Faculty Profiles - TAKAKURA Koichi

Papers - TAKAKURA Koichi

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Unionid freshwater mussels in irrigation ditches are affected by physical environmental factors and proximity to paddy fields Reviewed International journal

Nakano, M., T. Yamamoto, K.-I. Takakura, M. Urabe

Zoological Science 32 ( 4 ) 378 - 382 2015.8

Sexual shape dimorphism accelerated by male–male competition, but not prevented by sex-indiscriminate parental care in dung beetles (Scarabaeidae) Reviewed International journal

Shigeki Kishi,Koh-Ichi Takakura,Takayoshi Nishida

Ecology and Evolution 5 2754 - 2761 2015.7

Island biogeography as a test of reproductive interference Reviewed International journal

http://link.springer.com/article/10.1007%2Fs10144-015-0489-y

Population Ecology 57 307 - 309 2015.7

Conflicting intersexual mate choices maintain interspecific sexual interactions Reviewed International journal

Koh-Ichi Takakura, Takayoshi Nishida, Keisuke Iwao

Population Ecology 57 ( 2 ) 261 - 271 2015.7

Host specialization by reproductive interference between closely related herbivorous insects Reviewed International journal

Takayoshi Nishida,Kohichi Takakura,Keisuke Iwao

Population Ecology 57 ( 2 ) 273 - 281 2015.7

Evaluation of seed banks for restoration of wetland vegetation: an integrated assessment of the seedling establishment and direct counting methods based on a Bayesian model Reviewed

Bulletin of Kansai Organization for Nature Conservation 37 ( 1 ) 47 - 59 2015.6

Reproductive Interference between the native and the alien dandelion (Taraxacum) in Izu, Japan Reviewed

15 ( 1 ) 41 - 50 2015.5

Conflicting intersexual mate choices maintain interspecific sexual interactions Reviewed

57 ( 2 ) 261 - 271 2015.4

Host specialization by reproductive interference between closely related herbivorous insects Reviewed

57 ( 2 ) 273 - 281 2015.4

Island biogeography as a test of reproductive interference Reviewed

57 ( 2 ) 307 - 319 2015.4

Associations between Co-Detected Respiratory Viruses in Children with Acute Respiratory Infections Reviewed

67 ( 6 ) 469 - 475 2014.11

Impacts of environmental factors in rice paddy fields on abundance of the mud snail (Cipangopaludina chinensis laeta) Reviewed

80 460 - 463 2014.11

Distribution of Capnocytophaga canimorsus in dogs and cats with genetic characterization of isolates Reviewed

171 ( 1-2 ) 153 - 159 2014.6

Pollen–pistil interactions in reproductive interference: comparisons of heterospecific pollen tube growth from alien species between two native Taraxacum species Reviewed

Nishida S, MM Kanaoka, K Hashimoto, KI Takakura, T Nishida

Functional Ecology 28 450 - 457 2014.4

Pollen-pistil interactions in reproductive interference: comparisons of heterospecific pollen tube growth from alien species between two native Taraxacum species Reviewed

Sachiko Nishida, Masahiro M. Kanaoka, Keisuke Hashimoto, Koh-Ichi Takakura, Takayoshi Nishida

FUNCTIONAL ECOLOGY 28 ( 2 ) 450 - 457 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

1. Reproductive interference (RI), any negative interspecific interaction during the reproductive process, has been gaining increasing attention due to its potential explanatory power for the mutually exclusive distribution of closely related species. RI in plants may occur during any of three stages: pollen transfer, pollen-pistil interactions or hybridization. Pollen-pistil interactions may be especially important as most studies of RI have suggested the involvement at this stage. Details of these interactions are required to fully explore RI and are especially relevant in considering the impact of RI in the field.
2. We present a plausible explanation of how RI functions in the pollen-pistil interaction stage using two Japanese native dandelions, Taraxacum japonicum and Taraxacum longeappendiculatum, of which only the former is vulnerable to RI from an alien congener, Taraxacum officinale. We conducted a series of hand pollinations in these native dandelions and compared pollen tube behaviour to examine differences associated with vulnerability and imperviousness to RI from the alien.
3. The two native dandelions differed in terms of the absence/presence of pollen tube elongation after heterospecific pollination (pollination with only T. officinale): pollen tubes grew through the ovaries of the vulnerable T. japonicum, but not through those of the impervious T. longeappendiculatum. In vitro hand pollination verified that the alien pollen tubes could extend into the ovaries of T. japonicum.
4. Our results show that RI from the alien dandelion consumed ovules by heterospecific pollen deposition. The pistils of the impervious native species could prevent growth of the alien pollen tubes, thereby sparing the ovules for fertilization by conspecific pollen. The pistils of the vulnerable species lacked interspecific incompatibility against the alien, and thus, the alien pollen tube entered the ovary, eliminating an opportunity for conspecific pollen fertilization. This consumption of ovules by heterospecific pollen tubes would cause a seed set failure, leading to reduced abundance and a further exertion of RI in the next generation, which explains displacement of the vulnerable species by the alien in the field.

