論文 - 傳田　哲郎

Floral traits of mammal-pollinated Mucuna macrocarpa (Fabaceae): Implications for generalist-like pollination systems.

Kobayashi S, Denda T, Liao CC, Lin YH, Wu SH, Izawa M

Ecology and Evolution ( International Journal of Business Innovation and Research )  8 ( 16 ) 8607 - 8615   2018年08月

掲載種別: 研究論文（学術雑誌）

関連する研究費コード: 25·114. 16H05771

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Flowering habit and pollination of Alpinia zerumbet (Zingiberaceae) in the Ryukyu and Daito Islands.

Denda T, Kobayashi S, Izawa M

Biological Magazine Okinawa ( 沖縄生物学会 )  56   11 - 26   2018年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

関連する研究費コード: 22570095

南大東島におけるシロオビキホリハナバチ (ハキリバチ科) の初記録

福川優希，傳田哲郎

Fauna Ryukyuana   41   11 - 13   2018年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Dietary habits of the endangered Okinawa Rail

Kobayashi Shun, Naruse Tohru, Nakamura Yasuyuki, Denda Tetsuo, Izawa Masako, Morita Yuya, Nakaya Yumiko, Nagamine Takashi, Onuma Manabu, Okano Tsukasa, Haga Atsushi, Yamamoto Ichihito, Higa Mizuki

ORNITHOLOGICAL SCIENCE ( 日本鳥学会 )  17 ( 1 ) 19 - 35   2018年

掲載種別: 研究論文（学術雑誌）

　概要を見る

Many species of flightless rail are endemic to small islands and endangered, or have become extinct during historical times. However, our understanding of their basic ecological knowledge remains limited. The Okinawa Rail <i>Hypotaenidia okinawae</i> is a flightless species of rail endemic to Okinawajima Island in the Ryukyu Archipelago, Japan. In this study we have quantified the dietary components of the Okinawa Rail using gizzard contents classified by the frequency of occurrence and wet weight. The Okinawa Rail feeds on a wide variety of animals and plants throughout the year, but the frequency of occurrence and wet weight of animal matter significantly exceeds those of plant matter. The number of items present in the gizzard did not differ among seasons, ages and between sexes. Grit was present in almost all individuals and the wet weight did not differ between sexes or among age groups. Although the diet was observed to be diverse, the primary dietary component of both sexes, all ages, and throughout the year appears to be land snails, indicating their great significance as a source of food.

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Squirrel pollination of Mucuna macrocarpa (Fabaceae) in Taiwan.

Kobayashi S, Denda T, Liao C-C, Wu S-H, Lin Y-H, Izawa M

Journal of Mammalogy ( Journal of Mammalogy )  98 ( 2 ) 533 - 541   2017年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Explosive opening is an important process for pollination of Mucuna flowers. It is generally triggered by an animal pollinator specific to each Mucuna species. Although Mucuna macrocarpa has been reported to be pollinated by a nectar-eating bat, the distributional ranges of this plant and that of the nectar-eating bats do not overlap completely. Previous research suggested that this plant could be pollinated by other species depending on the region. In Taiwan, where nectar-eating bats are absent, 2 species of squirrels (Callosciurus erythraeus and Tamiops maritimus) and masked palm civets (Paguma larvata) were recorded as explosive openers. Of these 3 species, C. erythraeus was the most frequent and successful visitor-it opened the flowers in the same manner as nectar-eating bats. The other 2 species successfully opened only a few flowers and were therefore less effective pollinators. However, these opened flowers were subsequently visited by several insects, suggesting that the actions of the mammalian pollinators might have contributed to pollen transfer. Our data indicate that explosive openers of M. macrocarpa are not highly specialized and vary among the regions depending on the local fauna. Hence, this species, characterized by the explosive opening mechanism, is pollinated by different mammal species and insects in different regions.

