168 Works

Data from: The evolution of canaliculate rudists in the light of a new canaliculate polyconitid rudist from the Albian of the Central Pacific

Shin-Ichi Sano, Yasuhiro Iba, Peter W. Skelton, Jean-Pierre Masse, Yolanda M. Aguilar & Tomoki Kase
A new polyconitid rudist, Magallanesia canaliculata gen. et sp. nov., of probably late Albian age, is described from the Pulangbato area, central Cebu Island, the Philippines in the western Central Pacific and Takuyo Daini Seamount, now located in the Northwest Pacific. It is similar to Praecaprotina Yabe and Nagao, 1926, a Japanese – Central Pacific endemic genus of late Aptian – early Albian age, but differs in having canals that developed by partitioning of the...

Data from: The consequences of demand-driven seed provisioning for sexual differences in reproductive investment in Thalictrum occidentale (Ranunculaceae)

Takashi Y. Ida, Lawrence D. Harder & Gaku Kudo
Many iteroparous angiosperms may benefit from flexible annual resource allocation in response to variable reproductive opportunities induced by external conditions. If maximal reproductive investment is fixed, lack of reproductive sinks would cause resource redistribution to other sinks. Alternatively, reproductive investment may vary depending on the demand of reproductive sinks, changing source-sink relations. In particular, differential responses by males and females to the demands of flower and seed production may cause sexual dimorphism. We assess the...

Data from: Hypoperfusion of the adventitial vasa vasorum develops an abdominal aortic aneurysm

Hiroki Tanaka, Nobuhiro Zaima, Takeshi Sasaki, Masaki Sano, Naoto Yamamoto, Takaaki Saito, Kazunori Inuzuka, Takahiro Hayasaka, Naoko Goto-Inoue, Yuki Sugiura, Kohji Sato, Hirona Kugo, Tatsuya Moriyama, Hiroyuki Konno, Mitsutoshi Setou & Naoki Unno
The aortic wall is perfused by the adventitial vasa vasorum (VV). Tissue hypoxia has previously been observed as a manifestation of enlarged abdominal aortic aneurysms (AAAs). We sought to determine whether hypoperfusion of the adventitial VV could develop AAAs. We created a novel animal model of adventitial VV hypoperfusion with a combination of a polyurethane catheter insertion and a suture ligation of the infrarenal abdominal aorta in rats. VV hypoperfusion caused tissue hypoxia and developed...

Data from: The distribution of cool spots as microrefugia in a mountainous area

Ayuma Shimokawabe, Yuichi Yamaura, Takumi Akasaka, Tomonori Sato, Yuichiro Shida, Satoshi Yamanaka & Futoshi Nakamura
It has recently been proposed that microrefugia played an important role in species survival during past climate change events. However, the current distributions of microrefugia remain largely unknown. Wind-hole sites are areas affected by preferential flows of cool air generated in interstitial spaces created by rock fragments or colluvia. Alpine plant species occurring in lowland wind-hole sites isolated from alpine zones may be relicts of the last glacial period. Hokkaido, northern Japan, is known to...

Elevational range-sizes and edaphic associations for plant species of the Mount Kinabalu region of Borneo (Sabah, Malaysia)

Melissa Whitman, Reed S. Beaman, Rimi Repin, Shin-Ichiro Aiba, Kanehiro Kitayama & Sabrina E. Russo
Identifying physical and ecological boundaries that limit where species can occur is important for predicting how those species will respond to global change. The island of Borneo encompasses a wide range of habitats that support some of the highest richness on Earth, making it an ideal location for investigating ecological mechanisms underlying broad patterns of species distribution. We tested variation in richness and range-size in relation to edaphic specialization and vegetation zone boundaries using 3060...

Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

Nathan P. Havill, Shigehiko Shiyake, Ashley Lamb Galloway, Robert G. Foottit, Guoyue Yu, Annnie Paradis, Joseph Elkinton, Michael E. Montgomery, Masakazu Sano, Adalgisa Caccone & Annie Paradis
Hemlock woolly adelgid, Adelges tsugae, is an invasive pest of hemlock trees (Tsuga) in eastern North America. We used 14 microsatellites and mitochondrial COI sequences to assess its worldwide genetic structure and reconstruct its colonization history. The resulting information about its life cycle, biogeography and host specialization could help predict invasion by insect herbivores. We identified eight endemic lineages of hemlock adelgids in central China, western China, Ulleung Island (South Korea), western North America, and...