DOI： 10.1111/1365-2435.12165

Web of Science

Impacts of environmental factors in rice paddy fields on abundance of the mud snail (Cipangopaludina chinensis laeta) Reviewed

Kosuke Nakanishi, Koh-Ichi Takakura, Ryosuke Kanai, Kota Tawa, Daisuke Murakami, Hiroichi Sawada

Journal of Molluscan Studies 80 460 - 463 2014

Frequent respiratory viral infections in a young child in a 27-month follow-up study Reviewed

Atsushi Kaida, Hideyuki Kubo, Nobuhiro Iritani, Seiji P. Yamamoto, Atsushi Hase, Koh-Ichi Takakura, Tsutomu Kageyema

JMM Case Reports in press 2014

Reproductive population dynamics of the Far Eastern Catfish, Silurus asotus estimated from mark and recapture and Bayesian modeling Reviewed

TAKAKURA Koh-ichi

Funao, T., K.I. Takakura, T. Nishida, H. Sawada 61 ( 1 ) 15 - 26 2014

Biofilm Formation and Resistance to Benzalkonium Chloride in Listeria monocytogenes Isolated from a Fish Processing Plant Reviewed

Hiromi Nakamura, Koh-Ichi Takakura, Yoshiaki Sone, Yasuyuki Itano, Yoshikazu Nishikawa

JOURNAL OF FOOD PROTECTION 76 ( 7 ) 1179 - 1186 2013.7

Language：English Publishing type：Research paper (scientific journal) Publisher：INT ASSOC FOOD PROTECTION

Listeria monocytogenes is a foodborne pathogen that causes the potentially life-threatening illness listeriosis. Previously, a few clones of L. monocytogenes persisting in a cold-smoked fish processing plant were isolated from the plant's products continuously. To evaluate the role of biofilms in the persistence of L. monocytogenes strains specific to this plant, the abilities of the persistent strain (PS) and transient strain (TS) of L. monocytogenes found in this plant to form biofilms were compared, as was resistance to the sanitizing effects of benzalkonium chloride (BC). The PS produced more biofilm than the TS in 48 h. The half-maximal effective concentration (EC50), the BC concentration at which the ATP bioluminescence of each bacterial strain decreased by 50% relative to its maximum activity, was about 150-fdld higher in the PS than in the TS. In contrast, when these values were measured in organisms in a planktonic state, the EC50 of the PS was only 2.2-fold higher than that of the TS. Extracellular polymeric substances (EPS) were extracted from biofilms, and the glucose content of these biofilms was determined with the phenol sulfuric acid method to estimate the quantity of EPS. The total amount of EPS in the PS biofilm was higher than that in the TS biofilm. These findings suggest that the PS produces greater amounts of biofilm and EPS than the TS, which results in greater resistance of the PS to disinfectants. The persistence of the strain in the fish processing plant might he attributable to these properties.

DOI： 10.4315/0362-028X.JFP-12-225

Web of Science

Analyses and predictions of the presence and reproduction of three water birds at ponds in Osaka Prefecture with consideration of spatial auto-correlation Reviewed

Koh-ichi Takakura, Takayuki Nishio, Masaaki Kitano

ORNITHOLOGICAL SCIENCE 12 ( 1 ) 15 - 26 2013.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ORNITHOLOGICAL SOC JAPAN, UNIV TOKYO, SCH AGR

We analyzed existing records of the presence and breeding of three water bird species (Little Grebe Tachybaptus ruficollis; Common Moorhen Gallinula chloropus; and Spot-billed Duck Anas zonorhyncha) at 1,087 ponds in Osaka Prefecture to estimate the effects on them of various environmental, geographical, and social factors. A conditional autoregressive (CAR) model, incorporating spatial structure as a random effect, was applied in the analyses. Results show a significant positive effect of a broad shape of the water surface, which indicates the importance of threats by terrestrial enemies, on the probability of the presence of each species. Two human social factors affected the probability of breeding of two bird species: human population density negatively affected the breeding probability of T ruficollis and A. zonorhyncha; and the retail store density, an index of development as a commercial area, positively affected the latter species. Spatial random effects reflecting unmeasured factors were large and comparable to other measured factors. Different patterns were exhibited among the three species, demonstrating that other important factors were overlooked and that these effects should be assessed by application of methods such as the CAR model.

DOI： 10.2326/osj.12.15

Web of Science

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Papers - TAKAKURA Koichi