prey which death feign have a fitness advantage over those that do not when using a jumping spider as the predator. Whether these effects are repeatable across species or whether they can be seen in nature is, however, unknown. Therefore, the present study involved two experiments: (a) divergent artificial selection for the duration of death feigning using a related species T. freemani as prey and a predatory bug as predator, demonstrating that previous results are repeatable across both prey and predator species, and (b) comparison of the death‐feigning duration of T. castaneum populations collected from field sites with and without predatory bugs. In the first experiment, T. freemani adults from established selection regimes with longer durations of death feigning had higher survival rates and longer latency to being preyed on when they were placed with predatory bugs than the adults from regimes selected for shorter durations of death feigning. As a result, the adaptive significance of death‐feigning behaviour was demonstrated in another prey?predator system. In the second experiment, wild T. castaneum beetles from populations with predators feigned death longer than wild beetles from predator‐free populations. Combining the results from these two experiments with those from previous studies provided strong evidence that predators drive the evolution of longer death feigning.
en-copyright=
kn-copyright=
en-aut-name=KonishiKana
en-aut-sei=Konishi
en-aut-mei=Kana
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=SakunoWataru
en-aut-sei=Sakuno
en-aut-mei=Wataru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=4
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
en-keyword= Amphibolus venator
kn-keyword= Amphibolus venator
en-keyword= antipredator behaviour
kn-keyword= antipredator behaviour
en-keyword= artificial selection
kn-keyword= artificial selection
en-keyword= locomotor activity
kn-keyword= locomotor activity
en-keyword= thanatosis
kn-keyword= thanatosis
en-keyword= tonic immobility
kn-keyword= tonic immobility
en-keyword= Tribolium freemani
kn-keyword= Tribolium freemani
END
start-ver=1.4
cd-journal=joma
no-vol=38
cd-vols=
no-issue=
article-no=
start-page=233
end-page=239
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200314
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Relationships between mating tactics and male traits such as body size and fluctuating asymmetry in the Japanese scorpionfly
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Fluctuating asymmetry (FA) is defined as small, random deviations from perfect bilateral symmetry in a morphological trait. It has sometimes been used as an indicator of male quality because it affects male mating success. In the Japanese scorpionfly, Panorpa japonica, males are known to use two mating tactics, donation of nuptial gifts and forced mating. In P. japonica, low FA males are more likely to win a competition with another male, and females prefer low FA male sex pheromones. However, no studies have been conducted on the effect of FA on the mating tactics adopted by males. In the present study, we first observed the mating behaviors of P. japonica and classified these into three patterns: (1) nuptial gifting, (2) forced mating, and (3) feeding mating. Second, we investigated the relationships between mating tactics and male traits, including body size, FA, and weapon size. The results showed a positive correlation between absolute FA and mating duration only in the case of feeding mating. We discuss the reasons why this significant correlation was found in P. japonica.
en-copyright=
kn-copyright=
en-aut-name=IshiharaRyo
en-aut-sei=Ishihara
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil=raduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
en-keyword=Copulation
kn-keyword=Copulation
en-keyword=Courtship
kn-keyword=Courtship
en-keyword=Mating duration
kn-keyword=Mating duration
en-keyword=Panorpa japonica
kn-keyword=Panorpa japonica
END
start-ver=1.4
cd-journal=joma
no-vol=38
cd-vols=
no-issue=1
article-no=
start-page=14
end-page=22
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Individual and Sexual Differences in Time to Habituate to Food-stimuli Presentation of Potential Prey in Hyla japonica
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= The traits of many animal species exhibit individual and sexual differences. Individuals repeatedly receiving a stimulus without harm become habituated to it. However, few studies have been conducted on individual and sexual differences in the process of habituation to unfamiliar food stimuli. Therefore, we hypothesized that individual differences or sexual differences would be observed in reaction to an in-lab food-stimuli presentation of potential prey items (after that "food stimuli"). We tested the hypothesis using the Japanese tree frog Hyla japonica, and conducted statistical analyses of these results. A generalized linear model (GLM) showed individual and sexual differences in time to get used to the food stimuli. Females habituated more rapidly to food stimuli than males. The difference between sexes is discussed in view of two ultimate and one proximate reasons.