Data from: Adaptive phenotypic variation among clonal ant workers

Eisuke Hasegawa, Saori Watanabe, Yuuka Murakami & Fuminori Ito
Phenotypic variations are observed in most organisms, but their significance is not always known. The phenotypic variations observed in social insects are exceptions. Genetically based response threshold variances have been identified among workers and are thought to play several important adaptive roles in social life, e.g. allocating tasks among workers according to demand, promoting the sustainability of the colony and forming the basis of rationality in collective decision-making. Several parthenogenetic ants produce clonal workers and...

Data from: Female-female competition leads to female-biased sex allocation and dimorphism in brood sex composition in a gall-forming aphid

Xin Tong, Shinichi Akimoto & Shin-Ichi Akimoto
1. Sex allocation in animals is predicted to be skewed from a 1:1 ratio if sons and daughters yield different marginal fitness returns per unit maternal investment. 2. We tested this prediction using the gall-forming aphid Tetraneura sorini, in which lethal fighting is common among females, whereas male-male competition is moderate. Mothers (autumnal winged females) parthenogenetically produce females and males in their abdomen and can control their sizes and numbers. The females and males do...

Data from: Predator size divergence depends on community context

Yutaka Okuzaki & Teiji Sota
Body size is a multi-functional trait related to various fitness components, but the relative importance of different selection pressures are seldom resolved. In Carabus japonicus beetles, of which the larvae exclusively prey on earthworms, adult body size is related to the presence/absence of a larger congener and habitat temperature. In sympatry, C. japonicus consistently exhibits smaller body size which is effective for avoiding interspecific mating, but in allopatry, it shows size variation unrelated to temperature....

Data from: Suffering in receivers: negative effects of noise persist regardless of experience in female anurans

Masayuki Senzaki, Taku Kadoya, Clinton D. Francis, Nobuo Ishiyama & Futoshi Nakamura
1. Anthropogenic noise is widespread, and growing evidence suggests that it can negatively affect animals through many different mechanisms including masking of cues and signals, distraction, and aversion to noise. 2. Acoustic masking has received the most attention from researchers and recent evidence suggests that masking effects can be mitigated by alteration of signal frequencies or amplitudes by signalers. Additionally, alteration can be a learned response via prior experience with noise exposure. However, it remains...

Data from: Individual differences are consistent across changes in mating status and mediated by biogenic amines

Nicholas DiRienzo & Hitoshi Aonuma
Although aspects of an individual’s state are well-known to influence the expression of behavior, it is still unclear how elements of state affect consistent among-individual differences in behavior. With binary, irreversible elements of state, such as mating status, there may be optimal behavioral phenotypes before and after mating, with individuals often prioritizing mate acquisition before and resource acquisition after. Yet, limited plasticity may prevent optimal behavior in both contexts. Additionally, it remains largely unknown if...

Data from: Form–function relationships in a marine foundation species depend on scale: a shoot to global perspective from a distributed ecological experiment

Jennifer L. Ruesink, John J. Stachowicz, Pamela L. Reynolds, Christoffer Boström, Mathieu Cusson, James Douglass, Johan Eklöf, Aschwin H. Engelen, Masakazu Hori, Kevin Hovel, Katrin Iken, Per-Olav Moksnes, Masahiro Nakaoka, Mary I. O'Connor, Jeanine L. Olsen, Erik E. Sotka, Matthew A. Whalen & Emmett J. Duffy
Form-function relationships in plants underlie their ecosystem roles in supporting higher trophic levels through primary production, detrital pathways, and habitat provision. For widespread, phenotypically-variable plants, productivity may differ not only across abiotic conditions, but also from distinct morphological or demographic traits. A single foundation species, eelgrass (Zostera marina), typically dominates north temperate seagrass meadows, which we studied across 14 sites spanning 32-61° N latitude and two ocean basins. Body size varied by nearly two orders...

