Faculty Profiles - TAKAKURA Koichi

Papers - TAKAKURA Koichi

Division display21 - 40 of about 115／ All the affair displays >>

Reproductive interference between two serious pests, oriental fruit flies Bactrocera carambolae and B. dorsalis (Diptera: Tephritidae), with very wide but partially overlapping host ranges Reviewed

Kitano D., Fujii N., Sujiono, Yamaue S., Kitamura T., Honma A., Tsukada M., Nishida T., Sawada H., Takakura K.

Applied Entomology and Zoology 53 ( 4 ) 525 - 533 2018.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Applied Entomology and Zoology

© 2018, The Japanese Society of Applied Entomology and Zoology. Bactrocera carambolae and B. dorsalis (Diptera: Tephritidae) are extremely destructive pests of fruits and vegetables in the Asia-Pacific region. Earlier reports have described that B. carambolae and B. dorsalis, respectively, use mainly star fruit and mango, suggesting a certain level of host partitioning which can be ascribed neither to differences in larval food qualities nor host-specific parasitoid mortality. This study specifically examined reproductive interference (antagonistic sexual interaction) between B. carambolae and B. dorsalis as a potential factor strongly affecting their host partitioning. We observed mating behaviors, especially interspecific courtships and mating, by cohabiting the conspecific and heterospecific pairs together. Consequently, we quantified their effects on the reproductive success of females. Males of both species frequently courted their own females, but they also courted females of other species. Courtship refusal by females was not selective in males of either species. This incomplete discrimination of both sexes led to frequent occurrences of interspecific sexual interactions in both species, but only B. carambolae females showed reduced reproductive success. These results suggest that B. dorsalis, superior in reproductive interference, can occupy high-quality mango, whereas B. carambolae, inferior in reproductive interference, must use low-quality star fruit.

DOI： 10.1007/s13355-018-0584-6

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055291404&origin=inward

Does simultaneous and sympatric reproduction between two native spined loaches lead to reproductive interference and local extinction? Reviewed

Morii K., Nakano M., Takakura K.

Environmental Biology of Fishes 101 ( 9 ) 1407 - 1416 2018.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Biology of Fishes

© 2018, Springer Nature B.V. Reproductive interference occurs when fitness of females of one species decreases because of misdirected courtship behaviors by males of another species. Reproductive interference strongly excludes either species in the interaction but it does not persist for long on an evolutionary time scale. Therefore, reproductive interference between a pair of co-evolved native species is difficult to observe because exclusion ends the interaction even if even the potential for reproductive interference still exists. However, anthropogenic environmental changes can bring about secondary contact between two species and trigger reproductive interference, leading to local species extinction. We demonstrated this phenomenon with two native spined loaches: Cobitis magnostriata (Cmag) and C. minamorii oumiensis (Cmio). In 2015 and 2016, we investigated the spatiotemporal dynamics of adults and juveniles of both species to estimate the effects of the relative abundance of adults on reproductive success. Additionally, we surveyed the distribution of juveniles and investigated the proportion of gravid females which failed to reproduce at the end of the spawning season. In 2016, Cmio juveniles were fewer than in 2015, although the abundances of Cmio adults were similarly low in both years and the Cmag adults were more abundant in 2016 than in 2015. The juveniles of the two species exhibited similar spatiotemporal dynamics. At the end of the spawning season, Cmag males were abundant and most Cmio females failed to reproduce. These results suggest that the two species share spawning habitats and seasons and that Cmag males exert reproductive interference on Cmio females. This report is the first of a study suggesting that anthropogenic environmental changes triggered reproductive interference between native species in the field.

DOI： 10.1007/s10641-018-0787-2

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049225577&origin=inward

Does simultaneous and sympatric reproduction between two native spined loaches lead to reproductive interference and local extinction? Reviewed

101 ( 9 ) 1407 - 1416 2018.9

Skewed male reproductive success and pollen transfer in a small fragmented population of the heterodichogamous tree Machilus thunbergii Reviewed

Watanabe S., Takakura K., Kaneko Y., Noma N., Nishida T.

Journal of Plant Research 131 ( 4 ) 623 - 631 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Plant Research

© 2018, The Botanical Society of Japan and Springer Japan KK, part of Springer Nature. Heterodichogamy is defined as the presence of two flower morphs that exhibit the male and female functions at different times among individuals within a population. Heterodichogamy is regarded as an adaptation to promote outcrossing through enhanced inter-morph mating, together with a 1:1 morph ratio. However, in highly fragmented populations, the morph ratio may be more likely to be biased by stochastic events. In such a situation, individuals of a minority morph within a population are expected to have higher reproductive success than those of a majority morph, which may suffer from pollen shortages of the minority morph. In this paper, we evaluated mating patterns and male reproductive success in a highly fragmented population of Machilus thunbergii, a putative heterodichogamous evergreen laurel tree. Results of paternity analysis indicated that the selfing rate was not clearly different between the two morphs. In contrast, the proportion of intra-morph mating was higher in the majority-morph (MM) mother trees than in the minority-morph (MF) mother trees. Bayesian estimated male reproductive success indicated that male reproductive success was higher in minority-morph (MF) than in majority-morph (MM) mother trees. These findings indicate that (1) the majority morph mothers, suffering a shortage of the opposite morph pollen, could partly compensate for the reduced reproductive success by intra-morph mating rather than by selfing, and (2) negative-frequency dependent selection may be involved in the maintenance of the two morphs.

