研究者詳細 - 高倉　耕一

論文 - 高倉　耕一

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

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年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

その他リンク： 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? 査読

Morii K., Nakano M., Takakura K.

Environmental Biology of Fishes 101 ( 9 ) 1407 - 1416 2018年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

その他リンク： 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? 査読

101 ( 9 ) 1407 - 1416 2018年9月

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

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

Journal of Plant Research 131 ( 4 ) 623 - 631 2018年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

その他リンク： 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. 査読

Morii K, Takakura KI

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

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 査読

Morii K,Nakano M, Nishida T, Takakura KI

Japanese Journal of Environmental Entomology and Zoology 2018年

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

18 ( 1 ) 41 - 49 2017年1月

A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification 査読国際誌

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

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

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小型個体の性成熟査読

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年

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分析からの推定査読

畠　佐代子・高倉耕一

環動昆 28 121 - 131 2017年

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

30 ( 6 ) 1081 - 1095 2016年12月

Spatial Distribution of Flower Color Induced by Interspecific Sexual Interaction 査読

Takahashi Yuma, Takakura Koh-ichi, Kawata Masakado

PLOS ONE 11 ( 10 ) 2016年10月

絶滅危惧種タチスズシロソウ（Arabidopsis kamchatica ssp. kawasakiana）個体群の個体数推定査読

小杉亜希, 高倉耕一, 野間直彦, 河邊昭, 原田英美子

地域自然史と保全 38 ( 1 ) 51 - 60 2016年6月

検疫害虫ミバエ類の同属近縁種Bactrocera carambolaeとB. papayaeの原産地インドネシア・ジャワ島における寄主利用の比較査読

藤井暢之, Sujiono, 龍洋, 日高直哉, 高倉耕一, 本間淳, 塚田森生, 沢田裕一, 西田隆義

環動昆 26 ( 4 ) 133 - 141 2016年1月

大阪港湾部におけるアカハネオンブバッタの侵入時期について査読

山崎　一夫, 高倉　耕一, 今井　長兵衛

環動昆 27 ( 1 ) 17 - 20 2016年

雑草防除用生物資材としてのオカダンゴムシArmadillidium vulgareの有効性査読

高倉　耕一

環動昆 27 ( 3 ) 81 - 87 2016年

Variation in the strength of reproductive interference from an alien congener to a native species in Taraxacum 査読国際誌

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

Journal of Plant Research 130 125 - 134 2016年

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査読

梅田薫, 畠山理沙, 阿部拓人, 高倉耕一, 小宮貴子, 岩城正昭, 山本明彦, 真田秀一

日本獣医師会雑誌 68 ( 12 ) 765 - 769 2015年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Japan Veterinary Medical Association

大阪市動物管理センターに収容された犬，猫及び同市内で捕獲したネズミのジフテリア毒素産生性コリネバクテリウム・ウルセランス（Corynebacterium ulcerans）保有状況を調査した．猫137頭中5頭（3.6％）から本菌が分離されたが，犬125頭，ネズミ29匹からは分離されなかった．これらの保菌猫は，すべて健康状態の悪化した猫であった．猫から分離された5株はすべてジフテリア毒素産生性を有し，生化学性状，薬剤感受性パターン，Pulsed-field gel electrophoresis電気泳動及びRibotypingによる遺伝学的性状は一致していた．これらより，大阪市内の猫には遺伝的に同一あるいは近縁なC. ulceransが分布していることが示された．

DOI： 10.12935/jvma.68.765

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JLC/20019687702?from=CiNii

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

128 ( 6 ) 933 - 939 2015年11月

Flower color polymorphism maintained by overdominant selection in Sisyrinchium sp. 査読国際誌

Yuma Takahashi , Koh-ichi Takakura, Masakado Kawata

Journal of Plant Research 128 ( 6 ) 933 - 939 2015年9月

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論文 - 高倉　耕一