Data from: Winter warming effects on tundra shrub performance are species-specific and dependent on spring conditions

Eveline J. Krab, Jonas Rönnefarth, Marina Becher, Gesche Blume-Werry, Frida Keuper, Jonatan Klaminder, Juergen Kreyling, Kobayashi Makoto, Ann Milbau, Ellen Dorrepaal & Jonas Roennefarth
1. Climate change driven increases in winter temperatures positively affect conditions for shrub growth in arctic tundra by decreasing plant frost damage and stimulation of nutrient availability. However, the extent to which shrubs may benefit from these conditions may be strongly dependent on the following spring climate. Species-specific differences in phenology and spring frost sensitivity likely affect shrub growth responses to warming. Additionally, effects of changes in winter and spring climate may differ over small...

Data from: Song performance is a condition-dependent dynamic trait honestly indicating the quality of paternal care in the Bull-headed Shrike

Yuusuke Nishida & Masaoki Takagi
The good parent hypothesis in sexual selection predicts that if females can increase their fitness by mating with males who provide high-quality parental care, then female preferences for male phenotypes honestly indicating the quality of paternal care will evolve. In order to test this hypothesis, we investigated correlations between male song, the timing of pair formation of males, male feeding rate, and reproductive success, in the Bull-headed Shrike Lanius bucephalus (an altricial oscine passerine with...

Venus Climate Orbiter Akatsuki LIR Longitude-Latitude Map Data

Shin-ya Murakami, Kazunori Ogohara, Masahiro Takagi, Hiroki Kashimura, Manabu Yamada, Toru Kouyama, Takeshi Horinouchi & Takeshi Imamura
This dataset contains longitude-latitude map data created from images acquired by the LIR instrument of the Venus Climate Orbiter (VCO, also known as PLANET-C and AKATSUKI) spacecraft. This dataset consists of NetCDF and FITS files. The longitude-latitude map data are included as Level 3 product in NetCDF. During process of creating longitude-latitude map data, pointing of spacecraft was corrected using limb-fitting technique. Detected limb points and information on fitted ellipse are provided as auxiliary data,...

Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids

Jun Matsubayashi, Yutaka Osada, Kazuaki Tadokoro, Yoshiyuki Abe, Atsushi Yamaguchi, Kotaro Shirai, Kentaro Honda, Chisato Yoshikawa, Nanako Ogawa, Naohiko Ohkouchi, Naoto Ishikawa, Toshi Nagata, Hiroomi Miyamoto, Shigeto Nishino & Ichiro Tayasu
The long-distance migrations by marine fishes are difficult to track by field observation. Here, we propose a new method to track such migrations using stable nitrogen isotopic composition at the base of the food web (δ15NBase), which allows for direct comparison of isotope ratios between proxy organisms of the isoscape and the target migratory animal. We initially constructed a δ15NBase isoscape in the North Pacific by bulk and compound-specific isotope analyses of copepods (n =...

Data from: Evaluating the existence and benefit of major histocompatibility complex-based mate choice in an isolated owl population

Akira Sawada, Haruko Ando & Masaoki Takagi
How mate preferences evolve in the first place has been a major conundrum for sexual selection. Some hypotheses explaining this assume fitness benefit derived from subsequent generations. Major Histocompatibility Complex (MHC)-based mate choice is a representative example of the mate choice that is associated with such trans-generational mechanisms. To provide evidences for fitness benefit of MHC-based mate choice, previous studies assessed the association between own MHC genotype and own fitness components. However, the association between...

Different effects of mating group size as male and as female on sex allocation in a simultaneous hermaphrodite

Masami Tamechika, Kohei Matsuno, Satoshi Wada & Yoichi Yusa
Sex allocation theory predicts that the optimal sexual resource allocation of simultaneous hermaphrodites is affected by mating group size (MGS). Although the original concept assumes that the MGS does not differ between male and female functions, the MGS in the male function (MGSm; i.e., the number of sperm recipients the focal individual can deliver its sperm to plus one) and that in the female function (MGSf; the number of sperm donors plus one) do not...

Data from: Contribution of small isolated habitats in creating refuges from biological invasions along a geomorphological gradient of floodplain waterbodies

Nobuo Ishiyama, Kazuki Miura, Satoshi Yamanaka, Junjiro Negishi & Futoshi Nakamura
1. Habitat fragmentation, which involves habitat size reduction and isolation, is a major cause of biodiversity decline. However, interest in small isolated habitats has increased among ecosystem managers because these fragments can serve as remnant refuges for unique and/or endangered species in human-altered landscapes. 2. In a fragmented floodplain of northern Japan, we demonstrate how habitat fragmentation and habitat quality shape the refuges for a unique endangered minnow (Rhynchocypris percnurus sachalinensis) from biological invasions. We...