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Population dynamics and the effects of temperature on the eggs of the seawater-dispersed stick insect Megacrania tsudai (Phasmida: Phasmatidae)

Kobayashi S, Usui R, Nomoto K, Ushirokita M, Deda T, Izawa M

Zoological Studies ( Zoological Studies )  55   1 - 10   2016年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Although the stick insect Megacrania tsudai cannot fly, its eggs are dispersed by seawater, which allows the species to distribute itself widely via the ocean. The life history of this non-volant insect that establishes settlements by egg dispersal remains poorly understood. We aimed to clarify the population dynamics and effects of temperature on the eggs of M. tsudai through field observation in near the northern limits of the distribution and laboratory experiments. In the wild, all instars appeared over a period of several months, with a larger proportion of first instars emerging from December to March, and a greater number of adults being observed from June to August. Laboratory experiments showed that the hatching rate of M. tsudai was not different between conditions of 25 and 30 degrees C, whereas it was significantly lower at 20 degrees C. The egg-development period was shorter when eggs were maintained under high temperature conditions, and longer for eggs kept at 20 degrees C. The effective cumulative temperature was estimated as 1561.5-2000.0 degrees C, and the developmental zero was estimated as 12.2-13.9 degrees C. The peak appearance of the first instar in the laboratory, which was used to obtain an estimate for the effective cumulative temperature and peak appearance of adults in the wild, was not entirely accurate because the peak appearance of the first instars in the wild was not consistently observed when the estimation indicated that they should appear. Megacrania tsudai is a univoltine near the northern limit of its distribution, and temperature has a strong effect on its egg development. Our estimation of population dynamics by laboratory experiments did not exactly predict what was observed in the field and it may be controlled by other factors. However, our findings indicate that the limiting factor of the distribution of this species is likely the effect of temperature on egg hatching.

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特定外来生物セイヨウオオマルハナバチの沖縄県における初記録

傳田哲郎，佐々木健志，小林峻，伊澤雅子

Fauna Ryukyuana   29   1 - 4   2016年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

琉球列島固有種アカボシタツナミソウ（シソ科）の渓流環境への適応と葉形変異.

吉村光，北村嘉夫，知花昌紀，横田昌嗣，傳田哲郎

沖縄生物学会誌   54   1 - 15   2016年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

隱藏在草海桐果實與花中的秘密 (クサトベラの果実と花に隠された秘密).

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林業研究専訊誌   22 ( 6 ) 22 - 28   2015年12月

掲載種別: 研究論文（その他学術会議資料等）

Fruit colour conceals endocarp dimorphism from avian seed dispersers in a tropical beach plant, Scaevola taccada (Goodeniaceae), found in Okinawa

Tanaka K, Denda T, Ueda K, Emura N

Journal of Tropical Ecology ( Journal of Tropical Ecology )  31 ( 4 ) 335 - 344   2015年07月

掲載種別: 研究論文（学術雑誌）

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南大東島におけるノネコ等による野生動物の被害実態

仲地学, 金城道男, 中谷裕美子, 岩崎哲也, 中岡香奈, 中西啄実, 大沼学, 岡野司, 羽賀敦, 伊澤雅子, 阿部悠, 小林峻, 傳田哲郎, 東和明, 山城須賀子, 金城貴也, 長嶺隆

沖縄生物学会誌   ( 53 ) 111 - 112   2015年03月

掲載種別: 研究論文（その他学術会議資料等）

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Phylogeny and biogeography of the Viola iwagawae-tashiroi species complex (Violaceae, section Plagiostigma) endemic to the Ryukyu Archipelago, Japan

Nakamura K.

Plant Systematics and Evolution ( Plant Systematics and Evolution )  301 ( 1 ) 337 - 351   2015年01月

掲載種別: 研究論文（学術雑誌）

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カマエカズラ（マメ科）の送粉パートナーとしてのニホンザルの獲得：拡大造林政策の間接的影響