en-copyright=
kn-copyright=
en-aut-name=TanabeShintaro
en-aut-sei=Tanabe
en-aut-mei=Shintaro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KasuyaEiiti
en-aut-sei=Kasuya
en-aut-mei=Eiiti
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Department of Biology, Faculty of Sciences, Kyushu University
kn-affil=
affil-num=3
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
en-keyword=Habituation
kn-keyword=Habituation
en-keyword=Hyla japonica
kn-keyword=Hyla japonica
en-keyword=individual variation
kn-keyword=individual variation
en-keyword=sexual difference
kn-keyword=sexual difference
en-keyword=predation
kn-keyword=predation
END
start-ver=1.4
cd-journal=joma
no-vol=157
cd-vols=
no-issue=1
article-no=
start-page=17
end-page=31
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=201910
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Lines selected for different durations of tonic immobility have different leg lengths in the red flour beetle Tribolium castaneum
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Tonic immobility is an adaptive anti-predator behaviour observed in many species. This anti-predator behaviour is often correlated with a species' movement motivation, so a relationship between the duration of tonic immobility and morphological traits supporting movement would be expected. Using the red flour beetle, Tribolium castaneum, we carried out two-way artificial selection for the duration of tonic immobility over more than 43 generations, establishing populations with longer (L) and shorter (S) tonic immobility durations compared to those of a non-selected control (C) population. Here, we investigated differences in walking motivation and leg length between the selected populations. Walking motivation was significantly higher in beetles from the S population than that in those from the L population. Moreover, S-population beetles of both sexes had significantly longer legs than those from L and C populations. The present results suggest the evolution of longer legs in response to selection pressure for a shorter duration of tonic immobility in T. castaneum.
en-copyright=
kn-copyright=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
en-keyword=anti-predator strategy
kn-keyword=anti-predator strategy
en-keyword=tonic immobility
kn-keyword=tonic immobility
en-keyword=artificial selection
kn-keyword=artificial selection
en-keyword=leg
kn-keyword=leg
en-keyword=Tribolium castaneum
kn-keyword=Tribolium castaneum
END
start-ver=1.4
cd-journal=joma
no-vol=36
cd-vols=
no-issue=2
article-no=
start-page=161
end-page=168
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2018
dt-pub=20180404
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Responses to relaxed and reverse selection in strains artificially selected for duration of death-feigning behavior in the red flour beetle, Tribolium castaneum
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Divergent lines selected artificially for many generations make it possible to answer two questions: (1) whether genetic variation still exists within the selected population; and (2) whether the selection itself is costly for the selected strain. In previous studies, the red flour beetle Tribolium castaneum was divergently selected artificially for duration of death-feigning, and strains selected for longer (L-strain) and shorter (S-strain) durations of death-feigning have been established (Miyatake et al. 2004, 2008). Because the selection experiments have been conducted for more than 27 generations, genetic variation may be eroded. Furthermore, because another previous study reported physiological costs to L-strains, the L-strains selected artificially for longer duration of death-feigning may have suffered more costs than the S-strains. In the present study, therefore, we relaxed the selection pressure after the 27th or 30th generation of S- and L-strains. We also carried out reverse selection during the most recent eight generations of S- and L-strains. The results showed that each strain clearly responded to relaxation of selection and reverse selection, suggesting that (1) additive genetic variation still existed in both strains after long-term selection, and (2) selection for shorter and longer duration of death-feigning was costly. These results suggest that anti-predator behavior is controlled by many loci, and longer or shorter duration of death-feigning is costly in a laboratory without predators.