DOI： 10.1007/s10265-018-1018-9

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85042234864&origin=inward

Age class structure of spawning populations of two endangered endemic striated spined loaches in Lake Biwa river system. Reviewed

Morii K, Takakura KI

Japanese Journal of Environmental Entomology and Zoology 29 ( 4 ) 135 - 141 2018

Growth patterns of juveniles observed at a shared spawning site in two closely related species of spined loaches endemic to the Lake Biwa riverine system; Cobitis magnostriata and C. minamorii oumiensis Reviewed

Morii K,Nakano M, Nishida T, Takakura KI

Japanese Journal of Environmental Entomology and Zoology 2018

Unionid mussel composition and ditch environments in floodplain and alluvial fan geomorphic types: a case study of a Lake Biwa river basin Reviewed

18 ( 1 ) 41 - 49 2017.1

A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification Reviewed International journal

Ichihara M., A. Yamamoto, M. Sudo, K.I. Takakura

Environmental Science and Pollution Research 24 ( 3 ) 2667 - 2674 2017

滋賀県彦根市の水田地帯に生息するカヤネズミの食性分析－糞DNA分析からの推定 Reviewed

畠　佐代子・高倉耕一

環動昆 28 121 - 131 2017

琵琶湖につながる小規模水域におけるオオクチバスMicropterus salmoides小型個体の性成熟 Reviewed

北野大輔・曽我部共生・佐竹祐亮・高倉耕一

保全生態学研究 22 345 - 349 2017

Variation of clutch size and trophic egg proportion in a ladybird with and without male-killing bacterial infection Reviewed

30 ( 6 ) 1081 - 1095 2016.12

Spatial Distribution of Flower Color Induced by Interspecific Sexual Interaction Reviewed

Takahashi Yuma, Takakura Koh-ichi, Kawata Masakado

PLOS ONE 11 ( 10 ) 2016.10

Estimation of population size of endangered plant, Arabidopsis kamchatica ssp. kawasakiana Reviewed

Kosugi, A, K.-I. Takakura, N. Noma, A. Kawabe, E. Harada

38 ( 1 ) 51 - 60 2016.6

A comparison of host utilization between sibling fruit flies Bactrocera carambolae and B. papayae (Diptera: Tephritidae) in west Java, Indonesia, serious quarantine pest of fruits Reviewed

Japanese Journal of Environmental Entomology and Zoology 26 ( 4 ) 133 - 141 2016.1

Note on the invasion period of Atractomorpha sinensis (Orthoptera: Pyrgomorphidae) in Osaka, central Japan Reviewed

Kazuo Yamazaki, Koh-Ichi Takakura, Chobei Imai

Japanese journal of environmental entomology and zoology 27 ( 1 ) 17 - 20 2016

Effectiveness of common pill woodlouse, Armadillidium vulgare, as a weed control agent Reviewed

Koh-Ichi Takkaura

Japanese journal of environmental entomology and zoology 27 ( 3 ) 81 - 87 2016

Variation in the strength of reproductive interference from an alien congener to a native species in Taraxacum Reviewed International journal

Nishida S, K. Hashimoto, M. Kanaoka, K.-I. Takakura and T. Nishida

Journal of Plant Research 130 125 - 134 2016

大阪市の犬・猫・ネズミにおけるジフテリア毒素産生性Corynebacterium ulcerans の保有状況と分離株の性状 Reviewed

Umeda, K. R. Hatakeyama, T. Abe, K.-I. Takakura, T. Komiya, M. Iwaki, A. Yamamoto, H. Sanada

Journal of the Japan Veterinary Medical Association 68 ( 12 ) 765 - 769 2015.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Veterinary Medical Association

We examined the distribution of Corynebacterium ulcerans in dogs, cats and rats in Osaka city. C. ulcerans was detected in five of 137 cats (3.6 %), but not in the dogs and rats examined. The five cats from which C. ulcerans was isolated showed poor physical condition. The five isolates from the positive cats produced diphtheria toxin and showed biochemically identical, common antibiotic susceptibility patterns, genotypes for pulsed-field gel electrophoresis and ribotyping. These results indicated the possibility that genetically identical or closely related C. ulcerans is widely distributed among cats in Osaka city.

DOI： 10.12935/jvma.68.765

CiNii Books

Other Link： https://jlc.jst.go.jp/DN/JLC/20019687702?from=CiNii

Flower color polymorphism maintained by overdominant selection in Sisyrinchium sp. Reviewed

128 ( 6 ) 933 - 939 2015.11

Flower color polymorphism maintained by overdominant selection in Sisyrinchium sp. Reviewed International journal

Yuma Takahashi , Koh-ichi Takakura, Masakado Kawata

Journal of Plant Research 128 ( 6 ) 933 - 939 2015.9

　 PREV - NEXT 　

<TAKAKURA Koichi>

Papers - TAKAKURA Koichi