小林 峻, 伊澤 雅子, 傳田 哲郎, 真柴 茂彦, 土肥 昭夫, 岩本 俊孝

霊長類研究 ( 日本霊長類学会 )  31 ( 1 ) 39 - 47   2015年

掲載種別: 研究論文（学術雑誌）

　概要を見る

<i>Mucuna macrocarpa</i> (Fabaceae) is a vine plant that is distributed mainly in tropical and subtropical areas, as well as in a limited region around a village in Kamae within Kyushu, Japan, although no seeds were observed in this region until the late 1970s. This species requires a pollination partner for seed setting, which was recently found to be the Japanese macaque (<i>Macaca fuscata</i>) in Kamae. We hypothesized that the recent seed setting observed is related to the change in the distribution of the Japanese macaque in recent years as a result of the afforestation policy introduced in the 1950s-1960s. The changes in afforestation activity, distribution of the Japanese macaque, and human population dynamics were investigated. Interviews with villagers revealed that Japanese macaques had seldom appeared in or near the village until the 1960s, but have frequently been observed within the village since the 1970s-1980s, which corresponds to the same period of time when the appearance of <i>M. macrocarpa</i> seeds was first noted. Depopulation and the decrease in farmers and foresters that occurred at the same time as afforestation might have enabled macaques to enter and settle in the village. One reason for the 10-year time lag between the first appearance of Japanese macaques and afforestation could be that the macaques only began to move out of the forest once the conifer forest had grown to a certain level. These results suggest that the afforestation caused a change in the distribution of Japanese macaques, allowing them to exploit <i>M. macrocarpa</i> flowers as a new food item. Consequently, afforestation might have indirectly caused seed setting of <i>M. macrocarpa</i> in Kamae.

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Karyological observations on dwarf individuals of Pilea brevicornuta Hayata (Urticaceae) growing in the riparian habitat in Amami-Oshima of the Ryukyus, Japan

Ferdousee Nure, Denda Tetsuo, Yokota Masatsugu

Chromosome Science ( 財団法人 染色体学会 )  18 ( 1 ) 3 - 8   2015年

掲載種別: 研究論文（学術雑誌）

　概要を見る

Cytotaxonomical studies were conducted on <i>Pilea brevicornuta</i> Hayata in the Ryukyu Islands and Taiwan. Karyomorphology of dwarf and creeping individuals growing in riparian habitat of Amami-Oshima Island, which is morphologically distinct from normal individu-als growing in forest floor, is the main focus of this re -port. All of the studied individuals of <i>P. brevicornuta</i> including dwarf ones had same chromosome number of <i>2n</i> = 24. The karyotype formula is <i>2n</i> = 24 = 6m + 13sm + 5st for normal individual and <i>2n</i> = 24 = 6m + 12sm + 6st for dwarf individual. The chromosomes of <i>P. brevicornuta</i> were all small with sizes varying between 0.9 and 3.0 μm. Considering the basic chromosome number in the genus <i>Pilea</i>, <i>2n</i> = 24 is regarded as diploid based on <i>x</i> = 12. Despite the high variability in morphology, <i>P. brevicornuta</i> had remarkably uniform karyomorphology.

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Pollination partners of Mucuna macrocarpa (Fabaceae) at the northern limit of its range

Kobayashi S, Denda T, Mashiba S, Iwamoto T, Doi T, Izawa M

Plant Species Biology ( Plant Species Biology )  30 ( 4 ) 272 - 278   2014年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Does egg dispersal occur via the ocean in the stick insect Megacrania tsudai (Phasmida: Phasmatidae)?

Kobayashi S, Usui R, Nomoto K, Ushirokita M, Denda T, Izawa M

Ecological Research   29 ( 6 ) 1025 - 1032   2014年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Dimorphism of the seed-dispersing organ in a pantropical coastal plant, Scaevola taccada: Heterogeneous population structures across islands.

Emura N, Denda T, Sakai M, Ueda K

Ecological Research   29 ( 4 ) 733 - 740   2014年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Development of microsatellite markers for the coastal shrub Scaevola taccada (Goodeniaceae).

Ando H, Emura N, Denda T, Nakahama N, Inoue-Murayama M, Isagi Y

Applications in Plant Science   2 ( 5 ) 1300094   2014年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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大分県蒲江で発見されたミヤコジシバリ（キク科）の記録.

合田雅浩，入本敦史，奥田康浩，横田昌嗣，傳田哲郎

沖縄生物学会誌 ( 沖縄生物学会 )  52   39 - 44   2014年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

ノグチゲラSapheopipo noguchii（キツツキ科）によるウジルカンダMucuna macrocarpa（マメ科）の盗蜜.

小林峻，傳田哲郎，伊澤雅子

野外鳥類学論文集 ( 日本野鳥の会 )  30   135 - 140   2014年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）