en-copyright=
kn-copyright=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Artificial selection
kn-keyword=Artificial selection
en-keyword=Quantitative trait
kn-keyword=Quantitative trait
en-keyword=Relaxation of selection
kn-keyword=Relaxation of selection
en-keyword=Reverse selection
kn-keyword=Reverse selection
en-keyword=Tonic immobility
kn-keyword=Tonic immobility
en-keyword=Tribolium castaneum
kn-keyword=Tribolium castaneum
END
start-ver=1.4
cd-journal=joma
no-vol=30
cd-vols=
no-issue=6
article-no=
start-page=1522
end-page=1529
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190705
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Artificial selection on walking distance suggests a mobility-sperm competitiveness trade-off
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Securing matings is a key determinant of fitness, and in many species, males are the sex that engages in mate searching. Searching for mates is often associated with increased mobility. This elevated investment in movement is predicted to trade-off with sperm competitiveness, but few studies have directly tested whether this trade-off occurs. Here, we assessed whether artificial selection on mobility affected sperm competitiveness and mating behavior, and if increased mobility was due to increased leg length in red flour beetles (Tribolium castaneum). We found that, in general, males selected for decreased mobility copulated for longer, stimulated females more during mating, and tended to be better sperm competitors. Surprisingly, they also had longer legs. However, how well males performed in sperm competition depended on females. Males with reduced mobility always copulated for longer than males with high mobility, but this only translated into greater fertilization success in females from control populations and not the selection populations (i.e. treatment females). These results are consistent with a mate-searching/mating-duration trade-off and broadly support a trade-off between mobility and sperm competitiveness.
en-copyright=
kn-copyright=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=ArcherC Ruth
en-aut-sei=Archer
en-aut-mei=C Ruth
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=Hosken David J
en-aut-sei=Hosken
en-aut-mei= David J
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=2
en-affil=Centre for Ecology & Conservation, University of Exeter
kn-affil=
affil-num=3
en-affil=Centre for Ecology & Conservation, University of Exeter
kn-affil=
affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=leg length
kn-keyword=leg length
en-keyword=mate searching
kn-keyword=mate searching
en-keyword=morphology
kn-keyword=morphology
en-keyword=sperm competition,
kn-keyword=sperm competition,
en-keyword=trade-off
kn-keyword=trade-off
en-keyword=Tribolium castaneum
kn-keyword=Tribolium castaneum
en-keyword=walking
kn-keyword=walking
END
start-ver=1.4
cd-journal=joma
no-vol=49
cd-vols=
no-issue=5
article-no=
start-page=478
end-page=483
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190621
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Arousal from Tonic Immobility by Vibration Stimulus
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Tonic immobility (TI) is an effective anti-predator strategy. However, long immobility status on the ground increases the risk of being eaten by predators, and thus insects must rouse themselves when appropriate stimulation is provided. Here, the strength of vibration causing arousal from the state of TI was examined in strains artificially selected for longer duration of TI (L-strains: long sleeper) in a beetle. We provided different strengths of vibration stimuli to the long sleepers in Tribolium castaneum. Although immobilized beetles were never awakened by the stimuli from 0.01 to 0.12 mm in amplitude, almost of the beetles were aroused from immobilized status by the stimulus at 0.21 mm. There was a difference in sensitivity of individuals when the stimuli of 0.14 mm and 0.18 mm were provided. F2 individuals were also bred by crossing experiments of the strains selected for shorter and longer duration of TI. The arousal sensitivity to vibration was well separated in the F2 individuals. A positive relationship was observed between the duration of TI and the vibration amplitude, suggesting that immobilized beetles are difficult to arouse from a deep sleep, while light sleepers are easily aroused by even small vibrations. The results indicate a genetic basis for sensitivity to arousal from TI.