Quantifying the impacts of 166 years of land cover change on lowland bird communities

Munehiro Kitazawa, Yuichi Yamaura, Masayuki Senzaki, Masashi Hanioka, Haruka Ohashi, Michio Oguro, Tetsuya Matsui & Futoshi Nakamura
Land cover change for agriculture is thought to be a major threat to global biodiversity. However, its ecological impact has rarely been quantified in the Northern Hemisphere, as broad-scale conversion to farmland mainly occurred until the 1400s-1700s in the region, limiting the availability of sufficient data. The Ishikari Lowland in Hokkaido, Japan offers an excellent opportunity to address this issue, as hunter–gatherer lifestyles dominated in this region until the mid-19th century and land cover maps...

Data from: Early snowmelt by an extreme warm event affects understory more than overstory trees in Japanese temperate forests

Kobayashi Makoto
We conducted a warming experiment (four 20 m by 20 m plots) in temperate forests of Japan to determine the effects of earlier snowmelt on both understory dwarf bamboo plants and overstory birch trees. Our experimental treatment advanced snowmelt by about 10 days and increased soil temperatures that were associated with increased rates of soil nitrogen (N) mineralization and nitrification. Furthermore, these changes led to lower C:N ratios of leaves together with the greater growth...

Additional file 6 of Immuno-digital invasive cleavage assay for analyzing Alzheimer’s amyloid ß-bound extracellular vesicles

Kohei Yuyama, Hui Sun, Yasuyuki Igarashi, Kenji Monde, Takumi Hirase, Masato Nakayama & Yoichi Makino
Additional file 6: Supplementary Table 1. Raw data of Fig. 4d.

Nitrogen isotope ratios of nitrate, ammonium, and amino acids in sinking particles in the Northwestern North Pacific

Chisato Yoshikawa, Nanako O. Ogawa, Yoshito Chikaraishi, Akiko Makabe, Yohei Matsui, Yoshikazu Sasai, Masahide Wakita, Makio C. Honda, Yoshihisa Mino, Maki N. Aita, Tetsuichi Fujiki, Takuro Nunoura, Naomi Harada & Naohiko Ohkouchi
The database includes sample information and nitrogen isotope measurements of nitrate, ammonium, and amino acids in sinking particles in the Northwestern North Pacific. The sinking particles were collected in sediment traps moored at depths of 200, 500, and 4,810 m at station K2 (47°N, 160°E; water depth, ~5,200 m). The seawater was sampled with a plastic bucket for the surface and Niskin-X sampling bottles for water below the surface at stations K2 and KNOT (44°N,...

Data from: The selective advantage of a mast-flowering behavior in Veratrum album subsp. oxysepalum: Implications of the predator satiation hypothesis

Yohei Ito & Gaku Kudo
Premise: The synchronous highly variable flower or seed production among years within a population– i.e., masting – has been reported in numerous perennial plants. Although ecological advantages of masting are recognized as the enhancement of pollination efficiency and/or escape from predator attack, little is known about the degree of these advantages and the variation in masting behavior among populations of conspecific plants. Methods: We observed flowering ramet density and reproductive success (fruit-set success and herbivorous...

Additional file 1 of Go To Travel campaign and the geographic spread of COVID-19 in Japan

Asami Anzai, Sung-mok Jung & Hiroshi Nishiura
Additional file 1. Number of prefectures that exceeded the threshold number of cases per 100,000 persons.

Registration Year

  • 2022
    29
  • 2021
    24
  • 2020
    24
  • 2019
    15
  • 2018
    15
  • 2017
    17
  • 2016
    12
  • 2015
    16
  • 2014
    7
  • 2013
    7

Resource Types

  • Dataset
    168

Affiliations

  • Hokkaido University
    168
  • University of Tokyo
    18
  • Kyoto University
    17
  • Forestry and Forest Products Research Institute
    8
  • Kyushu University
    7
  • Chiba Institute of Technology
    6
  • National Institute of Advanced Industrial Science and Technology
    6
  • University of British Columbia
    6
  • Japan Agency for Marine-Earth Science and Technology
    5
  • Kitasato University
    4