en-copyright=
kn-copyright=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KitayamaRyota
en-aut-sei=Kitayama
en-aut-mei=Ryota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=OtsukiKeiichi
en-aut-sei=Otsuki
en-aut-mei=Keiichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=JiYuhao
en-aut-sei=Ji
en-aut-mei=Yuhao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=FujisawaRyusuke
en-aut-sei=Fujisawa
en-aut-mei=Ryusuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=NagayaNaohisa
en-aut-sei=Nagaya
en-aut-mei=Naohisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
affil-num=1
en-affil=Department of Evolutionary Ecology, Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=2
en-affil=Department of Evolutionary Ecology, Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=3
en-affil=Department of Evolutionary Ecology, Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=4
en-affil=Faculty of Computer Science and Engineering Kyoto Sangyo University
kn-affil=
affil-num=5
en-affil=Department of Evolutionary Ecology, Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=6
en-affil=School of Computer Science and Systems EngineeringKyushu Institute of Technology
kn-affil=
affil-num=7
en-affil=Faculty of Computer Science and Engineering Kyoto Sangyo University
kn-affil=
en-keyword=Beetle
kn-keyword=Beetle
en-keyword=Crossing experiment
kn-keyword=Crossing experiment
en-keyword=Death feigning
kn-keyword=Death feigning
en-keyword=Selection experiment
kn-keyword=Selection experiment
en-keyword=Thanatosis
kn-keyword=Thanatosis
en-keyword=Tribolium
kn-keyword=Tribolium
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=1
end-page=6
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190913
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of temperature during successive generations on life-history traits in a seed beetle Callosobruchus chinensis (Chrysomelidae: Coleoptera)
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Temperature is an important environmental factor for life-history traits in poikilothermic animals. Many of experiments on evolution have been conducted using Drosophila species, and effects on life-history traits vary depending on the study. On the other hand, few studies have been conducted on the effects of temperature on life-history traits in the other insect species. In the present study, we reared adzuki bean beetles under two different temperatures, high and low, for 2 years (20 generations), and compared life-history traits including body size of females, fecundity, egg size, rate of egg hatching, emergence rate, development time, and wing length. No differences in responses were found in these traits between selection strains, except the rate of egg hatching. That is, the rates of egg hatching in high-temperature (32 °C) selection strains were significantly higher than those in low-temperature (24 °C) selection strains. We discuss the cause of change in egg hatchability during successive generations under different temperature treatments from the following viewpoints including evolutionary adaptation to high temperature and the experimental protocol.
en-copyright=
kn-copyright=
en-aut-name=TeradaKenji
en-aut-sei=Terada
en-aut-mei=Kenji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
affil-num=1
en-affil=Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
affil-num=3
en-affil=Graduate School of Environmental and Life ScienceOkayama University
kn-affil=
en-keyword=Temperature
kn-keyword=Temperature
en-keyword=Experimental evolution
kn-keyword=Experimental evolution
en-keyword=Hatching rate Seed beetle
kn-keyword=Hatching rate Seed beetle
en-keyword=Callosobruchus chinensis
kn-keyword=Callosobruchus chinensis
END
start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=1
article-no=
start-page=14001
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190930
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Transcriptomic comparison between beetle strains selected for short and long durations of death feigning
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= The molecular basis of death feigning, an antipredator behavior that has received much attention recently, was analyzed. We compared the gene expression profiles of strains with different behaviors, i.e., different durations of death feigning, in the beetle Tribolium castaneum. Beetles artificially selected for short (S) and long (L) durations of death feigning for many generations were compared thoroughly by RNA sequencing. We identified 518 differentially expressed genes (DEGs) between the strains. The strains also showed divergence in unexpected gene expression regions. As expected from previous physiological studies, genes associated with the metabolic pathways of tyrosine, a precursor of dopamine, were differentially expressed between the S and L strains; these enzyme-encoding genes were expressed at higher levels in the L strain than in the S strain. We also found that several genes associated with insulin signaling were expressed at higher levels in the S strain than in the L strain. Quantitative real-time PCR analysis showed that the relative expression levels of Tchpd (encoding 4-hydroxyphenylpyruvate dioxygenase, Hpd) and Tcnat (encoding N-acetyltransferase, Nat) were significantly higher in the L strain than in the S strain, suggesting the influence of these enzymes on the supply of dopamine and duration of death feigning.
en-copyright=
kn-copyright=
en-aut-name=UchiyamaHironobu
en-aut-sei=Uchiyama
en-aut-mei=Hironobu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=SasakiKen
en-aut-sei=Sasaki
en-aut-mei=Ken
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=HinosawaShogo
en-aut-sei=Hinosawa
en-aut-mei=Shogo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=TanakaKeisuke
en-aut-sei=Tanaka
en-aut-mei=Keisuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=MatsumuraKentarou
en-aut-sei=Matsumura
en-aut-mei=Kentarou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=YajimaShunsuke
en-aut-sei=Yajima
en-aut-mei=Shunsuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
affil-num=1
en-affil=NODAI Genome Research Center, Tokyo University of Agriculture
kn-affil=
affil-num=2
en-affil=Graduate School of Agriculture, Tamagawa University
kn-affil=
affil-num=3
en-affil=Graduate School of Agriculture, Tamagawa University
kn-affil=
affil-num=4
en-affil=NODAI Genome Research Center, Tokyo University of Agriculture
kn-affil=
affil-num=5
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=6
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
affil-num=7
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
END
start-ver=1.4
cd-journal=joma
no-vol=8
cd-vols=
no-issue=12
article-no=
start-page=e83278
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2013
dt-pub=20131227
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Male Courtship Behavior and Weapon Trait as Indicators of Indirect Benefit in the Bean Bug, Riptortus pedestris
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Females prefer male traits that are associated with direct and/or indirect benefits to themselves. Male?male competition also drives evolution of male traits that represent competitive ability. Because female choice and male?male competition rarely act independently, exploring how these two mechanisms interact is necessary for integrative understanding of the evolution of sexually selected traits. Here, we focused on direct and indirect benefits to females from male attractiveness, courtship, and weapon characters in the armed bug Riptortus pedestris. The males use their hind legs to fight other males over territory and perform courtship displays for successful copulation. Females of R. pedestris receive no direct benefit from mating with attractive males. On the other hand, we found that male attractiveness, courtship rate, and weapon size were significantly heritable and that male attractiveness had positive genetic covariances with both courtship rate and weapon traits. Thus, females obtain indirect benefits from mating with attractive males by producing sons with high courtship success rates and high competitive ability. Moreover, it is evident that courtship rate and hind leg length act as evaluative cues of female choice. Therefore, female mate choice and male?male competition may facilitate each other in R. pedestris. This is consistent with current basic concepts of sexual selection.
en-copyright=
kn-copyright=
en-aut-name=SuzakiY?
en-aut-sei=Suzaki
en-aut-mei=Y?
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KatsukiMasako
en-aut-sei=Katsuki
en-aut-mei=Masako
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=OkadaYasukazu
en-aut-sei=Okada
en-aut-mei=Yasukazu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Graduate School of Environmental Science, Okayama University
affil-num=2
en-affil=
kn-affil=Faculty of Life and Environmental Science, University of Tsukuba
affil-num=3
en-affil=
kn-affil=Graduate School of Environmental and Life Science, Okayama University
affil-num=4
en-affil=
kn-affil=Department of General Systems Studies, University of Tokyo
END
start-ver=1.4
cd-journal=joma
no-vol=25
cd-vols=
no-issue=1
article-no=
start-page=49
end-page=55
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2007
dt-pub=20071001
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Interpopulation variation in female remating is attributable to female and male effects in Callosobruchus chinensis
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The evolution of female multiple mating is best understood by consideration of male and female reproductive perspectives. Females should usually be selected to remate at their optimum frequencies whereas males should be selected to manipulate female remating to their advantage. Female remating behavior may therefore be changed by variation of male and female traits. In this study, our objective was to separate the effects of female and male strains on female remating for the adzuki bean beetle, Callosobruchus chinensis, for which there is interstrain variation in female remating frequency. We found that interstrain variation in female remating is primarily attributable to female traits, suggesting genetic variation in female receptivity to remating in C. chinensis. Some interstrain variation in female remating propensity was attributable to an interaction between female and male strains, however, with the males of some strains being good at inducing nonreceptivity in females from one high-remating strain whereas others were good at inducing copulation in nonvirgin females from the high-remating strain. There is, therefore, interstrain variation in male ability to deter females from remating and in male ability to mate successfully with nonvirgin females. These results suggest that mating traits have evolved along different trajectories in different strains of C. chinensis.
en-copyright=
kn-copyright=
en-aut-name=HaranoTomohiro
en-aut-sei=Harano
en-aut-mei=Tomohiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil=Okayama University
kn-affil=
affil-num=2
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=
en-keyword=polyandry
kn-keyword=polyandry
en-keyword=multiple mating
kn-keyword=multiple mating
en-keyword=sexual conflict
kn-keyword=sexual conflict
en-keyword=sexual selection
kn-keyword=sexual selection
en-keyword=genetic variation
kn-keyword=genetic variation
en-keyword=Callosobruchus chinensis
kn-keyword=Callosobruchus chinensis
END
start-ver=1.4
cd-journal=joma
no-vol=25
cd-vols=
no-issue=3
article-no=
start-page=255
end-page=261
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2007
dt-pub=20071001
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Ownership-dependent mating tactics of minor males of the beetle Librodor japonicus (Nitidulidae) with intra-sexual dimorphism of mandibles
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Intra-sexual dimorphism is found in the weapons of many male beetles. Different behavioral tactics to access females between major and minor males, which adopt fighting and alternative tactics, respectively, are thought to maintain the male dimorphism. In these species major males have enlarged weapons that they use in fights with rival males. Minor males also have small weapons in some of these species, and it is unclear why these males possess weapons. We examined the hypothesis that minor males might adopt a fighting tactic when their status was relatively high in comparison with that of other males (e.g., ownership of a territory). We observed the behavioral tactics of major and minor males of the beetle Librodor japonicus, whose males have a dimorphism of their mandibles. Major males fought for resources, whereas minor males adopted two status-dependent tactics, fighting and sneaking, to access females, depending on their ownership of a sap site. We suggest that ownership status-dependent mating tactics in minor males may maintain the intra-sexual dimorphism in this beetle.
en-copyright=
kn-copyright=
en-aut-name=OkadaKensuke
en-aut-sei=Okada
en-aut-mei=Kensuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil=
kn-affil=Okayama University
affil-num=2
en-affil=
kn-affil=
en-keyword=allometry
kn-keyword=allometry
en-keyword=alternative phenotype
kn-keyword=alternative phenotype
en-keyword=exaggerated trait
kn-keyword=exaggerated trait
en-keyword=male competition
kn-keyword=male competition
en-keyword=status-dependent selection
kn-keyword=status-dependent selection
END
start-ver=1.4
cd-journal=joma
no-vol=91
cd-vols=
no-issue=1
article-no=
start-page=61
end-page=69
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=200202
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Genetic Quality Control in Mass-Reared Melon Files
kn-title=大量増殖されたウリミバエの遺伝的虫質管理
en-subtitle=
kn-subtitle=
en-abstract=ウリミバエ根絶後の大量増殖における虫質管理について，人為選択実験の結果に基づいて考察した．まずミバエ類の大量増殖における虫質管理の簡単な歴史について触れた．沖縄県で現在飼育されている大量増殖虫は，野生虫と比べて多くの形質が異なっている．そこで現在飼育されている大量増殖虫の特質を明らかにし，なぜそのような違いが生じたのかについて考えた．その結果，形質の変化には大量増殖方法による選択圧が大きく関与していると考えられた．そこで，大量増殖虫のいくつかの形質に対する人為選択実験の結果をレビューした．さらに，大量増殖虫の繁殖と寿命に関わる形質を人為的に操作することに成功した沖縄県の事例を紹介した．以上の結果をふまえて，ウリミバエ根絶後の大量増殖における虫質管理の方向性について考察した．
kn-abstract=Quality control in mass-reared melon files, Bactricera cucurbitae, after eradication is discussed, based on the results of artificial selection experiments. First, a brief history of quality control in mass-rearing of insects is described. In practical mass-rearing of melon fly, many traits habe already been differentiated between mass-reared and wild files. These differing traits are reviewed and the factors which caused these differences are considered. It was considered that the differences between wild and mass-reared melon files depended on the selection pressures from the mass-rearing method. Next, the results of several artificial selection experiments using the melon fly are reviewed. Finally, consideration is given to some correlated responses to artificial selection in mass-rearing. Longevity that is correlated to early fecundity was successfully controlled by artificial selection for reproduction in the mass-rearing system. On the basis of these results, an improved method for quality control in mass-reared melon fly with considerations for quantitative genetics is discussed.
en-copyright=
kn-copyright=
en-aut-name=MiyatakeTakahisa
en-aut-sei=Miyatake
en-aut-mei=Takahisa
kn-aut-name=宮竹貴久
kn-aut-sei=宮竹
kn-aut-mei=貴久
aut-affil-num=1
ORCID=
affil-num=1
en-affil=
kn-affil=岡山大学
en-keyword=Bactrocera cucurbitae
kn-keyword=Bactrocera cucurbitae
en-keyword=eradication
kn-keyword=eradication
en-keyword=genetic correlation
kn-keyword=genetic correlation
en-keyword=mass-rearing
kn-keyword=mass-rearing
en-keyword=selection
kn-keyword=selection
END